Pub Date : 2023-07-01DOI: 10.18698/0536-1044-2023-7-93-106
A. Trulev, S. Timushev, A. Lomakin, A.V. Klipov
In the oil producing wells with high content of mechanical impurities and free gas, efficiency of the electric centrifugal pump is increased by installing the cyclone-type desenders at its inlet. Desender protects the submersed pump from mechanical impurities entering it by separation and collecting them in a special container. At the same time, the problem of free gas bubbles enlargement is being solved to facilitate their separation into the annulus and thus reduce the free gas content at the pump inlet. Analysis was made of specifics of the formation fluid flow containing mechanical impurities and free gas in the flow path of a cyclone-type separator with the fixed screw. Expressions were derived to determine the dimensionless multiphase coefficient of the discrete particles relative separation rate and of the multiphase similarity criterion. They allow evaluating efficiency of the mechanical impurity separators and developing new highly efficient structures based on the previously created ones. Recommendations are provided for development of the new highly efficient structures.
{"title":"Improving flow path of the cyclone-type desenders using the multiphase coefficient of the discrete particles relative speed","authors":"A. Trulev, S. Timushev, A. Lomakin, A.V. Klipov","doi":"10.18698/0536-1044-2023-7-93-106","DOIUrl":"https://doi.org/10.18698/0536-1044-2023-7-93-106","url":null,"abstract":"In the oil producing wells with high content of mechanical impurities and free gas, efficiency of the electric centrifugal pump is increased by installing the cyclone-type desenders at its inlet. Desender protects the submersed pump from mechanical impurities entering it by separation and collecting them in a special container. At the same time, the problem of free gas bubbles enlargement is being solved to facilitate their separation into the annulus and thus reduce the free gas content at the pump inlet. Analysis was made of specifics of the formation fluid flow containing mechanical impurities and free gas in the flow path of a cyclone-type separator with the fixed screw. Expressions were derived to determine the dimensionless multiphase coefficient of the discrete particles relative separation rate and of the multiphase similarity criterion. They allow evaluating efficiency of the mechanical impurity separators and developing new highly efficient structures based on the previously created ones. Recommendations are provided for development of the new highly efficient structures.","PeriodicalId":198502,"journal":{"name":"Proceedings of Higher Educational Institutions. Маchine Building","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116184393","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-07-01DOI: 10.18698/0536-1044-2023-7-64-76
B. Ponomarev, Van Duc Nguyen
The paper presents results of simulating stress state in the cutting edge zone of the radial end milling cutter with the given tool orientation along the transverse angle. Simulation involved calculating the cutting forces in the ABAQUS program, converting them into loads acting on the tool surface, determining the contact zone of the tool front surface with chips based on the cutting theory and calculating stresses with the uniform load distribution in the considered tool section. Results of the preliminary calculations are provided. Distribution curves of the equivalent, normal and shear stresses in the cutting edge zone of the radial end milling cutter obtained using hardware of the ANSYS finite element analysis system were constructed. Simulation results allow further research to study the tool orientation and the cutting conditions influence on the tool stress state in shaping the complex surfaces. Determination of the machined surface zones, where the calculated stress values exceed the critical values, using the model makes it possible already at the initial stage of the technological process development to exclude destruction of the tool cutting edges and to achieve maximum productivity in shaping the complex surfaces.
{"title":"Stress state simulation of the radial end milling cutter at shaping the complex surfaces","authors":"B. Ponomarev, Van Duc Nguyen","doi":"10.18698/0536-1044-2023-7-64-76","DOIUrl":"https://doi.org/10.18698/0536-1044-2023-7-64-76","url":null,"abstract":"The paper presents results of simulating stress state in the cutting edge zone of the radial end milling cutter with the given tool orientation along the transverse angle. Simulation involved calculating the cutting forces in the ABAQUS program, converting them into loads acting on the tool surface, determining the contact zone of the tool front surface with chips based on the cutting theory and calculating stresses with the uniform load distribution in the considered tool section. Results of the preliminary calculations are provided. Distribution curves of the equivalent, normal and shear stresses in the cutting edge zone of the radial end milling cutter obtained using hardware of the ANSYS finite element analysis system were constructed. Simulation results allow further research to study the tool orientation and the cutting conditions influence on the tool stress state in shaping the complex surfaces. Determination of the machined surface zones, where the calculated stress values exceed the critical values, using the model makes it possible already at the initial stage of the technological process development to exclude destruction of the tool cutting edges and to achieve maximum productivity in shaping the complex surfaces.","PeriodicalId":198502,"journal":{"name":"Proceedings of Higher Educational Institutions. Маchine Building","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134019085","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-07-01DOI: 10.18698/0536-1044-2023-7-22-34
O. Malkov
Analysis of the works devoted to thread milling showed that milling of the threads with a special profile differing from the metric profile was not sufficiently studied. Based on data of the existing threads profile analysis, the paper proposes a generalized profiling scheme using the example of a round thread. The theory of envelopes of the cutting tool positions family makes it possible to analyze the shape of the resulting thread profile and the cutting tool profiling in shaping with a kinematic scheme of thread milling with the parallel thread and tool axes. Mathematical expressions are provided that allow calculating geometric error in the round thread using the proposed method and profiling a thread cutter to form the thread of the accepted accuracy degree. The specified method could be extended to a thread with any profile described by a mathematical expression in its axial plane. Study results could be useful to the developers in designing the thread mills and to the technologists to assess the possibility of using thread milling in machining threads with the round profile.
{"title":"Method of the internal threads profiling at milling","authors":"O. Malkov","doi":"10.18698/0536-1044-2023-7-22-34","DOIUrl":"https://doi.org/10.18698/0536-1044-2023-7-22-34","url":null,"abstract":"Analysis of the works devoted to thread milling showed that milling of the threads with a special profile differing from the metric profile was not sufficiently studied. Based on data of the existing threads profile analysis, the paper proposes a generalized profiling scheme using the example of a round thread. The theory of envelopes of the cutting tool positions family makes it possible to analyze the shape of the resulting thread profile and the cutting tool profiling in shaping with a kinematic scheme of thread milling with the parallel thread and tool axes. Mathematical expressions are provided that allow calculating geometric error in the round thread using the proposed method and profiling a thread cutter to form the thread of the accepted accuracy degree. The specified method could be extended to a thread with any profile described by a mathematical expression in its axial plane. Study results could be useful to the developers in designing the thread mills and to the technologists to assess the possibility of using thread milling in machining threads with the round profile.","PeriodicalId":198502,"journal":{"name":"Proceedings of Higher Educational Institutions. Маchine Building","volume":"380 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131816962","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-07-01DOI: 10.18698/0536-1044-2023-7-54-63
S. Zaides, M. Q. Ho
The paper uses the weight method in corrosion determination to establish technological parameters and modes of the pendulum surface plastic deformation of the hardened parts in regard to the corrosion resistance. The mass index was used to assess corrosion, which source was the sulfuric acid with the 15% concentration. Analysis of the experimental research data showed that corrosion resistance of the hardened parts largely depended on their surfaces roughness. Correlation dependence of the corrosion resistance on roughness was constructed. Based on the multiple regression analysis results, empirical equations were obtained to optimize corrosion resistance of the parts hardened by the pendulum surface plastic deformation. The following optimal modes of the pendulum surface plastic deformation were identified ensuring maximum corrosion resistance of the hardened parts: workpiece rotation frequency — 80…100 min?1; pendulum motion frequency of the working tool — 40...55 strokes/min; radial interference — 0.1 mm; longitudinal feed — 0.07...0.11 mm/rev; working tool rotation angle — 15...20°.
{"title":"Influence of the pendulum surface plastic deformation on the machine part corrosion resistance","authors":"S. Zaides, M. Q. Ho","doi":"10.18698/0536-1044-2023-7-54-63","DOIUrl":"https://doi.org/10.18698/0536-1044-2023-7-54-63","url":null,"abstract":"The paper uses the weight method in corrosion determination to establish technological parameters and modes of the pendulum surface plastic deformation of the hardened parts in regard to the corrosion resistance. The mass index was used to assess corrosion, which source was the sulfuric acid with the 15% concentration. Analysis of the experimental research data showed that corrosion resistance of the hardened parts largely depended on their surfaces roughness. Correlation dependence of the corrosion resistance on roughness was constructed. Based on the multiple regression analysis results, empirical equations were obtained to optimize corrosion resistance of the parts hardened by the pendulum surface plastic deformation. The following optimal modes of the pendulum surface plastic deformation were identified ensuring maximum corrosion resistance of the hardened parts: workpiece rotation frequency — 80…100 min?1; pendulum motion frequency of the working tool — 40...55 strokes/min; radial interference — 0.1 mm; longitudinal feed — 0.07...0.11 mm/rev; working tool rotation angle — 15...20°.","PeriodicalId":198502,"journal":{"name":"Proceedings of Higher Educational Institutions. Маchine Building","volume":"60 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128488619","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-07-01DOI: 10.18698/0536-1044-2023-7-113-123
V. A. Altunin, M. Lvov, A. Shchigolev, A. Yusupov, M. L. Yanovskaya
The paper analyzes the need to design, develop and create an experimental installation to study thermal processes in the aviation engine oils at their forced convection and in various thermodynamic conditions close to the real ones in different aircraft engines. It presents the experimental installation design scheme to study heat transfer and sedimentation in the aviation engine oils at their forced convection without and with the electrostatic fields influence. Working sections schemes with one and three pairs of coaxial working needles are shown. Technique for conducting comprehensive experiments was developed. For the first time, influence of the transverse electrostatic fields on the heat transfer and sedimentation in the engine oils during their forced convection was studied. The proposed installation allows experiments not only with the aviation engine oils, but also with the liquid hydrocarbon fuels and their mixtures. Study results would contribute to creating new domestic equipment for various purposes and ensuring the improved characteristics in terms of lifetime, reliability and efficiency.
{"title":"Experimental installation for the study of the influence of electrostatic fields on heat exchange and the process of sedimentation in motor aviation oil with its forced convection","authors":"V. A. Altunin, M. Lvov, A. Shchigolev, A. Yusupov, M. L. Yanovskaya","doi":"10.18698/0536-1044-2023-7-113-123","DOIUrl":"https://doi.org/10.18698/0536-1044-2023-7-113-123","url":null,"abstract":"The paper analyzes the need to design, develop and create an experimental installation to study thermal processes in the aviation engine oils at their forced convection and in various thermodynamic conditions close to the real ones in different aircraft engines. It presents the experimental installation design scheme to study heat transfer and sedimentation in the aviation engine oils at their forced convection without and with the electrostatic fields influence. Working sections schemes with one and three pairs of coaxial working needles are shown. Technique for conducting comprehensive experiments was developed. For the first time, influence of the transverse electrostatic fields on the heat transfer and sedimentation in the engine oils during their forced convection was studied. The proposed installation allows experiments not only with the aviation engine oils, but also with the liquid hydrocarbon fuels and their mixtures. Study results would contribute to creating new domestic equipment for various purposes and ensuring the improved characteristics in terms of lifetime, reliability and efficiency.","PeriodicalId":198502,"journal":{"name":"Proceedings of Higher Educational Institutions. Маchine Building","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115203503","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-06-01DOI: 10.18698/0536-1044-2023-6-47-57
I.Yu. Timokhin, A. Anashkina, G. A. Kharakhonov, Ya.O. Ermolaev
The cutting force is an important parameter in control and management of the machining processes. A system for measuring and registering the cutting forces in the process of machining the complex profile ceramic parts for aviation purposes was designed, developed and tested making it possible to measure with reference to the machined area height (to the Z coordinate) on the existing numerical control system. KF5P1-5-200 strain gauges with a full-bridge connection scheme were selected as the deformation sensors. Deformation of the grinding spindle body of a special machine with the SA950S30F4K.01 numerical control exposed to action of the cutting force radial component was assessed, and the zone of maximum stresses was determined, where the strain gauges were installed. The system was calibrated to measure the cutting forces using the developed power frame and the reference dynamometer. Software was created that makes it possible to register and analyze the data obtained, as well as to visualize the process of measuring the cutting forces in real time during the ceramic parts machining. Based on the results of testing the developed system and software, the possibility was established to measure the cutting forces during machining the complex profile ceramic parts, to visualize, register and print the results. Such a system could be used in the scientific research laboratories and pilot production in the ceramic parts machining.
{"title":"Cutting force measurement during machining of the ceramic parts designed for aviation purposes","authors":"I.Yu. Timokhin, A. Anashkina, G. A. Kharakhonov, Ya.O. Ermolaev","doi":"10.18698/0536-1044-2023-6-47-57","DOIUrl":"https://doi.org/10.18698/0536-1044-2023-6-47-57","url":null,"abstract":"The cutting force is an important parameter in control and management of the machining processes. A system for measuring and registering the cutting forces in the process of machining the complex profile ceramic parts for aviation purposes was designed, developed and tested making it possible to measure with reference to the machined area height (to the Z coordinate) on the existing numerical control system. KF5P1-5-200 strain gauges with a full-bridge connection scheme were selected as the deformation sensors. Deformation of the grinding spindle body of a special machine with the SA950S30F4K.01 numerical control exposed to action of the cutting force radial component was assessed, and the zone of maximum stresses was determined, where the strain gauges were installed. The system was calibrated to measure the cutting forces using the developed power frame and the reference dynamometer. Software was created that makes it possible to register and analyze the data obtained, as well as to visualize the process of measuring the cutting forces in real time during the ceramic parts machining. Based on the results of testing the developed system and software, the possibility was established to measure the cutting forces during machining the complex profile ceramic parts, to visualize, register and print the results. Such a system could be used in the scientific research laboratories and pilot production in the ceramic parts machining.","PeriodicalId":198502,"journal":{"name":"Proceedings of Higher Educational Institutions. Маchine Building","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115232407","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-06-01DOI: 10.18698/0536-1044-2023-6-79-88
A. Trulev, S. Timushev, V. Lomakin, E. Shmidt
Increase in efficiency of the centrifugal pumps used in the oil producing wells with high content of the free gas is achieved by equipping them with the gas separators, where most of the free gas is sorted out from the pumped medium and discharged into the well annular space before entering the pump inlet. Gas separators are one of the main means to protect pumps from the harmful effects of free gas. In this regard, an urgent task is to conduct correct bench tests of the gas separators, as an integral part of measures aimed at improving their design and efficiency. Analysis of the existing benches and test methods for gas separators of the submersible electric centrifugal pump installations for oil production was carried out. Technique and bench pneumohydraulic scheme was proposed for testing a gas separator with a section of the electric centrifugal pump installed at the outlet. Methodological principles of bench testing the gas separator to determine efficiency of the free gas separation were developed.
{"title":"Methodological principles of bench testing the gas separators of the submersible electric centrifugal pump installations in oil production","authors":"A. Trulev, S. Timushev, V. Lomakin, E. Shmidt","doi":"10.18698/0536-1044-2023-6-79-88","DOIUrl":"https://doi.org/10.18698/0536-1044-2023-6-79-88","url":null,"abstract":"Increase in efficiency of the centrifugal pumps used in the oil producing wells with high content of the free gas is achieved by equipping them with the gas separators, where most of the free gas is sorted out from the pumped medium and discharged into the well annular space before entering the pump inlet. Gas separators are one of the main means to protect pumps from the harmful effects of free gas. In this regard, an urgent task is to conduct correct bench tests of the gas separators, as an integral part of measures aimed at improving their design and efficiency. Analysis of the existing benches and test methods for gas separators of the submersible electric centrifugal pump installations for oil production was carried out. Technique and bench pneumohydraulic scheme was proposed for testing a gas separator with a section of the electric centrifugal pump installed at the outlet. Methodological principles of bench testing the gas separator to determine efficiency of the free gas separation were developed.","PeriodicalId":198502,"journal":{"name":"Proceedings of Higher Educational Institutions. Маchine Building","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126446581","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-06-01DOI: 10.18698/0536-1044-2023-6-3-11
S. Palochkin, M.A. Karnaukhov, M. A. Lyubchenko, P. Rudovskiy
The paper presents results of the theoretical research of the structural vibration damping in the variable stiffness couplings with a serpentine spring, which are rather widely used in the drives of the heavy engineering and machine tool products exposed to the vibration loads. When performing dynamic calculations of the drives of such machines, it is necessary to know the dissipative characteristics of their components and parts, including the indicated couplings. The paper considers the case of torsional harmonic vibrations characteristic for the coupling drive with a serpentine spring associated with twisting of the shafts connected by this coupling due to the attached parts imbalance. Quantitative characteristics of the torsional vibration energy dissipation in the couplings under consideration were studied and determined using the well-known method for estimating the vibration energy losses due to friction during slipping in the compressed parts’ contact. Mathematical model of the torsional vibration damping in a coupling was developed, which makes it possible to determine its quantitative characteristics in the form of vibration energy dissipation per cycle and the absorption coefficient depending on the coupling design parameters and the vibration process. The proposed model is implemented as an interactive application program in the MATLAB computer environment.
{"title":"Energy dissipation in the variable stiffness couplings with a serpentine spring at the torsional vibrations","authors":"S. Palochkin, M.A. Karnaukhov, M. A. Lyubchenko, P. Rudovskiy","doi":"10.18698/0536-1044-2023-6-3-11","DOIUrl":"https://doi.org/10.18698/0536-1044-2023-6-3-11","url":null,"abstract":"The paper presents results of the theoretical research of the structural vibration damping in the variable stiffness couplings with a serpentine spring, which are rather widely used in the drives of the heavy engineering and machine tool products exposed to the vibration loads. When performing dynamic calculations of the drives of such machines, it is necessary to know the dissipative characteristics of their components and parts, including the indicated couplings. The paper considers the case of torsional harmonic vibrations characteristic for the coupling drive with a serpentine spring associated with twisting of the shafts connected by this coupling due to the attached parts imbalance. Quantitative characteristics of the torsional vibration energy dissipation in the couplings under consideration were studied and determined using the well-known method for estimating the vibration energy losses due to friction during slipping in the compressed parts’ contact. Mathematical model of the torsional vibration damping in a coupling was developed, which makes it possible to determine its quantitative characteristics in the form of vibration energy dissipation per cycle and the absorption coefficient depending on the coupling design parameters and the vibration process. The proposed model is implemented as an interactive application program in the MATLAB computer environment.","PeriodicalId":198502,"journal":{"name":"Proceedings of Higher Educational Institutions. Маchine Building","volume":"103 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117307422","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-06-01DOI: 10.18698/0536-1044-2023-6-119-132
S. Reznik, E. Abramova
The promising solution in reducing pollution of the low Earth orbits by space debris consisting of artificial satellites, other spacecraft and elements of the launch vehicles and upper stages that exhausted their resources lies in introduction of the inflatable braking devices. The simplest version of such a system could be a thin-walled shell made of polymeric material being stored in a folded form in the satellite’s transport container and being inflated at the right time on command acquiring the given configuration. Large area of the shell midsection provides an increase in the braking force in the highly rarefied atmosphere and a decrease in the flight velocity followed by a descent into the atmosphere dense layers for liquidation. Selection of the rational parameters for the braking device inflatable shell provides for solution of rather complex interdisciplinary problems. Among them, the task of determining the inflatable shell temperature state is distinguished, which would be formed exposed to action of the thermal radiation fluxes from the Sun, the Earth and kinetic heating caused by motion in the free molecular medium. Heat transfer specifics of the thin-walled spherical shell of an inflatable braking device designed to remove the obsolete CubeSat-class nanosatellites positioned in the low Earth orbits were considered.
{"title":"Key issues of creating the inflatable braking devices for removal of the failed satellites into the atmosphere dense layers Part 2. Analysis of the thermal regime under the combined heating conditions","authors":"S. Reznik, E. Abramova","doi":"10.18698/0536-1044-2023-6-119-132","DOIUrl":"https://doi.org/10.18698/0536-1044-2023-6-119-132","url":null,"abstract":"The promising solution in reducing pollution of the low Earth orbits by space debris consisting of artificial satellites, other spacecraft and elements of the launch vehicles and upper stages that exhausted their resources lies in introduction of the inflatable braking devices. The simplest version of such a system could be a thin-walled shell made of polymeric material being stored in a folded form in the satellite’s transport container and being inflated at the right time on command acquiring the given configuration. Large area of the shell midsection provides an increase in the braking force in the highly rarefied atmosphere and a decrease in the flight velocity followed by a descent into the atmosphere dense layers for liquidation. Selection of the rational parameters for the braking device inflatable shell provides for solution of rather complex interdisciplinary problems. Among them, the task of determining the inflatable shell temperature state is distinguished, which would be formed exposed to action of the thermal radiation fluxes from the Sun, the Earth and kinetic heating caused by motion in the free molecular medium. Heat transfer specifics of the thin-walled spherical shell of an inflatable braking device designed to remove the obsolete CubeSat-class nanosatellites positioned in the low Earth orbits were considered.","PeriodicalId":198502,"journal":{"name":"Proceedings of Higher Educational Institutions. Маchine Building","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124499614","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-06-01DOI: 10.18698/0536-1044-2023-6-108-118
V. Pismennyi
The paper presents methods and techniques used in increasing gas temperature in front of the turbine blades of the gas turbine engine making it possible in the aggregate to reach the gas temperature of 2300 K. Gas turbine blades made on the basis of the best nickel alloys could operate for a long time without cooling at the temperature of not more than 1300 K. Convective-film cooling today appears to be the most effective method of air cooling the blades, due to which (in combination with the heat-shielding coatings) gas temperature of 2000 K is reached in the fifth-generation gas turbine engines. Significant increase in the efficiency of the turbine blades internal cooling (convective, convective-film, porous) is obtained with using the external cooling, i.e. decreasing the cooling air temperature by the cooling resource of the external environment: atmospheric air (secondary air), water and fuel. External cooling when using the convective-film cooling makes it possible to increase gas temperature in front of the turbine blades by 0.6 ... 1.5 K for each degree in the cooling air temperature decrease. A circulating heat exchanger is proposed, which lowers the cooling air temperature almost to the ambient temperature making it possible in combination with the known methods and techniques for increasing the gas temperature (heat-resistant materials, heat-shielding coatings, convective-film cooling) to increase gas temperature in front of the turbine blades by 300...400 K and bring it up to at least 2300 K. This would allow today to start creating stoichiometric and hyperforced gas turbine engines and to increase the bypass turbojet engines efficiency up to 45%. Air-liquid cooling is a variation of the turbine blades external cooling. The possibility (technical solutions were patented) of introducing the air-liquid cooling in gas turbine engines at the high flight speeds, including the turbojet engines, was studied.
{"title":"Methods and techniques used in increasing gas temperature in front of the gas turbine engine turbine","authors":"V. Pismennyi","doi":"10.18698/0536-1044-2023-6-108-118","DOIUrl":"https://doi.org/10.18698/0536-1044-2023-6-108-118","url":null,"abstract":"The paper presents methods and techniques used in increasing gas temperature in front of the turbine blades of the gas turbine engine making it possible in the aggregate to reach the gas temperature of 2300 K. Gas turbine blades made on the basis of the best nickel alloys could operate for a long time without cooling at the temperature of not more than 1300 K. Convective-film cooling today appears to be the most effective method of air cooling the blades, due to which (in combination with the heat-shielding coatings) gas temperature of 2000 K is reached in the fifth-generation gas turbine engines. Significant increase in the efficiency of the turbine blades internal cooling (convective, convective-film, porous) is obtained with using the external cooling, i.e. decreasing the cooling air temperature by the cooling resource of the external environment: atmospheric air (secondary air), water and fuel. External cooling when using the convective-film cooling makes it possible to increase gas temperature in front of the turbine blades by 0.6 ... 1.5 K for each degree in the cooling air temperature decrease. A circulating heat exchanger is proposed, which lowers the cooling air temperature almost to the ambient temperature making it possible in combination with the known methods and techniques for increasing the gas temperature (heat-resistant materials, heat-shielding coatings, convective-film cooling) to increase gas temperature in front of the turbine blades by 300...400 K and bring it up to at least 2300 K. This would allow today to start creating stoichiometric and hyperforced gas turbine engines and to increase the bypass turbojet engines efficiency up to 45%. Air-liquid cooling is a variation of the turbine blades external cooling. The possibility (technical solutions were patented) of introducing the air-liquid cooling in gas turbine engines at the high flight speeds, including the turbojet engines, was studied.","PeriodicalId":198502,"journal":{"name":"Proceedings of Higher Educational Institutions. Маchine Building","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121673699","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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