绕Hydronautics水翼空化云流动的实验研究

采用高速全流场显示技术和DPIV对空化水翼近壁处的空化云流动形态和运动机理进行了讨论.结果表明:绕Hydronautics翼型的空化云运动是一个准周期性过程:稳定空泡团初生在翼型前部,向翼型后部发展布满整个翼面,在翼型后缘出现汽泡团旋涡,伴随反向运动,最终向下游脱落.当前条件下空泡团旋涡脱落周期约为74 ms.空化区与主流区的交界面上存在较大的速度梯度,一组对涡出现在翼型尾部处交界面上.此外,采用以空泡为示踪粒子的DPIV能够对空化流动流速分布进行有效测量.

EXPERIMENTAL STUDY OF CLOUDY CAVITATING FLOWS AROUND A HYDRONAUTICS FOIL

The cloudy cavitating around a hydronautics foil has been experimentally studied by means of high-speed fluid visualization and DPIV.The research summarized in terms of the following results: the cloudy cavitation motion around the hydronautics foil is periodical and the shedding frenquence is about 74ms under the experimental condition.The first cavity on the front of foil is stable.When the developing cloudy cavitation cover the whole section surface of the foil a shear layer flow with larger vorticity is observed.The velocity of the cavitating vortical area is lower than the mainflow.In addition,DPIV is valid for the velocity measurement of cavitating flows.