Traditional unidirectional cold expansion technology usually generates non-uniform distribution of residual stress in the thickness direction of holes, which is harmful to the improvement of fatigue life of holes. The present work proposed a bi-directional cold expansion procedure to realize the homogenization of residual stress in the thickness direction of the cold expanded hole, thereby further improved anti-fatigue performance of cold expanded hole. For this aim, a series of finite element (FE) simulations were carried out to investigate the effectiveness of the bi-directional cold expansion procedure and optimize the process parameters. The results showed that the optimized bi-directional cold expansion process generated a more uniform distribution of residual circumferential compressive stress in the thickness direction comparing to the simplified bi-directional cold expansion process using a single mandrel. For the Aluminium alloy 7050-T7451, when the first interference level I1=1.8%, the largest and the most uniform residual circumferential compressive stress was achieved, which suggested the best anti-fatigue performance.
{"title":"Study On the Residual Stress Distribution of Bi-directional Cold Expansion Process Performed On Open Holes","authors":"Wuzhu Yan, Yaowei Wang, Shujing Liang, S. Huo","doi":"10.1115/1.4062179","DOIUrl":"https://doi.org/10.1115/1.4062179","url":null,"abstract":"\u0000 Traditional unidirectional cold expansion technology usually generates non-uniform distribution of residual stress in the thickness direction of holes, which is harmful to the improvement of fatigue life of holes. The present work proposed a bi-directional cold expansion procedure to realize the homogenization of residual stress in the thickness direction of the cold expanded hole, thereby further improved anti-fatigue performance of cold expanded hole. For this aim, a series of finite element (FE) simulations were carried out to investigate the effectiveness of the bi-directional cold expansion procedure and optimize the process parameters. The results showed that the optimized bi-directional cold expansion process generated a more uniform distribution of residual circumferential compressive stress in the thickness direction comparing to the simplified bi-directional cold expansion process using a single mandrel. For the Aluminium alloy 7050-T7451, when the first interference level I1=1.8%, the largest and the most uniform residual circumferential compressive stress was achieved, which suggested the best anti-fatigue performance.","PeriodicalId":50080,"journal":{"name":"Journal of Pressure Vessel Technology-Transactions of the Asme","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2023-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"63503877","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pipeline vibration induced by fluid flow can cause pipeline fatigue damage, which seriously endangers the safety of the operation. This paper aims to clarify the dynamic variation law of pipeline vibration induced by gas-liquid two-phase flow in the elbow and the influence of different gas-liquid ratios on the dynamic evolution of two-phase flow patterns. The volume of Fluid (VOF) method and C-C algorithm capture the flow pattern characteristics and reconstruct the flow pattern phase space respectively, further exploring the complex information of dynamic flow pattern evolution. The chaotic characteristics of each flow pattern are analyzed according to the maximum Lyapunov exponent. The vibration characteristic mechanism corresponding to the evolution of the flow pattern is explored based on the time and frequency domain, and the origin exciting force of the elbow is explored according to the momentum balance equation. The simulation results show that the VOF method can well capture the characteristics of slug flow developed by the interphase instability mechanism. After phase space reconstruction, the dynamic evolution mechanism of the flow pattern is complex and the chaotic characteristics of slug flow are strong. The flow pattern evolution is related to the increase in wave height. The superficial velocity of the liquid phase is more sensitive to the flow pattern formation mechanism than the gas phas'e. The amplitude of the wave strongly depends on the Vsg and Vsl. There is a strong correlation between the main exciting force pulsation and momentum flux pulsation.
{"title":"Research On Mechanism of Dynamic Evolution Vibration Characteristics of Horizontal 90° Elbow Flow Pattern","authors":"Ze-jun Liang, Chun-yu Guo, Chun Yang","doi":"10.1115/1.4062152","DOIUrl":"https://doi.org/10.1115/1.4062152","url":null,"abstract":"\u0000 Pipeline vibration induced by fluid flow can cause pipeline fatigue damage, which seriously endangers the safety of the operation. This paper aims to clarify the dynamic variation law of pipeline vibration induced by gas-liquid two-phase flow in the elbow and the influence of different gas-liquid ratios on the dynamic evolution of two-phase flow patterns. The volume of Fluid (VOF) method and C-C algorithm capture the flow pattern characteristics and reconstruct the flow pattern phase space respectively, further exploring the complex information of dynamic flow pattern evolution. The chaotic characteristics of each flow pattern are analyzed according to the maximum Lyapunov exponent. The vibration characteristic mechanism corresponding to the evolution of the flow pattern is explored based on the time and frequency domain, and the origin exciting force of the elbow is explored according to the momentum balance equation. The simulation results show that the VOF method can well capture the characteristics of slug flow developed by the interphase instability mechanism. After phase space reconstruction, the dynamic evolution mechanism of the flow pattern is complex and the chaotic characteristics of slug flow are strong. The flow pattern evolution is related to the increase in wave height. The superficial velocity of the liquid phase is more sensitive to the flow pattern formation mechanism than the gas phas'e. The amplitude of the wave strongly depends on the Vsg and Vsl. There is a strong correlation between the main exciting force pulsation and momentum flux pulsation.","PeriodicalId":50080,"journal":{"name":"Journal of Pressure Vessel Technology-Transactions of the Asme","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2023-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45375812","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The nonlinear static and dynamic deflection/stress characteristics of the porous FG shell panel with various geometrical shapes subjected to thermomechanical load are studied in the present article. The nonlinear flexural and stress responses are computed using the FE-based mathematical model developed using higher-order shear deformation theory (HSDT). The large-deformation induced geometric nonlinearity is incorporated using Green-Lagrange nonlinear strains (GLNS). Voigt's micromechanical model, in association with power-law (GT-I), sigmoid (GT-II) and exponential (GT-III) kinds of material grading patterns, are utilized to evaluate the effective properties of the graded panel. Also, even (PRT-I) and uneven (PRT-II) porosity distributions are considered in the present work. The temperature-dependent (TD) properties are adopted in association with variable temperature fields, i.e. uniform (TD-I), linear (TD-II) and nonlinear (TD-III) for the computation of flexural responses. The direct iterative method is used to evaluate the desired nonlinear responses. The stability of the computational model is verified using elemental sensitivity analysis. Also, the proposed model's accuracy is checked by comparing the present numerical results with the available published data and experimentally evaluated results. The experiment was carried out by fabricating a few natural fibre-reinforced linearly varying layerwise panels for the test run. Finally, the analysis is extended to examine the influence of several design-associated parameters on the nonlinear static and transient flexural and stress responses of the FG curved/flat panel considering thermal environmental conditions.
{"title":"Nonlinear Thermomechanical Static and Dynamic Responses of Bidirectional Porous Fg Shell Panels and Experimental Verifications","authors":"Prashik Malhari Ramteke, S. Panda","doi":"10.1115/1.4062154","DOIUrl":"https://doi.org/10.1115/1.4062154","url":null,"abstract":"\u0000 The nonlinear static and dynamic deflection/stress characteristics of the porous FG shell panel with various geometrical shapes subjected to thermomechanical load are studied in the present article. The nonlinear flexural and stress responses are computed using the FE-based mathematical model developed using higher-order shear deformation theory (HSDT). The large-deformation induced geometric nonlinearity is incorporated using Green-Lagrange nonlinear strains (GLNS). Voigt's micromechanical model, in association with power-law (GT-I), sigmoid (GT-II) and exponential (GT-III) kinds of material grading patterns, are utilized to evaluate the effective properties of the graded panel. Also, even (PRT-I) and uneven (PRT-II) porosity distributions are considered in the present work. The temperature-dependent (TD) properties are adopted in association with variable temperature fields, i.e. uniform (TD-I), linear (TD-II) and nonlinear (TD-III) for the computation of flexural responses. The direct iterative method is used to evaluate the desired nonlinear responses. The stability of the computational model is verified using elemental sensitivity analysis. Also, the proposed model's accuracy is checked by comparing the present numerical results with the available published data and experimentally evaluated results. The experiment was carried out by fabricating a few natural fibre-reinforced linearly varying layerwise panels for the test run. Finally, the analysis is extended to examine the influence of several design-associated parameters on the nonlinear static and transient flexural and stress responses of the FG curved/flat panel considering thermal environmental conditions.","PeriodicalId":50080,"journal":{"name":"Journal of Pressure Vessel Technology-Transactions of the Asme","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2023-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46170569","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Supercritical CO2 has been proposed as working fluid in various typology power plants, thanks to its potential higher efficiency and cost reduction with respect to well-known technology of steam cycles.However, the high operating temperature and pressure conditions pose significant concerns in terms of compatibility of the supercritical CO2 with the high temperature sections of the power block. Typically, to address this problem, samples of different materials are kept in contact with the supercritical CO2 in a pressure vessel in order to test experimentally the material compatibility. This research deals with sizing this innovative openable pressure vessel which must be able to withstand the high temperatures (700°C) and the pressures (100bar) typical of those power plants. Results obtained by analytical calculation and the finite element method are consistent. The results obtained with both methods are generalizable and applicable to each removable pressure vessel that must withstand 100 bar of pressure and a temperature of 700°C. Application field that is outside the ASME VIII div.1, standard usually used for the design of pressure vessels. It is important to underline that the use of a removable container allows to reduce the costs of compatibility tests since otherwise, after each test, the pressure vessel should be disposed of. In addition, this allows a reduction of the environmental impact due to the fact that the new container will not be disposed of after each use.
{"title":"Pressure Vessel Design for High Temperature and Pressure Testing on Supercritical Carbon Dioxide","authors":"Lorenza Putelli, L. Ghidini, L. Solazzi, P. Iora","doi":"10.1115/1.4062153","DOIUrl":"https://doi.org/10.1115/1.4062153","url":null,"abstract":"\u0000 Supercritical CO2 has been proposed as working fluid in various typology power plants, thanks to its potential higher efficiency and cost reduction with respect to well-known technology of steam cycles.However, the high operating temperature and pressure conditions pose significant concerns in terms of compatibility of the supercritical CO2 with the high temperature sections of the power block. Typically, to address this problem, samples of different materials are kept in contact with the supercritical CO2 in a pressure vessel in order to test experimentally the material compatibility. This research deals with sizing this innovative openable pressure vessel which must be able to withstand the high temperatures (700°C) and the pressures (100bar) typical of those power plants. Results obtained by analytical calculation and the finite element method are consistent. The results obtained with both methods are generalizable and applicable to each removable pressure vessel that must withstand 100 bar of pressure and a temperature of 700°C. Application field that is outside the ASME VIII div.1, standard usually used for the design of pressure vessels. It is important to underline that the use of a removable container allows to reduce the costs of compatibility tests since otherwise, after each test, the pressure vessel should be disposed of. In addition, this allows a reduction of the environmental impact due to the fact that the new container will not be disposed of after each use.","PeriodicalId":50080,"journal":{"name":"Journal of Pressure Vessel Technology-Transactions of the Asme","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2023-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41929448","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
This paper presents a theoretical method to solve the free vibration and transient responses of a rectangular plate-cavity system. The spectral collocation method was used to solve the resonant frequencies and corresponding mode shapes of rectangular plates based on Kirchhoff thin-plate and Mindlin-Reissner thick plate theories. A linear velocity potential function was employed to model the fluid pressure applied to the plate surface. Unlike in previous studies, it was not assumed that the wet-mode shapes were the same as the dry-mode ones. Rather, the wet modes were assumed to be the superposition of the dry modes; then, the resonant frequencies and corresponding mode shapes of the wet modes could be obtained by solving the equations of the coupled system by exploiting the orthogonality of dry modes. Using dry modes' orthogonality and superposition of the wet modes, the transient responses of the rectangular plate-cavity system under impact loading can be solved. A method for estimating the resonant frequencies of the coupled system is proposed based on parametric studies to determine the influence of the fluid properties and plate materials on resonant frequencies. As a result, the resonant frequencies and transient responses obtained from the proposed theoretical methods are in excellent agreement with those obtained finite element analysis.
{"title":"Theoretical Analysis of Free Vibration and Transient Response of Rectangular Plate-Cavity System Under Impact Loading","authors":"M. Ji, K. Inaba","doi":"10.1115/1.4062121","DOIUrl":"https://doi.org/10.1115/1.4062121","url":null,"abstract":"\u0000 This paper presents a theoretical method to solve the free vibration and transient responses of a rectangular plate-cavity system. The spectral collocation method was used to solve the resonant frequencies and corresponding mode shapes of rectangular plates based on Kirchhoff thin-plate and Mindlin-Reissner thick plate theories. A linear velocity potential function was employed to model the fluid pressure applied to the plate surface. Unlike in previous studies, it was not assumed that the wet-mode shapes were the same as the dry-mode ones. Rather, the wet modes were assumed to be the superposition of the dry modes; then, the resonant frequencies and corresponding mode shapes of the wet modes could be obtained by solving the equations of the coupled system by exploiting the orthogonality of dry modes. Using dry modes' orthogonality and superposition of the wet modes, the transient responses of the rectangular plate-cavity system under impact loading can be solved. A method for estimating the resonant frequencies of the coupled system is proposed based on parametric studies to determine the influence of the fluid properties and plate materials on resonant frequencies. As a result, the resonant frequencies and transient responses obtained from the proposed theoretical methods are in excellent agreement with those obtained finite element analysis.","PeriodicalId":50080,"journal":{"name":"Journal of Pressure Vessel Technology-Transactions of the Asme","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2023-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43954808","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Jing Yang, Kong Chenghai, Guan Jingchao, Zhao Wei, Xilu Zhao
This paper proposes an integral hydro-bulge forming (IHBF) method using a triangular patch polyhedron as the closed preform shell. When triangular flat parts are welded along the edges in sequence, triangular patch polyhedra are naturally formed. From the radius of the spherical pressure vessel, a design formula was derived to calculate the side lengths of the triangular flat plate parts. To verify the forming performance of the spherical pressure vessel using the IHBF method, the finite element method was carried out, and a stainless-steel spherical pressure vessel with a thickness of 1.0 mm and a diameter of approximately 500 mm was fabricated using the proposed IHBF method. As a result, the diameter forming error was 5.86%, the shape error expressed as roundness to diameter ratio was 0.48%, and the average plastic strain was 0.02, which was approximately 1/19 times of the forming limit strain of the material. The amount of springback after forming was approximately 0.7 mm, indicating that the amount of water required for IHBF was 5.90% of the volume of the spherical pressure vessel, while the required water pressure was less than 2.4 MPa. The process directly utilizes triangular flat plate parts, eliminating the need for molds to process closed preform shells resulting in a low average plastic strain during forming, thereby improving the quality of the formed spherical pressure vessels.
{"title":"Integral Hydro-Bulge Forming Method of Spherical Pressure Vessels Using a Triangle Patch Polyhedron","authors":"Jing Yang, Kong Chenghai, Guan Jingchao, Zhao Wei, Xilu Zhao","doi":"10.1115/1.4062120","DOIUrl":"https://doi.org/10.1115/1.4062120","url":null,"abstract":"\u0000 This paper proposes an integral hydro-bulge forming (IHBF) method using a triangular patch polyhedron as the closed preform shell. When triangular flat parts are welded along the edges in sequence, triangular patch polyhedra are naturally formed. From the radius of the spherical pressure vessel, a design formula was derived to calculate the side lengths of the triangular flat plate parts. To verify the forming performance of the spherical pressure vessel using the IHBF method, the finite element method was carried out, and a stainless-steel spherical pressure vessel with a thickness of 1.0 mm and a diameter of approximately 500 mm was fabricated using the proposed IHBF method. As a result, the diameter forming error was 5.86%, the shape error expressed as roundness to diameter ratio was 0.48%, and the average plastic strain was 0.02, which was approximately 1/19 times of the forming limit strain of the material. The amount of springback after forming was approximately 0.7 mm, indicating that the amount of water required for IHBF was 5.90% of the volume of the spherical pressure vessel, while the required water pressure was less than 2.4 MPa. The process directly utilizes triangular flat plate parts, eliminating the need for molds to process closed preform shells resulting in a low average plastic strain during forming, thereby improving the quality of the formed spherical pressure vessels.","PeriodicalId":50080,"journal":{"name":"Journal of Pressure Vessel Technology-Transactions of the Asme","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2023-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44081109","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The lightweight of liquefied natural gas(LNG) tanker can reduce transportation cost and improve transportation efficiency. However, in lightweight design, the random vibration analysis based on fluid-structure interaction(FSI) is difficult, which demands to be effectively solved by simplifying the finite element model and load. The vibration test and fluid-structure interaction modal numerical analysis of a tanker model were carried out respectively, and the results are in good agreement. Taking the DC18 LNG tanker as an example, the random vibration response analysis was carried out based on the fluid-structure interaction modal numerical analysis, and the random fatigue damage coefficient of the support region of the inner container was obtained, which was used as the benchmark for the model and load simplification. The finite element model of the LNG tanker was simplified by applying the equivalent liquid mass to the walls of the inner container in the form of density. It is found that when the equivalent liquid mass ratio is 40%, the random vibration response characteristics of the DC18 LNG tanker are close to the actual structure. In the static calculation of the simplified model, the stress response of the container support area is close to the actual structural when the equivalent road spectrum load is 0.95g vertical acceleration. In this case, the stress result and the overall damage coefficient equivalent to the actual structure can be obtained just by static calculation, which greatly simplifies the solution process.
{"title":"Random Fatigue Analysis of Cryogenic Liquid Tanker Under Road Spectrum Load and a Simplified Algorithm","authors":"Bingjun Gao, Tong Wang, Xinghua Fu, J. Dong, Xu Chen, Chu-lin Yu","doi":"10.1115/1.4062122","DOIUrl":"https://doi.org/10.1115/1.4062122","url":null,"abstract":"\u0000 The lightweight of liquefied natural gas(LNG) tanker can reduce transportation cost and improve transportation efficiency. However, in lightweight design, the random vibration analysis based on fluid-structure interaction(FSI) is difficult, which demands to be effectively solved by simplifying the finite element model and load. The vibration test and fluid-structure interaction modal numerical analysis of a tanker model were carried out respectively, and the results are in good agreement. Taking the DC18 LNG tanker as an example, the random vibration response analysis was carried out based on the fluid-structure interaction modal numerical analysis, and the random fatigue damage coefficient of the support region of the inner container was obtained, which was used as the benchmark for the model and load simplification. The finite element model of the LNG tanker was simplified by applying the equivalent liquid mass to the walls of the inner container in the form of density. It is found that when the equivalent liquid mass ratio is 40%, the random vibration response characteristics of the DC18 LNG tanker are close to the actual structure. In the static calculation of the simplified model, the stress response of the container support area is close to the actual structural when the equivalent road spectrum load is 0.95g vertical acceleration. In this case, the stress result and the overall damage coefficient equivalent to the actual structure can be obtained just by static calculation, which greatly simplifies the solution process.","PeriodicalId":50080,"journal":{"name":"Journal of Pressure Vessel Technology-Transactions of the Asme","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2023-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41270540","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Application of Printed Circuit Heat Exchangers (PCHEs) to very high-temperature reactors (VHTRs) requires mechanical performance assessment methodologies. The PCHE morphology consists of thousands of millimeter-scale channels, for enhanced thermal efficiency, enclosed in a meter-scale PCHE core. PCHE geometry under thermomechanical creep-fatigue transients results in multiaxial interactions between its different segments, such as channeled core, walls, and headers. These global-level interactions influence the local channel-level responses. Hence, developing a PCHE performance assessment methodology, following the ASME Code, Section III, Division 5 provisions, is a critical gap to be filled. There is no analysis or design methodology available in ASME Code to assess a PCHE for its global and local level performances under high temperature and pressure loadings. This paper critically evaluates a recently proposed two-step analysis technique to estimate global interactions and local channel level responses of PCHEs. In this novel analysis technique, the channeled PCHE core is replaced with orthotropic solid blocks of representative stiffness properties for the global thermomechanical analysis. Subsequent channel scale submodel analysis with detailed channel geometry, loading, and elastic-perfectly plastic material model estimates the local responses for PCHE performance assessment. This paper critically evaluates this novel technique for its effectiveness in PCHE performance assessment. Finite element (FE) models imitating various analysis issues are developed, and FE analysis results are scrutinized. An important outcome of this study is the validation of the novel two-step PCHE analysis technique for application to the performance assessment of PCHEs in VHTRs.
{"title":"Critical Evaluation of a Novel Analysis Technique for Assessment of Printed Circuit Heat Exchangers in High Temperature Nuclear Service","authors":"A. Shaw, Heramb P. Mahajan, T. Hassan","doi":"10.1115/1.4057061","DOIUrl":"https://doi.org/10.1115/1.4057061","url":null,"abstract":"\u0000 Application of Printed Circuit Heat Exchangers (PCHEs) to very high-temperature reactors (VHTRs) requires mechanical performance assessment methodologies. The PCHE morphology consists of thousands of millimeter-scale channels, for enhanced thermal efficiency, enclosed in a meter-scale PCHE core. PCHE geometry under thermomechanical creep-fatigue transients results in multiaxial interactions between its different segments, such as channeled core, walls, and headers. These global-level interactions influence the local channel-level responses. Hence, developing a PCHE performance assessment methodology, following the ASME Code, Section III, Division 5 provisions, is a critical gap to be filled. There is no analysis or design methodology available in ASME Code to assess a PCHE for its global and local level performances under high temperature and pressure loadings. This paper critically evaluates a recently proposed two-step analysis technique to estimate global interactions and local channel level responses of PCHEs. In this novel analysis technique, the channeled PCHE core is replaced with orthotropic solid blocks of representative stiffness properties for the global thermomechanical analysis. Subsequent channel scale submodel analysis with detailed channel geometry, loading, and elastic-perfectly plastic material model estimates the local responses for PCHE performance assessment. This paper critically evaluates this novel technique for its effectiveness in PCHE performance assessment. Finite element (FE) models imitating various analysis issues are developed, and FE analysis results are scrutinized. An important outcome of this study is the validation of the novel two-step PCHE analysis technique for application to the performance assessment of PCHEs in VHTRs.","PeriodicalId":50080,"journal":{"name":"Journal of Pressure Vessel Technology-Transactions of the Asme","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2023-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49594829","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The performance of a reciprocating pump-pipeline system is often limited by the fluid dynamic interaction between pump, pipeline and valves. In this paper, the fluid dynamic characteristics of a reciprocating pump-pipeline system are investigated via experiments and numerical analysis. A simple experimental platform consisting of a reciprocating pump, suction and discharge pipes and flow control valve are offered and the experimental tests under multi-working conditions are carried out to explore the fluid dynamic interaction of the reciprocating pump-pipeline system. Combined with theoretical analysis and CFD simulations, a dynamic model of the pump-pipeline system is presented with considering the fluid dynamic interaction effect of pump valves, plunger stroke and flow control valve. All of the predicted results coincide well with the experimental data, and the inherent mechanism and the feature of the fluid dynamic interaction are revealed by experiments and numerical analysis. It is shown that the fluid dynamic characteristics of pipeline significantly influence the lag of valve opening and the motion behaviors of pump valves. The discharge flow rate rises nonlinearly with the increase of plunger stroke and the leakage rate associated with the resistance of flow control valve. The pressure pulsation in discharge pipe is directly related to and markedly impacted by the control valve opening and the plunger stroke. However, the influence of the reservoir liquid-level on the system dynamic behavior is relatively slight. This work would give information for the optimum design and operation maintenance of reciprocating pump-pipeline system.
{"title":"Experimental and Numerical Research On Fluid Dynamic Interaction Effects of Reciprocating Pump-Pipeline System","authors":"Zhenjie Gu, Changqing Bai, Hong-yan Zhang","doi":"10.1115/1.4057059","DOIUrl":"https://doi.org/10.1115/1.4057059","url":null,"abstract":"\u0000 The performance of a reciprocating pump-pipeline system is often limited by the fluid dynamic interaction between pump, pipeline and valves. In this paper, the fluid dynamic characteristics of a reciprocating pump-pipeline system are investigated via experiments and numerical analysis. A simple experimental platform consisting of a reciprocating pump, suction and discharge pipes and flow control valve are offered and the experimental tests under multi-working conditions are carried out to explore the fluid dynamic interaction of the reciprocating pump-pipeline system. Combined with theoretical analysis and CFD simulations, a dynamic model of the pump-pipeline system is presented with considering the fluid dynamic interaction effect of pump valves, plunger stroke and flow control valve. All of the predicted results coincide well with the experimental data, and the inherent mechanism and the feature of the fluid dynamic interaction are revealed by experiments and numerical analysis. It is shown that the fluid dynamic characteristics of pipeline significantly influence the lag of valve opening and the motion behaviors of pump valves. The discharge flow rate rises nonlinearly with the increase of plunger stroke and the leakage rate associated with the resistance of flow control valve. The pressure pulsation in discharge pipe is directly related to and markedly impacted by the control valve opening and the plunger stroke. However, the influence of the reservoir liquid-level on the system dynamic behavior is relatively slight. This work would give information for the optimum design and operation maintenance of reciprocating pump-pipeline system.","PeriodicalId":50080,"journal":{"name":"Journal of Pressure Vessel Technology-Transactions of the Asme","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2023-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41700922","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Although the thermal buckling problem of functionally gradient material (FGM) cylindrical shells has been investigated for many years, its theoretical solution is rarely reported when considering the material properties varying with temperature, and the existing commercial software also can't directly solve the critical temperature rise of thermal buckling. Therefore, the theoretical solution of critical temperature rise was firstly derived for the FGM-coated cylindrical shell with temperature- dependent material properties based on the Donnell thin shell theory. And then, a stepped layer discrete finite element model was developed by integrating the bisection method into a user subroutine to calculate the critical temperature rise. The results show that the theoretical solutions are in good agreement with the numerical ones, and find out the temperature has a relatively large negative effect on the thermal buckling resistance of the FGM-coated cylindrical shell. Finally, the influence factors on the critical temperature rise were discussed in detail, and some suggestions have been formed to improve the calculation accuracy. This work not only provides a theoretical calculation formula, but also develops an FE numerical method to calculate the critical temperature rise of the FGM-coated cylindrical shell, which will help the engineer to design the FGM-related structures easily.
{"title":"Investigation On Thermal Buckling of FGM-Coated Cylindrical Shell Considering Material Properties Varying with Temperature","authors":"Zewu Wang, Junbao Li, H. Fan, D. Hu","doi":"10.1115/1.4056975","DOIUrl":"https://doi.org/10.1115/1.4056975","url":null,"abstract":"\u0000 Although the thermal buckling problem of functionally gradient material (FGM) cylindrical shells has been investigated for many years, its theoretical solution is rarely reported when considering the material properties varying with temperature, and the existing commercial software also can't directly solve the critical temperature rise of thermal buckling. Therefore, the theoretical solution of critical temperature rise was firstly derived for the FGM-coated cylindrical shell with temperature- dependent material properties based on the Donnell thin shell theory. And then, a stepped layer discrete finite element model was developed by integrating the bisection method into a user subroutine to calculate the critical temperature rise. The results show that the theoretical solutions are in good agreement with the numerical ones, and find out the temperature has a relatively large negative effect on the thermal buckling resistance of the FGM-coated cylindrical shell. Finally, the influence factors on the critical temperature rise were discussed in detail, and some suggestions have been formed to improve the calculation accuracy. This work not only provides a theoretical calculation formula, but also develops an FE numerical method to calculate the critical temperature rise of the FGM-coated cylindrical shell, which will help the engineer to design the FGM-related structures easily.","PeriodicalId":50080,"journal":{"name":"Journal of Pressure Vessel Technology-Transactions of the Asme","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2023-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48966084","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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