供气周向不均匀对霍尔推力器放电特性及性能的影响

摘要

研究发现,由于气体分配器安装及制造误差,或者出气孔被溅射产生的粒子阻塞容易导致霍尔推力器周向出气不均匀.采用堵塞气体分配器出气孔的方式实现周向不均匀气体分布来研究供气周向不均匀程度对霍尔推力器放电特性及性能的影响,试验得到了不同情况下的电流特性、近场区离子电流密度分布以及整体性能参数.结果表明,出气周向不均匀导致放电电流增加,增量最大可达25%以上,放电电流振荡严重,同时减小了推力器的效率和比冲.%Researches show that the gas distributor of Hall thrusters with manufacture and installation error,or the vent holes plugged up by the sputtered particles would result in azimuthal non-uniformity of neutrals.The influences of the degree of azimuthal non-uniformity of neutrals on the discharge characteristic and performance of Hall thrusters were studied by plugging up the vent hole of gas distributor.Current characteristic,ion current density distribution and overall performance were obtained by experiments.Results show that azimuthal non-uniformity of neutrals results in higher discharge current with the maximum of increments of 25%, lower thruster efficiency,lower special impulse,and bigger oscillation.