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应用有限元软件开展了燃烧室外压稳定计算,以壳体表面环向应变为判据,从环向应变-载荷曲线保守估算了燃烧室外压失稳载荷。为了验证有限元计算模型,通过假药配方的调试,研制外压试验用模拟燃烧室,开展全尺寸模拟燃烧室外压试验,得到了燃烧室失稳载荷。通过计算与试验结果的比较分析,为有限元模型的修正提供了基础,采用推进剂的压缩模量进行燃烧室外压稳定性计算更接近实际情况。
The steady pressure calculation of combustion chamber was carried out by finite element software. Based on the circumferential strain of the shell surface, the buckling load of the combustion chamber was conservatively estimated from the circumferential strain-load curve. In order to verify the finite element model, through the debugging of counterfeit prescription, the simulation combustion chamber for external pressure test was developed and the full-scale simulation combustion chamber external pressure test was carried out. The load of combustion chamber instability was obtained. Comparing and analyzing the results with the experimental results provides the foundation for the modification of the finite element model. The compression modulus of the propellant is used to calculate the stability of the combustion chamber pressure closer to the actual situation.