亚音速超空泡射弹尾拍动力学响应分析  

Impact dynamic responses of a supercavitating projectile in subsonic compressible fluid flow

作　　者：魏英杰[1] 何乾坤[1] 王聪[1] 曹伟[1] 张嘉钟[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》2012年第18期67-72,共6页Journal of Vibration and Shock

基　　金：国家自然科学基金资助项目(10802026);中央高校基本科研业务费专项资金资助(HIT;NSRIF;201159)

摘　　要：超空泡射弹在运动过程中存在尾拍现象,在高速运动条件下,水的可压缩性是影响射弹尾拍运动的主要因素之一。考虑了流体与结构相互耦合的影响,建立了射弹尾拍运动的无约束动力学方程,使用有限元法求解得到了超空泡射弹在尾拍载荷作用下的动力学响应,并研究了马赫数对射弹动力学响应的影响。研究结果表明:亚音速条件下,流体的可压缩性使超空泡射弹刚体转动和弹性振动位移的周期和幅值增大;流体的可压缩性对结构弹性位移响应的影响随马赫数的增大而逐渐增大。When a supercavitating projectile moves at a high speed, the periodic impacts （tail-slap） on the interior surface of the cavity generally occur, and the motion of the projectile is influenced by the effect of fluid compressibility. By considering the coupling effect of fluid and structure, the dynamic equation of the supercaviting projectile with no constraints was established and solved with the finite element method. The dynamic behaviour of the supercavitating projectile under tail-slap conditions was obtained. Furthermore, the influence of Maeh number on the dynamic responses of the projectile was investigated. The results showed that in subsonic flow, the amplitude and period of the elastic displacement and the rigid rotation of the projectile increase due to the effect of fluid compressibility; with increase in Mach number, the influence of fluid compressibility on structural elastic displacement responses grows.

关 键 词：超空泡射弹 尾拍 亚音速流 动力学响应 有限元法 

分 类 号：O342[理学—固体力学] O353[理学—力学]