中文摘要：

应用网格质点法，对离子发动机栅极系统进行了三维数值模拟．模拟得到了离子发动机栅极系统中的电场分布、离子运动轨迹、离子在计算域内的空间分布和相空间分布等．计算结果表明，屏栅的离子透明度为69．3％，大于其物理透明度67．1％，加速栅的离子透明度为100％，远大于其物理透明度31．1％，说明所选模拟工况参数合理．模拟结果可以为离子发动机栅极的初步设计提供理论参考．

英文摘要：

A three-dimensional numerical simulation was carried out with the particle-in-cell method.The electric field,the paths of the ions,the spatial and the phase spatial distribution of the ions in the calculation domain were obtained from the simulation.It shows that the ion transparency of the screen grid and the acceleration grid is 69.3% and 100%,respectively,which is respectively bigger than the physical transparencies of 67.1% and 31.1% of the screen grid and the acceleration grid.The simulation parameters selected in the calculation are reasonable.The simulation results can provide a reference for the preliminary design of the ion thruster optics.