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为进一步探索霍尔推力器通道内等离子体鞘层的物理机制,针对霍尔推力器等离子体鞘层区域建立二维物理模型,采用二维粒子模拟方法研究了二次电子发射系数、鞘层电子数密度、鞘层电势以及电场随离子入射速度的变化规律,分析了模拟区域径向尺度大小对鞘层稳定性的影响。结果表明:壁面二次电子发射系数随离子入射速度的增大有少许增大,变化在10-3数量级;随着离子入射速度的增大,电子数密度、鞘层电势降及径向电场都减小,而轴向电场几乎不变;在相同的边界条件下,模拟区域径向尺度的增大会导致壁面电势随时间的振荡加剧,鞘层稳定性降低。
In order to further explore the physical mechanism of the plasma sheath in the Hall thruster channel, a two-dimensional physical model of the Hall thruster plasma sheath region was established. The two-dimensional particle simulation method was used to study the secondary electron emission coefficient, Number density, sheath potential and electric field with the ion incident speed, the influence of the radial size on the stability of the sheath was analyzed. The results show that the wall electron emission coefficient increases slightly with the increase of ion incident velocity, which varies by 10-3 orders of magnitude. With the increase of ion incident velocity, electron density, sheath potential drop and radial electric field While the axial electric field almost does not change. Under the same boundary conditions, the increase of the radial dimension of the simulated area will lead to the oscillation of the wall potential with time increasing and the stability of the sheath decreasing.