CAJ | 학술논문

无热子空心阴极内部中性气体压力分布，特别是阴极顶与触持极间的压力分布，对其点火启动电压有较大影响。利用有限元法（FEA）结合可压缩流绝热流动模型，对无热子空心阴极点火前的稳定状态下，中性流场分布进行了数值模拟。模拟结果显示阴极顶小孔、触持极孔和阴极顶触持极间距三个结构参量中，触持极孔对阴极顶触持极的极间中性气体压力分布影响最为明显，阴极顶小孔和极间距对中性气体压力分布几乎无影响，但根据帕邢定律，极间距的改变对气体击穿电压（阴极点火电压）影响较大。模拟结果说明在工质气体流率一定时，影响无热子空心阴极极间气体击穿电压主要因素是触持极孔径和阴极顶与触持极间距。
무열자공심음겁내부중성기체압력분포，특별시음겁정여촉지겁간적압력분포，대기점화계동전압유교대영향。이용유한원법（FEA）결합가압축류절열류동모형，대무열자공심음겁점화전적은정상태하，중성류장분포진행료수치모의。모의결과현시음겁정소공、촉지겁공화음겁정촉지겁간거삼개결구삼량중，촉지겁공대음겁정촉지겁적겁간중성기체압력분포영향최위명현，음겁정소공화겁간거대중성기체압력분포궤호무영향，단근거파형정률，겁간거적개변대기체격천전압（음겁점화전압）영향교대。모의결과설명재공질기체류솔일정시，영향무열자공심음겁겁간기체격천전압주요인소시촉지겁공경화음겁정여촉지겁간거。
The distribution of neutral propellant gas pressure in the heaterless cathode,especially the region which along the cathode tip to keeper,is important to the ignition voltage value. In this paper,the pressure and velocity distribu-tion before the ignition of heaterless cathode were simulated by the FEA method and high Mach number compressible flu-id model. The result is indicated that the neutral gas pressure along the cathode tip and keeper was related sensitively to the keeper orifice diameter and it was effect weakly by the cathode tip orifice diameter and the spacing along the tip and keeper. But the ignition voltage of heaterless cathode will be affected by the spacing along the electrode according to the Paschen's law. The result of this paper demonstrates that key factors of influences the breakdown voltage of heaterless cath-ode are keeper orifice diameter and spacing along the tip and keeper when the propellant is not changed. That would be given some references when developing the simulation model of hollow cathode or the design of a new heaterless cathode.