立方星阻力帆气动特性的DSMC模拟  

DSMC Simulations of Cubesat Drag Sail Aerodynamics

作　　者：李锦[1] 江定武[1] 黎昊旻 万钊[1] 王新光[1] 毛枚良[1] 陈坚强[1] LI Jin;JIANG Ding-wu;LI Hao-min;WAN Zhao;WANG Xin-guang;MAO Mei-liang;CHEN Jian-qiang(Computational Aerodynamics Institute,China Aerodynamics Research and Development Center,Mianyang 621000,China)

机构地区：[1]中国空气动力研究与发展中心计算空气动力研究所,绵阳621000

出　　处：《空间碎片研究》2023年第3期46-53,共8页Space Debris Research

摘　　要：立方星的大量发射将加剧近地轨道的空间碎片问题。阻力帆技术利用气动阻力,可使得卫星被动离轨并进入大气层烧毁。离轨周期的计算需要对稀薄气动特性做出精确预测。本文采用NNW-DSMC软件,对立方星阻力帆离轨装置在不同高度下的稀薄绕流流场进行数值模拟,分析了气动特性的变化规律。结果表明,NNW-DSMC的计算结果与文献结果吻合良好(阻力系数与参考结果的相对误差小于1%,最大热流的相对误差在6%以内),进一步验证了其计算精度和可靠性。将碰撞松弛数设置为温度的函数后,转动和振动温度降低,平动温度升高,流场总温度也增加了约10%。为增加模拟的保真度,应将松弛碰撞数设置为温度的函数。本文结果可为后续的立方星离轨动力学分析提供支撑。The mass launch of Cubesat will exacerbate the problem of space debris in low Earth orbit.Drag sail technology uses aerodynamic drag to make satellites passively deorbit and burn up in the atmosphere.The calculation of deorbit period requires accurate prediction of rarefied aerodynamic characteristics.In this paper,by using NNW-DSMC software,the rarefied flow field around Cubesat drag sail at different altitudes is numerically simulated,and the variation of aerodynamic characteristics is analyzed.The results show that the calculated results of NNW-DSMC are in good agreement with those of literatures(the error between the drag coefficient and the reference result is less than 1%and the error of the maximum heat flux is within 6%).The accuracy and reliability are further verified.When the collision relaxation number is set as a function of temperature,the rotational and vibrational temperatures decrease,the translational temperature increases,and the total temperature of the flow field increases by about 10%.To increase the fidelity of the simulation,the collision relaxation number should be considered as a function of temperature.The results can provide support for the subsequent analysis of Cubesat deorbiting dynamics.

关 键 词：DSMC 立方星 阻力帆 离轨 稀薄气动特性 

分 类 号：V211.3[航空宇航科学与技术—航空宇航推进理论与工程]