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Global stability analysis of isothermal swirling flow in a model combustion chamber 模型燃烧室等温旋流的全局稳定性分析
IF 0.5 4区 工程技术
Thermophysics and Aeromechanics Pub Date : 2026-07-25 DOI: 10.1134/S086986432601018X
I. I. Lutchenko, A. V. Proskurin, E. V. Palkin, R. I. Mullyadzhanov, S. V. Alekseenko
{"title":"Global stability analysis of isothermal swirling flow in a model combustion chamber","authors":"I. I. Lutchenko,&nbsp;A. V. Proskurin,&nbsp;E. V. Palkin,&nbsp;R. I. Mullyadzhanov,&nbsp;S. V. Alekseenko","doi":"10.1134/S086986432601018X","DOIUrl":"10.1134/S086986432601018X","url":null,"abstract":"<div><p>This paper presents the linear stability analysis of a swirling flow in a model combustion chamber. The flow features a strongly coherent component associated with vortex core precession. Global stability analysis was performed on the mean field obtained via the large eddy simulations, incorporating turbulent viscosity. The eigenvalue spectrum revealed a mode with a dimensionless frequency of 0.76. Its eigenfunction distributions indicated that this mode corresponds to a precessing vortex core (PVC). These findings confirms that the PVC is a global unstable mode developing in a mean turbulent flow and will serve as a basis for further work on the development of PVC control strategies.</p></div>","PeriodicalId":800,"journal":{"name":"Thermophysics and Aeromechanics","volume":"33 1","pages":"143 - 149"},"PeriodicalIF":0.5,"publicationDate":"2026-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148614271","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 a separation vortex in a supersonic flow around a dihedral model for the angle of attack within α = 0 – 24° 攻角在α = 0 ~ 24°范围内的二面体模型超声速流动分离涡的发展
IF 0.5 4区 工程技术
Thermophysics and Aeromechanics Pub Date : 2026-07-25 DOI: 10.1134/S0869864326010208
A. I. Maksimov, I. N. Kavun
{"title":"Development of a separation vortex in a supersonic flow around a dihedral model for the angle of attack within α = 0 – 24°","authors":"A. I. Maksimov,&nbsp;I. N. Kavun","doi":"10.1134/S0869864326010208","DOIUrl":"10.1134/S0869864326010208","url":null,"abstract":"<div><p>The emergence and development of a vortex system during separation of a supersonic airflow on a rib of a dihedral model with the opening angle of 270° was studied in details. The appearance of a separation vortex above the side face was detected for a flow with an angle of attack <i>α</i> = 1°. For a case with <i>α</i> &gt; 2°, boundary-layer separation occurs near the rib of the corner configuration. With an increase in pressure drop between the top and side faces of the model, the separation flow size grows and at an angle <i>α</i> = 3.7° a new vortex is observed (a secondary vortex). For a flow with an angle of attack <i>α</i> = 8°, a third vortex is clearly observed. This vortex is located above the secondary vortex and it has a minor influence on the pressure distribution and the limiting streamlines behavior on the side face. The flow at this angle of attack <i>α</i> results in repeated separations for thin boundary layers (near the configuration rib and beneath the enlarged secondary vortex). Within the tested interval of the angle of attack <i>α</i> = 8° – 24°, the sizes of those local separations remain almost the same. It was shown that analysis of limiting streamlines patterns and the surface pressure distribution cannot fully elucidate the actual structure of a complex vortex system without gaining some additional data.</p></div>","PeriodicalId":800,"journal":{"name":"Thermophysics and Aeromechanics","volume":"33 1","pages":"157 - 170"},"PeriodicalIF":0.5,"publicationDate":"2026-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148614272","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 low-concentration surfactants on characteristics of gas bubbles in a gas-liquid flow in an inclined channel 低浓度表面活性剂对倾斜通道气液流动气泡特性的影响
IF 0.5 4区 工程技术
Thermophysics and Aeromechanics Pub Date : 2026-07-25 DOI: 10.1134/S086986432601004X
A. O. Karhov, M. A. Vorobyev
{"title":"Influence of low-concentration surfactants on characteristics of gas bubbles in a gas-liquid flow in an inclined channel","authors":"A. O. Karhov,&nbsp;M. A. Vorobyev","doi":"10.1134/S086986432601004X","DOIUrl":"10.1134/S086986432601004X","url":null,"abstract":"<div><p>Experiments were conducted on bubble motion in an inclined tube with a cocurrent liquid flow. The study determined the influence of surfactant concentrations, tube inclination angle and flow velocity on the gas bubble sizes and bubble uprising velocity. It was found that a combination of liquid flow and a surfactant suppresses the bubble coalescence. Under the specific conditions, the drag coefficient for a buoyant bubble in the nearwall flow was calculated. This drag coefficient is proportional to the Weber number both for a bubble in pure water and in water with surfactant.</p></div>","PeriodicalId":800,"journal":{"name":"Thermophysics and Aeromechanics","volume":"33 1","pages":"41 - 46"},"PeriodicalIF":0.5,"publicationDate":"2026-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148614056","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
Aerothermochemical interaction between a hypersonic flow and surfaces with different geometries 高超声速气流与不同几何形状表面之间的气热化学相互作用
IF 0.5 4区 工程技术
Thermophysics and Aeromechanics Pub Date : 2026-07-25 DOI: 10.1134/S086986432601021X
N. I. Sidnyaev, L. S. Sklyarinsky
{"title":"Aerothermochemical interaction between a hypersonic flow and surfaces with different geometries","authors":"N. I. Sidnyaev,&nbsp;L. S. Sklyarinsky","doi":"10.1134/S086986432601021X","DOIUrl":"10.1134/S086986432601021X","url":null,"abstract":"<div><p>The paper presents theoretical models for aerothermochemical interaction between the streamlined surface and dissociated air for the case of combustion and sublimation near a frontal critical point of a blunt body. The methods and results were generalized for obtaining a solution based on the similarity method for the case of combustion and sublimation. The approach is based on an example of graphite in an arbitrary cross-section of cone, sphere, wedge, cylinder, plate, and a spherical cone for a case of a laminar flow with a high Reynolds number. For a hypersonic flow past bodies with various geometry shapes, calculations for mass flux, heat flux and drag coefficient were presented. The results are linked through universal dependencies expressed through stagnation enthalpy, pressure, velocity gradient, pressure gradient and surface temperature.</p></div>","PeriodicalId":800,"journal":{"name":"Thermophysics and Aeromechanics","volume":"33 1","pages":"171 - 187"},"PeriodicalIF":0.5,"publicationDate":"2026-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148614097","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
Quantum vortices in the Bose–Einstein condensate. Reconnection and motion equations 玻色-爱因斯坦凝聚中的量子漩涡。重连和运动方程
IF 0.5 4区 工程技术
Thermophysics and Aeromechanics Pub Date : 2026-07-25 DOI: 10.1134/S0869864326010087
S. K. Nemirovskii
{"title":"Quantum vortices in the Bose–Einstein condensate. Reconnection and motion equations","authors":"S. K. Nemirovskii","doi":"10.1134/S0869864326010087","DOIUrl":"10.1134/S0869864326010087","url":null,"abstract":"<div><p>The paper describes several features of vortex filaments in a weakly non-ideal Bose-Einstein condensate (BEC) with a counterflow. The study focuses on a process of reconnection and equations of motion. A primary motivation of this study is a fact that quantum vortex dynamics for superfluid helium was obtained previously at a phenomenological level. But some critical problems can be solved through a study of a corresponding problem in BEC. By considering a vortex filament as a crossing line for surfaces where the real and imaginary parts of a macroscopic wave function <i>ψ</i>(<b>r</b>, <i>t</i>) turn into zero, we derived the equations of motion for a vortex filament. It is remarkable that the equation structure coincides completely with a structure of equation for vortex filament dynamics in superfluid helium that has been obtained from other (phenomenological) foundations.</p></div>","PeriodicalId":800,"journal":{"name":"Thermophysics and Aeromechanics","volume":"33 1","pages":"67 - 73"},"PeriodicalIF":0.5,"publicationDate":"2026-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148614099","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
Calculation of plasma parameters around a chain of dust particles with a vacancy 带空位的尘埃粒子链周围等离子体参数的计算
IF 0.5 4区 工程技术
Thermophysics and Aeromechanics Pub Date : 2026-07-25 DOI: 10.1134/S0869864326010166
M. V. Salnikov, A. V. Fedoseev, M. M. Vasiliev, O. F. Petrov
{"title":"Calculation of plasma parameters around a chain of dust particles with a vacancy","authors":"M. V. Salnikov,&nbsp;A. V. Fedoseev,&nbsp;M. M. Vasiliev,&nbsp;O. F. Petrov","doi":"10.1134/S0869864326010166","DOIUrl":"10.1134/S0869864326010166","url":null,"abstract":"<div><p>A multiblock numerical model was used to study the phenomenon of vacancy formation in a chain of dust particles. Self-consistent spatial distributions of the space charge and electric potential around the dust particles for two cases were obtained by means of numerical calculations: a linear chain of five particles and a chain of four particles with a vacancy. The equilibrium charges of particles and the magnitudes of the main forces acting on them (the ion drag force, the Coulomb force of particle repulsion, and the force exerted by an external electric field on charged particles) were calculated. It was shown that vacancy formation, without changing the structural parameters of the chain, occurs under conditions of strong ion trails, with the fourth and fifth particles in the strong ion trail of the second particle.</p></div>","PeriodicalId":800,"journal":{"name":"Thermophysics and Aeromechanics","volume":"33 1","pages":"131 - 136"},"PeriodicalIF":0.5,"publicationDate":"2026-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148614273","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 observation of a swirling flow with a double precessing vortex 双进动涡旋流的实验观察
IF 0.5 4区 工程技术
Thermophysics and Aeromechanics Pub Date : 2026-07-25 DOI: 10.1134/S0869864326010178
S. G. Skripkin, V. D. Skuratov, D. A. Suslov, S. I. Shtork
{"title":"Experimental observation of a swirling flow with a double precessing vortex","authors":"S. G. Skripkin,&nbsp;V. D. Skuratov,&nbsp;D. A. Suslov,&nbsp;S. I. Shtork","doi":"10.1134/S0869864326010178","DOIUrl":"10.1134/S0869864326010178","url":null,"abstract":"<div><p>This paper describes a new phenomenon of generating a stable double precessing vortex in a highly swirling turbulent flow. It also identifies the range of flow conditions providing the clearest observation of this effect. It also identifies key features of the internal flow structure and the kinematic scheme of the double vortex precessional motion. The geometric parameters of the helical vortex are measured depending on the flow regime. The obtained results are important not only from a practical standpoint for the possibilities of controlling the flow structure in industrial apparatuses, but also from the standpoint of fundamental problems in vortex dynamics. Precession of a helical structure represents a canonical case of self-induced motion of a vortex filament with a helical axis of rotation.</p></div>","PeriodicalId":800,"journal":{"name":"Thermophysics and Aeromechanics","volume":"33 1","pages":"137 - 141"},"PeriodicalIF":0.5,"publicationDate":"2026-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148614280","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 the intensity of thermal gravity-capillary convection on temperature fields in thin walls 热重-毛细对流强度对薄壁温度场的影响
IF 0.5 4区 工程技术
Thermophysics and Aeromechanics Pub Date : 2026-07-25 DOI: 10.1134/S0869864326010063
A. V. Mikhaylov, V. S. Berdnikov, V. A. Grishkov, N. M. Rybin, E. A. Yurovskikh
{"title":"Influence of the intensity of thermal gravity-capillary convection on temperature fields in thin walls","authors":"A. V. Mikhaylov,&nbsp;V. S. Berdnikov,&nbsp;V. A. Grishkov,&nbsp;N. M. Rybin,&nbsp;E. A. Yurovskikh","doi":"10.1134/S0869864326010063","DOIUrl":"10.1134/S0869864326010063","url":null,"abstract":"<div><p>The development of non-stationary thermal gravity-capillary convection in a layer of ethyl alcohol with a free surface after sudden electric heating of one of the vertical walls of a rectangular cavity was experimentally studied. The effect of a heated liquid flow along the free surface onto the opposite thin metal wall of the cavity was studied. The influence of the liquid layer heights and heat flux densities on the heated wall of the cavity was investigated. Temperature fields on the thin wall and on the free surface of the liquid layer were measured using a FLIR x6530sc thermal imager. Computer processing of thermal imaging films allowed the construction of distributions of temperature and temperature gradients along the wall height depending on time. The amplitude-frequency characteristics of temperature pulsations associated with the occurrence of secondary flows in the heated liquid flow on the wall were determined, and their effect on instantaneous temperature fields on the wall was studied against the background of a monotonic change.</p></div>","PeriodicalId":800,"journal":{"name":"Thermophysics and Aeromechanics","volume":"33 1","pages":"55 - 60"},"PeriodicalIF":0.5,"publicationDate":"2026-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148614052","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
Phenomenological approach to finding the critical indices for 3D percolation in multifractal media 多重分形介质中三维渗流临界指标的现象学研究
IF 0.5 4区 工程技术
Thermophysics and Aeromechanics Pub Date : 2026-06-27 DOI: 10.1134/S0869864325060149
B. P. Kolesnikov
{"title":"Phenomenological approach to finding the critical indices for 3D percolation in multifractal media","authors":"B. P. Kolesnikov","doi":"10.1134/S0869864325060149","DOIUrl":"10.1134/S0869864325060149","url":null,"abstract":"<div><p>The percolation theory is applied widely to the study of heat transfer and other kinetic processes in systems with disordered structures. This paper develops a phenomenological approach that combines the percolation theory methods and multifractal analysis to model a percolation cluster in 3D infinite medium with multifractal properties. The developed model gives unambiguous numerical values for topology-critical indices and a critical conductivity index. The model reveals new relations between critical indices and defines the threshold conditions that separate the qualitatively-different modes of system behavior in the correlation length scales. The system order parameter has a relation with the golden ratio and this indicates a universal nature of the found relationships.</p></div>","PeriodicalId":800,"journal":{"name":"Thermophysics and Aeromechanics","volume":"32 6","pages":"1313 - 1325"},"PeriodicalIF":0.5,"publicationDate":"2026-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148323868","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 taking into account strong anisotropic scattering using a modified method of average fluxes 用改进的平均通量法考虑强各向异性散射
IF 0.5 4区 工程技术
Thermophysics and Aeromechanics Pub Date : 2026-06-27 DOI: 10.1134/S0869864325060113
A. M. Timofeev
{"title":"On taking into account strong anisotropic scattering using a modified method of average fluxes","authors":"A. M. Timofeev","doi":"10.1134/S0869864325060113","DOIUrl":"10.1134/S0869864325060113","url":null,"abstract":"<div><p>A numerical analysis of highly asymmetric scattering phase functions was performed using a modified method of average fluxes. To solve the radiative transfer equation, the delta-Eddington approximation is used. As an example, radiative-conductive heat transfer in a flat layer of an anisotropically scattering medium was calculated for the Henyey – Greenstein phase function and the transport approximation.</p></div>","PeriodicalId":800,"journal":{"name":"Thermophysics and Aeromechanics","volume":"32 6","pages":"1291 - 1298"},"PeriodicalIF":0.5,"publicationDate":"2026-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148323869","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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