带不对称槽的圆柱体的流动特性：建模与实验研究

IF 1.1 4区工程技术 Q4 MECHANICS

Journal of Applied Fluid Mechanics Pub Date : 2024-06-01 DOI:10.47176/jafm.17.6.2354

F. Yan, W. Kong, H. Jiao, F. Peng, J. Zhang

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引用次数: 0

摘要

本研究通过数值模拟和粒子图像测速仪研究了圆柱形气流穿过各种非对称凹槽结构时的阻力减小特性。重点研究了非对称凹槽数量对阻力特性的影响，包括平均阻力、频谱特性、时间平均流线、分离点预测、时间平均压力、尾流涡旋强度、雷诺应力和湍流动能。结果表明，不对称凹槽的存在对这些流动参数有显著影响。值得注意的是，四凹槽配置的改善效果最佳，表现在平均阻力系数（0.804）、涡流脱落频率（2.74 Hz）、再循环区域长度（1.208 D）和跨气缸压差（81.76）最低。此外，这种配置产生的尾涡最弱，最大雷诺应力（0.011）降低了 45%，最大湍流动能（0.05）降低了 40.5%。因此，不对称凹槽的存在对圆柱形流动特性有显著的积极影响，尽管改善程度随着凹槽数量的进一步增加而降低。

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Flow Characteristics of Cylinders with Asymmetric Grooves: A Modeling and Experimental Study

This study examined the drag reduction properties of cylindrical flows across various asymmetric notched structures through numerical simulation and particle image velocimetry. The focus was on investigating the influence of the number of asymmetric grooves on the drag characteristics, including the mean drag, spectral characteristics, time-averaged streamlines, separation point prediction, time-averaged pressure, wake vortex strength, Reynolds stress, and turbulent kinetic energy. The results showed that the presence of asymmetric grooves significantly influenced these flow parameters. Notably, the improvement was optimal in the four-groove configuration, evidenced by the lowest mean drag coefficient (0.804), vortex shedding frequency (2.74 Hz), recirculation area length (1.208 D ), and pressure difference across the cylinder (81.76). Moreover, this configuration resulted in the weakest trailing vortex, a 45% reduction in the maximum Reynolds stress (0.011), and a 40.5% decrease in the maximum turbulent kinetic energy (0.05). Thus, the presence of asymmetric grooves had a significant positive effect on the cylindrical flow properties, though the degree of improvement decreased with further increase in the number of grooves.

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来源期刊

Journal of Applied Fluid Mechanics THERMODYNAMICS-MECHANICS

CiteScore

2.00

自引率

20.00%

发文量

138

审稿时长

>12 weeks

期刊介绍： The Journal of Applied Fluid Mechanics (JAFM) is an international, peer-reviewed journal which covers a wide range of theoretical, numerical and experimental aspects in fluid mechanics. The emphasis is on the applications in different engineering fields rather than on pure mathematical or physical aspects in fluid mechanics. Although many high quality journals pertaining to different aspects of fluid mechanics presently exist, research in the field is rapidly escalating. The motivation for this new fluid mechanics journal is driven by the following points: (1) there is a need to have an e-journal accessible to all fluid mechanics researchers, (2) scientists from third- world countries need a venue that does not incur publication costs, (3) quality papers deserve rapid and fast publication through an efficient peer review process, and (4) an outlet is needed for rapid dissemination of fluid mechanics conferences held in Asian countries. Pertaining to this latter point, there presently exist some excellent conferences devoted to the promotion of fluid mechanics in the region such as the Asian Congress of Fluid Mechanics which began in 1980 and nominally takes place in one of the Asian countries every two years. We hope that the proposed journal provides and additional impetus for promoting applied fluids research and associated activities in this continent. The journal is under the umbrella of the Physics Society of Iran with the collaboration of Isfahan University of Technology (IUT) .