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NUMERICAL CALCULATION CODE FOR DESIGN OF CUSPED ION THRUSTERS

尖端离子推进器设计数值计算代码

基本信息

批准号：
03555013
负责人：
ARAKAWA Yoshihiro
金额：
$ 4.22万
依托单位：
UNIVERSITY OF TOKYO
依托单位国家：
日本
项目类别：
Grant-in-Aid for Developmental Scientific Research (B)
财政年份：
1991
资助国家：
日本
起止时间：
1991 至 1992
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-03555013/
关键词：
ELECTRIC PROPULSION CUSPED MAGNETIC FIELD ION THRUSTER NUMERICAL CODE PLASMA ION BEAM 計算コ-ドイオンビ-ム

项目摘要

A numerical calculation code for cusped ion thrusters was developed to estimate thruster performance and to optimize chamber design. This code can be used to calculate both ion production cost and propellant utilization efficiency for a cylindrical ion thruster having any magnetic field configuration. This code is composed of four calculation sections; namely ones that are used 1) to compute the direction and strength of magnetic fields applied to the discharge chamber. 2) to compute grid transparencies to ions and neutral atoms. 3) to compute primary electron confinement time, and 4) to compute the fraction of ions produced that are extracted as an ion beam. In the first section, a two-dimensional magnetic analysis code using the Finite Element Method was employed to compute the magnetic field configuration. In the second, a tow-dimensional ion optics code is uded to compute ion trajectries and to optimize the grid system design. In the third section, a charge particle kinetic model using the Monte Carlo Method was employed to compute orbits of primary electrons in the discharge chamber and then to compute the confinement time. In the last calculation section, a plasma flow model based on plasma diffusion equation is used to compute the extracted-ion fraction. Combing these with the discharge chamber model base on the conservation equations of mass, charge, and energy, one can compute plasma properties and then calculate the thruster performance. Several numerical results were shown and compared with experimental results obtained in several ion thrusters. From the results, it is concluded that this code is a useful tool of optimizing the chamber geometry and the magnetic field configuration for good thruster performance.

开发了一个用于估算会切离子推力器性能和优化燃烧室设计的数值计算程序。该程序可用于计算具有任意磁场结构的圆柱形离子推力器的离子产生成本和推进剂利用效率。该代码由四个计算部分组成;即用于1）计算施加到放电室的磁场的方向和强度的部分。2)来计算离子和中性原子的网格平行度。3)计算初级电子约束时间，以及4）计算作为离子束提取的所产生的离子的分数。在第一部分中，使用有限元法的二维磁性分析代码来计算磁场位形。在第二部分中，我们使用了一个二维离子光学程序来计算离子的几何形状和优化网格系统的设计。在第三部分中，利用蒙特卡罗方法建立了一个带电粒子动力学模型，计算了放电室中初级电子的轨道，进而计算了约束时间。在最后的计算部分中，基于等离子体扩散方程的等离子体流模型被用来计算提取的离子分数。结合基于质量、电荷和能量守恒方程的放电室模型，可以计算等离子体特性，进而计算推力器性能。几个数值计算结果显示，并与实验结果在几个离子推力器。结果表明，该程序可用于优化推力室几何形状和磁场结构，以获得良好的推力器性能。