Abstract: The offshore launch platform considering the thermal launch of a rocket at sea has been studied. The Realizable k-ε turbulence model and the three-dimensional potential flow theory are used to study the time-domain motion response of the platform under the impact load of the rocket wake and the combined loads of the wind, wave and current. The heave, roll, pitch and yaw of the launch platform during offshore launching under two sea states are compared and analyzed. The analysis and calculation show that one sea state is more beneficial to the two-way safety of the rocket and the launch platform than the other, and the launch platform should avoid offshore thermal launching in beam waves. In addition, a simple calculation method of the wake impact under offshore launch condition is proposed to obtain the pressure time history of the gas wake impact for single Laval tube, providing theoretical and engineering foundation for the subsequent study of the structure and motion performance of the launch platform.

Key words: offshore launch platform, thermal launch, wake impact, motion response

摘要： 在海上火箭热发射工况下,以海上发射平台作为主要研究对象,基于Realizable k-ε湍流模型以及三维势流理论,进行火箭尾流冲击载荷以及风、浪、流联合作用下的平台时域运动响应研究。对比分析了2种海况下海上发射期间发射平台的垂荡、横摇、纵摇以及艏摇4个方向的运动,通过分析计算,海况一比海况二更有利于火箭和海上发射平台的双向安全且应避免发射平台横浪时进行海上热发射。此外,提出了1种海上发射工况下尾流冲击的简易计算方法并得到了单拉瓦尔管燃气尾流冲击的压强时历曲线,为后续发射平台的结构性能以及运动性能研究奠定了理论和工程基础。

关键词: 海上发射平台, 热发射, 尾流冲击, 运动响应