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| 霍尔推力器等离子体磁鞘特性 |
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段萍1,2, 沈鸿娟1, 刘金远3, 李肸2, 鄂鹏4, 陈龙3
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1.大连海事大学 物理系,辽宁 大连 116026;2.大连大学 物理科学与技术学院,辽宁 大连 116622;3.大连理工大学 物理与光电工程学院,辽宁 大连 116024;4.哈尔滨工业大学 电气工程系, 黑龙江 哈尔滨 150001
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| 摘要: |
| 为进一步研究霍尔推力器壁面二次电子发射对发动机性能的影响,建立流体模型数值模拟了霍尔推力器磁化二次电子等离子体的鞘层特性,采用Sagdeev势的方法得到了鞘层的玻姆判据,以这个判据为鞘层边界条件数值讨论了磁场、二次电子发射以及不同等离子体对推力器等离子体鞘层结构的影响。结果表明, 磁场和二次电子发射系数的增加都将使鞘层中粒子密度增加,鞘层电势升高,鞘层厚度减小；对于氩和氙二种等离子体,氙等离子体产生的鞘层势垒高,粒子密度大,鞘层厚度增加。这些结果直接影响推力器的电子传导机制及性能。 |
| 关键词: 霍尔推力器 磁鞘 二次电子 |
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| 基金项目:国家自然科学基金(10975026；10875024；11005025)；辽宁省高等学校科研项目(2008S059)。 |
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| Characteristics of magnetized sheath in Hall thruster |
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DUAN Ping1,2, SHEN Hong-juan1, LIU Jin-yuan3, LI Xi2, E Peng4, CHEN Long3
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1.College of Physics, Dalian Maritime University, Dalian 116026, China;2.College of Physics Science and Technology, Dalian University, Dalian 116622, China;3.School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian 116024, China;4.Department of Electrical Engineering, Harbin Institute of Technology, Harbin 150001, China
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| Abstract: |
| To investigate the effects of secondary electron emission on the performance of engine, a liquid model has been used to study the characteristics of the magnetized plasma sheath. And the Bohm criterion of the plasma sheath was given out by using the Sagdeev potential method. Then the effects of magnetic field, secondary electron emission and plasma species on the structure of plasma sheath in Hall thruster were discussed by using the Bohm criterion as the boundary conditions. The simulation results indicate that both particle density and sheath potential increase with the augment of secondary electron emission coefficient and the azimuth angle of magnetic field which changes the sheath thickness. Meanwhile, both sheath thickness and wall potential vary in different plasma species. These effects will influence the wall material and the performance of thruster directly. |
| Key words: Hall thruster Magnetized sheath Secondary electron |
