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针对目前喷管喉衬背壁绝热层后效传热炭化缺乏定量分析的现状,通过材料模型、载荷模型的研究工作,建立能够满足喷管后效传热分析精度要求的喷管温度场有限元计算方法,并通过缩比试验喷管温度场计算与试验测试结果的对比分析进行验证。在此基础上,开展了背壁绝热层后效传热的仿真分析,掌握了后效传热炭化分析方法,并得到了解剖测试结果的验证。研究结果表明,背壁绝热层的炭化大部分发生在后效传热期间。利用该方法进行了全尺寸喷管的背壁绝热层后效炭化分析工作,提出了根据温度计算结果进行裕度评估的方法。评估结果表明,全尺寸喷管的背壁绝热层设计厚度有减薄空间。
In view of the lack of quantitative analysis of the post-treatment heat transfer charring of the back wall of the throat lining of the nozzle, the finite element method of the nozzle temperature field, which can meet the requirements of the post-injection heat transfer analysis accuracy, is established through the research of material model and load model. The calculation method is also validated by comparing the calculation of the nozzle temperature field and the experimental test results. On this basis, the simulation analysis of the aftertreatment heat transfer of the back wall heat insulation layer is carried out, and the method of post-heat transfer carbonization analysis is mastered, and the results of the anatomical test are verified. The results show that most of the carbonization of the back wall insulation occurs during the post-heat transfer. The back-wall carbonization analysis of the back wall thermal insulation of the full-size nozzle was carried out by this method, and a method of margin evaluation based on the temperature calculation result was proposed. The results of the assessment show that there is room for reduction in the design thickness of the back wall insulation of a full-size nozzle.