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用二维轴对称有限元热模型对IUS固体发动机喷管进行了全范围的热模拟。该模型考虑了瞬时加热,内部热分解,挥发性和活性分解产物的放出,辐射边界的相互作用,二维两相流中的粒子辐射,以及空腔的瞬间充气。分析时考虑两种情况:(1)假定所有接合密封面部完好地发挥作用,但热解挥发物和一些固体扩散的气体仍会引起结构局部加热,(2)考虑某些密封面泄漏,引起喷管结构内局部加热的最坏情况。对发动机点火试验进行了广泛的仪器测试。得出实测热电偶响应,它可与包括在两种假设情况内的子结构气流加热模型預示范围相比较。这种温度响应大于不考虑气流加热时所算出的结果。
A full-range thermal simulation of the IUS solid engine nozzle was performed using a two-dimensional axisymmetric FEA thermal model. The model takes into account transient heating, internal thermal decomposition, emission of volatile and active decomposition products, interaction of radiation boundaries, particle radiation in two-dimensional two-phase flow, and instantaneous inflation of the cavity. Two cases are considered in the analysis: (1) Assuming that all bonding sealing surfaces function well, pyrolytic volatiles and some solid-diffusion gases may still cause local heating of the structure, (2) Considering some sealing surface leakage, causing spray The worst case of localized heating in the pipe structure. A wide range of instrumentation tests have been performed on engine ignition tests. The measured thermocouple response is obtained which is comparable to the predicted range of the substructure airflow heating model included in the two hypothetical cases. This temperature response is greater than without considering the results of airflow heating.