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采用N-S方程求解了100 W微波等离子体推力器(MPT)选用不同推进工质时的性能参数;并采用直接蒙特卡洛模拟方法(DSMC)对MPT羽流进行了数值模拟。结果表明,几种工质的推力变化不大,氦气为23.6 mN,氮气为24.8mN,氩气为24.8 mN;但比冲区别较大,氦气为565.2 s,氮气为243.7 s,氩气为180.2 s。羽流场中,密度、压强及温度沿轴向和径向均逐渐减小;轴向速度在轴线附近变化不大,采用氩气工质时,约1 700 m/s,在远离轴线区域,沿流动方向逐渐增大,沿径向逐渐减小;径向速度沿轴向变化不大,沿径向逐渐增大,并在接近流动区域边界时迅速减小。
The N-S equation was used to solve the performance parameters of 100 W microwave plasma thruster (MPT) with different propellants. The MPT plume was numerically simulated by direct Monte Carlo simulation (DSMC). The results show that the thrust of several working fluids does not change much, the helium is 23.6 mN, the nitrogen is 24.8 mN and the argon is 24.8 mN. However, the specific impulse is quite different. The helium is 565.2 s, the nitrogen is 243.7 s, 180.2 s. In the plume flow field, the density, pressure and temperature decrease along the axial direction and the radial direction. The axial velocity changes little around the axis. When argon working fluid is used, about 1 700 m / s, Gradually increases in the direction of flow and decreases in the radial direction. The radial velocity changes little in the axial direction, increases in the radial direction, and decreases rapidly when approaching the boundary of the flow area.