A global model for evaluating discharge characteristics and performance of hollow cathodes

Feng TIAN ¹Long MIAO ²Qimeng XIA ¹Zhiwen WU ¹Ningfei WANG ¹Xiao HOU¹

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作者信息

1. School of Aerospace Engineering,Beijing Institute of Technology,Beijing 100081,China
2. School of Aerospace Engineering,Beijing Institute of Technology,Beijing 100081,China;Chongqing Innovation Center,Beijing Institute of Technology,Chongqing 404100,China
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Abstract

Hollow cathode,with the highest plasma density,current density,and temperature,becomes one of the most important components in the electro-thruster system.As the electric-propulsion thruster performance is directly related to the ionization rate,reliability,and lifetime of the hollow cathode,this paper develops a global model to study the effects of discharge current,gas flow rate,and gas species on the discharge characteristics in the insert and orifice regions of the hollow cathode.The emitter wall temperatures of hollow cathodes predicted by the global model are compared with experimental results from NSTAR thruster neutralization cathodes,confirming the model's validity.The influence of hollow cathode emitter material and structure sizes on the plasma parameters in the internal regions was also evaluated.The simulation results show that there is an optimal matching relationship between the discharge current and gas flow rate to guarantee the maximum ionization rate.The optimal working region for the hollow cathode has been deter-mined under different energetic,regime and structural parameters.The global model established in this paper can quickly determine the key structure and operating parameters of hollow cathode at the design stage,and provide the theoretical basis for hollow cathode design and development.

Key words

Hollow cathode/Global model/Electric propulsion/Discharge characteristics/Optimal matching relationship

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基金项目

National Natural Science Foundation of China(U22B20120)

National Natural Science Foundation of China(NSFC52202460)

National Natural Science Foundation of China(NSFC52177128)

National Key R&D Program of China(2020YFC2201100)

National Key R&D Program of China(2021YFC2202804)

National Key R&D Program of China(2022YFB3403504)

China Postdoctoral Science Foundation(2021M690392)

China Postdoctoral Science Foundation(2021TQ0036)

Advanced Space Propulsion Laboratory of BICE()

Beijing Engineering Research Center of Efficient and Green Aerospace Propulsion Technology,China(LabASP-2021-04)

出版年

2024

中国航空学报(英文版)

中国航空学会

中国航空学报(英文版)

CSTPCDCSCDEI

影响因子：0.847

ISSN：1000-9361

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