通气超空泡自激振荡和受迫振荡的数值仿真研究  

NUMERICAL SIMULATION FOR SELF-OSCILLATION AND FORCED OSCILLATION OF A VENTILATED SUPERCAVITATION

作　　者：张学伟 张嘉钟[1] 魏英杰[1] 王聪[1] 

机构地区：[1]哈尔滨工业大学航天学院,哈尔滨150001

出　　处：《振动与冲击》2008年第10期51-55,74,共6页Journal of Vibration and Shock

摘　　要：根据Logvinovich独立膨胀原理发展了一种用于计算非定常通气超空泡形态的计算方法,并运用该方法对通气超空泡自激振荡和受迫振荡过程进行了数值仿真研究。研究表明:当超空泡发生自激振荡时,空泡内部压力和空泡长度发生周期或准周期振荡。超空泡自激振荡模式主要与气体弹性,通气率和泄气率有关。当超空泡发生受迫振荡时,空泡内部压力和空泡长度也会发生周期或准周期振荡,受迫振荡模式与扰动方式以及自激振荡模式有关。A numerical method is put forward to calculate unsteady ventilated supercavitation based on principle of Logvinovich of cavity sections expansion.The process of self-oscillation and forced oscillation of a ventilated supercavitation is simulated by this method.The results indicate that the pressure and the length of the ventilated supercavitation show a periodic or quasi-periodic pulsation when its self-oscillation takes place,the modes of its self-oscillation relate to gas elasticity,air-supply rate and air leakage rate.The pressure and the length of the ventilated supercavitation also show a periodic or quasi-periodic pulsation when its forced oscillation takes place,the modes of its forced oscillation relate to forms of disturbance and modes of its self-oscillation.

关 键 词：通气超空泡 独立膨胀原理 自激振荡 受迫振荡 非定常数值仿真 

分 类 号：TV131.2[水利工程—水力学及河流动力学]