Thermal Modeling and Correlation of the Space Environments Complex Vacuum Chamber and Cryoshroud

Stalcup, Erik J

关键词: ALGORITHMS;    BACKGROUND RADIATION;    COMPRESSORS;    ERROR ANALYSIS;    HEAT EXCHANGERS;    ROOT-MEAN-SQUARE ERRORS;    THERMAL ANALYSIS;    THERMAL VACUUM TESTS;    AEROSPACE ENVIRONMENTS;    FINITE DIFFERENCE THEORY;    HEAT FLUX;    LOW TEMPERATURE;    TEMPERATURE MEASUREMENT;    THERMAL RADIATION;   

RP-ID  :  GRC-E-DAA-TN60182

学科分类：工程和技术（综合）

美国|英语

来源: NASA Technical Reports Server

【 摘 要 】

A thermal model of the Space Environments Complex (SEC) vacuum chamber and cryoshroud has been developed in support of upcoming thermal vacuum/thermal balance testing for Orion EM-1. The model was developed in Thermal Desktop and includes the vacuum chamber itself, a fluid model of the gaseous nitrogen flowing through the cryoshroud and the chamber piping, the Heat Flux System (HFS) within the cryoshroud, and the mechanical ground support equipment (MGSE) that interfaces with the vehicle. It has been correlated with steady state data from three tests. Two tests ran the cryoshroud in hot mode at 170 °F, and one test ran the cryoshroud in cold mode at -263 °F. Correlation was done using an optimization algorithm to find values of unknown contact conductances that minimized the RMS error between the model predictions and the test data. Overall, model quality was very good with a total RMS error of 2.6 °F.