不同功率下无工质微波推力器的推力预估

基于经典电动力学理论,从麦克斯韦方程组和麦克斯韦张量出发,推导出无工质微波推力器的推力计算方程. 应用有限元分析软件,计算了特定谐振模式下的特定圆台谐振腔在不同功率条件下的电磁场分布;根据推导出的理论计算公式,计算了不同功率条件下推力器的总推力. 计算结果表明:推力与功率成正比,而且磁场力决定着总推力的大小;圆台谐振腔消耗20–200 W电磁波功率时所产生的推力在20–250 mN范围内.关键词：电磁波麦克斯韦张量

Thrust prediction of propellantless microwave thruster operating on variational power

Based on classical electrodynamics theory, the theoretical prediction equations for calculating the thrust of propellanless microwave thruster is deduced according to Maxwell equation and tress tensor. With the calculated electromagnetic fields by using finite element analysis software, the electromagnetic field distribution of a defined thruster cavity operating in a specific resonant mode under different electromagnetic powers is calculated to predict its thrust according to the deduced method. It is found that the thrust increases with the increase of the electromagnetic power and the total thrust is determined by the magnetic thrust. The net thrust will rang from 20 to 250 mN in a power range from 20 to 200 W.