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Stabilization of disturbances in a supersonic boundary layer using a compliant coating 用柔性涂层稳定超音速边界层中的扰动
IF 0.5 4区 工程技术
Thermophysics and Aeromechanics Pub Date : 2026-07-25 DOI: 10.1134/S0869864326010014
V. I. Lysenko, B. V. Smorodsky, S. A. Gaponov
{"title":"Stabilization of disturbances in a supersonic boundary layer using a compliant coating","authors":"V. I. Lysenko,&nbsp;B. V. Smorodsky,&nbsp;S. A. Gaponov","doi":"10.1134/S0869864326010014","DOIUrl":"10.1134/S0869864326010014","url":null,"abstract":"<div><p>The effect of a compliant coating (thin-film) over a porous surface on the stability of a supersonic (M = 2) boundary layer on a flat plate to disturbances of the first mode of instability under the conditions of experiments in the T-325 wind tunnel was calculated using linear stability theory. The calculations showed that a porous coating with a thin-film membrane on the surface can stabilize the boundary layer at Mach number M = 2 at the most amplifying frequency on an impermeable solid plate. The dependences of the spatial amplification rates of disturbances on a number of factors were established. Nonmonotonic (with minima) dependences of these growth rates on film tension, pore radius, porous coating depth, and porosity were obtained. The spatial growth rates of disturbances decrease with decreasing film thickness and the ratio of the gas pressure inside the pores to the static pressure in the boundary layer. It was found that stabilization of a supersonic (M = 2) boundary layer relative to the case of a smooth impermeable plate can occur only with a film thickness of less than 18 nm.</p></div>","PeriodicalId":800,"journal":{"name":"Thermophysics and Aeromechanics","volume":"33 1","pages":"1 - 21"},"PeriodicalIF":0.5,"publicationDate":"2026-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148614281","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 on a gas jet blowing with the influence on pressure variation on a cylinder with across gas flow 气喷吹对跨气流圆筒压力变化影响的研究
IF 0.5 4区 工程技术
Thermophysics and Aeromechanics Pub Date : 2026-07-25 DOI: 10.1134/S0869864326010026
V. A. Kislovskiy, D. A. Semchenko
{"title":"Investigation on a gas jet blowing with the influence on pressure variation on a cylinder with across gas flow","authors":"V. A. Kislovskiy,&nbsp;D. A. Semchenko","doi":"10.1134/S0869864326010026","DOIUrl":"10.1134/S0869864326010026","url":null,"abstract":"<div><p>The paper presents experimental results from a study on supersonic flow across a cylinder. Selected measurements of pressure on the cylinder surface were taken. Different variants of jet blowing were tested with a focus on variation in the pressure distribution on a surface. The difference between variants was in positioning the blowing hole on the cylinder circumference in the mean cross section. The paper describes the influence of the hole position on the pressure distribution for a case of interaction between a supersonic free stream and a jet. New experimental data on a pressure distribution on a circular cylinder surface with at different positions of the blow hole are now available.</p></div>","PeriodicalId":800,"journal":{"name":"Thermophysics and Aeromechanics","volume":"33 1","pages":"23 - 34"},"PeriodicalIF":0.5,"publicationDate":"2026-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148614098","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
Formation of dynamic and thermal boundary layers in a methane pyrolysis with variable viscosity and thermal diffusivity 变黏度和热扩散率甲烷热解过程中动力边界层和热边界层的形成
IF 0.5 4区 工程技术
Thermophysics and Aeromechanics Pub Date : 2026-07-25 DOI: 10.1134/S0869864326010129
K. V. Kolotilkina, S. V. Zaitsev, E. V. Stephanyuk, V. A. Kudinov
{"title":"Formation of dynamic and thermal boundary layers in a methane pyrolysis with variable viscosity and thermal diffusivity","authors":"K. V. Kolotilkina,&nbsp;S. V. Zaitsev,&nbsp;E. V. Stephanyuk,&nbsp;V. A. Kudinov","doi":"10.1134/S0869864326010129","DOIUrl":"10.1134/S0869864326010129","url":null,"abstract":"<div><p>The integral method of heat balance was applied for analytical solutions of a problem about forming dynamic and thermal boundary layers in a pyrolysis reactor (thermal decomposition of methane) with the conditions of variable viscosity and thermal diffusivity values (variable within the layers span). It was demonstrated that a layer of quiescent gas at the wall temperature on the inner surface of reactor wall is heated up to a temperature of 1000 °C (this occurs due to a high viscosity and a high thermal diffusivity within these layers). The isotaches and isotherms in this layer are oriented normal to the wall surface. In this case, boundary layers are formed at a certain distance from the wall. Within this layer, the velocity is almost zero, and the layer temperature equals the wall temperature (exceeding the gas temperature beyond the layers). At high temperatures, the nearwall layer of gas at rest is a place for intense production of carbon (the pyrolytic graphite) which deposits on the reactor walls up to a total carbon-based plugging of the reactor cross-section and the halt in pyrolysis process.</p></div>","PeriodicalId":800,"journal":{"name":"Thermophysics and Aeromechanics","volume":"33 1","pages":"101 - 107"},"PeriodicalIF":0.5,"publicationDate":"2026-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148614278","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
Development of methods for controlling the processes of liquid hydrocarbon combustion in an atmospheric burner using steam 利用蒸汽控制常压燃烧器中液态烃燃烧过程的方法的发展
IF 0.5 4区 工程技术
Thermophysics and Aeromechanics Pub Date : 2026-07-25 DOI: 10.1134/S0869864326010105
M. A. Tarulin, E. P. Kopyev
{"title":"Development of methods for controlling the processes of liquid hydrocarbon combustion in an atmospheric burner using steam","authors":"M. A. Tarulin,&nbsp;E. P. Kopyev","doi":"10.1134/S0869864326010105","DOIUrl":"10.1134/S0869864326010105","url":null,"abstract":"<div><p>This study is aimed at improving environmental efficiency by establishing the dependence of parameters of optimal combustion of liquid hydrocarbon fuels (diesel fuel, crude oil, fuel oil, kerosene, waste oil) on their physical properties using atomization with superheated steam. The methodology includes the construction of regime maps of CO concentration with approximation by radial basis functions and smoothing by a median filter. During the study, a statistically significant linear relationship between the angular coefficients of the optimal regime equations and the Laplace number (<i>r</i> = 0.834, <i>R</i> = 0.7) was established. Based on the obtained dependences, an equation is proposed to calculate the optimal flow rate of superheated steam depending on the Laplace number for the optimal combustion of liquid hydrocarbon fuels in an atmospheric burner with steam atomization and a gasification chamber to reduce emissions of harmful substances.</p></div>","PeriodicalId":800,"journal":{"name":"Thermophysics and Aeromechanics","volume":"33 1","pages":"85 - 91"},"PeriodicalIF":0.5,"publicationDate":"2026-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148614101","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 vapor-gas bubble motion inside a supercavity 超空腔内汽-气泡运动的研究
IF 0.5 4区 工程技术
Thermophysics and Aeromechanics Pub Date : 2026-07-25 DOI: 10.1134/S0869864326010191
A. Yu. Kravtsova, D. V. Litvinova, D. F. Sikovsky, S. G. Skripkin
{"title":"Study of vapor-gas bubble motion inside a supercavity","authors":"A. Yu. Kravtsova,&nbsp;D. V. Litvinova,&nbsp;D. F. Sikovsky,&nbsp;S. G. Skripkin","doi":"10.1134/S0869864326010191","DOIUrl":"10.1134/S0869864326010191","url":null,"abstract":"<div><p>The supercavities were studied in a slit channel with a hydrofoil inside. The hydrofoil attack angle was 21°. The dynamics of tracing flat cavitation bubbles in a slit channel were studied using a high-speed visualization with algorithmic diagnostics method. The methods of an algorithmic diagnostics of a two-phase flow were used to detect the size of bubbles, their velocity, direction of bubbles movement and spatial distribution. There are three types of supercavity patterns arising in slit channels: a transparent pulsating cavity with periodic vortex formation at the site of its closure; a steam and a steam-water mixture coexisting inside the cavity; a cavity completely filled with liquid with tracing vapor-gas bubbles inside. It is determined that the bubbles move inside supercavity from its boundaries to the center; further they move to the front of the cavity and merge with it. The maximum velocity of bubbles is half the velocity of the oncoming flow.</p></div>","PeriodicalId":800,"journal":{"name":"Thermophysics and Aeromechanics","volume":"33 1","pages":"151 - 155"},"PeriodicalIF":0.5,"publicationDate":"2026-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148614274","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
Numerical study of laminar conical flame stability with different thermal conditions at the nozzle wall 喷嘴壁面不同热条件下锥形层流火焰稳定性的数值研究
IF 0.5 4区 工程技术
Thermophysics and Aeromechanics Pub Date : 2026-07-25 DOI: 10.1134/S0869864326010142
D. A. Slastnaya, M. Yu. Hrebtov
{"title":"Numerical study of laminar conical flame stability with different thermal conditions at the nozzle wall","authors":"D. A. Slastnaya,&nbsp;M. Yu. Hrebtov","doi":"10.1134/S0869864326010142","DOIUrl":"10.1134/S0869864326010142","url":null,"abstract":"<div><p>The paper presents a direct numerical simulation of a laminar premixed methane-air flame using a detailed kinetic mechanism. In this study, the numerical solver laminarSMOKE has been extended by a module for conjugate heat transfer between the flame and nozzle walls. Switching the isothermal boundary condition at the nozzle wall to the conjugated heat transfer condition results in a higher temperature of the nozzle exit edge, a reduction in a gas density gradient near the nozzle exit and a reduction in the low-frequency oscillations of the flame caused by the buoyancy force.</p></div>","PeriodicalId":800,"journal":{"name":"Thermophysics and Aeromechanics","volume":"33 1","pages":"115 - 120"},"PeriodicalIF":0.5,"publicationDate":"2026-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148614053","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
Propeller effects on the aerodynamic performance of a quadcopter fuselage 螺旋桨对四轴飞行器机身气动性能的影响
IF 0.5 4区 工程技术
Thermophysics and Aeromechanics Pub Date : 2026-07-25 DOI: 10.1134/S0869864326010075
P. A. Polivanov, G. A. Berkon
{"title":"Propeller effects on the aerodynamic performance of a quadcopter fuselage","authors":"P. A. Polivanov,&nbsp;G. A. Berkon","doi":"10.1134/S0869864326010075","DOIUrl":"10.1134/S0869864326010075","url":null,"abstract":"<div><p>Multi-rotor aerial vehicles have the rather short history of active usage, so many aspects of vehicle aerodynamics remain poorly investigated. One such area is the impact of propeller-generated flows on multi-rotor airframe and fuselage components. The paper studies the effects of propeller on the aerodynamic drag coefficient and the sideforce acting on the fuselage of a meteorology drone (with a spherical shape). Numerical simulations were performed using the RANS approach with a direct account for the rotor rotation. The numerical results are verified on the basis of PIV-measurements. The results indicate that the aerodynamic performance of the quadcopter fuselage depends significantly on the unsteady flow field generated by the propellers.</p></div>","PeriodicalId":800,"journal":{"name":"Thermophysics and Aeromechanics","volume":"33 1","pages":"61 - 65"},"PeriodicalIF":0.5,"publicationDate":"2026-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148614276","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
Thermal conductivity of magnesium-lithium alloys with a body-centered cubic crystal lattice in the temperature range of 80 – 350 K 体心立方晶格镁锂合金在80 ~ 350 K温度范围内的热导率
IF 0.5 4区 工程技术
Thermophysics and Aeromechanics Pub Date : 2026-07-25 DOI: 10.1134/S0869864326010221
V. A. Nepomnyashchikh, R. N. Abdullaev
{"title":"Thermal conductivity of magnesium-lithium alloys with a body-centered cubic crystal lattice in the temperature range of 80 – 350 K","authors":"V. A. Nepomnyashchikh,&nbsp;R. N. Abdullaev","doi":"10.1134/S0869864326010221","DOIUrl":"10.1134/S0869864326010221","url":null,"abstract":"<div><p>Thermal conductivity of solid magnesium-lithium alloys with <i>X</i><sub>Li</sub> = 35, 40, 50 at. % in the temperature range of 80 – 350 K was measured by a transient plane source method. The obtained results were compared with literature data for alloys of other compositions. For all the studied alloys, anomalous behavior in the form of a kink in the range of 310 – 330 K and a feature near 240 K, presumably associated with a martensitic transformation, was found on temperature dependences <i>λ</i>(<i>T</i>). Using literature data, concentration dependences of thermal conductivity of the Mg-Li system were plotted in the range <i>X</i><sub>Li</sub> = 0 – 50 at. %. It is shown that an increase in the lithium content in the range of 30 – 50 at. % leads to a further decrease in thermal conductivity.</p></div>","PeriodicalId":800,"journal":{"name":"Thermophysics and Aeromechanics","volume":"33 1","pages":"189 - 195"},"PeriodicalIF":0.5,"publicationDate":"2026-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148614277","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
Cooling of a laser-modified surface with a dispersed flow of coolant 用分散的冷却剂流冷却激光修饰表面
IF 0.5 4区 工程技术
Thermophysics and Aeromechanics Pub Date : 2026-07-25 DOI: 10.1134/S0869864326010051
V. S. Shteling, A. T. Komov, P. P. Shcherbakov, A. V. Zakharchenkov, A. S. Filakov
{"title":"Cooling of a laser-modified surface with a dispersed flow of coolant","authors":"V. S. Shteling,&nbsp;A. T. Komov,&nbsp;P. P. Shcherbakov,&nbsp;A. V. Zakharchenkov,&nbsp;A. S. Filakov","doi":"10.1134/S0869864326010051","DOIUrl":"10.1134/S0869864326010051","url":null,"abstract":"<div><p>The paper deals with the study of heat transfer intensification during cooling of a surface treated by laser with a dispersed coolant flow. A laser ablation technique using a pulsed laser is described; this treatment leads to the formation of craters of up to 600 µm in diameter on a copper surface with the following roughness parameters: <i>R</i><sub><i>a</i></sub> = 1.48 µm, <i>R</i><sub><i>z</i></sub> = 9.8 µm. The results demonstrate an increase in the removed heat flux by 35–40 %, the heat transfer coefficient by 38–55 % at intense boiling (115–125 °C) compared to the unmodified surface. The proportion of heat removed due to the phase transition reaches 90 % at a removed heat flux density of 8.4 MW/m<sup>2</sup> on the modified surface.</p></div>","PeriodicalId":800,"journal":{"name":"Thermophysics and Aeromechanics","volume":"33 1","pages":"47 - 53"},"PeriodicalIF":0.5,"publicationDate":"2026-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148614102","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
Thermal calculation for a methane pyrolysis installation 甲烷热解装置的热计算
IF 0.5 4区 工程技术
Thermophysics and Aeromechanics Pub Date : 2026-07-25 DOI: 10.1134/S0869864326010117
V. D. Dolgikh
{"title":"Thermal calculation for a methane pyrolysis installation","authors":"V. D. Dolgikh","doi":"10.1134/S0869864326010117","DOIUrl":"10.1134/S0869864326010117","url":null,"abstract":"<div><p>An installation was designed, manufactured and tested for methane pyrolysis and hydrogen production. Methane heating and pyrolysis occurs due to burning a fraction of methane-hydrogen mixture (60 % hydrogen and 40 % methane) produced by pyrolysis (a return for the plant demand). The installation thermal design was performed with the account for the heat consumed for pyrolysis, insulation heat loss and losses with flue gases. The study determined the plant heat power and the efficiency coefficient. Usage of methane-hydrogen mixture as a fuel allows reducing the CO<sub>2</sub> emission as compared to known methods of hydrogen production.</p></div>","PeriodicalId":800,"journal":{"name":"Thermophysics and Aeromechanics","volume":"33 1","pages":"93 - 100"},"PeriodicalIF":0.5,"publicationDate":"2026-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148614169","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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