The thermal protection technology for the large thrust landing engine is crucial for the safety of Martian landing mission.When the conventional high-temperature thermal shield based on the multi-stage heat radiation reflection structure is used in the Martian atmospheric environment, its heat insulation performance is significantly attenuated due to internal convection heat transfer.To solve this problem, a new type of engine thermal protector is developed based on the aerogel material.According to the operation environment for Mars exploration mission, transient simulation models with both low-pressure atmosphere and high-temperature heat flux boundaries are established, and the key design parameters such as shape taper and material thickness are optimized.The effectiveness of the design is verified by three-dimensional transient simulation analysis and the ground test with landing engine.The aerogel-based thermal protector has been successfully applied to the Tianwen-1 Mars lander, which has effectively shielded the landing engine from a high temperature of 1500℃.Based on the analysis of on orbit telemetry data, directions for improving the high temperature insulation technology based on the aerogel material are proposed.
ZHENG Kai
,
RAO Wei
,
XIANG Yanchao
,
ZHANG Dong
,
ZHANG Bingqiang
,
XUE Shuyan
,
DAI Chenghao
,
YE Qing
. Design of aerogel-based thermal protector for Mars landing engine[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2022
, 43(3)
: 626568
-626568
.
DOI: 10.7527/S1000-6893.2021.26568
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