Radiative Heating Indicators and Uncertainty Analysis for Mars 2020

Brandis, Aaron ; Johnston, Christopher ; Edquist, Karl

关键词: RADIATION;    HEATING;    INDICATORS;    MARS MISSIONS;    CARBON DIOXIDE;    SPACECRAFT DESIGN;    SPACE FLIGHT;    DATA REDUCTION;   

RP-ID  :  ARC-E-DAA-TN58070

学科分类：力学，机械学

美国|英语

来源: NASA Technical Reports Server

【 摘 要 】

This paper will present analysis to evaluate a functional form and associated parameters to determine the radiative heating at various back-shell locations of the Mars 2020 aeroshell. The radiative heating indicators are used for preliminary vehicle design, and to determine the worst-case trajectories for peak radiative heat flux and load. Historically, the functional form for radiative heating is based on free-stream parameters of density, velocity and a length scale, typically the nose-radius (or equivalent). However, a fit of this form has been shown to not provide significant enough accuracy when compared to simulation results. Therefore, a fit based on post-shock equilibrium calculations of CO and CO2 number density, temperature and pressure has been devised. The results from the TPS 15 01 trajectory were used to develop the fit. The fit was then applied to the MSL best estimated trajectory (BET). Furthermore, the paper will quantify the uncertainty in simulations of the radiative heating for Mars 2020.