微放电等离子体多负辉区结构融合过程数值模拟研究 |
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引用本文: | 杨龙,王强,阚明先,段书超,王刚华.微放电等离子体多负辉区结构融合过程数值模拟研究[J].强激光与粒子束,2017,29(8):085002. |
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作者姓名: | 杨龙 王强 阚明先 段书超 王刚华 |
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作者单位: | 1.中国工程物理研究院 流体物理研究所, 四川 绵阳 621 999 |
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摘 要: | 高气压下的微型电热推进器(MPT)中的放电等离子体存在多负辉区结构,其负辉区有融合趋势。对矩形微放电等离子体推进器(RMPT)的负辉区融合过程进行了二维模拟分析,在方法上采用了非平衡态的自洽流体模型,并考虑了离子电流加热和三体碰撞过程。结果显示:矩形微放电等离子体推进器(RMPT)在低电流条件下存在两个稳定的负辉区,当超过某一电流阈值条件后,两个负辉区会在腔体中心重合。分析了这一过程的成因,认为其融合过程本质上是空心阴极的导通过程,其融合与否与鞘层电压有关。
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关 键 词: | 微放电 等离子体 推进 |
收稿时间: | 2017-02-02 |
Numerical simulation of multiple negative glow regions in micro discharge plasma |
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Institution: | 1.Institute of Fluid Physics,CAEP,P.O.Box 919-105,Mianyang 621999,China |
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Abstract: | The discharge plasma in the rectangular micro hollow cathode (RMHCD) under high pressure has a multiple negative glow region structure, and the negative glow regions have a tendency of fusion, which can significantly increase the ionization efficiency. The gas is confined in the cavity, which can be effectively heated, and thus can be applied to micro-electric plasma thruster (MPT). In this paper, the 2D x-y cross-section of a rectangular micro-discharge plasma thruster (RMPT) is simulated and analyzed, and a self-consistent fluid model with non-equilibrium state is adopted in the method. The ion current heating and the three-body collision are also considered. The results show that the RMPT has two stable negative glow regions under low current conditions. When a certain current threshold is exceeded, the two negative glow regions will merge at the center of the cavity. Corresponding analysis suggests that the fusion process is essentially a hollow cathode conduction process, whether or not the fusion of negative glow regions occurs is related to sheath voltage. |
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