Fluid Dynamics最新文献_第9页

Effect of Surface Tension on Splashes of a Liquid during Drop Falling on a Rigid Obstacle 液滴落在刚性障碍物上时表面张力对飞溅的影响

IF 1 4区工程技术

Fluid Dynamics Pub Date : 2025-04-28 DOI: 10.1134/S001546282460490X

A. V. Bazilevskii, A. N. Rozhkov

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Specific Features of Supersonic Flow past Bodies with Instantaneous Energy Input in a Gas Bubble Ahead of the Bow Shock 弓形激波前气泡中瞬时能量输入超声速流过物体的特性

IF 1 4区工程技术

Fluid Dynamics Pub Date : 2025-04-28 DOI: 10.1134/S0015462824605588

P. Yu. Georgievskii, V. A. Levin, O. G. Sutyrin

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Analysis of Wave Motions of a Viscous Incompressible Fluid on a Rotating Wall in the Presence of a Cross Flow 存在横流时粘性不可压缩流体在旋转壁面上的波动分析

IF 1 4区工程技术

Fluid Dynamics Pub Date : 2025-04-28 DOI: 10.1134/S0015462824604698

A. A. Gurchenkov

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Progress on Ablation of Nozzle Throat Inserts in Solid Rocket Motors 固体火箭发动机喷管喉部衬垫烧蚀研究进展

IF 1 4区工程技术

Fluid Dynamics Pub Date : 2025-04-28 DOI: 10.1134/S0015462824605254

Z. T. Zhou, T. Y. Cao, Y. Q. Li, L. Ji

{"title":"Progress on Ablation of Nozzle Throat Inserts in Solid Rocket Motors","authors":"Z. T. Zhou, T. Y. Cao, Y. Q. Li, L. Ji","doi":"10.1134/S0015462824605254","DOIUrl":"10.1134/S0015462824605254","url":null,"abstract":"During engine operation, the nozzle throat insert components are subjected to high temperatures, pressures, velocities, and erosive gas flow, leading to changes in the nozzle throat diameter, which in turn affect the engine thrust performance. This paper elaborates on the erosion behavior and the mechanism of solid rocket motor throat inserts from three aspects: theoretical study, experimental study, and numerical simulation. In the field of theoretical research, the main focus is on studying empirical formulas, theoretical ablation models, and improved methods for predicting ablation. These studies involve summarizing the characteristics of ablation and proposing simplified ablation models; in terms of the experimental study, the common ablation experimental methods are summarized and the principles, advantages and disadvantages of several types of typical ablation experimental methods are analyzed. In the numerical simulation, more comprehensive ablation models and improved ablation methods are proposed based on the theoretical and experimental contents. Finally, some suggestions are made for the following ablation researches to provide reference and references for future throat insert ablation researches.","PeriodicalId":560,"journal":{"name":"Fluid Dynamics","volume":"60 2","pages":""},"PeriodicalIF":1.0,"publicationDate":"2025-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143883627","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}

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Structure of Subsonic Separation Flow past Cylindrical Cavities of Various Shapes in Plan on the Wall of a Plane Channel 平面通道壁面上不同形状圆柱空腔的亚声速分离流结构

IF 1 4区工程技术

Fluid Dynamics Pub Date : 2025-04-28 DOI: 10.1134/S0015462824605370

M. A. Zubin, A. F. Zubkov, A. Yu. Chulyunin

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Mathematical Model of Rotational Oscillations of a Porous Spherical Shell with a Gas Cavity in Viscous Fluid 粘性流体中含气腔多孔球壳旋转振荡的数学模型

IF 1 4区工程技术

Fluid Dynamics Pub Date : 2025-04-28 DOI: 10.1134/S0015462824605102

O. A. Bazarkina, N. G. Taktarov

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Singularity Problem for One-Dimensional Steady-State Gas Dynamics Problems 一维稳态气体动力学问题的奇异性问题

IF 1 4区工程技术

Fluid Dynamics Pub Date : 2025-04-28 DOI: 10.1134/S001546282460562X

D. E. Khazov

引用次数: 0

The Black Sea Hydrophysical Fields Computation Based on Integration of the Vertical Turbulent Exchange Coefficients Determined from the In-Situ Measurements and the MHI Numerical Model 基于实测垂直湍流交换系数与MHI数值模型积分的黑海水物理场计算

IF 1 4区工程技术

Fluid Dynamics Pub Date : 2025-04-28 DOI: 10.1134/S0015462824604224

A. M. Chukharev, D. A. Kazakov, N. V. Markova, O. A. Dymova

{"title":"The Black Sea Hydrophysical Fields Computation Based on Integration of the Vertical Turbulent Exchange Coefficients Determined from the In-Situ Measurements and the MHI Numerical Model","authors":"A. M. Chukharev, D. A. Kazakov, N. V. Markova, O. A. Dymova","doi":"10.1134/S0015462824604224","DOIUrl":"10.1134/S0015462824604224","url":null,"abstract":"The analysis of the results of numerical experiments on the calculation of hydrophysical fields in the north-eastern part of the Black Sea was carried out based on the Marine Hydrophysical Institute (MHI) three-dimensional ocean dynamics model. The fundamental novelty of the simulations presented is the use of vertical turbulent exchange coefficients, derived from the experimental data based on the velocity and temperature fluctuations microstructural profiles obtained from “Sigma-1.5” sounding complex field observations. The measurements were carried out in the upper stratified sea layers during expeditionary research on the R/V Professor Vodyanitsky. A comparison of some simulations with the MHI model and the hydrological data obtained using SeaBird SBE-911plus CTD complex synchronously with the microstructural measurements shows greater reliability in the temperature and salinity fields simulated using the experimentally determined coefficients compared to simulations carried out with the use of Pacanowski–Philander turbulence parameterization. The presented results show the prospects of the proposed approach with the use of experimentally determined turbulent exchange coefficients for the stratified sea layers in the model.","PeriodicalId":560,"journal":{"name":"Fluid Dynamics","volume":"60 2","pages":""},"PeriodicalIF":1.0,"publicationDate":"2025-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143883628","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

Construction of the Three-Dimensional Minimum-Wave-Drag Forebody of Given Length and with a Circular Base (Review) 三维定长圆底最小波阻前体的构造（综述）

IF 1 4区工程技术

Fluid Dynamics Pub Date : 2025-04-06 DOI: 10.1134/S0015462824604716

A. N. Kraiko, N. I. Tillyaeva, I. A. Brailko

{"title":"Construction of the Three-Dimensional Minimum-Wave-Drag Forebody of Given Length and with a Circular Base (Review)","authors":"A. N. Kraiko, N. I. Tillyaeva, I. A. Brailko","doi":"10.1134/S0015462824604716","DOIUrl":"10.1134/S0015462824604716","url":null,"abstract":"We consider the problems occurring in constructing the nose parts (NP) of bodies of revolution realizing the wave drag minimum at a given body length and when the number of the planes of symmetry n ≥ 2. The axisymmetric solution of this problem had been given by I. Newton in his Philosophiae Naturalis Principia Mathematica within the framework of his own Newton formula (NF) for the pressure on the windward side of a body in flow suggested in the same study. The solution given by Newton without any explanations was not at once understood by aerodynamicists who turned to the solution of this problem and its certain generalizations at the mid-twentieth century. Newton’s Principia were translated into Russian by A.N. Krylov, who gave also detailed commentaries to this treatise, including the problem under discussion. However, even these comments could not help to understand Newton’s solution and it was only the Soviet aerodynamicists who could cope with them. Nevertheless, before long the three-dimensional NPs could be constructed within the framework of the NF; the drag of those bodies, which had firstly star-shaped and then circular bases, was smaller than that of the axisymmetric Newtonian NPs of the same length at n ≥ 2. The mathematicians, who started to deal with this problem at the end of the 20th century and the beginning of the 21st century, and had known nothing about the studies of aerodynamicists, turned to the same NF, prohibiting concave regions of the surfaces of the required NFs. The main result of their investigations within the framework of the NF is the NP that consists of n ≥ 2 identical inclined planes, adjoining lineate surfaces, and a leading flat face—a regular n-gon (a rectilinear segment at n = 2). However, for both the theory and applications it is important to know how they behave in at least an inviscid flow. The results of calculations of these flows according to Euler equations presented below are intended to reply to this question.","PeriodicalId":560,"journal":{"name":"Fluid Dynamics","volume":"60 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2025-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143784206","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

Enhancement of Separation Flow and Heat Transfer in a Boomerang-Type Groove on the Channel Wall 通道壁上回旋型槽内分离流动和换热的增强

IF 1 4区工程技术

Fluid Dynamics Pub Date : 2025-04-06 DOI: 10.1134/S0015462824604662

S. A. Isaev, I. A. Popov, D. V. Nikushchenko, A. G. Sudakov, A. A. Klyus, A. A. Mironov

{"title":"Enhancement of Separation Flow and Heat Transfer in a Boomerang-Type Groove on the Channel Wall","authors":"S. A. Isaev, I. A. Popov, D. V. Nikushchenko, A. G. Sudakov, A. A. Klyus, A. A. Mironov","doi":"10.1134/S0015462824604662","DOIUrl":"10.1134/S0015462824604662","url":null,"abstract":"The self-organization of a tornado-like vortex enhanced by the formation of an extraordinary transverse pressure drop and the onset of a negative pressure pole in the tornado core is observed in the case of a 45° deviation of the inlet section of streamwise oriented groove on the heated wall of plane-parallel channel with increase in the relative length of the section ξ, starting from 0.15. Tornado generation leads to the development of abnormal separation flow and heat transfer enhancement in the inlet inclined part of the groove. It is known that in the inclined rectilinear grooves the abnormal enhancement of separation flow and heat transfer is characterized by weakening of vortex structures and suppression of heat transfer in the end part of the groove. It is found that at the optimum relative length ξ the orientation of the end section of the groove along the flow in the channel leads to the penetration of intense swirling flow into the end zone of the boomerang-type groove and enhances heat transfer here. The optimal length of the inlet section ξ = 0.35 is determined. At this length, a 29% increase in the maximum heat transfer from the inner groove surface compared to the plane channel wall is achieved. In this case, the heat removal inside the boomerang-type groove is 1.2 times higher than that for the straight groove at the 45° inclination angle. The critical length of the inlet section (ξ = 0.7) starting from which the swirling flow leaves the groove without reaching its end is found. The critical length is characterized by the minimum relative hydraulic losses for the section bounded by the contour of the groove spot.","PeriodicalId":560,"journal":{"name":"Fluid Dynamics","volume":"60 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2025-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143784159","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