| 基于Kr工质的离子推力器栅极PIC仿真 |
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| 引用本文： | 陈茂林,夏广庆,邹存祚,毛根旺.基于Kr工质的离子推力器栅极PIC仿真[J].强激光与粒子束,2015,27(7):074005. |
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| 作者姓名： | 陈茂林 夏广庆 邹存祚 毛根旺 |
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| 作者单位： | 1.西北工业大学 燃烧、热结构与内流场重点实验室, 西安 71 0072; |
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| 摘 要： | Kr是新型低成本离子推力器的优选工质之一。采用三维PIC粒子模拟方法对Kr等离子体在栅极系统中的输运过程进行仿真,并与Xe工质仿真结果进行对比,分析工质类型对束流分布、离子通过率、发散角损失和推力等参数特性和分布的影响。结果表明:相比于Xe工质,Kr工质条件下,屏栅上游鞘层区域更大,屏栅离子通过率略有上升;Kr+在加速栅孔轴向速度较大,径向位移小,撞击加速栅几率小,加速栅电流相对较小;Kr工质和Xe工质的发散角损失相当,但Kr工质工作电流区域更高;相比于Xe工质,相同功率条件下Kr工质的推力值约降低20%。
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| 关 键 词： | 离子推力器 栅极系统 等离子体模拟 PIC 氪 束流 |
| 收稿时间： | 2015-03-17 |
PIC simulation of ion thruster optics with Kr propellant |
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| Affiliation: | 1.Science and Technology on Combustion,Internal Flow and Thermo-Structure Laboratory,Northwestern Polytechnical University,Xi’an 710072,China;2.State Key Laboratory of Structural Analysis for Industrial Equipment,Dalian University of Technology,Dalian 116024,China |
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| Abstract: | Kr is one of the preferred propellants for the low cost ion thruster. The Kr plasma transport process was simulated with a 3D PIC method, and results were compared with those using the traditional Xe propellant. The influence of propellant type on optics performance was analyzed, such as the beam distribution, ions through rate and divergence angle loss. The results show that: the screen grid sheath of Kr plasma in discharge cavity is deeper than that of Xe plasma, and ions through rate of screen grid is higher; the axial velocity of Kr ion is bigger than that of Xe ion near the accelerator grid hole, which means the radial displacement distance is relatively small and the accelerator grid current caused by ion impact decreases; the divergence angle loss of Kr propellant is the same as that of Xe propellant, but the operation current is higher; the thrust of Kr decreases about 20% compared with that of Xe propellant for the same beam current and accelerating potential. The results of the study have important significance to optimize the propellant for ion thruster. |
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