Fluid Dynamics最新文献_第8页

Diffusion-Drift Model of the Surface Glow Discharge in Supersonic Gas Flow 超音速气体流中表面辉光放电的扩散漂移模型

IF 1 4区工程技术

Fluid Dynamics Pub Date : 2024-04-04 DOI: 10.1134/S0015462823602346

S. T. Surzhikov

{"title":"Diffusion-Drift Model of the Surface Glow Discharge in Supersonic Gas Flow","authors":"S. T. Surzhikov","doi":"10.1134/S0015462823602346","DOIUrl":"10.1134/S0015462823602346","url":null,"abstract":"The two-dimensional electrogasdynamic problem of anomalous glow discharge on the surface of a sharp plate in supersonic flow of a perfect gas is solved using the system of Navier–Stokes equations to describe thermogasdynamic processes in the boundary layer and the two-temperature two-fluid diffusion-drift model of gas-discharge plasma to determine the electrodynamic structure of the discharge. The near-electrode regions of space charge and the external electrical circuit consisting of a power source and an ohmic resistance are taken into account. The influence of the magnetic field which is transverse to gas flow and has the induction of up to 0.03 T on the structure of boundary layer and glow discharge is studied. The electrogasdynamic structure of anomalous near-surface discharges is studied numerically over a wide range of gas flow velocities (M = 5–20), the free-stream pressures (p = 0.6–5 Torr), the electrode voltages, and the electric currents through the discharges. The electrodynamic structure of the gas-plasma flow near the electrodes and the effect of the glow discharge on the pressure and temperature distributions along the surface of the plate are also studied.","PeriodicalId":560,"journal":{"name":"Fluid Dynamics","volume":"59 1","pages":"145 - 168"},"PeriodicalIF":1.0,"publicationDate":"2024-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140565156","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

Conical Bodies with Star-Shaped Transverse Contour Having the Minimum Wave Drag 具有最小波阻力的星形横向轮廓圆锥体

IF 1 4区工程技术

Fluid Dynamics Pub Date : 2024-04-04 DOI: 10.1134/S0015462823602966

S. A. Takovitskii

{"title":"Conical Bodies with Star-Shaped Transverse Contour Having the Minimum Wave Drag","authors":"S. A. Takovitskii","doi":"10.1134/S0015462823602966","DOIUrl":"10.1134/S0015462823602966","url":null,"abstract":"The problem of constructing the transverse contour of a conical body having the minimum wave drag in the range of supersonic velocities provided that the length and the volume are preserved is considered. A cone is taken as the initial body, an assumption about locality of the relation between variations in the geometric parameters and the pressure on the surface is made, and the quadratic approximation of this relation is used. The found solution is compared with the results obtained within the framework of the Newton model. These solutions are proposed to combine being based on the assumption of the power-law relation between the radius and the derivative of radius with respect to the angular coordinate. In this case, a class of contours in which half of the cycle consists of the element with monotonic variation in the radius and arc of the circle is distinguished. These contours can be described by specifying a single geometric parameter, namely, the exponent. Using the inviscid perfect gas model, direct numerical optimization of the shape of transverse contour is carried out and the possibility of reducing the wave drag as compared to the star-shaped bodies with plane faces is demonstrated.","PeriodicalId":560,"journal":{"name":"Fluid Dynamics","volume":"59 1","pages":"122 - 129"},"PeriodicalIF":1.0,"publicationDate":"2024-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140565405","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

Diagnostics of the Ionization Processes in Hydrocarbon Flame with the Use of the Current–Voltage Characteristics 利用电流-电压特性诊断碳氢化合物火焰中的电离过程

IF 1 4区工程技术

Fluid Dynamics Pub Date : 2024-04-04 DOI: 10.1134/S0015462823602322

V. A. Polyanskii, I. L. Pankrat’eva

引用次数: 0

Modeling of the Unsteady Aerodynamic Characteristics of the NACA 0015 Airfoil from the Data of Numerical Calculations of the Flow 根据流动数值计算数据建立 NACA 0015 机翼非稳态空气动力特性模型

IF 1 4区工程技术

Fluid Dynamics Pub Date : 2024-04-04 DOI: 10.1134/S0015462823602929

K. A. Abramova, D. A. Alieva, V. G. Sudakov, A. N. Khrabrov

引用次数: 0

The Diffusion Stability of an Externally Driven Cavitation Bubble in Micro-Confinement 微凝固中外部驱动空化泡的扩散稳定性

IF 1 4区工程技术

Fluid Dynamics Pub Date : 2024-04-04 DOI: 10.1134/S0015462823602413

K. V. Leonov, I. Sh. Akhatov

{"title":"The Diffusion Stability of an Externally Driven Cavitation Bubble in Micro-Confinement","authors":"K. V. Leonov, I. Sh. Akhatov","doi":"10.1134/S0015462823602413","DOIUrl":"10.1134/S0015462823602413","url":null,"abstract":"The diffusion stability of a single cavitation bubble in a spherical liquid cell surrounded by an infinite elastic solid is considered. The time-periodic pressure in the solid far away from the liquid cell is used as an external driving, which initiates bubble oscillations along with the gas diffusion process in the bubble-in-cell system. The work is based on the engineering approximation according to which the bubble growth/reduction is considered on average, assuming that during the period of the external driving the mass of gas in the bubble does not noticeably change. This theory predicts the existence of stably oscillating bubbles in confined liquid undergoing an external driving force. Three possible diffusion regimes are revealed: 1) total bubble dissolution, 2) partial bubble dissolution, and 3) partial bubble growth, where the last two regimes provide the diffusion stability in the bubble-in-cell system. The parametric study of the influence of the gas concentration dissolved in the liquid on the resulting stable bubble size is conducted. The obtained results are compared with the results for the case of the stable bubble oscillations in the pressure sound field in a bulk (infinite) liquid. The theoretical findings of the present study can be used for improvement of the modern applications of ultrasound technology.","PeriodicalId":560,"journal":{"name":"Fluid Dynamics","volume":"59 1","pages":"60 - 73"},"PeriodicalIF":1.0,"publicationDate":"2024-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140565162","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

Oscillations of a Fluid in a Circular Cylinder with Bottom Elevation 底部隆起的圆柱中的流体振荡

IF 1 4区工程技术

Fluid Dynamics Pub Date : 2024-04-04 DOI: 10.1134/S0015462823602486

S. V. Nesterov, V. A. Kalinichenko