临近声速气流条件下电子束空气等离子体特性

为了研究高速动态气流中的电子束等离子体特性，建立了一个由蒙特卡罗模型、多组分等离子体模型与计算流体力学模型组成的多阶段耦合数值模型，在临近声速气流条件下，对1.33104 Pa空气电子束等离子体特性进行了研究。结果表明，电子束能量沉积具有极强的空间不均性，电子束激发下的风洞流场呈现不同的性质，亚声速流场下游边界区密度减小，而在超声速流场中可诱发弱激波；相比于静止气体，在动态气流中等离子体密度下降，且存在额外的输运行为，使其向气流下游输运，但在临近声速条件下，气流速度大小对气流下游等离子体分布的影响不大；电子束入射角对等离子体空间分布和大小均有影响。

Properties of electron beam plasma in near-sound-speed air flow

In order to investigate the properties of electron beam plasma in high velocity flow, a multi-stage numerical model including the Monte Carlo model, multi-fluid plasma model and CFD model is established. In the near-sound-speed flow, the characteristics of electron beam air plasma are studied in detail. The results indicate that the energy deposition of the electron beam is nonuniform in space and the flow fields are distinct in subsonic and supersonic flow. In the subsonic flow, the density of boundary layer in the downstream decreases; but in the supersonic flow, a weak shockwave is induced by the injected beam. The plasma density decreases and the significant plasma transportation is observed in the high velocity flow, thus the plasma is transported to the downstream. The effect of the velocity magnitude on the plasma distribution is small in the near-sound-speed flow. However, the injection angle of beam influences the plasma density and distribution significantly.