矩形管道内低雷诺数圆柱绕流尾迹演化特性

发布时间：2018-04-14 19:46

本文选题：圆柱绕流 + 尾迹演化　；参考：《中南大学学报(自然科学版)》2016年01期

【摘要】：为了揭示有限管道壁面对圆柱绕流尾迹演化特性的影响,采用基于有限容积法的数值模拟方法,对矩形管道内雷诺数为100的三维圆柱绕流尾迹流场进行计算分析,探讨阻流比和长径比对圆柱表面和尾迹流场中压力分布的影响。研究结果表明:圆柱前、后驻点的压力系数受展向位置影响较大,后驻点压力系数与旋涡脱落状态有关;时均压力系数受管道端壁影响显著,沿前驻点至后驻点圆柱表面时均压力系数先减小后增大;在远离端壁一定区域内,尾迹流态为涡街;而在靠近端壁的一定区域内,尾迹呈现出近似双子涡形态;圆柱表面相同位置处的时均压力系数基本上随阻流比的增大而增大,随长径比的增大而减小。
[Abstract]:In order to reveal the influence of the evolutional characteristics of the wake around a cylinder on the wall of a finite pipeline, a numerical simulation method based on the finite volume method is used to calculate and analyze the wake flow field of a three-dimensional cylinder with Reynolds number of 100 in a rectangular pipe.The effects of ratio of resistance to flow and ratio of length to diameter on pressure distribution on cylinder surface and wake flow field are discussed.The results show that in front of the cylinder, the pressure coefficient of the rear stop point is greatly affected by the spanned position, the pressure coefficient of the rear stop point is related to the vortex shedding state, and the time average pressure coefficient is significantly affected by the end wall of the pipe.The average pressure coefficient decreases first and then increases along the front stop point and then increases; in a certain region far away from the end wall, the wake flow is a vortex street, but in a certain region near the end wall, the wake appears to be similar to the binary vortex shape.The time-averaged pressure coefficient at the same position on the cylinder surface increases with the increase of the resistance flow ratio and decreases with the increase of the aspect ratio.
【作者单位】：中南大学能源科学与工程学院;
【基金】：国家自然科学基金资助项目(51006125) 中南大学教师研究基金资助项目(2013JSJJ018)~~
【分类号】：O357.5

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