自身场磁等离子体推力器数值仿真流场特性分析

磁等离子体推力器以其推力大、比冲高等特点，成为未来深空探测、星际航行任务首选的电推力器类型，研究推力器内部等离子体流场特性，有利于解释推力器出现的物理现象。针对特定自身场磁等离子体推力器，建立磁流体模型，使用TVD Lax-Friedrich格式以及ADI方法对推力器内部及羽流进行数值求解，得到等离子体流场及等离子体参数分布情况，仿真结果显示在高电流工况下，等离子体羽流更加集中，轴向加速效果更加显著，但高电流模式下阴极温度较高，不利于阴极的使用寿命。

Analysis of Flowfield Characteristics in Numerical Simulation of Self-Field Magnetoplasmadynamic Thruster

Magnetoplasmadynamic Thrusters have the characteristics of large thrust and high specific impulse, making it the preferred type of electric thruster for future deep space exploration and interstellar navigation missions. Studying the characteristics of the plasma flowfield inside the thruster is helpful to explain the physical phenomena of the thruster. For the specific self-field magnetic plasma thruster, a magnetohydrodynamics model is established, and the internal and plume of the thruster are numerically solved by using the TVD Lax-Friedrich scheme and the ADI method, and the plasma flowfield and plasma parameter distribution are obtained. The simulation results demonstrate that plasma plume is more concentrated and the effect of axial acceleration is more significant in high current mode. However, the cathode temperature is higher in this condition, which is not conducive to the service life of the cathode.