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.