自旋前伸空化回转体高速斜入水稳定性仿真研究

Stability Simulation on High-speed Water Entry with Certain Angle of Self-spin Forward-extended Cavitating Body

摘要:

利用 Lagrange 结构网格和 Euler 流场网格(L/E)耦合的建模方法，建立了尖头回转体和前伸空化回转体高速自旋 45°角斜 400 m/s 速度入水仿真模型。通过对比 2 种回转体入水后质心弹道轨迹和攻角变化可以发现，高速自旋的尖头回转体入水后弹道发散明显，且发生姿态失稳；前伸空化回转体可以有效减少入水后的弹道发散，入水 4 m 后仍能保持较好的斜射姿态。研究结果表明：对于高速自旋入水工况，前伸空化回转体具有较高的入水弹道稳定性。

关键词:空化;高速入水;倾斜入水;高速自旋

Abstract:

The high-speed water entry models of pointed-head self-spin body and forward-extended cavitating body with 45°water-entry angle and 400m/s high-speed were simulated，by the use of modeling methods of Lagrange structure mesh and Euler fluid mesh. By comparison of the centroid trajectory and the conversion of attack angle after water entry of the two self-spin body models，it is shown that the water-entry trajectory of pointed-head self-spin body in high speed is divergent，and its attitude is unstable. Whilst，it is indicated that the self-spin forward-extended cavitating body can reduce the trajectory divergence after water entry effectively，and maintain a stable oblique fire attitude even after reaching 4 meters under the water. The result of this study shows that in the working condition of high-speed self-spin water entry，the trajectory after water entry of self-spin forward-extended cavitating body has good stability.

Key words:cavitating;high-speed water entry;oblique water entry;rapidly self-spinning