固体发动机不同角度跌落数值模拟及试验分析

为了研究某型舰载固体发动机跌落的安全性问题,应用ANSYS/LS?DYNA有限元分析软件对固体发动机37.5 m高度的多角度跌落过程进行数值模拟分析,并开展真实发动机的跌落试验进行验证。结果表明,相同跌落高度下的危险角度为78°,通过推进剂点火增长模型计算得出发动机内部装药温升小于5 K,不会发生点火反应,发动机尾部与碰撞面接触的位置相对危险,壳体与内部装药的应力、应变值较大,可能产生断裂破坏。通过固体发动机跌落试验发现,发动机的尾部出现断裂破坏,但未发生点火或爆炸反应,试验采集的数据信息与有限元分析的结果一致。

Numerical Simulation and Experimental Analysis of Drop at Different Angle of Solid Rocket Motor

To study the drop safety problem of a certain type of ship board solid rocket motor, the numerical simulation and analysis for the multi angle drop process at drop height of 37.5 m of solid motor were carried out by using ANSYS/LS-DYNA finite element analysis software. The verified test for drop test of real motor was performed. The results show that the dangerous angle at the same drop height is 78°, the temperature rise of charge in the motor calculated by ignition and growth model is less than 5 K, and the ignition reaction does not happen. The contact position of motor tail with collision surface is relatively dangerous. The stress and strain values of shell and internal charge are large, which may generate fracture failure. Through the drop test of solid rocket motor, it is found that the tail of motor has a fracture damage, but the ignition or explosion reaction do not occur. Data information collected from the test is consistent with the results of finite element analysis. The rationality of the calculation method is verified.