Effects of the critical breakdown path on the ignition performance in heaterless hollow cathodes

作     者：Bo YU Yanda LEE Xiaolu KANG Qing ZHAO 于博;李彦达;康小录;赵青

作者机构：Center for Information GeoscienceSchool of Resources and EnvironmentUniversity of Electronic Science and Technology of ChinaChengdu 611731People's Republic of China Shanghai Institute of Space PropulsionShanghai 201112People's Republic of China 

出 版 物：《Plasma Science and Technology》 (等离子体科学和技术（英文版）)

年 卷 期：2020年第22卷第6期

页      面：164-179页

核心收录：

学科分类：080703[工学-动力机械及工程] 08[工学] 082502[工学-航空宇航推进理论与工程] 0807[工学-动力工程及工程热物理] 0805[工学-材料科学与工程（可授工学、理学学位）] 0825[工学-航空宇航科学与技术] 0702[理学-物理学] 

主　　题：breakdown path heaterless hollow cathode breakdown voltage ignition time numerical calculation 

摘      要：The critical breakdown path(CBP)has a significant impact on the breakdown voltage curve and the ignition time of heaterless hollow cathodes(HHCs).To determine the pattern of the variation in the CBP position and its impact on ignition performance,a numerical model named the CBP evaluation(CBPE)was established in this paper to calculate the CBP of a *** CBPE model can be used to screen various potential breakdown paths to identify those that are most likely to satisfy the Townsend breakdown conditions,which are denoted as *** verify the calculation accuracy of the CBPE model,4.5 A-level HHC ignition tests were conducted on HHCs with three different *** comparing the test results and the calculated results of the breakdown voltage,the calculation errors of the CBPE under three HHC conditions ranged from 1.6%to 5.8%,and the trends of the calculated results were consistent with those of the test *** ignition test also showed the characteristics of the breakdown voltage curve and the ignition time for the three *** on the CBPE model,an in-depth analysis was conducted on the mechanism of the patterns revealed by the *** main conclusions are presented as follows:(1)the CBP always shifts from the long path to the short path in the HHCs with an increasing gas flow rate;and(2)the ignition time of the HHCs depends on the position of the CBP because different CBP positions can cause different mechanisms of heat transfer from the plasma to the *** study can guide the optimization of the CBP position and the corresponding ignition times of HHCs.