航空学报 > 2022, Vol. 43 Issue (12): 126289-126289   doi: 10.7527/S1000-6893.2021.26289

织物透气性对火星用降落伞气动特性影响机理

徐欣1, 贾贺2,3, 陈雅倩1,4, 荣伟3, 蒋伟3, 薛晓鹏1   

  1. 1. 中南大学 航空航天学院, 长沙 410083;
    2. 南京航空航天大学 航空学院, 南京 210016;
    3. 北京空间机电研究所, 北京 100094;
    4. 浙江大学 航空航天学院, 杭州 310058
  • 收稿日期:2021-08-27 修回日期:2021-09-22 发布日期:2021-11-23
  • 通讯作者: 薛晓鹏,E-mail:xuexiaopeng@csu.edu.cn E-mail:xuexiaopeng@csu.edu.cn
  • 基金资助:
    国家自然科学基金(12072377,11702332,11972192);湖南省自然科学基金(2022JJ30678);航天进入减速与着陆技术实验室开放基金(EDL19092126);湖南省研究生科研创新项目(CX20200258);中南大学研究生自主探索创新项目(2020zzts758)

Influence mechanism of fabric permeability of canopy on aerodynamic performance of Mars parachute

XU Xin1, JIA He2,3, CHEN Yaqian1,4, RONG Wei3, JIANG Wei3, XUE Xiaopeng1   

  1. 1. School of Aeronautics and Astronautics, Central South University, Changsha 410083, China;
    2. College of Aerospace Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China;
    3. Beijing Institute of Space Mechanics and Electricity, Beijing 100094, China;
    4. School of Aeronautics and Astronautics, Zhejiang University, Hangzhou 310058, China
  • Received:2021-08-27 Revised:2021-09-22 Published:2021-11-23
  • Supported by:
    National Natural Science Foundation of China (12072377, 11702332, 11972192); Natural Science Foundation of Hunan Province (2022 JJ30678); Foundation of Laboratory of Aerospace Entry, Descent and Landing Technology (EDL19092126); Graduate Research Innovation Project of Hunan Province (CX20200258); Graduate Independent Exploration and Innovation Project of Central South University (2020zzts758)

摘要: 探测器的进入、减速、着陆过程是火星探测任务中的关键一环,火星降落伞在其中起着至关重要的减速作用。然而,作为火星任务中唯一成功使用至今的伞型,盘-缝-带伞型已经达到了其尺寸极限,而新一代的超声速盘帆伞和环帆伞亦在飞行试验中全部失败,这可能与其复杂的透气特性(几何透气性和织物透气性)相关。但目前针对织物透气性的研究主要集中在亚声速范围,超声速条件下织物透气性的影响机理尚不明了且报道极少。以火星科学实验室降落伞为基础模型,从伞衣厚度和相对透气量等关键设计参数角度,对其开展织物透气性影响机理的数值研究。结果表明:针对透气性伞衣,织物透气性的改变对降落伞的阻力性能影响较小,但对降落伞的稳定性影响较大;对于1 mm伞衣厚度,16%~24%的相对透气量稳定性较优;对于12%相对透气量的伞衣,0.2~0.5 mm的伞衣厚度稳定性最佳;相对亚声速来流,超声速来流下的透气性降落伞的稳定性更高。以上研究结论能够为新一代降落伞织物透气性的设计提供一定的理论参考。

关键词: 织物透气性, 盘-缝-带降落伞, 气动特性, 火星探测, 非定常流动

Abstract: The process of entry, descent and landing of the capsule is a key stage of the Mars exploration mission, during which the Mars parachute plays a crucial role in the capsule deceleration from supersonic to subsonic speed. However, the parachute successfully used to date in all Mars missions, i.e., the disk-gap-band parachute, has reached its size limit, whereas the new generation of the supersonic disk-sail and ring-sail parachute has failed in their flight tests, which may be related to their complicated porosities (i.e., geometric porosity and fabric permeability). The research on the fabric permeability is mostly considered for cases in the subsonic flows, and the influence mechanism of fabric permeability under supersonic conditions is not clear and rarely reported. Based on the Mars Science Laboratory parachute model, we perform numerical simulations to study the influence mechanism of fabric permeability on the aerodynamic performance of the Mars parachute from the key parameters, i.e., the thickness of the canopy and a specific porosity (computed from its fabric permeability at a standard pressure differential). Results show that the change of the specific porosity (fabric permeability) has a minor effect on the drag performance of the parachute, while exerting a major effect on the parachute stability. When the thickness is 1 mm, the canopy with a specific porosity of 16%-24% exhibits better stability, and the best stability is achieved when the canopy has a specific porosity of 12% with a thickness of 0.2-0.5 mm. Furthermore, the porous parachute placed in the supersonic flows is more stable than that in the subsonic flows. These results can provide theoretical reference for the design of the fabric permeability of new generation parachutes.

Key words: fabric permeability, disk-gap-band parachute, aerodynamic performance, Mars exploration, unsteady flows

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