关键词: 霍尔推力器+;内部过程;等离子体;流动分布;数值分析

Abstract: A simplified one-dimensional multi-fluid model was set up and corresponding calculation method was carried out analyze the accelerating channel of hall effect thruster (a.c. Stationary Plasma Thruster, ab. SPT). The model is based on the hypothesis of quasi-neutral and slipping-fluid between different kinds of particles. It was indicated from a concrete sample that, a steady convergent solution, which is close to reality qualitatively as well as quantitatively, could be obtained successfully under proper boundary conditions and adequacy model constants. Some phenomena are revealed from the results: (a). Drop of electric potential is concentrated around the exit, which coincide with the acceleration of ions; (b) Ionization rates are more intensive in the upstream half of the channel, relaxing down-steam near exit, with final ionization level approach to 80%; (c). During the course of electron-drifting from exit plane to anode plane, electron temperature first rises from about 10eV at the exit plane up to about 60eV at the plane of one-third channel length from exit, thanks to Joel heating, and then drops to about 25eV at anode surface because more and more electron energies are consumed by ionization processes. Hampered by its hypothesis, the model cannot reflect some special zone and other important processes; the conditions of convergence are also confined.

Key words: Hall effect thruster~+;Inner process;Plasma;Flow distribution;Numerical analysis