前柱和后柱对并列双柱脉动压力的干扰

The Interference of A Third Cylinder on the Pressure Fluctuation of Two Cylinders in Side by Side Arrangement

本文研究了在并列双圆柱的正前方或正后方加上一个等直径的圆柱，组成等边三角形排列的三圆柱的脉动压力分布，着重研究前柱或后柱对并列双圆柱脉动压力分布的影响，同时还在相同的试验条件下，进行了并列双圆柱和三圆柱脉动压力的比较。结果表明，并列双圆柱前方或后方加上第三个圆柱形成的等边三角形排列的三圆柱，受影响最严重的是后排圆柱，脉动压力分布出现了严重的不对称，内侧的压力脉动极其强烈，外侧的压力脉动很弱，与时均压力分布有很好的对应关系。

in this paper, three cylinders are arranged as an equilateral triangle, two cylinders are in side by side, and the third one is in front of or in rear of the two cylinders. The pressure fluctuations of thses three cylinders has been studied. The comparisons were made between a group of three cylinders and the two cylinders in side by side. The results show us, the rear cylinder is affected more seriously. This is one of the cause of the collapse of the structures in groups.