方明, 李丹杨, 徐昆. 类探月返回试验器稀薄气体电离特性分析[J]. 空气动力学学报, 2019, 37(6): 924-930. DOI: 10.7638/kqdlxxb-2017.0206
引用本文: 方明, 李丹杨, 徐昆. 类探月返回试验器稀薄气体电离特性分析[J]. 空气动力学学报, 2019, 37(6): 924-930. DOI: 10.7638/kqdlxxb-2017.0206
FANG Ming, LI Danyang, XU Kun. Rarefied ionization analysis for lunar exploration type capsule[J]. ACTA AERODYNAMICA SINICA, 2019, 37(6): 924-930. DOI: 10.7638/kqdlxxb-2017.0206
Citation: FANG Ming, LI Danyang, XU Kun. Rarefied ionization analysis for lunar exploration type capsule[J]. ACTA AERODYNAMICA SINICA, 2019, 37(6): 924-930. DOI: 10.7638/kqdlxxb-2017.0206

类探月返回试验器稀薄气体电离特性分析

Rarefied ionization analysis for lunar exploration type capsule

  • 摘要: 探月返回试验器以接近第二宇宙速度再入,绕流气体将发生较为严重的化学反应和电离,传统上发生在连续流区的通信黑障大幅向稀薄区域延伸。本文基于自主开发的稀有组分权重因子方法的DSMC计算平台,采用公开的外形和与探月返回试验器相似的飞行条件,针对第一次再入、第一次跳出和第二次再入的稀薄流域,重点考察类探月返回试验器的稀薄气体电离特性。通过电子数密度预测通信中断发生高度,其结果与飞行试验观测值具有良好的一致性,误差在2 km以内。计算结果还表明,与RAM-C Ⅱ等细长体的联合电离不同,对于类探月返回试验器的大钝头体再入,主要电离来源是N、O与中性分子或原子碰撞导致的直接电离。

     

    Abstract: As the lunar exploration capsule reentries with the second cosmic speed, serious chemical reactions and ionization occur in the surrounding atmosphere, and the communication blackout traditionally happened in continuum flows extends widely to the rarefied regime. Based on our own developed DSMC computation platform based on weighting factor scheme for trace species, the rarefied air ionization of lunar exploration type capsule is investigated, including the first reentry, first jump-out as well as second reentry processes in rarefied flow regimes, with an open configuration and simulation flying conditions. The communication blackout starting altitudes are predicted due to the electron number density, and the results behave excellent agreement with the flight observations, with errors smaller than 2 km. The results also reveal that, different from the associative ionization for slender body such as RAM-C Ⅱ, the main ionization source of the reentry for large blunt body like the lunar exploration type capsule is the direct ionization due to the collision between N, O and neutral molecules or atoms.

     

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