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Asymptotic decay of a far momentumless turbulent wake behind a sphere in an isotropic turbulent flow 各向同性湍流中球体后无动量湍流尾流的渐近衰减
IF 0.5 4区 工程技术
Thermophysics and Aeromechanics Pub Date : 2024-10-17 DOI: 10.1134/S0869864324020033
A. G. Demenkov, G. G. Chernykh
{"title":"Asymptotic decay of a far momentumless turbulent wake behind a sphere in an isotropic turbulent flow","authors":"A. G. Demenkov,&nbsp;G. G. Chernykh","doi":"10.1134/S0869864324020033","DOIUrl":"10.1134/S0869864324020033","url":null,"abstract":"<div><p>Numerical simulation of the final viscous stage of degeneration of a momentumless turbulent wake behind a sphere in an isotropic turbulent flow is performed using a modified <i>e</i> ∼ <i>ε</i> turbulence model. The laws of degeneration are consistent with those for a momentumless turbulent wake at absent turbulent background.</p></div>","PeriodicalId":800,"journal":{"name":"Thermophysics and Aeromechanics","volume":"31 2","pages":"227 - 234"},"PeriodicalIF":0.5,"publicationDate":"2024-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142443190","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 studies of the icing effect on flow kinematics and power characteristics of wind generator blades using laser Doppler anemometry methods 利用激光多普勒风速测量法对结冰对风力发电机叶片流动运动学和动力特性的影响进行实验研究
IF 0.5 4区 工程技术
Thermophysics and Aeromechanics Pub Date : 2024-10-17 DOI: 10.1134/S0869864324020045
V. G. Meledin, I. K Kabardin, S. V. Dvoynishnikov, K. I. Stepanov, D. G. Mukhin, M. R. Gordienko, S. V. Kakaulin, V. E. Ledovsky, K. S. Zubanov, V. O. Zuev, N. I. Yavorsky, G. V. Bakakin
{"title":"Experimental studies of the icing effect on flow kinematics and power characteristics of wind generator blades using laser Doppler anemometry methods","authors":"V. G. Meledin,&nbsp;I. K Kabardin,&nbsp;S. V. Dvoynishnikov,&nbsp;K. I. Stepanov,&nbsp;D. G. Mukhin,&nbsp;M. R. Gordienko,&nbsp;S. V. Kakaulin,&nbsp;V. E. Ledovsky,&nbsp;K. S. Zubanov,&nbsp;V. O. Zuev,&nbsp;N. I. Yavorsky,&nbsp;G. V. Bakakin","doi":"10.1134/S0869864324020045","DOIUrl":"10.1134/S0869864324020045","url":null,"abstract":"<div><p>The effect of icing on the kinematic and power parameters of the working element of a wind generator blade was experimentally studied using a modified laser Doppler anemometry method. Arctic conditions were modeled in a specially designed aerodynamic climatic setup based on an optically transparent plexiglass tube with a square cross section of 200×200 mm with the following parameters: flow velocity of up to 20 m/s, temperature of up to −20 °C, and relative humidity of up to 90 %. The flow was saturated with moisture by fine aerosol generators. Aerosol generator flows were optimized using laser Doppler anemometry. The following parameters were measured: flow velocities at distances of up to 400 mm behind the trailing edge of the blade and power characteristics of the blade element subjected to icing. The effect of icing on aerodynamic and power characteristics is shown.</p></div>","PeriodicalId":800,"journal":{"name":"Thermophysics and Aeromechanics","volume":"31 2","pages":"235 - 243"},"PeriodicalIF":0.5,"publicationDate":"2024-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142443326","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
A source of controlled nonstationary harmonic flow disturbances 受控非稳态谐波流干扰源
IF 0.5 4区 工程技术
Thermophysics and Aeromechanics Pub Date : 2024-07-29 DOI: 10.1134/S0869864324010049
T. A. Gimon, D. A. Elistratov, A. D. Zhelonkin, S. V. Lukashevich, S. O. Morozov, A. N. Shiplyuk
{"title":"A source of controlled nonstationary harmonic flow disturbances","authors":"T. A. Gimon,&nbsp;D. A. Elistratov,&nbsp;A. D. Zhelonkin,&nbsp;S. V. Lukashevich,&nbsp;S. O. Morozov,&nbsp;A. N. Shiplyuk","doi":"10.1134/S0869864324010049","DOIUrl":"10.1134/S0869864324010049","url":null,"abstract":"<div><p>The flow in the vicinity of the source of controlled harmonic non-stationary perturbations of a gas medium, applicable for generating Görtler vortices in a compressible boundary layer, is studied. The source has a flat surface with linearly arranged cylindrical channels, leading alternately to two cavities of variable volume. Various configurations of the source are considered: with separate channel outlet openings and with a slit opening above them. Numerical simulation is performed in the Solid Works Flow Simulation package, and experimental measurement of gas velocity is realized by the PIV method. The developed source is shown to create periodic velocity fluctuations with an amplitude of up to 2 m/s at a frequency of 1 kHz near the surface. The shapes of the profiles of velocity normal to the surface along the source are close to sinusoidal in both time and space.</p></div>","PeriodicalId":800,"journal":{"name":"Thermophysics and Aeromechanics","volume":"31 1","pages":"37 - 48"},"PeriodicalIF":0.5,"publicationDate":"2024-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141869278","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
Determining the amplitude-frequency characteristics of the thermoanemometer + sensor system by laser pulse 通过激光脉冲确定温度计+传感器系统的幅频特性
IF 0.5 4区 工程技术
Thermophysics and Aeromechanics Pub Date : 2024-07-29 DOI: 10.1134/S086986432401013X
D. A. Bountin, O. I. Vishnyakov, P. A. Polivanov, A. A. Sidorenko, Yu. V. Gromyko
{"title":"Determining the amplitude-frequency characteristics of the thermoanemometer + sensor system by laser pulse","authors":"D. A. Bountin,&nbsp;O. I. Vishnyakov,&nbsp;P. A. Polivanov,&nbsp;A. A. Sidorenko,&nbsp;Yu. V. Gromyko","doi":"10.1134/S086986432401013X","DOIUrl":"10.1134/S086986432401013X","url":null,"abstract":"<div><p>An experimental method is proposed for determining the frequency response of a hot-wire and hot-film system using short-pulse laser action on a sensor. The possibility to obtain frequency response by this method is demonstrated. The frequency response is obtained from constant temperature anemometers of two manufacturers with two types of sensors: surface thin-film and wire.</p></div>","PeriodicalId":800,"journal":{"name":"Thermophysics and Aeromechanics","volume":"31 1","pages":"135 - 140"},"PeriodicalIF":0.5,"publicationDate":"2024-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141869284","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
Peculiarities of reducing the broadband transfer of vibration and working medium pulsation through vibration-isolating junctions of pipelines with liquid by constructive and active methods 通过建设性和主动性方法减少振动和工作介质脉动通过液体管道隔振连接处的宽带传递的特殊性
IF 0.5 4区 工程技术
Thermophysics and Aeromechanics Pub Date : 2024-07-29 DOI: 10.1134/S0869864324010128
A. V. Kiryukhin, O. O. Milman, A. V. Ptakhin, V. O. Miloserdov
{"title":"Peculiarities of reducing the broadband transfer of vibration and working medium pulsation through vibration-isolating junctions of pipelines with liquid by constructive and active methods","authors":"A. V. Kiryukhin,&nbsp;O. O. Milman,&nbsp;A. V. Ptakhin,&nbsp;V. O. Miloserdov","doi":"10.1134/S0869864324010128","DOIUrl":"10.1134/S0869864324010128","url":null,"abstract":"<div><p>It is shown that the vibration transfer and working medium pressure pulsations through vibration-isolating pipeline junctions of various plants may increase by two or three orders of magnitude with an increase in the vibration frequency and in the presence of incompressible working fluid. The results of research of the found physical models that determine this phenomenon are presented. The experimental results for a spatial three-component broadband active vibration-protection system (AVS) for vibration damping beyond the vibration isolation junction with liquid are considered. An experimental plant scheme for studying the simultaneous spatial active damping of dynamic forces, vibrations and pressure pulsations downstream from the junction has been given. Calculated dependences of the maximum efficiency of considered AVS on frequency are obtained. Efficient active damping of forces is shown to be attainable in an open loop without feedback. While damping in an open loop at the experimental plant, the efficiency of active damping of dynamic forces is obtained in three directions up to 10 dB or more in the frequency range from 5 to 800 Hz (more than seven octaves). The analysis of scientific publications reveals the uniqueness of this result. In this case, there are no zones of negative efficiency outside the active damping frequency range, which appear while using other methods of active damping.</p></div>","PeriodicalId":800,"journal":{"name":"Thermophysics and Aeromechanics","volume":"31 1","pages":"123 - 133"},"PeriodicalIF":0.5,"publicationDate":"2024-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141869283","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
Effect of the slot depth on supersonic boundary-layer stabilization 槽深对超音速边界层稳定的影响
IF 0.5 4区 工程技术
Thermophysics and Aeromechanics Pub Date : 2024-07-29 DOI: 10.1134/S0869864324010086
V. I. Lysenko, B. V. Smorodsky, A. D. Kosinov, A. A. Yatskikh
{"title":"Effect of the slot depth on supersonic boundary-layer stabilization","authors":"V. I. Lysenko,&nbsp;B. V. Smorodsky,&nbsp;A. D. Kosinov,&nbsp;A. A. Yatskikh","doi":"10.1134/S0869864324010086","DOIUrl":"10.1134/S0869864324010086","url":null,"abstract":"<div><p>Influence of streamwise slots with the orientation angle <i>φ</i> = 0 and various depths <i>h</i> (corresponding Reynolds number Re<sub><i>h</i></sub> = 0–2000) on the stability of the supersonic (M = 2) flat-plate boundary layer with relation to natural disturbances of the first (vorticity) instability mode driving laminar-turbulent transition was investigated experimentally. Experiments shown that such kind of disturbances can be stabilized by small-depth streamwise slots, wherein the maximum stabilization occurs at the Reynolds number (based on the slot depth) of about Re<sub><i>h</i></sub> ≈ 1000.</p></div>","PeriodicalId":800,"journal":{"name":"Thermophysics and Aeromechanics","volume":"31 1","pages":"71 - 78"},"PeriodicalIF":0.5,"publicationDate":"2024-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141873165","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
Comparison of air temperature at the level of the inner wall of vortex tubes with circular and square cross sections of the working channel 工作通道横截面为圆形和方形的涡流管内壁水平面的空气温度比较
IF 0.5 4区 工程技术
Thermophysics and Aeromechanics Pub Date : 2024-07-29 DOI: 10.1134/S0869864324010037
M. R. Gordienko, I. K. Kabardin, M. Kh. Pravdina, S. V. Kakaulin, V. I. Polyakova, V. G. Meledin, G. V. Bakakin, N. I. Yavorsky
{"title":"Comparison of air temperature at the level of the inner wall of vortex tubes with circular and square cross sections of the working channel","authors":"M. R. Gordienko,&nbsp;I. K. Kabardin,&nbsp;M. Kh. Pravdina,&nbsp;S. V. Kakaulin,&nbsp;V. I. Polyakova,&nbsp;V. G. Meledin,&nbsp;G. V. Bakakin,&nbsp;N. I. Yavorsky","doi":"10.1134/S0869864324010037","DOIUrl":"10.1134/S0869864324010037","url":null,"abstract":"<div><p>The gas temperature measurements at the level of the inner wall of Ranque vortex tubes of the square and circular cross sections with variations in the cold mass fractions for both tubes showed the presence of three characteristic zones of temperature growth, which do not change over a wide range of the cold mass fraction. These zones are typical when analyzing the flow in a vortex tube within the framework of the flow crisis concept.</p></div>","PeriodicalId":800,"journal":{"name":"Thermophysics and Aeromechanics","volume":"31 1","pages":"29 - 35"},"PeriodicalIF":0.5,"publicationDate":"2024-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141869277","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
Influence of random statistical factors on dispersed particles motion in a two-phase flow: physical and mathematical modeling 随机统计因素对两相流中分散粒子运动的影响：物理和数学模型
IF 0.5 4区 工程技术
Thermophysics and Aeromechanics Pub Date : 2024-07-29 DOI: 10.1134/S0869864324010098
M. A. Abramov, K. Yu. Arefyev, A. V. Voronetskii, I. M. Grishin, S. V. Kruchkov
{"title":"Influence of random statistical factors on dispersed particles motion in a two-phase flow: physical and mathematical modeling","authors":"M. A. Abramov,&nbsp;K. Yu. Arefyev,&nbsp;A. V. Voronetskii,&nbsp;I. M. Grishin,&nbsp;S. V. Kruchkov","doi":"10.1134/S0869864324010098","DOIUrl":"10.1134/S0869864324010098","url":null,"abstract":"<div><p>The work is devoted to the study of random statistical processes in two-phase flows. The objective is to obtain new computational and experimental data on the influence of previously undetermined factors on the trajectories of particle motion, their segregation, and the formation of a locally continuous flow field of the dispersed phase in supersonic turbulent two-phase flows. The results of computational and experimental study of the flow features of a two-phase supersonic flow are presented. A new experimental method was applied for analysis of influence of random statistical factors on the particle distribution in a high-speed carrier flow. The physical basis of the proposed method is to indicate the flow rate of the dispersed phase by means of particle adhesion to an obstacle installed in the flow. In order to analyze the segregation of the dispersed phase in the flow, the approach of quasi-continuumization of individual particle trajectories is applied. The method obtains a locally continuous flow stress field for dispersed phase flow. Empirical coefficients resulting from the influence of random statistical factors on the motion of dispersed particles in a two-phase flow are determined. The obtained computational and experimental data clarify the prediction of the distribution and segregation of dispersed phase particles with a size of 15–40 microns in a supersonic free flow.</p></div>","PeriodicalId":800,"journal":{"name":"Thermophysics and Aeromechanics","volume":"31 1","pages":"79 - 93"},"PeriodicalIF":0.5,"publicationDate":"2024-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141869282","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
Features of the interaction of disturbances generated in the incoming flow with the leading edge of a straight wing 入流扰动与直翼前缘相互作用的特点
IF 0.5 4区 工程技术
Thermophysics and Aeromechanics Pub Date : 2024-07-29 DOI: 10.1134/S0869864324010013
M. M. Katasonov, V. V. Kozlov, D. S. Sboev, A. M. Sorokin
{"title":"Features of the interaction of disturbances generated in the incoming flow with the leading edge of a straight wing","authors":"M. M. Katasonov,&nbsp;V. V. Kozlov,&nbsp;D. S. Sboev,&nbsp;A. M. Sorokin","doi":"10.1134/S0869864324010013","DOIUrl":"10.1134/S0869864324010013","url":null,"abstract":"<div><p>In a model experiment, the process of interaction of an external artificial disturbance with the leading edge of a straight wing model was investigated. The characteristics and features of the development of boundary layer disturbances, generated as a result of the interaction of external disturbances, and the blunted leading edge of the wing model have been obtained. The research was carried out in a subsonic low-turbulence wind tunnel using a hot-wire anemometry method for detecting disturbances. Localized disturbances generated in the incoming flow were shown to induce longitudinal streaky structures in the boundary layer of the straight wing. High-frequency wave packets (precursors) appeared at the boundaries (fronts) of longitudinal structures. The dynamics of the development of wave packets and localized longitudinal structures in the boundary layer above the wing profile in a gradient flow was studied.</p></div>","PeriodicalId":800,"journal":{"name":"Thermophysics and Aeromechanics","volume":"31 1","pages":"1 - 14"},"PeriodicalIF":0.5,"publicationDate":"2024-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141869286","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
Studying the technology for destroying infected waste in low-temperature plasma 研究在低温等离子体中销毁受感染废物的技术
IF 0.5 4区 工程技术
Thermophysics and Aeromechanics Pub Date : 2024-07-29 DOI: 10.1134/S0869864324010189
A. S. Anshakov, P. V. Domarov, V. A. Faleev
{"title":"Studying the technology for destroying infected waste in low-temperature plasma","authors":"A. S. Anshakov,&nbsp;P. V. Domarov,&nbsp;V. A. Faleev","doi":"10.1134/S0869864324010189","DOIUrl":"10.1134/S0869864324010189","url":null,"abstract":"<div><p>The paper presents the experimental results on the disposal of infected medical waste using low-temperature plasma. It is shown that infected medical waste can be processed using plasma technology. During plasma destruction of these materials, their biological disinfection with production of chemically inert, safe slag is guaranteed.</p></div>","PeriodicalId":800,"journal":{"name":"Thermophysics and Aeromechanics","volume":"31 1","pages":"185 - 188"},"PeriodicalIF":0.5,"publicationDate":"2024-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141869290","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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