考虑尾焰冲击的海上发射平台结构强度研究

Strength assessment of offshore launch platforms subjected to flame impact loading

海上发射平台具有移动性,可自由选择合适的发射海域,而火箭发射时的高温与冲击载荷会极大影响结构强度。针对某型海上发射平台,计算了7种水动力状态下,结构处于自航、自存以及发射工况下的强度。其中发射工况选取了点火瞬间、升空10 m以及升空30 m等3个时刻,并考虑导流槽的温度载荷与尾焰冲击载荷,同时考虑高温情况下板材许用应力的折减。计算结果表明,发射区域最大应力位于导流槽出口角隅处,对其原因做分析,为海上发射平台及其导流槽的设计提供了参考与建议。

Maritime launch platforms are mobile and free to choose the right launch area.The high temperatures and shock loads during rocket launch can greatly affect the structural strength.For an offshore launch platform,the strength of the structure was calculated under seven hydrodynamic conditions,including sail,survival and launch conditions.The launch conditions were selected from the moment of ignition,10 m lift-off and 30 m lift-off.The temperature and wake impact loads of the flame diversion trough are considered,as well as the reduction of the allowable stresses in the plate at high temperatures.The results show that the maximum stress in the launch area is at the corner of the flame diversion trough and the reasons for this are analysed,and provide references and suggestions for the design of offshore launch platforms and their flame diversion troughs.