E.V. Arbuzov, V.A. Arbuzov, Yu.N. Dubnishchev, O.S. Zolotukhina
A method for reconstructing phase disturbances of a probing light field using the iterative Gauss-Newton algorithm is discussed as part of the Hilbert diagnostics development of gaseous, condensed and reacting media. In this case, the need to determine second derivatives is eliminated, which simplifies the calculations. The method consists of selecting a phase profile, which is specified by a Bezier curve, and hilbertogram calculating. The coincidence of the reference and reconstructed hilbertograms serves as a criterion for the results reliability. The Jacobian matrix for the nonlinear integral operator of Hilbert visualization is obtained. The algorithm is analyzed using a test function. The method development is associated with the algorithm application to the processing of experimental results, including the reconstruction of complex structures in which the phase function is described by several Bezier polynomials.
{"title":"Gauss-Newton Method in the Problem of Optimizing the Axisymmetric Phase Function Calculation Based on the Hilbert Diagnostic Data","authors":"E.V. Arbuzov, V.A. Arbuzov, Yu.N. Dubnishchev, O.S. Zolotukhina","doi":"10.26583/sv.15.4.05","DOIUrl":"https://doi.org/10.26583/sv.15.4.05","url":null,"abstract":"A method for reconstructing phase disturbances of a probing light field using the iterative Gauss-Newton algorithm is discussed as part of the Hilbert diagnostics development of gaseous, condensed and reacting media. In this case, the need to determine second derivatives is eliminated, which simplifies the calculations. The method consists of selecting a phase profile, which is specified by a Bezier curve, and hilbertogram calculating. The coincidence of the reference and reconstructed hilbertograms serves as a criterion for the results reliability. The Jacobian matrix for the nonlinear integral operator of Hilbert visualization is obtained. The algorithm is analyzed using a test function. The method development is associated with the algorithm application to the processing of experimental results, including the reconstruction of complex structures in which the phase function is described by several Bezier polynomials.","PeriodicalId":38328,"journal":{"name":"Scientific Visualization","volume":"18 5","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135764699","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}
In previous studies, it was shown that the discontinuous particle method performs well in computational hydrodynamics problems with strong gradients, exemplified by the formation of an oblique stress jump. This article explores the application of the discontinuous particle method to problems involving viscosity. The investigation includes a one-dimensional Burgers' equation with an initial condition in the form of a smoothed wave and a two-dimensional Blasius problem. Numerical experiments showed agreement between the obtained solution and the analytical one. However, in the two-dimensional case, the algorithm's performance significantly decreases due to the need to determine particle neighbors. It is concluded that the discontinuous particle method can handle viscosity problems in one dimension, but modifications to the existing algorithm are required for higher-dimensional cases. The study of applying the discontinuous particle method to viscous problems was conducted as part of a comprehensive research effort comparing the relative accuracy of numerical methods on benchmark solutions.
{"title":"Visualization of Calculations of the Discontinuous Particle Method in Problems with Viscosity","authors":"S.V. Bogomolov, A.E. Kuvshinnikov","doi":"10.26583/sv.15.4.09","DOIUrl":"https://doi.org/10.26583/sv.15.4.09","url":null,"abstract":"In previous studies, it was shown that the discontinuous particle method performs well in computational hydrodynamics problems with strong gradients, exemplified by the formation of an oblique stress jump. This article explores the application of the discontinuous particle method to problems involving viscosity. The investigation includes a one-dimensional Burgers' equation with an initial condition in the form of a smoothed wave and a two-dimensional Blasius problem. Numerical experiments showed agreement between the obtained solution and the analytical one. However, in the two-dimensional case, the algorithm's performance significantly decreases due to the need to determine particle neighbors. It is concluded that the discontinuous particle method can handle viscosity problems in one dimension, but modifications to the existing algorithm are required for higher-dimensional cases. The study of applying the discontinuous particle method to viscous problems was conducted as part of a comprehensive research effort comparing the relative accuracy of numerical methods on benchmark solutions.","PeriodicalId":38328,"journal":{"name":"Scientific Visualization","volume":"13 4","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135764410","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}
Visibility Degradation is a classical problem owing to the presence of Atmospheric Particulate Matter (APM). There are different image dehazing algorithms. Any one method cannot be relied upon as each haze condition is unique. An innovative algorithm has been proposed inverting the image formation atmospheric scattering model [2, 32]. The model has been improvised by one key factor. This is Regularized Lagrangian multiplier (RLaM) based Depth Map (DM) refinement. The algorithm has low time complexity which intrigues real-time efficient applications. Different state-of-the-art visibility algorithms have been studied and their subjective and objective performance evaluations have been evaluated. Extensive investigation shows remarkable improvement with the proposed algorithm. This method is equally applicable to different atmospheric conditions. Time complexity experimented with execution time and Big (O) for real-time effectiveness. Extensive experiment results show the potential of the proposed algorithm independent of the influence of atmospheric conditions and capturing devices adaptive to computer vision applications. Time complexity and quality output trade-off achieved with the removal of ringing artifacts efficiently.
{"title":"RLaMs-Dehazing: Optimized Depth Map Improvement Single Colour Image Dehazing","authors":"Sangita Roy","doi":"10.26583/sv.15.4.03","DOIUrl":"https://doi.org/10.26583/sv.15.4.03","url":null,"abstract":"Visibility Degradation is a classical problem owing to the presence of Atmospheric Particulate Matter (APM). There are different image dehazing algorithms. Any one method cannot be relied upon as each haze condition is unique. An innovative algorithm has been proposed inverting the image formation atmospheric scattering model [2, 32]. The model has been improvised by one key factor. This is Regularized Lagrangian multiplier (RLaM) based Depth Map (DM) refinement. The algorithm has low time complexity which intrigues real-time efficient applications. Different state-of-the-art visibility algorithms have been studied and their subjective and objective performance evaluations have been evaluated. Extensive investigation shows remarkable improvement with the proposed algorithm. This method is equally applicable to different atmospheric conditions. Time complexity experimented with execution time and Big (O) for real-time effectiveness. Extensive experiment results show the potential of the proposed algorithm independent of the influence of atmospheric conditions and capturing devices adaptive to computer vision applications. Time complexity and quality output trade-off achieved with the removal of ringing artifacts efficiently.","PeriodicalId":38328,"journal":{"name":"Scientific Visualization","volume":"15 5","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135764716","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}
The paper demonstrates the potential of interferometry as a visualization technique for studying the mixing processes of liquid reagents in continuous-flow microreactors. We visualized two types of instabilities: double-diffusion convection and Marangoni soluto-capillary convection. We employed two optical schemes, depending on how large values of refractive index inhomogeneities resulting from instabilities needed to be visualized, including the shear interferometer and the Fizeau interferometer. The interferometry enabled a qualitative investigation of the structure and dynamics of the generated convection. In addition, by implementing the phase shift method by the IntelliWave program, we quantified the efficiency of the mixing process between pumped liquids. These quantitative findings complemented our qualitative visualization, providing further evidence of the effectiveness of interferometry in studying mixing processes. Our results confirm that the interferometry technique is an effective tool for the visualization and analysis of convective flows in continuous-flow microreactors. Moreover, the insights gained from this research contribute to the broader understanding and optimization of mixing processes in microreactor systems.
{"title":"Solutions Mixing Visualization in Continuous-Flow Microreactors via Interferometric Technique","authors":"E.A. Mosheva, A.V. Shmyrov, A.I. Mizev","doi":"10.26583/sv.15.3.08","DOIUrl":"https://doi.org/10.26583/sv.15.3.08","url":null,"abstract":"The paper demonstrates the potential of interferometry as a visualization technique for studying the mixing processes of liquid reagents in continuous-flow microreactors. We visualized two types of instabilities: double-diffusion convection and Marangoni soluto-capillary convection. We employed two optical schemes, depending on how large values of refractive index inhomogeneities resulting from instabilities needed to be visualized, including the shear interferometer and the Fizeau interferometer. The interferometry enabled a qualitative investigation of the structure and dynamics of the generated convection. In addition, by implementing the phase shift method by the IntelliWave program, we quantified the efficiency of the mixing process between pumped liquids. These quantitative findings complemented our qualitative visualization, providing further evidence of the effectiveness of interferometry in studying mixing processes. Our results confirm that the interferometry technique is an effective tool for the visualization and analysis of convective flows in continuous-flow microreactors. Moreover, the insights gained from this research contribute to the broader understanding and optimization of mixing processes in microreactor systems.","PeriodicalId":38328,"journal":{"name":"Scientific Visualization","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135299083","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}
G.M Zharkova, V.N. Kovrizhina, D.S. Mironov, A.Yu. Pak, A.P. Petrov
Using the example of a flow around a shallow cavity, the possibilities of liquid-crystal visualization at subsonic and supersonic flow velocities are demonstrated. To determine the flow structure at the bottom of the cavity, a coating based on a composition of pure cholesteric liquid crystals (ChLC) was used. To determine the distribution of temperatures and heat fluxes, thermosensitive films formed by encapsulation of ChLC in a polymer matrix were used. Based on the experimental results, the influence of the Mach number on the spatial pattern of the flow inside the cavity and the temperature distribution at the bottom of the cavity was obtained. The pattern of surface streamlines obtained by the LC coating coincides with that obtained using the oil film visualization. In this case, the LC method makes it possible to compare the values of shear stresses in different parts of the surface also. It is found that the occurrence of resonance phenomena leads to restructuring of the flow inside the cavity and a change in the values of shear stresses. It is shown, that in subsonic flow around the zone of increased heat transfer is concentrated near the axis of symmetry of the cavity.
{"title":"Liquid Crystal Visualization in The Study of the Flow in a Shallow Cavity","authors":"G.M Zharkova, V.N. Kovrizhina, D.S. Mironov, A.Yu. Pak, A.P. Petrov","doi":"10.26583/sv.15.3.04","DOIUrl":"https://doi.org/10.26583/sv.15.3.04","url":null,"abstract":"Using the example of a flow around a shallow cavity, the possibilities of liquid-crystal visualization at subsonic and supersonic flow velocities are demonstrated. To determine the flow structure at the bottom of the cavity, a coating based on a composition of pure cholesteric liquid crystals (ChLC) was used. To determine the distribution of temperatures and heat fluxes, thermosensitive films formed by encapsulation of ChLC in a polymer matrix were used. Based on the experimental results, the influence of the Mach number on the spatial pattern of the flow inside the cavity and the temperature distribution at the bottom of the cavity was obtained. The pattern of surface streamlines obtained by the LC coating coincides with that obtained using the oil film visualization. In this case, the LC method makes it possible to compare the values of shear stresses in different parts of the surface also. It is found that the occurrence of resonance phenomena leads to restructuring of the flow inside the cavity and a change in the values of shear stresses. It is shown, that in subsonic flow around the zone of increased heat transfer is concentrated near the axis of symmetry of the cavity.","PeriodicalId":38328,"journal":{"name":"Scientific Visualization","volume":"197 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135298759","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}
In this work, the ascent of a toroidal bubble created by the injection of a pulsed air jet into water vertically upwards is studied by the shadow method. When using the shadow method, the bubble border on the image is darkened, and the contrast in comparison with the background is increased, which makes it possible to use software processing algorithms to determine the parameters of the ring on each frame. There are experimental results indicating that, in addition to the buoyancy force, the drag force also acts on the toroidal bubble. In this paper, the experimental data on the change in the torus radius as a function of time are compared with a theoretical model constructed with and without taking into account the drag force. It is shown that taking into account the drag force leads to a much better agreement between theory and experiment. The drag force is concluded to act on toroidal bubbles, but its influence decreases with time, i.e., as the bubble rises. The drag coefficient used in the calculations is determined empirically and assumed to be constant.
{"title":"Application of Shadow Visualization to Study the Drag of Toroidal Bubbles","authors":"E.A. Chashnikov, V. V. Nikulin","doi":"10.26583/sv.15.3.06","DOIUrl":"https://doi.org/10.26583/sv.15.3.06","url":null,"abstract":"In this work, the ascent of a toroidal bubble created by the injection of a pulsed air jet into water vertically upwards is studied by the shadow method. When using the shadow method, the bubble border on the image is darkened, and the contrast in comparison with the background is increased, which makes it possible to use software processing algorithms to determine the parameters of the ring on each frame. There are experimental results indicating that, in addition to the buoyancy force, the drag force also acts on the toroidal bubble. In this paper, the experimental data on the change in the torus radius as a function of time are compared with a theoretical model constructed with and without taking into account the drag force. It is shown that taking into account the drag force leads to a much better agreement between theory and experiment. The drag force is concluded to act on toroidal bubbles, but its influence decreases with time, i.e., as the bubble rises. The drag coefficient used in the calculations is determined empirically and assumed to be constant.","PeriodicalId":38328,"journal":{"name":"Scientific Visualization","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135299084","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}
This paper discusses the results of a detailed study of bag breakup spray fragmentation process obtained using various panoramic optical methods: shadow imaging and laser-induced fluorescence (LIF) with high-speed video recording. The experiments were carried out in two fundamentally different configurations. When blowing the air flow above a deep-water layer, with the presence of large-scale waves on the surface, and vice versa in conditions of thin layers of liquid. Comparison of the results of observations demonstrated not only the general similarity of the evolution scenario, but also the dependences of the spatiotemporal scales of the process of fragmentation and the formation of droplets on the characteristic flow velocities according to the bag breakup events. This indicates the universal nature of the phenomena leading to the fragmentation and separation of drops from the surface of a liquid blown by a gas flow in natural and technical hydrodynamic systems of a wide class with scales varying over a wide range.
{"title":"Investigation of the Spray Generation due to Bag Breakup Fragmentation Phenomena with Optical Methods in Environmental and Technical Systems","authors":"D.A. Sergeev, Y.I. Troitskaya, A.V. Cherdantsev","doi":"10.26583/sv.15.3.09","DOIUrl":"https://doi.org/10.26583/sv.15.3.09","url":null,"abstract":"This paper discusses the results of a detailed study of bag breakup spray fragmentation process obtained using various panoramic optical methods: shadow imaging and laser-induced fluorescence (LIF) with high-speed video recording. The experiments were carried out in two fundamentally different configurations. When blowing the air flow above a deep-water layer, with the presence of large-scale waves on the surface, and vice versa in conditions of thin layers of liquid. Comparison of the results of observations demonstrated not only the general similarity of the evolution scenario, but also the dependences of the spatiotemporal scales of the process of fragmentation and the formation of droplets on the characteristic flow velocities according to the bag breakup events. This indicates the universal nature of the phenomena leading to the fragmentation and separation of drops from the surface of a liquid blown by a gas flow in natural and technical hydrodynamic systems of a wide class with scales varying over a wide range.","PeriodicalId":38328,"journal":{"name":"Scientific Visualization","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135297910","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}
When organizing a mass practical solution of computational problems of gas dynamics with the help of mathematical modeling, information on the comparative accuracy of the numerical methods used is now increasingly in demand. As a rule, calculators need information not only for a particular combination of the defining gas-dynamic parameters of the problem (characteristic Mach, Reynolds numbers, etc.), but also for the variation of these parameters in certain ranges. This work presents numerical studies devoted to a comparative assessment of the accuracy of numerical methods for a number of problems with reference solutions. The calculation of these problems is carried out for ranges of characteristic numbers using various numerical methods. The results obtained are compared with the reference solution and make it possible to estimate the error for each of the numerical methods. Calculations are carried out using the construction of a generalized computational experiment. A generalized computational experiment is a computational technology that combines the solution of mathematical modeling problems, parallel technologies and visual analytics technologies. The results of the generalized computational experiment are multidimensional arrays, where the dimension of the arrays corresponds to the defining parameters. Analysis and visual representation of the obtained results provide information on the comparative accuracy of the numerical method for the selected class of problems.
{"title":"Comparative Evaluation of the Accuracy of Numerical Methods on Reference Solutions","authors":"A.E. Bondarev, A.E. Kuvshinnikov","doi":"10.26583/sv.15.3.07","DOIUrl":"https://doi.org/10.26583/sv.15.3.07","url":null,"abstract":"When organizing a mass practical solution of computational problems of gas dynamics with the help of mathematical modeling, information on the comparative accuracy of the numerical methods used is now increasingly in demand. As a rule, calculators need information not only for a particular combination of the defining gas-dynamic parameters of the problem (characteristic Mach, Reynolds numbers, etc.), but also for the variation of these parameters in certain ranges. This work presents numerical studies devoted to a comparative assessment of the accuracy of numerical methods for a number of problems with reference solutions. The calculation of these problems is carried out for ranges of characteristic numbers using various numerical methods. The results obtained are compared with the reference solution and make it possible to estimate the error for each of the numerical methods. Calculations are carried out using the construction of a generalized computational experiment. A generalized computational experiment is a computational technology that combines the solution of mathematical modeling problems, parallel technologies and visual analytics technologies. The results of the generalized computational experiment are multidimensional arrays, where the dimension of the arrays corresponds to the defining parameters. Analysis and visual representation of the obtained results provide information on the comparative accuracy of the numerical method for the selected class of problems.","PeriodicalId":38328,"journal":{"name":"Scientific Visualization","volume":"89 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135298583","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}
I. Mursenkova, A. Ivanova, I. Ivanov, N. Sysoev, A. Karimov
We study the spatial structure of nonstationary inhomogeneous supersonic airflows as shock wave diffraction on an obstacle occurs in a shock tube of a rectangular cross section. The Mach numbers of shock waves were 2.7–4.4 at initial air pressures of 10–30 Torr. The supersonic flow in the discharge chamber was visualized by high-speed shadowgraphy and by the registration of radiation of combined volume discharge by photo camera and by ICCD camera. In experiments, a combined volume discharge with a current duration of ~ 500 ns was initiated 40–150 μs after the initial shock wave have passed an obstacle. It has been established that the radiation of the volume phase of discharge lasts 400–700 ns, and the displacement of the flow during this time does not exceed 0.6 mm. A correlation is established between the spatial distribution of discharge radiation and the low-density local areas determined as a result of two-dimensional Navier-Stokes based numerical simulation of the flow. As visualized by the glow of the discharge, the shape of the shock wave front is in good agreement with the results of shadowgraphy at different stages of diffraction and with the numerical simulation results.
{"title":"High-Speed Flow Visualization by a Nanosecond Volume Discharge during Shock Wave Diffraction on an Obstacle","authors":"I. Mursenkova, A. Ivanova, I. Ivanov, N. Sysoev, A. Karimov","doi":"10.26583/sv.15.3.05","DOIUrl":"https://doi.org/10.26583/sv.15.3.05","url":null,"abstract":"We study the spatial structure of nonstationary inhomogeneous supersonic airflows as shock wave diffraction on an obstacle occurs in a shock tube of a rectangular cross section. The Mach numbers of shock waves were 2.7–4.4 at initial air pressures of 10–30 Torr. The supersonic flow in the discharge chamber was visualized by high-speed shadowgraphy and by the registration of radiation of combined volume discharge by photo camera and by ICCD camera. In experiments, a combined volume discharge with a current duration of ~ 500 ns was initiated 40–150 μs after the initial shock wave have passed an obstacle. It has been established that the radiation of the volume phase of discharge lasts 400–700 ns, and the displacement of the flow during this time does not exceed 0.6 mm. A correlation is established between the spatial distribution of discharge radiation and the low-density local areas determined as a result of two-dimensional Navier-Stokes based numerical simulation of the flow. As visualized by the glow of the discharge, the shape of the shock wave front is in good agreement with the results of shadowgraphy at different stages of diffraction and with the numerical simulation results.","PeriodicalId":38328,"journal":{"name":"Scientific Visualization","volume":"89 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135298577","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}
The paper presents the thermographic studies of unsteady heat fluxes behind a plane shock wave in the rectangular 24x48 mm shock tube test section. Consecutive panoramic visualization of the heat fluxes plots on streamlined walls after the plane shock wave interaction with a rectangular obstacle fixed on the channel wall are obtained. The duration of the recorded thermal processes is up to 40 milliseconds after the shock wave passage. The heating and cooling of the test chamber walls streamlined by supersonic flow are visualized using the Telops FAST M200 high-speed infrared camera (operating range 1.5 – 5.1 microns) through the quartz windows transparent to infrared radiation. Visualization of the thermal fields were compared with the shadow images and results of 2D numerical simulation of a nonstationary gas dynamic process after the diffraction of a shock wave with Mach numbers M=2.0-4.5.
本文介绍了矩形24x48mm激波管试验段平面激波后非定常热流的热像学研究。获得了平面激波与固定在通道壁上的矩形障碍物相互作用后流线型壁面热流场的连续全景可视化。记录的热过程的持续时间在冲击波通过后长达40毫秒。通过对红外辐射透明的石英窗，使用Telops FAST M200高速红外摄像机(工作范围为1.5 - 5.1微米)对由超音速流流线型的测试室壁的加热和冷却进行可视化。将热场可视化与马赫数M=2.0-4.5的激波衍射后非平稳气体动力学过程的阴影图像和二维数值模拟结果进行了比较。
{"title":"Heat Fluxes Visualization in High Speed Flow behind the Shock Wave","authors":"I.A. Znamenskaya, M.I. Muratov, E.A. Karnozova, A.E. Lutsky","doi":"10.26583/sv.15.3.10","DOIUrl":"https://doi.org/10.26583/sv.15.3.10","url":null,"abstract":"The paper presents the thermographic studies of unsteady heat fluxes behind a plane shock wave in the rectangular 24x48 mm shock tube test section. Consecutive panoramic visualization of the heat fluxes plots on streamlined walls after the plane shock wave interaction with a rectangular obstacle fixed on the channel wall are obtained. The duration of the recorded thermal processes is up to 40 milliseconds after the shock wave passage. The heating and cooling of the test chamber walls streamlined by supersonic flow are visualized using the Telops FAST M200 high-speed infrared camera (operating range 1.5 – 5.1 microns) through the quartz windows transparent to infrared radiation. Visualization of the thermal fields were compared with the shadow images and results of 2D numerical simulation of a nonstationary gas dynamic process after the diffraction of a shock wave with Mach numbers M=2.0-4.5.","PeriodicalId":38328,"journal":{"name":"Scientific Visualization","volume":"58 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135299090","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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