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曲面头部的水弹高速冲击刚性表面的流体动力学问题,可以归结为无粘性、可压缩的不定常流动问题,受轴向对称园柱座标的连续和动量方程、水的等熵状态方程支配。考虑不可滑移的刚壁边界条件,用欧拉——拉格朗日结合的数值计算方法,进行数值求解。计算结果表明:在压力峰值形成的同时,引起了比冲击速度大得多的侧向速度;在较低的冲击马赫数范围内,作用时间近似地和冲击马赫数无关;压力峰值和测向速度都是沿着径向向外递增,这和实验结果一致。
The hydrodynamic problem of the high-speed impact rigid surface of the curved head can be attributed to the non-viscous and compressible unsteady flow problem, which is governed by the continuous and momentum equations of axially symmetric cylindrical coordinates and the isentropic equation of water . Considering the non-slip boundary condition of the rigid wall, the Euler-Lagrange numerical method is used to solve the problem. The results show that at the same time as the pressure peak is formed, a much greater lateral velocity than the impact velocity is induced; at lower impact Mach numbers, the action time is approximately independent of the impact Mach number; the pressure peak and the direction velocity Both are increasing radially outward, which is consistent with the experimental results.