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Structure of a supersonic gas-liquid jet at high liquid concentrations 高液体浓度下超音速气液射流的结构
IF 0.5 4区 工程技术
Thermophysics and Aeromechanics Pub Date : 2024-03-20 DOI: 10.1134/S0869864323060069
V. M. Boiko, V. V. Lotov, A. Yu. Nesterov, S. V. Poplavski
{"title":"Structure of a supersonic gas-liquid jet at high liquid concentrations","authors":"V. M. Boiko,&nbsp;V. V. Lotov,&nbsp;A. Yu. Nesterov,&nbsp;S. V. Poplavski","doi":"10.1134/S0869864323060069","DOIUrl":"10.1134/S0869864323060069","url":null,"abstract":"<div><p>Supersonic gas-liquid jets of a coaxial atomizer at high liquid concentrations are studied experimentally. A complex of optical techniques is used for studying the droplet sizes: visualization and particle image velocimetry, laser Doppler anemometry, and Malvern Spraytec instrument. The research shows that the velocity and concentration profiles change with flow rate growth: an extended region with small droplet velocities appears behind the bow shock wave; in this case, the concentration decreases significantly slower than that at low liquid flow rates. A small increase in the jet energy at liquid flow rates greater than 100 l/h and a noticeable increase in the droplet size testify that the gas jet capabilities for breaking up the liquid in the described regimes are exhausted.</p></div>","PeriodicalId":800,"journal":{"name":"Thermophysics and Aeromechanics","volume":"30 6","pages":"1031 - 1042"},"PeriodicalIF":0.5,"publicationDate":"2024-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140228080","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
New method of molecular modeling of liquid transport coefficients 液体传输系数分子建模新方法
IF 0.5 4区 工程技术
Thermophysics and Aeromechanics Pub Date : 2024-03-20 DOI: 10.1134/S0869864323060057
V. Ya. Rudyak, E. V. Lezhnev
{"title":"New method of molecular modeling of liquid transport coefficients","authors":"V. Ya. Rudyak,&nbsp;E. V. Lezhnev","doi":"10.1134/S0869864323060057","DOIUrl":"10.1134/S0869864323060057","url":null,"abstract":"<div><p>The paper presents a method of molecular modeling of fluid transport coefficients, which is an alternative to the method of molecular dynamics. The transport coefficients are determined using fluctuation-dissipation theorems. The dynamics of molecules is calculated stochastically, with intermolecular forces being set using the appropriate created database. A distribution function of intermolecular forces is constructed and a formula is obtained for its analytical approximation. The method effectiveness is demonstrated by the example of calculating the viscosity and thermal conductivity coefficients of liquid argon and benzene. The obtained data are compared with the data of experimental and molecular dynamic modeling and their good agreement is established. With the same modeling accuracy, the developed method is shown to be significantly more time-efficient compared to the molecular dynamics method.</p></div>","PeriodicalId":800,"journal":{"name":"Thermophysics and Aeromechanics","volume":"30 6","pages":"1021 - 1030"},"PeriodicalIF":0.5,"publicationDate":"2024-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140225491","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 laminar supersonic boundary layer under the conditions of diffusive hydrogen-air flame and its stability 扩散氢气-空气火焰条件下的层流超音速边界层及其稳定性
IF 0.5 4区 工程技术
Thermophysics and Aeromechanics Pub Date : 2024-03-20 DOI: 10.1134/S0869864323060124
S. A. Gaponov, S. O. Morozov, A. N. Semenov
{"title":"A laminar supersonic boundary layer under the conditions of diffusive hydrogen-air flame and its stability","authors":"S. A. Gaponov,&nbsp;S. O. Morozov,&nbsp;A. N. Semenov","doi":"10.1134/S0869864323060124","DOIUrl":"10.1134/S0869864323060124","url":null,"abstract":"<div><p>The problem of hydrodynamic stability of a boundary layer with diffusion combustion is formulated in the Dan–Lin–Alekseev approximation and at constant Prandtl and Schmidt numbers; it is reduced to solving a system of the tenth-order ordinary differential equations with homogeneous boundary conditions. With Lewis numbers equal to unity, it may be lowered to the eighth order. In the inviscid approximation, the stability problem is reduced to the integration of a single second-order differential equation.</p><p>Based on the obtained stability equations and calculations of stationary flow parameters, the stability of a supersonic boundary layer with diffusive combustion on a permeable plate with hydrogen supply through its pores is studied for the first time by direct numerical modeling. With the Mach number M = 2, the possibility of flame flow stabilization is established using calculations. It is shown that within the framework of the inviscid theory of stability, it is possible to obtain quite reliable data on the maximum degrees of the growth of disturbances.</p></div>","PeriodicalId":800,"journal":{"name":"Thermophysics and Aeromechanics","volume":"30 6","pages":"1095 - 1110"},"PeriodicalIF":0.5,"publicationDate":"2024-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140227286","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
Simulation of heating of the sensitive element of the heat flux sensors in a high-velocity flow under variable input conditions 模拟在可变输入条件下高速气流中热流传感器敏感元件的加热过程
IF 0.5 4区 工程技术
Thermophysics and Aeromechanics Pub Date : 2024-03-20 DOI: 10.1134/S086986432306001X
I. R. Vasnev, M. A. Goldfeld, N. N. Fedorova
{"title":"Simulation of heating of the sensitive element of the heat flux sensors in a high-velocity flow under variable input conditions","authors":"I. R. Vasnev,&nbsp;M. A. Goldfeld,&nbsp;N. N. Fedorova","doi":"10.1134/S086986432306001X","DOIUrl":"10.1134/S086986432306001X","url":null,"abstract":"<div><p>The paper presents the results of numerical simulations of high-velocity turbulent air flows in a plane channel with a variable cross section exhibiting sudden expansion with allowance for coupled heat transfer with copper plates modeling the sensitive elements of heat flux sensors. The simulations are performed for conditions of a high-enthalpy short-duration wind tunnel whose specific features are the short duration of the test regime and unsteady “falling” conditions at the model channel entrance. The wave structure of the supersonic flow, which affects the heat fluxes at the walls, is analyzed for various Mach numbers at the model channel entrance. The numerical algorithm is validated on the basis of experimental data on heating of the sensitive elements of heat flux sensors for unsteady input conditions at the channel entrance. The influence of the Mach number, static parameters, and stagnation parameters on the rate of heating of the sensitive elements located at various points in the channel is studied numerically. The heat fluxes calculated under constant and “falling” conditions at the channel entrance are compared. It is shown that the accuracy of heat flux modeling can be increased by taking into account the intensity of oscillations of the flow parameters and their changes along the channel.</p></div>","PeriodicalId":800,"journal":{"name":"Thermophysics and Aeromechanics","volume":"30 6","pages":"967 - 982"},"PeriodicalIF":0.5,"publicationDate":"2024-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140172413","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 sizes and velocities of the droplets produced by water injection system with compressed-air atomizer into the intake manifold of an internal combustion engine applying the optic methods 应用光学方法对带有压缩空气雾化器的水喷射系统在内燃机进气歧管中产生的液滴的大小和速度进行实验研究
IF 0.5 4区 工程技术
Thermophysics and Aeromechanics Pub Date : 2024-03-20 DOI: 10.1134/S0869864323060136
M. D. Garipov, A. G. Khafizov, R. F. Zinnatullin, A. A. Melkov, V. A. Shayakhmetov, O. A. Gobyzov
{"title":"Experimental study of sizes and velocities of the droplets produced by water injection system with compressed-air atomizer into the intake manifold of an internal combustion engine applying the optic methods","authors":"M. D. Garipov,&nbsp;A. G. Khafizov,&nbsp;R. F. Zinnatullin,&nbsp;A. A. Melkov,&nbsp;V. A. Shayakhmetov,&nbsp;O. A. Gobyzov","doi":"10.1134/S0869864323060136","DOIUrl":"10.1134/S0869864323060136","url":null,"abstract":"<div><p>The paper studies the quality of water spraying by system with a compressed-air atomizer designed for water injection into the intake manifold of an internal combustion engine. The system consists of a two-cylinder piston compressor providing compression of water-air mixture in the working chambers. The piston compressor has connection to the atomizer through long channels. The droplet sizes were measured through automatic image processing by the Shadow Photography method. The droplet velocity field was measured by 2D-PIV method. Experimental results demonstrated that the injection system offers a high quality of atomization for the air/water mass ratio higher than 0.46. The Sauter mean diameter was no more than 31.1 µm.</p></div>","PeriodicalId":800,"journal":{"name":"Thermophysics and Aeromechanics","volume":"30 6","pages":"1111 - 1121"},"PeriodicalIF":0.5,"publicationDate":"2024-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140225972","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 Novec 7100 in vapor phase 消费及工业专用化学品 7100 在气相中的导热率
IF 0.5 4区 工程技术
Thermophysics and Aeromechanics Pub Date : 2024-02-13 DOI: 10.1134/S0869864323050116
E. P. Raschektaeva, S. V. Stankus
{"title":"Thermal conductivity of Novec 7100 in vapor phase","authors":"E. P. Raschektaeva,&nbsp;S. V. Stankus","doi":"10.1134/S0869864323050116","DOIUrl":"10.1134/S0869864323050116","url":null,"abstract":"<div><p>Thermal conductivity of a Novec 7100 fluid sample was measured by the steady-state method of coaxial cylinders. Experiments were performed in the temperature range 350–385 K and pressure range 0.12–0.21 MPa. The error for experimental data on thermal conductivity is about 1.5–2.5 %. The error in measuring temperature and pressure was less than 0.05 K and 4 kPa, correspondingly. The general equation for calculating the thermal conductivity as a function of pressure and temperature was formulated. Thermal conductivity was defined for the ideal gas state. A previously developed approach was tested in application for a single-measurement prediction of thermal conductivity.</p></div>","PeriodicalId":800,"journal":{"name":"Thermophysics and Aeromechanics","volume":"30 5","pages":"935 - 938"},"PeriodicalIF":0.5,"publicationDate":"2024-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139772369","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
Density and thermal expansion of indium–lead melts 铟铅熔体的密度和热膨胀
IF 0.5 4区 工程技术
Thermophysics and Aeromechanics Pub Date : 2024-02-13 DOI: 10.1134/S0869864323050153
R. N. Abdullaev, R. A. Khairulin, S. V. Stankus
{"title":"Density and thermal expansion of indium–lead melts","authors":"R. N. Abdullaev,&nbsp;R. A. Khairulin,&nbsp;S. V. Stankus","doi":"10.1134/S0869864323050153","DOIUrl":"10.1134/S0869864323050153","url":null,"abstract":"<div><p>The volumetric properties of liquid indium-lead alloys containing 20 and 33 at. % Pb have been measured using gamma-ray attenuation technique at temperatures from the liquidus line to 880 K. The density changes of these alloys during solid–liquid phase transition have been calculated. The obtained experimental values of the molar volume and the volumetric thermal expansion coefficient of melts and the results of calculations according to the laws for an ideal solution and data of other authors have been compared.</p></div>","PeriodicalId":800,"journal":{"name":"Thermophysics and Aeromechanics","volume":"30 5","pages":"961 - 966"},"PeriodicalIF":0.5,"publicationDate":"2024-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139772373","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 pressure of a propane-butane mixture on the morphology of carbon nanomaterial formed in an arc discharge 丙烷-丁烷混合物的压力对电弧放电形成的碳纳米材料形态的影响
IF 0.5 4区 工程技术
Thermophysics and Aeromechanics Pub Date : 2024-02-13 DOI: 10.1134/S0869864323050098
M. A. Morozova, A. V. Ukhina, A. V. Zaikovskii
{"title":"Influence of the pressure of a propane-butane mixture on the morphology of carbon nanomaterial formed in an arc discharge","authors":"M. A. Morozova,&nbsp;A. V. Ukhina,&nbsp;A. V. Zaikovskii","doi":"10.1134/S0869864323050098","DOIUrl":"10.1134/S0869864323050098","url":null,"abstract":"<div><p>The morphology of carbon material formed in an arc discharge in a mixture of i-butane, n-butane, and propane when spraying a graphite-nickel electrode was studied. The experiments were carried out with changing the gas medium pressure. Carbon globules, graphene structures, and carbon nanotubes have been discovered. It was found that at pressures of 75 and 400 torr, carbon globules predominate in the resulting materials. At gas pressures of 200 torr, the material collected from the cold screen surface contains both graphene-like structures and significant amounts of carbon nanotubes. The physical reasons influencing the observed phenomena are discussed.</p></div>","PeriodicalId":800,"journal":{"name":"Thermophysics and Aeromechanics","volume":"30 5","pages":"917 - 924"},"PeriodicalIF":0.5,"publicationDate":"2024-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139772371","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
Boundary-layer control on a body of revolution with a large aspect ratio by means of distributed air blowing 通过分布式吹气对大长径比旋转体进行边界层控制
IF 0.5 4区 工程技术
Thermophysics and Aeromechanics Pub Date : 2024-02-13 DOI: 10.1134/S0869864323050037
V. I. Kornilov
{"title":"Boundary-layer control on a body of revolution with a large aspect ratio by means of distributed air blowing","authors":"V. I. Kornilov","doi":"10.1134/S0869864323050037","DOIUrl":"10.1134/S0869864323050037","url":null,"abstract":"<div><p>Results of studying the process of air blowing through a perforated section of the surface on an axisymmetric body with an aspect ratio of 25.3 in an incompressible flow with the Reynolds number Re<sub><i>L</i></sub> = 4.36·10<sup>6</sup> are reported. The blowing coefficient <i>C</i><sub>b</sub> is varied in the interval from zero to 0.00885. It is shown that distributed blowing through a perforated wall with improved geometry ensures a significant gain in friction drag as compared to that for the base configuration. Beginning from the frontal boundary of this section and further downstream, stable reduction of local friction is observed, which reaches 72 % directly in the region of blowing with the maximum intensity. In view of the energy expenses on the blowing process, the degree of energy saving can reach 1.4 to 6.1 % for the blowing region being located on the cylindrical part of the model. The efficiency of this method of boundary layer control can be refined by a more accurate determination of the contribution of the drag component induced by the pressure and friction forces on the frontal part of the body. The importance of estimating the possibility of using the proposed approach for the case of air blowing through a surface section on the frontal part of the body is noted.</p></div>","PeriodicalId":800,"journal":{"name":"Thermophysics and Aeromechanics","volume":"30 5","pages":"819 - 833"},"PeriodicalIF":0.5,"publicationDate":"2024-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139772374","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 a regenerative cooling system while using heat-conductive metal nanoparticle suspension in n-decane 使用正癸烷中的导热金属纳米颗粒悬浮液的再生冷却系统研究
IF 0.5 4区 工程技术
Thermophysics and Aeromechanics Pub Date : 2024-02-13 DOI: 10.1134/S0869864323050104
K. Yu. Arefiev, A. M. Saveliev, A. V. Voronetskii, S. V. Kruchkov
{"title":"Study of a regenerative cooling system while using heat-conductive metal nanoparticle suspension in n-decane","authors":"K. Yu. Arefiev,&nbsp;A. M. Saveliev,&nbsp;A. V. Voronetskii,&nbsp;S. V. Kruchkov","doi":"10.1134/S0869864323050104","DOIUrl":"10.1134/S0869864323050104","url":null,"abstract":"<div><p>The paper presents the calculation estimates for efficiency of regenerative cooling for a model cylinder-shaped flow duct using a suspension of heat-conductive metal nanoparticles in n-decane as fuel/coolant. We adapted a standard mathematical model of conjugated heat transfer that accounts for thermophysical properties of the metal nanoparticle suspension and n-decane. The data are presented for heating up the nanosuspension and the model duct walls for the cases of different content of metal nanoparticles in nanosuspension. There exists a range beneficial for heat transfer from n-decane.</p></div>","PeriodicalId":800,"journal":{"name":"Thermophysics and Aeromechanics","volume":"30 5","pages":"925 - 934"},"PeriodicalIF":0.5,"publicationDate":"2024-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139772612","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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