波浪条件下小型回转体高速入水动力学特性研究

Dynamic Characteristics of High Speed Water Entry of Small Rotary Bodies under Wave Conditions

摘要:

采用光滑粒子流体动力学（SPH）方法，建立了刚体入水六自由度响应模型，实现了波浪环境下小型回转体高速入水过程的数值模拟。对波浪环境下小型回转体高速入水过程中的运动姿态、冲击载荷进行讨论分析，结果表明：波浪条件下入水点相位不同，导致回转体实际入水角不同，实际入水角越大，入水冲击载荷越大，弹道越稳定；实际入水角越小，入水冲击载荷越小，弹道越易发生失稳。本研究表明，入水点相位对小型回转体弹道特性和冲击载荷产生影响，进而为波浪条件下跨介质武器低载稳定入水提供基础性技术支撑。

Abstract:

A six-degree-of-freedom response model for a rigid body entering water is established by using smooth particle fluid dynamics（SPH）method，and the numerical simulation of the high-speed water entry process of the small rotary body in wave environment is realized. The motion attitude and impact load of the small rotary body during high speed water entry under wave environment are discussed and analyzed. The results show that the actual entry angle of the rotary body is different due to the different phases of water entry points under wave conditions. The larger the actual entry angle is，the greater the impact load is and the more stable the trajectory is. The smaller the actual water entry angle is，the smaller the impact load is and the less stable the trajectory is. This study shows that the phase of water entry point affects the ballistic characteristics and impact load of the small rotary body，which provides basic technical support for the low-load stable water entry of cross-medium weapons under wave conditions