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前置隔板对圆柱绕流影响的实验研究

周潇1,胡烨1,王晋军2   

  1. 1. 北京航空航天大学新主楼
    2. 北航航空学院
  • 收稿日期:2015-01-26 修回日期:2015-06-30 发布日期:2015-08-03
  • 通讯作者: 胡烨
  • 基金资助:
    基于RFID的车联网在ITS上应用的基础问题研究;博士后基金面上资助项目

Experiment on the flow past the circular cylinder attached to a frontal splitter plate

  • Received:2015-01-26 Revised:2015-06-30 Published:2015-08-03

摘要: 利用PIV测速方法在自循环水槽中研究了雷诺数为1800时,柔性和刚性两种不同刚度的前置隔板对圆柱绕流的影响。研究发现:柔性板自由端的弯曲增加了对流场的额外扰动,并且柔性隔板弯曲变形会诱导产生脱落涡,导致尾迹流场主频的变化。在圆柱下游,无隔板工况与柔性板工况的回流区长度相当,刚性板工况的回流区则更长一些。另外,两种控制工况都能在一定程度上减小圆柱绕流的阻力。

关键词: 圆柱, 涡结构演化, 前置隔板, 柔性材料, 水洞实验

Abstract: A frontal splitter plate was introduced to explore the influence on the flow past a circular cylinder in a water channel. Particle Imaging Velocimetry (PIV) was utilized to investigate the flow characteristics of the circular cylinder attached to a splitter plate with two different stiffness respectively at the Reynolds number of Re=1800. It is found that an additional perturbation owing to the bending deformation of the flexible plate results in the formation of vortex on the tip of the plate and even varies the dominant frequency in the flow field. In the downstream of the cylinder, the sizes of reverse flow region in the flexible plate condition and the no-plate condition are similar, while the size of reverse flow region in rigid plate condition is larger. The experiment results show that the drag force of the circular cylinder could be reduced either with a flexible plate or a rigid plate in the upstream.

Key words: circular cylinder, vortex structure evolution, frontal splitter plate, flexible material, water tunnel experiment

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