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为得到双脉冲发动机隔舱结构关键部件金属膜片适宜结构,通过圆板大挠度理论和断裂力学理论推导出金属膜片预制缺陷处应力强度因子计算公式,得到金属膜片在内压作用下的设计方法,建立了膜片破坏压强与结构尺寸之间定量关系,并通过6次膜片动态破坏单项实验验证了其正确性。在此基础上,利用缩比发动机分别开展了隔舱热流承压、热流打开、热流联合实验以进一步考核隔舱的工作特性。结果表明:所导出的金属膜片设计方法与实验结果较为一致,平均误差约4.394%,可以用于脉冲发动机膜片具体结构尺寸设计;隔舱承压、密封、打开、消融性能良好,可以较好满足双脉冲发动机使用要求。
In order to get the suitable structure of the metal diaphragm of the key component of double-pulse engine compartment structure, the formula of stress intensity factor at the prefabricated defect of the metal diaphragm is deduced from the theory of large deflection of disc and the theory of fracture mechanics. Design method, the quantitative relationship between the pressure and the size of the diaphragm was established, and the correctness of the test was verified by six experiments on the dynamic damage of the diaphragm. On this basis, the compression engine was used to carry out the compartment heat flow pressure, heat flow open, heat flow joint test to further assess the working characteristics of the compartment. The results show that the design method of the metal diaphragm is consistent with the experimental results, with an average error of about 4.394%, which can be used to design the structure of the pulse motor diaphragm. The compartment is pressure-tight, sealed and open with good ablation performance. Good to meet the dual-pulse engine requirements.