方柱的涡脱落频率及端部影响的风洞实验

Tunnel ExperimentS on the Frequency of Vortices Shedding from a RectangularCylinder and End Effects

本文报告了用压力传感器测量方形柱体涡脱落的实验方法和结果。实验在大气边界层风洞进行。方柱的截面为正方形，高宽比为５。压力传感器在测试前经过严格的标定。测量结果表明，随着来流速度沿高度的变化，方柱的涡脱落频率也随高度而变，而且，在柱体端部附近，涡脱频率和批数发生明显的抑制。和二维柱体一样，在一定的Ｒｅ数范围内，三维柱体的Ｒｏ数与Ｒｅ数也存在一种线性关系。

ExperimentS have been carried out in a wind tunnel to measure the vortex frequency.shedding from a rectangular cylinder with pressure traneducers.The calibration of the Pressure transducers was reported. The experimenta] results indicate that the frequency of vortex shedding varies along the height of the prism, and in the end of the prism, the vortex shedding frequency is reStrained. The linear relation between Roshko number and Reynolds number was obtained.