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Experimental study of the turbulent flow of an underexpanded jet 未充分膨胀喷流的湍流实验研究
IF 0.5 4区 工程技术
Thermophysics and Aeromechanics Pub Date : 2024-07-29 DOI: 10.1134/S0869864324010116
A. V. Sobolev
{"title":"Experimental study of the turbulent flow of an underexpanded jet","authors":"A. V. Sobolev","doi":"10.1134/S0869864324010116","DOIUrl":"10.1134/S0869864324010116","url":null,"abstract":"<div><p>Measurements of full pressure pulsations in the mixing layer of a supersonic, strongly underexposed jet were performed. The resulting pressure was converted into a longitudinal velocity, which allowed determining the main characteristics of the layer: its growth rate and thickness, longitudinal and transverse dimensions of disturbances, intensity, and spectral composition of turbulence. The layer under consideration was in a state of saturation, with a wide range of disturbances being realized within. The measured growth rate of the layer turned out to be four times higher than that calculated by a statistically generalized method. The intensity of disturbances of the longitudinal velocity component was determined in the considered layer by two groups of disturbances — low-frequency and high-frequency — with approximately equal inputs. From the analysis of the measurement results, it follows that the mass transfer across the layer is inversely proportional to the lengths of the vortices, and in the upper part of the frequency range of intense disturbances it is many times higher. The high mass transfer across the layer causes its intensive mixing and rapid growth rate.</p></div>","PeriodicalId":800,"journal":{"name":"Thermophysics and Aeromechanics","volume":"31 1","pages":"107 - 121"},"PeriodicalIF":0.5,"publicationDate":"2024-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141869291","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
Volumetric properties and coefficients of mutual diffusion of liquid alloys of alkali metals with lead and bismuth 碱金属与铅和铋的液态合金的体积特性和相互扩散系数
IF 0.5 4区 工程技术
Thermophysics and Aeromechanics Pub Date : 2024-07-29 DOI: 10.1134/S0869864324010165
R. A. Khairulin, R. N. Abdullaev, S. V. Stankus
{"title":"Volumetric properties and coefficients of mutual diffusion of liquid alloys of alkali metals with lead and bismuth","authors":"R. A. Khairulin,&nbsp;R. N. Abdullaev,&nbsp;S. V. Stankus","doi":"10.1134/S0869864324010165","DOIUrl":"10.1134/S0869864324010165","url":null,"abstract":"<div><p>In this review paper, using the example of AM–Pb and AM–Bi melts (AM is an alkali metal), modern ideas on the nature of chemical short-range order in liquid metal systems with partial ionic bonding are briefly presented. Generalization and analysis of the experimental data obtained by the authors on the volumetric properties and mutual diffusion in liquid alloys of alkali metals with lead and bismuth have been carried out. The behavior of these properties is shown to generally agree with existing simple models that assume the presence of ionic complexes in melts, which gradually dissociate with increasing temperature. At the same time, the need to refine the structure of polyanionic complexes in liquid AM–Bi systems is confirmed.</p></div>","PeriodicalId":800,"journal":{"name":"Thermophysics and Aeromechanics","volume":"31 1","pages":"161 - 174"},"PeriodicalIF":0.5,"publicationDate":"2024-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141869288","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
Application of optical visualization of the inner surface temperature of a thin-walled model in the flow in a hotshot wind tunnel 热风隧道流动中薄壁模型内表面温度的光学可视化应用
IF 0.5 4区 工程技术
Thermophysics and Aeromechanics Pub Date : 2024-07-29 DOI: 10.1134/S0869864324010050
I. S. Tsyryulnikov, T. A. Korotaeva, Yu. V. Gromyko, N. A. Maslov
{"title":"Application of optical visualization of the inner surface temperature of a thin-walled model in the flow in a hotshot wind tunnel","authors":"I. S. Tsyryulnikov,&nbsp;T. A. Korotaeva,&nbsp;Yu. V. Gromyko,&nbsp;N. A. Maslov","doi":"10.1134/S0869864324010050","DOIUrl":"10.1134/S0869864324010050","url":null,"abstract":"<div><p>A method of panoramic temperature measurement based on registering the fluorescence of thin-walled coatings on the inner surface of a flying vehicle model is considered. The method allows investigations in optically polluted flows of high-enthalpy short-duration wind tunnels. The temperature and heat fluxes on the aerodynamic model surface are retrieved by means of combining the results of temperature measurements with the numerical solution of an adjoint problem of the flow around the flying vehicle. Implementation of this method in practice is performed in the flow of a hotshot wind tunnel based at ITAM SB RAS.</p></div>","PeriodicalId":800,"journal":{"name":"Thermophysics and Aeromechanics","volume":"31 1","pages":"49 - 57"},"PeriodicalIF":0.5,"publicationDate":"2024-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141869279","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
Heat transfer enhancement and increase in critical heat flux during boiling on a biphilic silicon surface 双硅片表面沸腾时的传热增强和临界热通量增加
IF 0.5 4区 工程技术
Thermophysics and Aeromechanics Pub Date : 2024-07-29 DOI: 10.1134/S0869864324010190
I. P. Malakhov, V. S. Serdyukov, A. I. Safonov, A. A. Rodionov, S. V. Starinskiy, A. S. Surtaev
{"title":"Heat transfer enhancement and increase in critical heat flux during boiling on a biphilic silicon surface","authors":"I. P. Malakhov,&nbsp;V. S. Serdyukov,&nbsp;A. I. Safonov,&nbsp;A. A. Rodionov,&nbsp;S. V. Starinskiy,&nbsp;A. S. Surtaev","doi":"10.1134/S0869864324010190","DOIUrl":"10.1134/S0869864324010190","url":null,"abstract":"<div><p>The paper is concerned with an experimental study of heat transfer and boiling crisis development on a biphilic silicon surface made using a set of methods, including chemical vapor deposition and laser texturing. It is shown that the use of a biphilic surface with the proposed configuration of hydrophobic zones on a superhydrophilic base leads simultaneously to an increase in heat transfer by 60% and an increase in the critical heat flux by 76% as compared to an unmodified surface.</p></div>","PeriodicalId":800,"journal":{"name":"Thermophysics and Aeromechanics","volume":"31 1","pages":"189 - 192"},"PeriodicalIF":0.5,"publicationDate":"2024-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141873168","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 simulation of internal flows with three-dimensional swept interaction of shock waves 冲击波三维扫频相互作用的内部流动数值模拟
IF 0.5 4区 工程技术
Thermophysics and Aeromechanics Pub Date : 2024-07-29 DOI: 10.1134/S0869864324010104
I. I. Mazhul, Yu. P. Gounko
{"title":"Numerical simulation of internal flows with three-dimensional swept interaction of shock waves","authors":"I. I. Mazhul,&nbsp;Yu. P. Gounko","doi":"10.1134/S0869864324010104","DOIUrl":"10.1134/S0869864324010104","url":null,"abstract":"<div><p>Results of a numerical study of supersonic flows formed in channels with a square cross section are reported. Configurations consisting of a constricting entrance section formed by four compression wedges aligned at a right angle to each other and a subsequent channel with a constant cross section are considered. The initial shock waves formed on the nose compression wedges pairwise intersect each other in dihedral corners of the configuration along the swept lines, and a complex system of reflected and subsequent interacting shock waves of the general three-dimensional position is formed further downstream. The data are obtained in a supersonic range of freestream Mach numbers M = 2–4 for compression wedge angles of 3° and 8° in flows with both regular and irregular interaction of the initial shock waves in dihedral corners of the configuration.</p></div>","PeriodicalId":800,"journal":{"name":"Thermophysics and Aeromechanics","volume":"31 1","pages":"95 - 106"},"PeriodicalIF":0.5,"publicationDate":"2024-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141873167","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 cross-correlation characteristics of disturbances in the supersonic boundary layer of the plate at the influence of a pair of weak shock waves on the leading edge 受前缘一对弱冲击波影响时板块超音速边界层扰动的交叉相关特征
IF 0.5 4区 工程技术
Thermophysics and Aeromechanics Pub Date : 2024-07-29 DOI: 10.1134/S0869864324010025
L. V. Afanasev, A. A. Yatskikh, A. D. Kosinov, N. V. Semionov
{"title":"Features of the cross-correlation characteristics of disturbances in the supersonic boundary layer of the plate at the influence of a pair of weak shock waves on the leading edge","authors":"L. V. Afanasev,&nbsp;A. A. Yatskikh,&nbsp;A. D. Kosinov,&nbsp;N. V. Semionov","doi":"10.1134/S0869864324010025","DOIUrl":"10.1134/S0869864324010025","url":null,"abstract":"<div><p>The results of experimental measurements are presented to assess the correlation characteristics of disturbances in the boundary layer of a flat plate with a sharp leading edge and pulsations of the incoming flow in cases of natural pulsations and influence of an N-wave for Mach 2 on the leading edge. The parameters of the cross-correlation of signals from two constant-temperature anemometry (CTA) are obtained digitally. The frequency ranges with apparent correlation between the mass flow rate pulsations measured by the probes are determined.</p></div>","PeriodicalId":800,"journal":{"name":"Thermophysics and Aeromechanics","volume":"31 1","pages":"15 - 28"},"PeriodicalIF":0.5,"publicationDate":"2024-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141869276","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 type of thermal boundary conditions on heat transfer and skin-friction in a convergent channel 热边界条件类型对汇流槽传热和表皮摩擦的影响
IF 0.5 4区 工程技术
Thermophysics and Aeromechanics Pub Date : 2024-07-29 DOI: 10.1134/S0869864324010062
A. Yu. Sakhnov, K. V. Bryzgalov, V. S. Naumkin, K. S. Lebeda
{"title":"Effect of the type of thermal boundary conditions on heat transfer and skin-friction in a convergent channel","authors":"A. Yu. Sakhnov,&nbsp;K. V. Bryzgalov,&nbsp;V. S. Naumkin,&nbsp;K. S. Lebeda","doi":"10.1134/S0869864324010062","DOIUrl":"10.1134/S0869864324010062","url":null,"abstract":"<div><p>Investigation results on the airflow in a convergent channel with a hot bottom wall at a set constant heat flux or at a set constant wall temperature are presented. The numerical simulation was carried out in the OpenFOAM software using the <i>k-ω</i>-SST turbulence model. The verification of simulation results demonstrated a good agreement between the calculated data and the experimental velocity profiles and the thermal Stanton number. The study showed that an increase in the temperature of the convergent channel wall leads to the phenomenon of the streamwise velocity overshoot, suppression of turbulence and a decrease in the skin-friction coefficient and thermal Stanton number. In contrast to a zero pressure gradient flow, the type of thermal boundary conditions has a noticeable effect on the skin-friction and heat transfer in the convergent channel.</p></div>","PeriodicalId":800,"journal":{"name":"Thermophysics and Aeromechanics","volume":"31 1","pages":"59 - 66"},"PeriodicalIF":0.5,"publicationDate":"2024-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141869280","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 the reverse flow behind the Mach disk in an underexpanded supersonic jet 未充分膨胀超音速喷气机马赫盘后反向流的数值研究
IF 0.5 4区 工程技术
Thermophysics and Aeromechanics Pub Date : 2024-07-29 DOI: 10.1134/S0869864324010074
A. V. Kashkovsky, A. N. Kudryavtsev, A. A. Shershnev
{"title":"Numerical study of the reverse flow behind the Mach disk in an underexpanded supersonic jet","authors":"A. V. Kashkovsky,&nbsp;A. N. Kudryavtsev,&nbsp;A. A. Shershnev","doi":"10.1134/S0869864324010074","DOIUrl":"10.1134/S0869864324010074","url":null,"abstract":"<div><p>Numerical simulations of an underexpanded supersonic jet exhausting from a circular nozzle are reported. The study is performed in a three-dimensional formulation using two different approaches: Navier–Stokes equations and Direct Simulation Monte Carlo method. In both cases, a reverse flow zone is formed behind the Mach disk in the first shock cell. Thus, this phenomenon, which was previously observed in axisymmetric simulations, cannot be attributed to inaccuracies of approximation of these equations near the axis of symmetry.</p></div>","PeriodicalId":800,"journal":{"name":"Thermophysics and Aeromechanics","volume":"31 1","pages":"67 - 70"},"PeriodicalIF":0.5,"publicationDate":"2024-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141869281","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
Heat transfer control at impinging pulsed gas-drop flow in the regime of evaporative cooling 蒸发冷却机制下脉冲气滴流的传热控制
IF 0.5 4区 工程技术
Thermophysics and Aeromechanics Pub Date : 2024-07-29 DOI: 10.1134/S0869864324010141
V. I. Terekhov, P. N. Karpov, A. F. Serov
{"title":"Heat transfer control at impinging pulsed gas-drop flow in the regime of evaporative cooling","authors":"V. I. Terekhov,&nbsp;P. N. Karpov,&nbsp;A. F. Serov","doi":"10.1134/S0869864324010141","DOIUrl":"10.1134/S0869864324010141","url":null,"abstract":"<div><p>The experimental results on heat transfer when a pulsed multi-nozzle spray flows onto a vertical surface are presented. The behavior of the effective heat transfer coefficient averaged over time and over the entire heat transfer surface has been studied. The experiments were carried out in the regime of evaporative cooling at a constant temperature of the heat transfer surface <i>T</i><sub>w</sub> = 70°C. The duration of pulses for supplying the liquid phase of the spray <i>τ</i> and their repetition frequency <i>F</i> were varied in the experiments within wide limits: <i>τ</i> = 1–10 ms and <i>F</i> = 0.25–50 Hz. In addition, the effect of droplet phase flow rate on heat transfer was studied by changing the pressure in front of the nozzles (Δ<i>P</i><sub>L</sub> = 0.05–0.6 MPa). Preliminary studies have shown that heat transfer during spray impingement onto a surface can be strongly influenced by the co-supply of air due to turbulization of the wall layer and the return of droplets reflected from the surface. It has been established that the main factor determining the intensity of heat transfer when the spray flows onto the surface is the time-averaged mass velocity of the liquid phase. Using this value, generalization of experimental data on the heat transfer coefficient and the thermal efficiency parameter of a pulsed spray was achieved.</p></div>","PeriodicalId":800,"journal":{"name":"Thermophysics and Aeromechanics","volume":"31 1","pages":"141 - 152"},"PeriodicalIF":0.5,"publicationDate":"2024-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141869285","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
Exact self-similar solutions for radiative heat transfer equations in a kinetic model with regular mode 具有规则模式的动力学模型中辐射传热方程的精确自相似解
IF 0.5 4区 工程技术
Thermophysics and Aeromechanics Pub Date : 2024-07-29 DOI: 10.1134/S0869864324010153
V. V. Zaviyalov
{"title":"Exact self-similar solutions for radiative heat transfer equations in a kinetic model with regular mode","authors":"V. V. Zaviyalov","doi":"10.1134/S0869864324010153","DOIUrl":"10.1134/S0869864324010153","url":null,"abstract":"<div><p>The paper demonstrates a possibility of applying the known class of analytical self-similar solutions in the form of the traveling heat wave for a system of nonlinear integral-differential equations describing radiative transfer for non-stationary, quasi-stationary, and regular modes of solution behavior. The solutions are constructed for a kinetic model in the Cartesian geometry under the assumption of local thermodynamic equilibrium with specially chosen absorption and scattering coefficients. A test problem for different solution modes is provided.</p></div>","PeriodicalId":800,"journal":{"name":"Thermophysics and Aeromechanics","volume":"31 1","pages":"153 - 159"},"PeriodicalIF":0.5,"publicationDate":"2024-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141869287","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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