预置舵角对高速入水弹道和流体动力的影响

Influence of preset rudder angle on trajectory and hydro-dynamic at high-speed water-entry

为了实现导弹以反复入水方式进行末段突防,需要形成向上弯曲的弹道,考虑采用预置舵角的方法迫使弹体在超空泡流动条件下作抬头转动,依靠攻角产生的尾部滑行力提供转平所需的法向过载。本文研究了具有细长前锥段外形的超空泡导弹在高速入水时弹道和流体动力的情况。利用动网格技术控制弹体以及整个计算区域的运动,采用Mixture方法描述气-液界面的运动变化;通过流场-弹道耦合方法,分析了通气条件下,0°~30°范围内不同预置舵角下入水弹道与流体动力的变化规律。研究结果表明,预置舵角可以控制弹道转平,且预置舵角越大弹道越容易转平。

To realize the missile terminal penetration method with repeatedly water-entry and water-exit,the trajectory needs curve upward. So the preset rudder angle method is considered to force the missile turn the rise, and the normal overload making the missile horizontal orientation are gained depending on the tail glide force from angle of attack. The trajectory and hydro-dynamic of a model are studied in the high-speed water-entry process. And the model with cone-shaped segment has slendersuper-cavity missile shape. The dynamic meshes are used to control the motions of the missile and the calculated zone, mixture model is used to capture the movement of the air-water interface. Through the flow field- trajectory coupling, the changing law of the trajectory and hydro-dynamicare gained in the ventilated condition with different preset rudder angle in the range of 0 degree to 30 degrees at high-speed. The result shows that the preset rudder angle can realize the horizontal orientation control, and the larger the preset rudder angle is, the easier the horizontal orientation control.