Study on the Relation Between Discharge Voltage and Magnetic Field Topography in a Hall Thruster Discharge Channel

2009 ◽  
Vol 49 (6) ◽  
pp. 413-421 ◽  
Author(s):  
D. R. Yu ◽  
J. Li ◽  
H. Liu ◽  
Z. X. Ning ◽  
Y. Li
Keyword(s):  
Magnetic Field ◽  
Discharge Channel ◽  
Discharge Voltage ◽  
Hall Thruster

Influence of the Magnetic Field Topology on Hall Thruster Discharge Channel Wall Erosion

2012 ◽  
Vol 22 (3) ◽  
pp. 4904105-4904105 ◽  
Author(s):  
Chang Liu ◽  
Zuo Gu ◽  
Kan Xie ◽  
Yunkui Sun ◽  
Haibin Tang
Keyword(s):  
Magnetic Field ◽  
Channel Wall ◽  
Discharge Channel ◽  
Hall Thruster ◽  
Magnetic Field Topology ◽  
The Magnetic Field

scholarly journals Performance Simulation of a 5 kW hall Thruster

2021 ◽  
Vol 8 ◽  
Author(s):  
L. Yang ◽  
P. Y. Wang ◽  
T. Wang
Keyword(s):  
Magnetic Field ◽  
Mass Flow Rate ◽  
Mass Flow ◽  
Flow Rate ◽  
Oscillation Amplitude ◽  
Discharge Voltage ◽  
Hall Thruster ◽  
Total Efficiency ◽  
Discharge Process ◽  
Steady State Oscillation

Hall thruster is a kind of plasma optics device, which is used mainly in space propulsion. To simulate the discharge process of plasma and the performance of a 5 kW hall thruster, a two-dimensional PIC-MCC model in the R-Z plane is built. In the model, the anomalous diffusion of the electrons including Bohm diffusion and near-wall conduction is modeled. The Bohm diffusion is modeled by using a Brownian motion instead of the Bohm collision method and the near-wall conduction is modeled by a secondary electron emission model. In addition to the elastic, excitation, and ionization collisions between electrons and neutral atoms, the Coulomb collisions are included. The plasma discharge process including the transient oscillation and steady state oscillation is well reproduced. First, the influence of the discharge voltage and magnetic field on the steady state oscillation is simulated. The oscillation amplitude increases as the discharge voltage gets larger at first, and then decreases. While the oscillation amplitude decreases as the magnetic field gets stronger at first, and then increases. Later, the influence of the discharge voltage and mass flow rate on the performance of the thruster is simulated. When the mass flow rate is constant, the total efficiency initially increases with the discharge voltage, reaches the maximum at 600 V, and then declined. When the discharge voltage is constant, the total efficiency increases as the mass flow rate rises from 10 to 15 mg/s. Finally, a comparison between simulated and experimental performance reveals that the largest deviation is within 15%, thereby indirectly validating the accuracy of the model.

Investigation of short-channel design on performance optimization effect of Hall thruster with large height-radius ratio

2021 ◽  
Author(s):  
Haotian Fan ◽  
Yongjie Ding ◽  
Chunjin Mo ◽  
Liqiu Wei ◽  
Hong Li ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Discharge Channel ◽  
Magnetic Field Intensity ◽  
Radius Ratio ◽  
Utilization Efficiency ◽  
Hall Thruster ◽  
Anode Surface ◽  
Short Channel ◽  
Ionization Zone ◽  
The Magnetic Field

Abstract In this study, the neutral gas distribution and steady-state discharge under different discharge channel lengths were studied via numerical simulations. The results show that the channel with a length of 22 mm has the advantage of comprehensive discharge performance. At this time, the magnetic field intensity at the anode surface is 10% of the peak magnetic field intensity. Further analysis shows that the high-gas-density zone moves outward due to the shortening of the channel length, which optimizes the matching between the gas flow field and the magnetic field, and thus increases the ionization rate. The outward movement of the main ionization zone also reduces the ion loss on the wall surface. Thus, the propellant utilization efficiency can reach a maximum of 96.8%. Moreover, the plasma potential in the main ionization zone will decrease with the shortening of the channel. The excessively short channel will greatly reduce the voltage utilization efficiency. The thrust is reduced to a minimum of 46.1 mN. Meanwhile, because the anode surface is excessively close to the main ionization zone, the discharge reliability is also difficult to guarantee. It was proved that the performance of Hall thrusters can be optimized by shortening the discharge channel appropriately, and the specific design scheme of short channel of HEP-1350PM was defined, which serves as a reference for the optimization design of Hall thruster with large height-radius ratio. The short-channel design also helps to reduce the thruster axial dimension, further consolidating the advantages of lightweight and large thrust-to-weight ratio of the Hall thruster with large height-radius ratio.

Effects of the peak magnetic field position on Hall thruster discharge characteristics

2020 ◽  
Vol 66 (8) ◽  
pp. 2024-2034
Author(s):  
Haotian Fan ◽  
Hong Li ◽  
Yongjie Ding ◽  
Liqiu Wei ◽  
Daren Yu
Keyword(s):  
Magnetic Field ◽  
Hall Thruster ◽  
Discharge Characteristics ◽  
Magnetic Field Position ◽  
Field Position

Effect of a magnetic field in simulating the plume field of an anode layer Hall thruster

2009 ◽  
Vol 105 (1) ◽  
pp. 013303 ◽  
Author(s):  
Yongjun Choi ◽  
Iain D. Boyd ◽  
Michael Keidar
Keyword(s):  
Magnetic Field ◽  
Hall Thruster ◽  
Anode Layer

Effects of the magnetic field gradient on the wall power deposition of Hall thrusters

2017 ◽  
Vol 83 (2) ◽  
Author(s):  
Yongjie Ding ◽  
Peng Li ◽  
Xu Zhang ◽  
Liqiu Wei ◽  
Hezhi Sun ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Field Gradient ◽  
Discharge Channel ◽  
Magnetic Field Gradient ◽  
Zero Magnetic Field ◽  
Power Deposition ◽  
Neutral Gas ◽  
Channel Exit ◽  
Ionization Region ◽  
The Magnetic Field

The effect of the magnetic field gradient in the discharge channel of a Hall thruster on the ionization of the neutral gas and power deposition on the wall is studied through adopting the 2D-3V particle-in-cell (PIC) and Monte Carlo collisions (MCC) model. The research shows that by gradually increasing the magnetic field gradient while keeping the maximum magnetic intensity at the channel exit and the anode position unchanged, the ionization region moves towards the channel exit and then a second ionization region appears near the anode region. Meanwhile, power deposition on the walls decreases initially and then increases. To avoid power deposition on the walls produced by electrons and ions which are ionized in the second ionization region, the anode position is moved towards the channel exit as the magnetic field gradient is increased; when the anode position remains at the zero magnetic field position, power deposition on the walls decreases, which can effectively reduce the temperature and thermal load of the discharge channel.

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