火箭橇水刹车高速入水冲击数值模拟

针对目前对火箭橇水刹车高速撞水研究的不足,采用流固耦合方法进行了数值研究,得到了超空泡、水隆起、溅水、水压力等水形态,获得了水刹车的速度、加速度和阻力系数随时间的变化曲线。研究表明:水刹车刀片和侧板头部形成的超空泡对水阻力影响最大、水隆起影响次之、溅水则基本无影响,水刹车阶梯式入水结构可以有效降低入水冲击力峰值。所采用的方法为火箭橇水刹车设计提供了依据,可为其他相关物体高速入水问题研究提供参考。

Numerical simulation on rocket sled water-brake high-speed water-entry impact

In allusion to lack research of rocket sled water-brake high speed entering into water,the method of fluid-solid coupling was used to numerically research.The modalities of water were calculated such as supercavitation,uplist,spatter and pressure.The velocity,deceleration and resistance coefficient varied with time of water-brake were gained.Numerical research shows as follows: the supercavitation generated from water-brake's knife bit and side board nose affects the water resistance heavily,water uplist af...