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Radiation Characteristics of Shock-Heated Air in the Visible and Infrared Spectral Ranges 冲击加热空气在可见光谱和红外光谱范围内的辐射特性
IF 0.9 4区 工程技术
Fluid Dynamics Pub Date : 2023-10-16 DOI: 10.1134/S0015462823601328
P. V. Kozlov, I. E. Zabelinskii, N. G. Bykova, G. Ya. Gerasimov, V. Yu. Levashov
{"title":"Radiation Characteristics of Shock-Heated Air in the Visible and Infrared Spectral Ranges","authors":"P. V. Kozlov,&nbsp;I. E. Zabelinskii,&nbsp;N. G. Bykova,&nbsp;G. Ya. Gerasimov,&nbsp;V. Yu. Levashov","doi":"10.1134/S0015462823601328","DOIUrl":"10.1134/S0015462823601328","url":null,"abstract":"<p>The integral and temporal spectral characteristics of shock-heated air are measured in the shock wave velocity range from 7.35 to 10.4 km/s at the pressure ahead of the shock front <i>p</i><sub>0</sub> = 0.25 Torr. The experiments are carried out on the DDST-M shock-wave setup of the Institute of Mechanics of Moscow State University. The radiation wave range λ = 600–1100 nm is studied; it corresponds to the visible and near infrared spectral ranges, where the main contribution to the radiation is made by the atomic lines of nitrogen and oxygen. The integral-in-time radiation spectrograms obtained in the experiments are analyzed. The distinctive features of the time oscillograms are defined for the most typical atomic lines of the spectrum. The measurement data are compared with the experimental data of other authors.</p>","PeriodicalId":560,"journal":{"name":"Fluid Dynamics","volume":"58 5","pages":"960 - 967"},"PeriodicalIF":0.9,"publicationDate":"2023-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41229038","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
Self-Similar Flows with a Shock Wave Advancing toward the Center or Axis of Symmetry 冲击波向对称中心或对称轴推进的自相似流
IF 0.9 4区 工程技术
Fluid Dynamics Pub Date : 2023-10-16 DOI: 10.1134/S001546282370009X
Kh. F. Valiev, A. N. Kraiko
{"title":"Self-Similar Flows with a Shock Wave Advancing toward the Center or Axis of Symmetry","authors":"Kh. F. Valiev,&nbsp;A. N. Kraiko","doi":"10.1134/S001546282370009X","DOIUrl":"10.1134/S001546282370009X","url":null,"abstract":"<p>We study one-dimensional flows of an ideal (inviscid and non-heat-conducting) perfect gas with an adiabatic exponent γ behind a shock wave moving toward the center (ν = 3) or axis (ν = 2) of symmetry in a cold gas at rest. Flows with a reflected shock wave and flows terminating with simultaneous arrival of a shock wave and a piston, which has compressed the gas into a point or line, to the center of symmetry are admitted.</p>","PeriodicalId":560,"journal":{"name":"Fluid Dynamics","volume":"58 5","pages":"864 - 872"},"PeriodicalIF":0.9,"publicationDate":"2023-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S001546282370009X.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41229168","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Calculation of the Linear Stability of Fluid Flow in a Plane Channel with Transversely Corrugated Walls 具有横向波纹壁的平面通道中流体流动的线性稳定性计算
IF 0.9 4区 工程技术
Fluid Dynamics Pub Date : 2023-10-16 DOI: 10.1134/S0015462823601341
Yu. Ya. Trifonov
{"title":"Calculation of the Linear Stability of Fluid Flow in a Plane Channel with Transversely Corrugated Walls","authors":"Yu. Ya. Trifonov","doi":"10.1134/S0015462823601341","DOIUrl":"10.1134/S0015462823601341","url":null,"abstract":"<p>The linear stability of plane Poiseuille flow in a channel with the corrugated bottom wall is considered using the full Navier–Stokes equations. The wall is corrugated across the flow, and main flow has a single velocity component. The perturbations of the velocity and pressure fields are three-dimensional and have two wavenumbers. The generalized eigenvalue problem is solved numerically. It is found that the critical Reynolds number, above which perturbations grow with time, depends on the dimensionless amplitude and the corrugation period in a complex way. The corrugation amplitude/period ratio separates the dimensionless corrugation amplitude into two regions in which the dependences of the critical Reynolds number on the corrugation parameters are qualitatively different.</p>","PeriodicalId":560,"journal":{"name":"Fluid Dynamics","volume":"58 5","pages":"873 - 881"},"PeriodicalIF":0.9,"publicationDate":"2023-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41229169","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
Direct Statistical Monte Carlo Simulation of Argon Radiation Behind the Front of a Strong Shock Wave 强激波锋面后氩辐射的直接统计蒙特卡罗模拟
IF 0.9 4区 工程技术
Fluid Dynamics Pub Date : 2023-08-30 DOI: 10.1134/S0015462823600918
A. L. Kusov, V. Yu. Levashov, G. Ya. Gerasimov, P. V. Kozlov, N. G. Bykova, I. E. Zabelinsky
{"title":"Direct Statistical Monte Carlo Simulation of Argon Radiation Behind the Front of a Strong Shock Wave","authors":"A. L. Kusov,&nbsp;V. Yu. Levashov,&nbsp;G. Ya. Gerasimov,&nbsp;P. V. Kozlov,&nbsp;N. G. Bykova,&nbsp;I. E. Zabelinsky","doi":"10.1134/S0015462823600918","DOIUrl":"10.1134/S0015462823600918","url":null,"abstract":"<p>We describe a technique for modeling the excitation of electronic levels, bremsstrahlung, and photoionization in the Monte Carlo method of direct statistical simulation. The simulation results are compared with known experimental and numerical data.</p>","PeriodicalId":560,"journal":{"name":"Fluid Dynamics","volume":"58 4","pages":"759 - 772"},"PeriodicalIF":0.9,"publicationDate":"2023-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"5139923","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
Nonisothermal Fluid Flow in a Well during Induction Heating of the Casing String 套管感应加热过程中的非等温流体流动
IF 0.9 4区 工程技术
Fluid Dynamics Pub Date : 2023-08-30 DOI: 10.1134/S0015462823600505
F. F. Davletshin, R. Z. Akchurin, R. F. Sharafutdinov, D. F. Islamov
{"title":"Nonisothermal Fluid Flow in a Well during Induction Heating of the Casing String","authors":"F. F. Davletshin,&nbsp;R. Z. Akchurin,&nbsp;R. F. Sharafutdinov,&nbsp;D. F. Islamov","doi":"10.1134/S0015462823600505","DOIUrl":"10.1134/S0015462823600505","url":null,"abstract":"<p>The distinctive features of the flow velocity and temperature fields of ascending fluid flow in a metal round pipe (round casing string installed in a production well) under the conditions of its local induction heating are studied. The results of investigation are based on numerical solution of the Navier–Stokes equations in the Boussinesq–Oberbeck approximation. The calculations were performed using the Ansys Fluent software package (license ANSYS Academic Research CFD under the agreement with the Bashkir State University dated June 15, 2020). The fluid flow rates of 10 and 50 m<sup>3</sup> per day are considered. Such flow rates correspond to the laminar and transitional flow regimes in the casing pipe. It is found that local perturbations of the velocity and temperature fields are presented in the near-wall region of the heated casing. Fluid temperature perturbations reach several Kelvin degrees, the local flow velocity which increases due to natural thermal convection in the near-wall region of the casing string being several times higher than the cross-section-average flow velocity. The occurrence of areas of vortex flow motion over the interval of induction heating due to natural thermal convection is shown.</p>","PeriodicalId":560,"journal":{"name":"Fluid Dynamics","volume":"58 4","pages":"586 - 597"},"PeriodicalIF":0.9,"publicationDate":"2023-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"5142701","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 Modeling of Supersonic Flow with a Region of Heat Release by a Longitudinal-Transverse Discharge 超声速纵向-横向流动放热区域的数值模拟
IF 0.9 4区 工程技术
Fluid Dynamics Pub Date : 2023-08-30 DOI: 10.1134/S0015462823600281
K. N. Kornev, A. A. Logunov, V. M. Shibkov
{"title":"Numerical Modeling of Supersonic Flow with a Region of Heat Release by a Longitudinal-Transverse Discharge","authors":"K. N. Kornev,&nbsp;A. A. Logunov,&nbsp;V. M. Shibkov","doi":"10.1134/S0015462823600281","DOIUrl":"10.1134/S0015462823600281","url":null,"abstract":"<p>Steady supersonic air flow in a diverging aerodynamic channel of rectangular cross-section is numerically simulated. The channel represents a laboratory model of an air-breathing straight-flow engine. The aerodynamic model is validated using the experimental data for the case in which the zone of volumetric heat release is absent. After the model has been validated a supersonic flow with a built-in zone of volumetric heat release was numerically simulated. Three-dimensional distributions of the velocity, temperature, and pressure in a steady supersonic air flow are obtained. It is shown that in the case, in which the volumetric density of the heat power of the source is equivalent to the mean total power of the discharge <i>W</i> = 10 kW, the discharge heats the gas up to the temperature <i>T</i> = 1700 to 4200 K, which leads to flow acceleration without its thermal choking. When the thermal power density of the source is equivalent to the mean common discharge power <i>W</i> = 20 kW, the gas is heated more strongly, up to 6700 K, but then local thermal choking of the flow occurs.</p>","PeriodicalId":560,"journal":{"name":"Fluid Dynamics","volume":"58 4","pages":"640 - 648"},"PeriodicalIF":0.9,"publicationDate":"2023-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"5142709","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
Analysis of Self-Oscillation Processes in a Cavity with a Flow of OpenType on the Basis of the Data of Vortex-Resolving Calculations 基于涡解析计算数据的OpenType流腔内自振荡过程分析
IF 0.9 4区 工程技术
Fluid Dynamics Pub Date : 2023-08-30 DOI: 10.1134/S0015462823600517
B. N. Dan’kov, A. P. Duben’, T. K. Kozubskaya
{"title":"Analysis of Self-Oscillation Processes in a Cavity with a Flow of OpenType on the Basis of the Data of Vortex-Resolving Calculations","authors":"B. N. Dan’kov,&nbsp;A. P. Duben’,&nbsp;T. K. Kozubskaya","doi":"10.1134/S0015462823600517","DOIUrl":"10.1134/S0015462823600517","url":null,"abstract":"<p>The mechanisms of self-oscillation processes occurring in cavities of open flow type are considered and substantiated on the basis of a detailed investigation of the phenomena of hydrodynamic, flow-rate, wave, and resonance nature. The theoretical conclusions are substantiated by an analysis of the data of numerical experiments performed by different authors.</p>","PeriodicalId":560,"journal":{"name":"Fluid Dynamics","volume":"58 4","pages":"659 - 669"},"PeriodicalIF":0.9,"publicationDate":"2023-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"5146468","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 the Overequilibrium Surface Heating Effect in a Subsonic Dissociated Air Jet 亚声速分离空气射流过平衡表面加热效应的实验研究
IF 0.9 4区 工程技术
Fluid Dynamics Pub Date : 2023-08-30 DOI: 10.1134/S0015462823601006
A. V. Chaplygin
{"title":"Experimental Study of the Overequilibrium Surface Heating Effect in a Subsonic Dissociated Air Jet","authors":"A. V. Chaplygin","doi":"10.1134/S0015462823601006","DOIUrl":"10.1134/S0015462823601006","url":null,"abstract":"<p>The effect of overequilibrium heating of a surface with nonuniform catalytic properties in a subsonic flow of dissociated air is experimentally studied using the VGU-4 HF-plasmatron. A temperature jump is observed on a plate of Buran orbital vehicle heat-shield material as the flow transitions from the low-catalytic area of the surface to the high-catalytic area covered with chromium-nickel spinel NiCr<sub>2</sub>O<sub>4</sub>. A temperature jump is also observed on the heat-shield tile of the Buran orbital vehicle at the transition from the low-catalytic area of its surface to the medium-catalytic area covered with niobium. The temperatures of the surfaces with uniform and nonuniform catalytic properties under the same flow regimes are compared.</p>","PeriodicalId":560,"journal":{"name":"Fluid Dynamics","volume":"58 4","pages":"712 - 722"},"PeriodicalIF":0.9,"publicationDate":"2023-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"5139928","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 Investigation of the Structure of Fracture Network Impact on the Fluid Flow through a Poroelastic Medium 裂缝网络结构对孔隙弹性介质中流体流动影响的数值研究
IF 0.9 4区 工程技术
Fluid Dynamics Pub Date : 2023-08-30 DOI: 10.1134/S001546282360027X
D. Yu. Legostaev, S. P. Rodionov
{"title":"Numerical Investigation of the Structure of Fracture Network Impact on the Fluid Flow through a Poroelastic Medium","authors":"D. Yu. Legostaev,&nbsp;S. P. Rodionov","doi":"10.1134/S001546282360027X","DOIUrl":"10.1134/S001546282360027X","url":null,"abstract":"<p>Two-dimensional single-phase flow of a weakly compressible fluid through a deformable fractured-porous medium is considered. A poroelastic model is used for coupled simulation of the fluid flow and the related changes in the stress state of the medium. Fracture network is simulated using the discrete fracture model. The fractures in the region under consideration have random location and orientations, and the fracture length distribution follows a power law. The dependence of the hydraulic properties of fractured porous media on its stress-strain state and the structure of the fracture network is studied. Numerical study was performed for various realizations of fracture network obtained using multiple random generation. It is found that the permeability of the fractured porous medium is determined mainly by the structure of the fracture system characterized by the percolation parameter. According to the simulations results, hydraulic properties are significantly affected by the stress-strain state only for connected fracture systems. An approximation is proposed to define the dependence of the equivalent permeability of a fractured-porous medium on the following parameters: the connectivity of the fracture system, the stress-strain state of the medium, and fracture properties such as stiffness and aperture.</p>","PeriodicalId":560,"journal":{"name":"Fluid Dynamics","volume":"58 4","pages":"598 - 611"},"PeriodicalIF":0.9,"publicationDate":"2023-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"5141420","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 Gas-Dynamic and Thermal Processes in a Pulsed Electric Discharge 脉冲放电中气体动力学和热过程的数值研究
IF 0.9 4区 工程技术
Fluid Dynamics Pub Date : 2023-08-30 DOI: 10.1134/S0015462823601055
E. A. Ermakov, I. E. Ivanov
{"title":"Numerical Study of Gas-Dynamic and Thermal Processes in a Pulsed Electric Discharge","authors":"E. A. Ermakov,&nbsp;I. E. Ivanov","doi":"10.1134/S0015462823601055","DOIUrl":"10.1134/S0015462823601055","url":null,"abstract":"<p>The processes accompanying the formation of a contracted (columnar) high-current nanosecond electric discharge in subcentimeter gaps filled with nitrogen are numerically investigated in this work. The space between two flat electrodes is considered in the case when a potential difference of 25 kV is instantly established between them. The voltage is applied for a time interval of 200 ns and then instantly removed. The characteristics of the nonthermal and thermal stages of electric-discharge development are studied, namely: the formation and growth of a streamer, the closure of a discharge gap by a streamer, the formation of a plasma channel, secondary ionization waves, and an increase in current density and temperature in the axial region of the channel. After switching off the electric field, the gas-dynamic processes associated with the discharge thermal effect on a neutral gas are investigated. Gas-dynamic processes are determined by the propagation of shock waves and rarefaction waves in the radial direction with respect to the axis of symmetry. The quantitative values of both the electric field (electron density and intensity) and gas-dynamic parameters (temperature, pressure, and gas velocity) are determined.</p>","PeriodicalId":560,"journal":{"name":"Fluid Dynamics","volume":"58 4","pages":"745 - 758"},"PeriodicalIF":0.9,"publicationDate":"2023-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"5146462","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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