通气超空泡形态及其稳定性实验研究

通过在水洞中开展的系列实验对通气超空泡形态及其稳定性进行了研究．研究表明，重力对通气过程和关气过程所形成的通气超空泡影响不同，但超空泡轴线变形量都以非线性方式增长．当重力影响较小时，在相同空泡数下，通气超空泡与自然超空泡在形状和尺度上基本相似，并且两者的长细比都随着空泡数的增大而减小．通气超空泡形态不稳定主要有3种表现形式：气泡振荡、空泡界面波动以及空泡界面扭动，它们特点各异，对空泡产生的影响也不同．

Experimental research on ventilated cavitation and its stability

Ventilated cavitation and its stability were studied through a series of water tunnel experiments.The results show that the effects of gravity on ventilated cavitation formed by increasing and decreasing air volume are different,but axial deformations of ventilated cavitation all increase non-linearly.When the effect of gravity is small,the shapes and dimensions of ventilated and natural cavitation are essentially similar if the cavitation numbers are identical,and their aspect ratios will decrease along with increasing cavitation number.Three forms of instability in ventilated cavitation were observed: bubble oscillation,fluctuation of cavitation interface,and twisting of cavitation interface.Their effects on cavitation are different due to their different characteristics.