空泡尾部流场特性数值模拟研究

使用商用软件FLUENT6.0,对不同的空泡形态下空泡尾部的阻力特性进行了数值模拟研究.研究表明,随着通气率的增大和空泡形态的增长,运动体尾部阻力系数逐渐减小,并且在减小至谷底后又开始回升.尾部压差阻力系数大于粘滞阻力系数,二者均随着通气率的增加而减小.并且压差阻力系数在达到最小值后开始逐渐增大,因而使得总尾部阻力系数在减小至谷底后开始回升.运动体尾部沾湿长度随着通气率的增大而减小,尾部阻力系数则随着尾部沾湿长度的增大而增大.

Numerical simulation on character of the cavity wake region

In order to investigate the drag character of the aft section of underwater bodies at the different cavity shapes,numerical investigation was conducted using the commercial CFD software Fluent6.0. The investigation shows with the increasing of ventilation flow rate coefficient and development of cavity,the drag coefficient of the aft section decreases,and then increases when it drops to the minimum. Pressure drag is larger than viscous drag of the aft section,and both decrease when ventilation flow rate coefficient increases.The pressure drag starts to increase when it reaches the minimum,which makes the overall vehicle drag also increases when it reaches the minimum.The wetted length of the aft section decreases with the increasing of ventilation flow rate coefficient,and the drag coefficient of aft section increases when the wetted length increases.