远地点发动机热防护模型

针对多参数、强热耦合发动机热防护模型修正的难题，通过分析系统的传热特点，提出热环境分级、热参数分类的单参数调试方法。通过分析传热关系，将系统分为两级热环境；在每级热环境中仅调节几个参数，减少了调试工作量。通过分析热阻网络，确定了待定参数；通过分析参数的影响程度，确定参数的修正顺序。以具有代表性的两颗导航卫星为研究对象，利用I-DEAS TMG软件对发动机热影响过程进行仿真。调试结果表明:热模型的精度控制在2℃以内，提高精度后的热模型可用来验证、指导热控设计。单参数调试方法的原理基于各参数对不同部件的影响程度不同，可经有限次调试快速获得高精度、稳定的结果。单参数调试方法可用于解决工程实践中的多参数耦合问题。 

Thermal protection model of apogee engine

To solve the problem of modifying thermal model on thermal protection of apogee engine with multi-parameter and strongly thermal coupling, a single-parameter modified method was proposed by grading thermal environment and classifing thermal parameters. By analysing heat transfer network,the system was divided to two thermal environments. Only few parameters were debugged in each thermal environment. By analysing thermal resistance network, the undetermined thermal parameters were figured out. By analysing the influence degree of parameters, the debugging sequence was determined. The temperatures of two Beidou Navigation satellites were employed. The thermal model was built by I-DEAS TMG. The debug result showed that all the temperature deviations were less than 2℃, so the modified thermal model can be used to verify and optimize thermal protection design. The principle of single-parameter modified method was based on different influence degrees of the undetermined parameters. Through several times debugging, the problem can be solved with high precision and stability. The single-parameter modified method is available to debug multi-parameter and strongly thermal coupling model.