P70霍尔推力器新型缓冲腔磁路对预电离及放电的影响  

Effects of a new buffer magnetic circuit on preionization and discharge in a P70 Hall thruster

作　　者：韩轲[1,2] 魏立秋[1] 纪延超[1] 于达仁[1] 

机构地区：[1]哈尔滨工业大学电气工程及自动化学院,黑龙江哈尔滨150001 [2]哈尔滨商业大学计算机与信息工程学院,黑龙江哈尔滨150028

出　　处：《推进技术》2011年第6期823-827,共5页Journal of Propulsion Technology

基　　金：国家自然科学基金(51007014;50877018);黑龙江省教育厅科学技术研究项目(12511138)

摘　　要：为有效利用从P70霍尔推力器放电通道进入缓冲腔的快电子能量,考虑两个磁场特征以提高缓冲腔预电离率。一是提高磁感应强度,二是缓冲腔内从气体分配器到放电通道方向的负梯度。采用FEMM有限元磁场计算软件,在不改变推力器电离和加速通道内优化磁场特征的前提下,设计的新型缓冲腔磁路满足上述磁场特征。放电实验结果表明,在新型缓冲腔磁路下放电电流低频振荡幅值更小。新型磁路有助于延长推力器寿命,有助于电离和加速通道内电离与加速区的分离。To recycle fast electron energy from discharge channel into buffer chamber in a P70 Hall thruster,the characteristics of magnetic field were considered to improve the preionization ratio in the buffer chamber.The first characteristic is the higher magnetic flux density.The second characteristic is the negative gradient from gas distributor to discharge channel.The new magnetic circuit is designed by FEMM magnetic field calculation software.The magnetic field of new magnetic circuit satisfied the above characteristics on the premise of not changing the optimized magnetic field in the ionization and acceleration channel.Experimental results indicate that the amplitude of discharge current low frequency oscillation is smaller.The new magnetic circuit is helpful for prolonging the thruster lifetime and improving separation of ionization zone as well as the acceleration zone in discharge channel.

关 键 词：霍尔推力器 磁路 缓冲腔 预电离 

分 类 号：V439[航空宇航科学与技术—航空宇航推进理论与工程]