火星大气模型参数对MSL气动特性的影响

发布时间：2018-05-17 07:11

本文选题：火星大气模型 + 高超声速　；参考：《空间科学学报》2014年04期

【摘要】：火星大气与地球大气截然不同,飞行器在进入火星时气动特性不同于地球再入.大气模型的差异主要表现为气体组份、密度和温度等物理参数.针对火星进入器MSL在进入-下降-着陆过程中的高超声速进入段,利用三维并行程序求解耦合真实气体模型的流体动力学Navier-Stokes方程,分析MSl进入火星大气时大气模型参数对进入器气动特性的影响.结果表明,通过与海盗号飞行数据的对比,验证了所采用的火星气体模型和计算方法,且其与NASA的LAURA代码气动特性计算结果也较为一致;大气模型气体性质,即C0_2环境对进入器阻力系数和俯仰力矩系数影响较大,利用空气得到的计算和实验数据必须考虑C0_2效应;密度增大促进了化学非平衡效应,但对进入器气动特性基本没有影响;温度升高大大增强了化学非平衡效应,而对进入器气动特性影响较小.
[Abstract]:The atmosphere of Mars is very different from that of the earth, and the aerodynamics of spacecraft entering Mars is different from that of re-entry. The difference of the atmospheric model is mainly represented by the physical parameters such as gas composition, density and temperature. In view of the hypersonic entry phase of MSL in the process of entry, descent and landing, the Navier-Stokes equation of fluid dynamics coupled with real gas model is solved by using a three dimensional parallel program. The influence of atmospheric model parameters on the aerodynamic characteristics of the MSl entering the Martian atmosphere is analyzed. The results show that the Martian gas model and calculation method are verified by comparing with the flight data of Pirates, and the results are in good agreement with the aerodynamic characteristics of NASA's LAURA code. C0-2 effect must be taken into account in the calculation and experimental data obtained from air, the chemical nonequilibrium effect is promoted by density increase, but there is no effect on the aerodynamic characteristics of the entrant. The increase of temperature greatly enhances the chemical nonequilibrium effect, but has little effect on the aerodynamic characteristics of the inlet.
【作者单位】：中国航天空气动力技术研究院;
【分类号】：P185.3

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