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Experimental study of the action of weak shock waves on the boundary layer flow on a swept flat plate at the Mach number 2 马赫数为 2 时弱冲击波对掠过平板上边界层流动作用的实验研究
IF 0.5 4区 工程技术
Thermophysics and Aeromechanics Pub Date : 2024-12-13 DOI: 10.1134/S0869864324030077
A. D. Kosinov, N. V. Semionov, A. V. Shmakova, A. A. Yatskikh
{"title":"Experimental study of the action of weak shock waves on the boundary layer flow on a swept flat plate at the Mach number 2","authors":"A. D. Kosinov,&nbsp;N. V. Semionov,&nbsp;A. V. Shmakova,&nbsp;A. A. Yatskikh","doi":"10.1134/S0869864324030077","DOIUrl":"10.1134/S0869864324030077","url":null,"abstract":"<div><p>The action of a pair of weak shock waves on a supersonic boundary layer on a swept flat plate with a bluntness radius of the leading edge equal to 2.5 mm at the Mach number 2 is experimentally studied. Transverse hot-wire measurements are performed in the boundary layer with a fixed distance of the probe from the model surface. It is found that a change in the sweep angle of the leading edge from 35 to 45 degrees reduces the intensity of the action of the weak shock waves on the boundary layer flow. As the sweep angle of the leading edge increases to 50°, the weak shock waves no longer affect the flow in the supersonic boundary layer on the swept plate.</p></div>","PeriodicalId":800,"journal":{"name":"Thermophysics and Aeromechanics","volume":"31 3","pages":"459 - 464"},"PeriodicalIF":0.5,"publicationDate":"2024-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142821436","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}
引用次数: 0
On the parabolization of equations for the propagation of small disturbances in two-dimensional boundary layers 论二维边界层小扰动传播方程的抛物线化
IF 0.5 4区 工程技术
Thermophysics and Aeromechanics Pub Date : 2024-12-13 DOI: 10.1134/S0869864324030016
A. V. Boiko, K. V. Demyanko, G. V. Zasko, Yu. M. Nechepurenko
{"title":"On the parabolization of equations for the propagation of small disturbances in two-dimensional boundary layers","authors":"A. V. Boiko,&nbsp;K. V. Demyanko,&nbsp;G. V. Zasko,&nbsp;Yu. M. Nechepurenko","doi":"10.1134/S0869864324030016","DOIUrl":"10.1134/S0869864324030016","url":null,"abstract":"<div><p>The work is devoted to modeling the disturbance propagation in viscous incompressible laminar boundary layers, using linearized equations for disturbance amplitudes. Along with the numerical model based on original linearized equations, the article considers three models based on equations derived from the original ones by neglecting the streamwise pressure gradient, or the streamwise viscous terms, or both. The models are compared numerically by the example of generation and propagation of disturbances in the boundary layer over a slightly concave plate. Conclusions are drawn about the feasibility of the same simplified models to adequately simulate both Tollmien–Schlichting waves and Görtler vortices in a range of practically important parameters.</p></div>","PeriodicalId":800,"journal":{"name":"Thermophysics and Aeromechanics","volume":"31 3","pages":"393 - 410"},"PeriodicalIF":0.5,"publicationDate":"2024-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142821438","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}
引用次数: 0
Experimental research of Cr-Ag coatings prepared by magnetron sputtering and electroplating for ITER thermal shield 通过磁控溅射和电镀制备用于国际热核聚变实验堆热屏蔽的铬-银涂层的实验研究
IF 0.5 4区 工程技术
Thermophysics and Aeromechanics Pub Date : 2024-12-13 DOI: 10.1134/S0869864324030223
W. Liu, Sh. Huang, Sh. Du, C. Chen, X. Chen
{"title":"Experimental research of Cr-Ag coatings prepared by magnetron sputtering and electroplating for ITER thermal shield","authors":"W. Liu,&nbsp;Sh. Huang,&nbsp;Sh. Du,&nbsp;C. Chen,&nbsp;X. Chen","doi":"10.1134/S0869864324030223","DOIUrl":"10.1134/S0869864324030223","url":null,"abstract":"<div><p>The Cr-Ag coating was prepared by electroplating and magnetron sputtering on 6061 aluminum alloy matrix to balance the thermal shield radiation shielding capability and the coating performance for the International Thermonuclear Experimental Reactor (ITER) project. The microstructure, adhesion, and thermal shielding properties of the coating were analyzed. The results show that the Cr-Ag magnetron sputtering coating has flat surface, and better thickness uniformity than electroplate coating. The adhesion force of the Cr-Ag magnetron sputtering coating is 1.56 times higher than that electroplating coating, which is 53 N. The emissivity test results show that the emissivity of Cr-Ag coating by magnetron sputtering method at 80 K is 0.018, much lower than the emissivity of electroplating coating and 6061 aluminum alloy matrix. Theoretical calculation of radiant heat load based on emissivity test shows that the thermal shielding effect of Cr-Ag coating on thermal shield surface by magnetron sputtering is better than that of other groups. The results are of great significance for the combination of coating properties with broader thermal shield properties.</p></div>","PeriodicalId":800,"journal":{"name":"Thermophysics and Aeromechanics","volume":"31 3","pages":"619 - 629"},"PeriodicalIF":0.5,"publicationDate":"2024-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142821409","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}
引用次数: 0
Computational study of the processes of pulverized coal oxygen combustion in a vortex burner 涡旋燃烧器中煤粉氧燃烧过程的计算研究
IF 0.5 4区 工程技术
Thermophysics and Aeromechanics Pub Date : 2024-12-13 DOI: 10.1134/S0869864324030156
V. A. Kuznetsov, D. M. Bozheeva, A. A. Dekterev, A. V. Minakov
{"title":"Computational study of the processes of pulverized coal oxygen combustion in a vortex burner","authors":"V. A. Kuznetsov,&nbsp;D. M. Bozheeva,&nbsp;A. A. Dekterev,&nbsp;A. V. Minakov","doi":"10.1134/S0869864324030156","DOIUrl":"10.1134/S0869864324030156","url":null,"abstract":"<div><p>Numerical studies of aerodynamics and heat transfer in a vortex burner during flame oxygen combustion of pulverized coal are presented. The proposed numerical method has been tested using experimental data on oxygen combustion of coal in a flow. The influence of oxygen concentration in the blast on the processes of ignition and combustion of coal dust in a nitrogen-free environment has been considered. It has been established that for the burner under study, an increase in oxygen concentration from 40.1 to 66.7 vol. % leads to a change in the flow structure, an extension of the flame size, and an increase in the average value of unburned solid carbon concentration from 0.00136 to 0.4 g/m<sup>3</sup> at a distance of 1.5 m from the burner.</p></div>","PeriodicalId":800,"journal":{"name":"Thermophysics and Aeromechanics","volume":"31 3","pages":"523 - 530"},"PeriodicalIF":0.5,"publicationDate":"2024-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142821426","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}
引用次数: 0
Passive control of shock wave/turbulent boundary layer interaction using low permeability wall ventilation over a supercritical RAE-2822 airfoil 超临界RAE-2822翼型上采用低渗透壁面通风的激波/湍流边界层相互作用被动控制
IF 0.5 4区 工程技术
Thermophysics and Aeromechanics Pub Date : 2024-12-13 DOI: 10.1134/S086986432403020X
C. Zater, L. Bahi
{"title":"Passive control of shock wave/turbulent boundary layer interaction using low permeability wall ventilation over a supercritical RAE-2822 airfoil","authors":"C. Zater,&nbsp;L. Bahi","doi":"10.1134/S086986432403020X","DOIUrl":"10.1134/S086986432403020X","url":null,"abstract":"<div><p>The effect of a passive control concept made of a porous surface with a cavity underneath the shock wave/boundary layer interaction on a supercritical RAE-2822 airfoil in a transonic flow regime, is investigated to achieve a better efficiency using a variable porous length with a low permeability factor. A numerical approach is carried out using the commercial ANSYS Fluent code to solve the Reynolds-averaged Navier–Stokes equations of a two-dimensional, fully turbulent, compressible, and steady flow around the airfoil at M<sub>∞</sub> = 0.82, Re<sub>∞</sub> = 2·10<sup>7</sup>, and a 6° angle of attack, with the Spalart–Allmaras turbulence model. Both cases of a clean and a porous configuration, have been studies. The results showed the effect of the control technique by producing a downstream movement of the shock with a larger flow supersonic region and a reduced flow separation zone and thus a weaker SBLI, compared to the clean. Consequently, a lift increase and a drag reduction are obtained, leading to an improvement in the aerodynamic efficiency. Seeking for a higher control efficiency, variable porous surface lengths and low permeability factors, have been tested. The best aerodynamic efficiency was obtained with a full-chord porosity and a low permeability factor of 10<sup>−6</sup>, with an appreciable gain in lift of 47 % and a substantial net drag reduction of 65 %.</p></div>","PeriodicalId":800,"journal":{"name":"Thermophysics and Aeromechanics","volume":"31 3","pages":"583 - 597"},"PeriodicalIF":0.5,"publicationDate":"2024-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142821408","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}
引用次数: 0
Experimental investigation of thermal distribution on an airfoil wing coated with nanomaterials in a supersonic flow 超声速流动中纳米涂层翼型机翼热分布的实验研究
IF 0.5 4区 工程技术
Thermophysics and Aeromechanics Pub Date : 2024-12-13 DOI: 10.1134/S0869864324030193
L. Kasi, P. Thangavelu
{"title":"Experimental investigation of thermal distribution on an airfoil wing coated with nanomaterials in a supersonic flow","authors":"L. Kasi,&nbsp;P. Thangavelu","doi":"10.1134/S0869864324030193","DOIUrl":"10.1134/S0869864324030193","url":null,"abstract":"<div><p>The thermal instability experienced by aircraft beyond supersonic speeds poses a significant risk to structural stability, particularly due to airfoil surface delamination. Conventional methods of addressing this issue involve incorporating thermal shields and modifying the design, but these approaches require extensive redesigning and lack scalability. However, an alternative approach is to reduce surface temperature distribution and minimize surface drag through the application of nanomaterial coatings. In this study, graphene nanocoating was utilized to reduce the surface roughness of the TsAGI S-12 airfoil. The thermal characteristics of the coated airfoil were evaluated using infrared (IR) imaging. The results of wind tunnel experiments showed a remarkable 21 % reduction in surface temperature and an 18 % reduction in shock wave angle compared to the conventional airfoil. Additionally, atomic force microscopy (AFM) analysis of the coated nanomaterial surface revealed a decrease in surface roughness from 20 nm to 2 nm. The use of nanomaterial surface coatings proves to be a simple and highly effective method for reducing surface temperature and minimizing shockwaves. Moreover, it offers the advantage of high scalability, making it easily applicable in the aircraft industry. Ultimately, the application of nanomaterial coatings has the potential to revolutionize the supersonic aviation industry by enhancing stability and performance.</p></div>","PeriodicalId":800,"journal":{"name":"Thermophysics and Aeromechanics","volume":"31 3","pages":"563 - 582"},"PeriodicalIF":0.5,"publicationDate":"2024-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142821411","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}
引用次数: 0
Experimental study of gas bubble evolution in liquid metal 液态金属中气泡演化的实验研究
IF 0.5 4区 工程技术
Thermophysics and Aeromechanics Pub Date : 2024-12-13 DOI: 10.1134/S0869864324030120
N. A. Pribaturin, P. D. Lobanov, A. I. Svetonosov, A. S. Kurdyumov, A. V. Chinak, S. M. Volkov
{"title":"Experimental study of gas bubble evolution in liquid metal","authors":"N. A. Pribaturin,&nbsp;P. D. Lobanov,&nbsp;A. I. Svetonosov,&nbsp;A. S. Kurdyumov,&nbsp;A. V. Chinak,&nbsp;S. M. Volkov","doi":"10.1134/S0869864324030120","DOIUrl":"10.1134/S0869864324030120","url":null,"abstract":"<div><p>The experimental results on the structure of the two-phase “liquid metal-gas” medium in vertical channels depending on the gas flow rate and channel diameter are presented. Lead-bismuth melt at a temperature of 160°C was used as a liquid medium, and argon was used as a gas phase. Data were obtained on the shape of gas bubbles, temporary changes in the gas content in channels, histograms of gas content distribution, and features of the slug flow of gas in the metal melt.</p></div>","PeriodicalId":800,"journal":{"name":"Thermophysics and Aeromechanics","volume":"31 3","pages":"495 - 502"},"PeriodicalIF":0.5,"publicationDate":"2024-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142821425","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}
引用次数: 0
Dynamics of the temperature field in a massive substrate under the effect of a concentrated heat flux 集中热流作用下块状基底温度场的动力学特性
IF 0.5 4区 工程技术
Thermophysics and Aeromechanics Pub Date : 2024-12-13 DOI: 10.1134/S0869864324030132
A. I. Fedorchenko, V. V. Terekhov, N. Yan Lun
{"title":"Dynamics of the temperature field in a massive substrate under the effect of a concentrated heat flux","authors":"A. I. Fedorchenko,&nbsp;V. V. Terekhov,&nbsp;N. Yan Lun","doi":"10.1134/S0869864324030132","DOIUrl":"10.1134/S0869864324030132","url":null,"abstract":"<div><p>The results of an analytical solution to the problem of heat distribution inside a massive solid sample with concentrated heat supply to this sample surface are presented. Analytical expressions for the non-stationary temperature distribution inside the body are obtained using the integral cosine Fourier transform and the Hankel transform. Examples of solution application for estimating the characteristic times of reaching the Chernov points Ac<sub>1</sub> and Ac<sub>3</sub> in model hypoeutectoid steels under the effect of laser radiation are presented. The application of this solution to calculating the cooling dynamics of ceramic Al<sub>2</sub>O<sub>3</sub> and SiO<sub>2</sub> samples, affected by the air and water jets, is demonstrated.</p></div>","PeriodicalId":800,"journal":{"name":"Thermophysics and Aeromechanics","volume":"31 3","pages":"503 - 511"},"PeriodicalIF":0.5,"publicationDate":"2024-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142821428","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}
引用次数: 0
Study of the gas-driven atomization for a steel material 钢铁材料的气体驱动雾化研究
IF 0.5 4区 工程技术
Thermophysics and Aeromechanics Pub Date : 2024-12-13 DOI: 10.1134/S0869864324030181
D. V. Sergachev, V. I. Kuzmin, I. P. Gulyaev, S. P. Vaschenko
{"title":"Study of the gas-driven atomization for a steel material","authors":"D. V. Sergachev,&nbsp;V. I. Kuzmin,&nbsp;I. P. Gulyaev,&nbsp;S. P. Vaschenko","doi":"10.1134/S0869864324030181","DOIUrl":"10.1134/S0869864324030181","url":null,"abstract":"<div><p>Gas atomization is the major approach for production of metal powders. This method gives up to 70 % of the entire metal powder production. However, modern trends demonstrate new requirements to the particle size distribution. This drives the development of new methods for power production. In this study the plasma-jet atomization method was presented.</p></div>","PeriodicalId":800,"journal":{"name":"Thermophysics and Aeromechanics","volume":"31 3","pages":"557 - 562"},"PeriodicalIF":0.5,"publicationDate":"2024-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142821412","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}
引用次数: 0
Investigation of hydrodynamic characteristics of a stationary Taylor bubble at different velocities of a downward liquid flow 静止泰勒泡在不同向下流动速度下的水动力特性研究
IF 0.5 4区 工程技术
Thermophysics and Aeromechanics Pub Date : 2024-12-13 DOI: 10.1134/S0869864324030168
O. N. Kashinsky, M. V. Alekseev, An. A. Lukyanov, A. S. Kurdyumov, P. D. Lobanov
{"title":"Investigation of hydrodynamic characteristics of a stationary Taylor bubble at different velocities of a downward liquid flow","authors":"O. N. Kashinsky,&nbsp;M. V. Alekseev,&nbsp;An. A. Lukyanov,&nbsp;A. S. Kurdyumov,&nbsp;P. D. Lobanov","doi":"10.1134/S0869864324030168","DOIUrl":"10.1134/S0869864324030168","url":null,"abstract":"<div><p>The flow around a stationary gas Taylor bubble at downward flow velocities from 0.15 to 0.3 m/s in a vertical tube with a diameter of 20 mm was experimentally and numerically studied. Three-dimensional calculations were performed using the VOF (volume of fluid) method in the OpenFOAM package with application of the unsteady <i>k</i>–<i>ω</i> SST turbulence model. Hydrodynamic characteristics of the flow were experimentally studied using the electrodiffusion method. The effect of flow velocity on the change in the shape of the gas Taylor bubble nose was shown. The calculated and experimental data were compared and their good agreement was shown. The distribution of velocities in liquid and gas was studied as well as the distribution of the liquid film thickness around a gas Taylor bubble. It is shown that the wall shear stress in the liquid film around a gas Taylor bubble does not depend on the downward flow velocity.</p></div>","PeriodicalId":800,"journal":{"name":"Thermophysics and Aeromechanics","volume":"31 3","pages":"531 - 546"},"PeriodicalIF":0.5,"publicationDate":"2024-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142821410","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}
引用次数: 0
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