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。文中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。
Abstract
When supercavitating projectile moves at high speed, the periodic impacts (“tail-slap”) with interior surface of the cavity generally occur, and the motion of projectile will be influenced by the effect of fluid compressibility. By considering the coupling effect of fluid and structure, the dynamic equation of supercaviting projectile with no constraints has been established and solved by finite element method. The dynamic behaviour of supercavitating projectile operating in tail-slap conditions is obtained. Furthermore, the influence of Mach number has been investigated. The results show: in subsonic flows, the amplitude and cycle of elastic displacement responses increase by the effect of fluid compressibility; with the increment of Mach number, the influence of fluid compressibility on structural elastic displacement responses is more and more apparent.
关键词
超空泡射弹 /
尾拍 /
亚音速流 /
动力学响应 /
有限元法
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Key words
Supercavitating projectile /
Tail-slap /
Subsonic flows /
Dynamic response /
Finite element method
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魏英杰;何乾坤;王聪;曹伟;张嘉钟.
亚音速超空泡射弹尾拍动力学响应分析[J]. 振动与冲击, 2012, 31(18): 67-72
Wei Yingjie He Qiankun Wang Cong Cao Wei Zhang Jiazhong .
The Responses of Impact Dynamics of Supercavitating Projectile in Subsonic Compressible Fluid Flow[J]. Journal of Vibration and Shock, 2012, 31(18): 67-72
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