三圆柱串列水流流速特性试验研究

Study on Flow Characteristics of Serial Three-Cylinder

通过对间距为4D和8D(D为圆柱直径)时的三圆柱串列水流流速分布进行了试验分析,由试验结果可知:在横断面上,由于桩的阻力和前柱尾流区存在的漩涡,水流向阻力小的无桩区转移,动量向水槽边壁呈近似波状传递;无桩区附近流速增大,流速的改变趋势沿水槽中心基本呈对称分布;两种间距试验结果比较发现:桩柱间距越大,流速减小幅度越小,流速改变波及面越小。

In this paper, the velocity distribution of serial three-cylinder at 4d （d is the diameter of cylinder） and 8d was tested. We find that in the cross section, the stream current flow to no-cylinder area and the momentum transferred to the adjacent water channel because of resistance of the cylinder and the spiral vortex of the wake zone caused by the front cylinder, velocity enlarged around the no-cylinder area and alternated basically in symmetry;For different spacing, there are different impacts on the water, the greater the spacing, the smaller reducing the rate of flow velocity around the pile, the smaller magnitude areas of velocity change.