大推力发动机高温隔热屏设计及优化研究

以卫星用大推力发动机高温隔热屏为研究对象,根据传热机理建立了其瞬态传热模型。对不同边界温度条件下高温隔热屏的瞬态传热过程进行数值仿真,且经对比,仿真计算出的隔热屏温度值与试验结果吻合良好,验证了模型的准确性和适用性。利用该模型设计了某卫星高温隔热屏,并分析了隔热屏覆盖层发射率、反射屏发射率、比热容等对隔热屏瞬态隔热性能的影响。研究结果为隔热屏的设计和优化提供了依据。

Design and optimization of high temperature heat shield for large thrust engines

The heat shield with large thrust engines is taken as the research object, and a numerical thermal model is established according to the heat transfer mechanism. The transient heat transfer process of the heat shield is simulated for different marginal temperatures, and the calculation results of the transient temperature of the heat shield are in good agreement with the experimental ones, thus the accuracy and the applicability of the model are verified. The heat shield for a certain detector is designed according to this model and the influence factors on the transient heat transfer performance are analyzed. This study provides a basis for the design and the optimization of the heat shield.