Modeling of Martian atmospheric high temperature spectra and prediction of non-equilibrium radiative heating

LYU Junming; LI Fei; LI Qi; CHENG Xiaoli

doi:10.7527/S1000-6893.2021.26551

ACTA AERONAUTICAET ASTRONAUTICA SINICA >

2022 , Vol. 43 >Issue 3: 626551 - 626551

DOI: https://doi.org/10.7527/S1000-6893.2021.26551

Modeling of Martian atmospheric high temperature spectra and prediction of non-equilibrium radiative heating

LYU Junming ,
LI Fei ,
LI Qi ,
CHENG Xiaoli

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1. China Academy of Aerospace Aerodynamics, Beijing 100074, China;
2. Aerospace Vehicle Thermal Protection Laboratory, China Aerospace Science and Technology Corporation, Beijing 100074, China;
3. State Key Laboratory of High Temperature Gas Dynamics, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China;
4. Beijing Institute of Spacecraft System Engineering, Beijing 100094, China

Received date: 2021-10-25

Revised date: 2021-11-03

Online published: 2021-12-01

Supported by

National Natural Science Foundation of China (11772315,11902025)

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Abstract

The aerothermodynamics data reconstructed after the successful landing of Mars Science Laboratory shows that radiative heating has an important impact on the design of thermal protection system of Mars entry vehicles, which is different from previous understanding.However, there are still unknown mechanism and model uncertainty need to be studied.Due to the high-temperature and non-equilibrium in the high-speed entry, the aerothermal environment is different from that of conventional CO₂ infrared radiation study.Firstly, a high-temperature non-equilibrium spectral radiation model applicable for Martian atmosphere has been established to obtain the spectral structure and radiation intensity, which in turn, were compared with test results from NASA and JAXA, and agreed well. Secondly, the radiation intensity under typical Mars entry velocity has been obtained by both computational method and experiment using shock tube and emission measurement techniques; the results of computation and test are in good agreement with NASA test results, validating the flow and spectrum models. Finally, numerical simulations and analysis of aero-radiation on Pathfinder have been conducted, non-equilibrium flow filed and radiation characteristics under typical conditions were completed, the spectral radiance along stagnation line based on ray tracing method was obtained, indicating that there is a significant difference between the aerodynamic radiation mechanism under high-speed and low-speed conditions; the radiative heating rate distribution on the surface was obtained based on finite volume method, and the results show the distribution and change of the radiative heating is significantly different from the reentry of the earth.The radiative heating rate decreases with the increase of the entry speed when the entry speed is below 6 km/s, and the radiative heating rate on the cone and shoulders is higher than the stagnation region.

Key words： Mars entry; thermal protection design; aerothermodynamics; aero-radiation; non-equilibrium flow; spectral radiation intensity; radiative heating

Cite this article

LYU Junming , LI Fei , LI Qi , CHENG Xiaoli . Modeling of Martian atmospheric high temperature spectra and prediction of non-equilibrium radiative heating[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2022 , 43(3) : 626551 -626551 . DOI: 10.7527/S1000-6893.2021.26551

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