Fluid Dynamics最新文献

Analysis of the Radial Leakage Flow Field Characteristics of an Asymmetric Micro Scroll Compressor 非对称微涡旋压缩机径向泄漏流场特性分析

IF 0.7 4区工程技术

Fluid Dynamics Pub Date : 2026-08-11 DOI: 10.1134/S0015462826605413

X. H. Chen, K. Han, H. Li, T. Gao, W. Liu

{"title":"Analysis of the Radial Leakage Flow Field Characteristics of an Asymmetric Micro Scroll Compressor","authors":"X. H. Chen, K. Han, H. Li, T. Gao, W. Liu","doi":"10.1134/S0015462826605413","DOIUrl":"10.1134/S0015462826605413","url":null,"abstract":"In response to the problem of gas leakage in scroll compressors, an asymmetric micro scroll compressor was taken as the research object to construct a radial leakage model of the scroll compressor. The working performance of the scroll compressor under various axial clearances was studied, and the influence of speed and compression ratio on the internal flow field pressure, temperature, speed, and flow rate of the scroll compressor was analyzed. When the axial clearance increases, the pressure, the temperature, the flow rate, and the power of the scroll compressor gradually decrease. In the fluid domain of a scroll compressor, the pressure distribution is uniform, while the temperature and velocity distributions are uneven. As the rotational speed increases, the leakage of the scroll compressor decreases, and the coefficient of variation in the monitoring point temperature decreases from 1.6041 to 1.4301%. The coefficient of variation in the monitoring point velocity decreases from 12.7730 to 8.9128%, and the degree of the uneven temperature and velocity distributions gradually decreases; when the compression ratio increases, the leakage of the scroll compressor increases, and the temperature variation coefficient at the monitoring point increases from 1.5700 to 2.7892%, while the velocity variation coefficient at the monitoring point increases from 11.3075 to 19.9592%. The degree of the uneven temperature and velocity distributions gradually increases. Appropriately increasing the rotational speed and reducing the compression ratio can reduce the leakage of the scroll compressor and minimize the uneven gas temperature and velocity distributions in the compression chamber of the scroll compressor.","PeriodicalId":560,"journal":{"name":"Fluid Dynamics","volume":"61 4","pages":""},"PeriodicalIF":0.7,"publicationDate":"2026-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148699699","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 Investigation of the Diaphragm Opening in the Gasdynamic CST‑14 System 气动力CST - 14系统隔膜开度的实验研究

IF 0.7 4区工程技术

Fluid Dynamics Pub Date : 2026-08-11 DOI: 10.1134/S0015462826605401

S. N. Vasilieva, I. V. Guk, V. D. Nasonov

引用次数: 0

Experimental and Numerical Investigation to Study the Significance of Various Afterbody Shapes for Flow over Bluff Bodies 不同后体形状对钝体流动影响的实验与数值研究

IF 0.7 4区工程技术

Fluid Dynamics Pub Date : 2026-08-11 DOI: 10.1134/S0015462826604237

P. Majumder, H. Dutta, M. R. Choudhury, S. Maity

引用次数: 0

Influence of the Nucleation Process on the Flow Structure during Unsteady Evaporation 非定常蒸发过程中成核过程对流动结构的影响

IF 0.7 4区工程技术

Fluid Dynamics Pub Date : 2026-08-11 DOI: 10.1134/S001546282660536X

V. Yu. Levashov

引用次数: 0

Obtaining and Regularization of a Hexagonal Irregular Computational Grid 六边形不规则计算网格的获取与正则化

IF 0.7 4区工程技术

Fluid Dynamics Pub Date : 2026-08-11 DOI: 10.1134/S0015462826605346

V. V. Kuzenov

引用次数: 0

Hydrodynamic Loads on an Oscillating Circular Cylinder in a Shear-Layer Fluid under Ice Cover 冰盖下剪切层流体中振荡圆柱的水动力载荷

IF 0.7 4区工程技术

Fluid Dynamics Pub Date : 2026-07-19 DOI: 10.1134/S0015462826605267

I. V. Sturova, L. A. Tkacheva

引用次数: 0

Propagation of Two-Dimensional Periodic Surface Disturbances in a Viscous, Continuously Stratified Fluid 粘性连续分层流体中二维周期表面扰动的传播

IF 0.7 4区工程技术

Fluid Dynamics Pub Date : 2026-07-19 DOI: 10.1134/S0015462826605334

A. A. Ochirov, Yu. D. Chashechkin

引用次数: 0

Experimental Study on Mach Disk Characteristics of an Extremely Under-Expanded Hydrogen Jet with High Pressure Direct Injection 极欠膨胀高压直喷氢射流马赫盘特性实验研究

IF 0.7 4区工程技术

Fluid Dynamics Pub Date : 2026-07-19 DOI: 10.1134/S0015462826604705

W. J. Ma, F. Ma, L. Y. Guo, C. T. Wang, Z. Z. Qin, X. Ma, F. L. Yang

{"title":"Experimental Study on Mach Disk Characteristics of an Extremely Under-Expanded Hydrogen Jet with High Pressure Direct Injection","authors":"W. J. Ma, F. Ma, L. Y. Guo, C. T. Wang, Z. Z. Qin, X. Ma, F. L. Yang","doi":"10.1134/S0015462826604705","DOIUrl":"10.1134/S0015462826604705","url":null,"abstract":"The high-pressure direct injection hydrogen internal combustion engines represent a significant technical path towards achieving zero-carbon power systems. However, current research lacks systematic experimental data and empirical models for the near-field Mach disk structure of high-pressure hydrogen jets. This study experimentally investigates the near-field Mach disk structure of the high-pressure hydrogen jets based on high-speed schlieren/shadow imaging technology. Firstly, the transient evolution laws of the Mach disk height and diameter are revealed. It is found that the Mach disk first appears approximately at 0.075 ms after injection and enters a quasi-steady state at around 0.25 ms. Secondly, based on the quasi-steady state data, empirical relationships between the dimensionless Mach disk height and diameter and the pressure ratio are established. Using the least squares fitting, empirical coefficients for the dimensionless Mach disk height and diameter are obtained as 0.4384 and 0.1442, respectively, with determination coefficients of 0.9977 and 0.989. By comparing with the empirical coefficients of classical air jets, the reasons for the lower empirical coefficients are attributed to the high-pressure real gas effect, the squeezing suppression by the high ambient pressure, and the flow loss at the outlet caused by the guide slot. The research results can provide a direct theoretical basis for CFD simulation of high-pressure direct injection hydrogen internal combustion engines.","PeriodicalId":560,"journal":{"name":"Fluid Dynamics","volume":"61 3","pages":""},"PeriodicalIF":0.7,"publicationDate":"2026-07-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148613345","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 the Design and Fluid-Structure Interaction of Ni–Ti Alloy Vascular Stent with Biomimetic Microstructure 仿生微结构镍钛合金血管支架设计及流固耦合分析

IF 0.7 4区工程技术

Fluid Dynamics Pub Date : 2026-07-19 DOI: 10.1134/S0015462826604687

L. Yang, L. Yao, J. Q. Su, L. N. Sheng

{"title":"Analysis of the Design and Fluid-Structure Interaction of Ni–Ti Alloy Vascular Stent with Biomimetic Microstructure","authors":"L. Yang, L. Yao, J. Q. Su, L. N. Sheng","doi":"10.1134/S0015462826604687","DOIUrl":"10.1134/S0015462826604687","url":null,"abstract":"In this paper, the stent material is upgraded to Ni–Ti alloy based on the common metal stent, and the bionic microstructure was designed on the inner surface of Ni–Ti alloy stent. The surface microstructure could improve the blood flow characteristics in blood vessels, reduce the probability of intrastent restenosis, and increase the service life of vascular stents. Five kinds of shark-skin triangular vascular stents of different heights are discussed by using bionic drag reduction theory and fluid dynamics theory. It is found that surface microstructure at the height of 35 μm improved the blood flow characteristics best through a comparative analysis. Then, the fluid-structure interaction of the vascular stent with the surface microstructure of 35 μm and the vascular stent without surface microstructure are established to analyze the influence of surface microstructure on the blood flow rate and the pressure in the stent, as well as the changes caused by blood reaction on the blood vessel and stent. The results showed that surface microstructure can indeed improve the blood flow characteristics in the blood vessels, reduce the probability of in-stent Restenosis and increase the service life of the stent.","PeriodicalId":560,"journal":{"name":"Fluid Dynamics","volume":"61 3","pages":""},"PeriodicalIF":0.7,"publicationDate":"2026-07-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148613415","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

Mitigating Stall in Wind Turbines through Modified Leading-Edge Tubercle Airfoils 通过改进前缘结核翼型减轻风力涡轮机失速

IF 0.7 4区工程技术

Fluid Dynamics Pub Date : 2026-07-19 DOI: 10.1134/S0015462825604462

I. Ali, T. Hussain, I. N. Unar, E. Gorgun

{"title":"Mitigating Stall in Wind Turbines through Modified Leading-Edge Tubercle Airfoils","authors":"I. Ali, T. Hussain, I. N. Unar, E. Gorgun","doi":"10.1134/S0015462825604462","DOIUrl":"10.1134/S0015462825604462","url":null,"abstract":"Tubercles at the leading edge (LE) of airfoils are used in maintaining the lift coefficient at the higher angle of attack (AoA) and delay stall. Previous research has documented the impact of varying the wavelength and amplitude of sinusoidal tubercles on the aerodynamic efficiency of various airfoil models, with a particular focus on changes at the leading edge. This study introduces a novel approach to tubercle design by analyzing the aerodynamic efficiency of a sinusoidal leading edge airfoil featuring a single, high-amplitude tubercle, offering a more realistic estimate of its effects. The research involves the development of three wing models – first, a baseline with a smooth leading edge; second, an airfoil with a tubercle labeled A3λ11; and third, an airfoil featuring a high-amplitude tubercle (A311λ11) on a sinusoidal leading edge. All airfoil models are developed using the NACA0021 airfoil profile and simulated at the 20° angle of attack. Large eddy simulations (LES) are conducted at a chord-based Reynolds number Rec = 1.2 × 105, and the results are validated against experimental data reported in the literature. Compared with the baseline airfoil, both tubercle airfoils show a substantial increase in the lift coefficient and a reduction in the drag coefficient. For the A3λ11 and A311λ11 airfoil models the lift coefficients increase by 34.8 and 12%, respectively. Moreover, reduction in the drag coefficient of about 10.3 and 23.6% are noticed for the A3λ11 and A311λ11 airfoil models, respectively. Additionally, the results reveal that the A311λ11 airfoil model exhibits a 14.9% reduction in the drag coefficient as compared to that of the sinusoidal A3λ11 airfoil model.","PeriodicalId":560,"journal":{"name":"Fluid Dynamics","volume":"61 3","pages":""},"PeriodicalIF":0.7,"publicationDate":"2026-07-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148613315","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