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Numerical Simulation of Weakly Ionized Dynamic Plasma for Reentry Vehicles

机译：再入飞行器弱电离动态等离子体的数值模拟

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摘要

Past studies of plasma sheaths enveloping vehicles have shown that the distribution of plasma is time-varying and results in communication and navigation problems. This paper aims to investigate the dynamic characteristics of the plasma sheath through the simulations of the Radio Attenuation Measurements-C II vehicle and the Apollo command module flowfields. The numerical methodology is based on the unsteady Reynolds-averaged Navier-Stokes model and the detached-eddy simulation model, and the thermochemical nonequilibrium effect is considered. The stable flows of both vehicles with a steady plasma sheath widely distributed in the shock-wave layer are first obtained. For the Radio Attenuation Measurements-C II vehicle, the dynamic plasma arising from the vehicle pitching oscillation has the same frequency as the vehicle oscillation, and the magnitude of the disturbance to plasma is related to the oscillation velocity. For the Apollo command module, the oscillation period of the electron density is the same as the evolution period of the vortex structures in the leeward regions. The time-varying surface electron density and pressure reveal a similar variation trend with the phase difference. In addition, the periodicity of the dynamic plasma disappears as the flow instability intensifies in the Apollo command module flowfields, whereas periodic plasma exists for a long time in the Radio Attenuation Measurements-C II vehicle oscillation flowfields.
机译：过去的包围等离子护套车辆的研究表明，等离子的分布随时间变化，并导致通信和导航问题。本文旨在通过对无线电衰减测量-C II车辆和阿波罗指令模块流场的仿真来研究等离子体鞘的动态特性。数值方法基于非稳态的雷诺平均Navier-Stokes模型和分离涡模拟模型，并考虑了热化学非平衡效应。首先获得在冲击波层中广泛分布的具有稳定的等离子体鞘的两辆车辆的稳定流量。对于无线电衰减测量-C II车辆，由车辆俯仰振荡产生的动态等离子体具有与车辆振荡相同的频率，并且对等离子体的干扰幅度与振荡速度有关。对于阿波罗指令模块，电子密度的振荡周期与下风区域中涡旋结构的演化周期相同。随时间变化的表面电子密度和压力随相差显示出相似的变化趋势。此外，在Apollo命令模块流场中，随着流动不稳定性的增强，动态等离子体的周期性消失，而在Radio Attenuation Measurements-C II车辆振荡流场中，周期性等离子体存在了很长时间。

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  • 来源
    《Journal of Spacecraft and Rockets》 |2016年第5期|900-911|共12页
  • 作者

    Shao Chun; Tian Deyang; Qian Kun; Chen Weifang;

  • 作者单位

    Zhejiang Univ, Coll Aeronaut & Astronaut, Hangzhou 310027, Zhejiang, Peoples R China;

    Zhejiang Univ, Coll Aeronaut & Astronaut, Hangzhou 310027, Zhejiang, Peoples R China;

    Zhejiang Univ, Coll Aeronaut & Astronaut, Hangzhou 310027, Zhejiang, Peoples R China;

    Zhejiang Univ, Coll Aeronaut & Astronaut, Hangzhou 310027, Zhejiang, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
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