Measurement method for plume divergence angle of Hall thrusters

2019 ◽  
Vol 37 (1) ◽  
pp. 012902
Author(s):  
Yongjie Ding ◽  
Hongbo Su ◽  
Hong Li ◽  
Boyang Jia ◽  
Liqiu Wei ◽  
...  
Keyword(s):  
Measurement Method ◽  
Divergence Angle ◽  
Hall Thrusters ◽  
Plume Divergence

Hall thruster plume divergence angle assessment method based on image processing

Measurement ◽  
2014 ◽  
Vol 50 ◽  
pp. 74-77 ◽  
Author(s):  
Yang Tianci ◽  
Wei Liqiu ◽  
Han Liang ◽  
Zhang Chaohai ◽  
Yu Daren
Keyword(s):  
Image Processing ◽  
Assessment Method ◽  
Hall Thruster ◽  
Divergence Angle ◽  
Plume Divergence

scholarly journals Discrete Spectral Local Measurement Method for Testing Solar Concentrators

2012 ◽  
Vol 2012 ◽  
pp. 1-8 ◽  
Author(s):  
Huifu Zhao ◽  
Hua Liu ◽  
Lei Jing ◽  
Ying Liu ◽  
Chun Li ◽  
...  
Keyword(s):  
Measurement Method ◽  
Large Diameter ◽  
Test System ◽  
Test Method ◽  
Divergence Angle ◽  
Local Measurement ◽  
Two Stage ◽  
Indoor Concentration ◽  
Outdoor Concentration ◽  
Concentration Test

In order to compensate for the inconvenience and instability of outdoor photovoltaic concentration test system which are caused by the weather changes, we design an indoor concentration test system with a large caliber and a high parallelism, and then verify its feasibility and scientificity. Furthermore, we propose a new concentration test method: the discrete spectral local measurement method. A two-stage Fresnel concentration system is selected as the test object. The indoor and the outdoor concentration experiments are compared. The results show that the outdoor concentration efficiency of the two-stage Fresnel concentration system is 85.56%, while the indoor is 85.45%. The two experimental results are so close that we can verify the scientificity and feasibility of the indoor concentration test system. The light divergence angle of the indoor concentration test system is 0.267° which also matches with sunlight divergence angle. The indoor concentration test system with large diameter (145 mm), simple structure, and low cost will have broad applications in solar concentration field.

scholarly journals Plume Divergence and Discharge Oscillations of an Accessible Low-Power Hall Effect Thruster

2021 ◽  
Vol 11 (4) ◽  
pp. 1973
Author(s):  
Matthew Baird ◽  
Thomas Kerber ◽  
Ron McGee-Sinclair ◽  
Kristina Lemmer
Keyword(s):  
Hall Effect ◽  
Discharge Current ◽  
Electric Propulsion ◽  
Low Voltage ◽  
Discharge Voltage ◽  
Operating Conditions ◽  
Low Flow ◽  
Divergence Angle ◽  
Frequency Spectra ◽  
Plume Divergence

Hall effect thrusters (HETs) are an increasingly utilized proportion of electric propulsion devices due to their high thrust-to-power ratio. To enable an accessible research thruster, our team used inexpensive materials and simplified structures to fabricate the 44-mm-diameter Western Hall Thruster (WHT44). Anode flow, discharge voltage, magnet current, and cathode flow fraction (CFF) were independently swept while keeping all other parameters constant. Simultaneously, a Faraday probe was used to test plume properties at a variety of polar coordinate distances, and an oscilloscope was used to capture discharge oscillation behavior. Plasma plume divergence angle at a fixed probe distance of 4.5 thruster diameters increased with increasing anode flow, varying from 36.7° to 37.4°. Moreover, divergence angle decreased with increasing discharge voltage, magnet current, and CFF, by 0.3°, 0.2°, and 8°, respectively, over the span of the swept parameters. Generally, the thruster exhibited a strong oscillation near 90 kHz, which is higher than a similarly sized HET (20–60 kHz). The WHT44 noise frequency spectra became more broadband and the amplitude increased at a CFF of less than 1.5% and greater than 26%. Only the low flow and low voltage operating conditions showed a quiescent sinusoidal discharge current; otherwise, the discharge current probability distribution was Gaussian. This work demonstrates that the WHT44 thruster, designed for simplicity of fabrication, is a viable tool for research and academic purposes.

Sign in / Sign up

Export Citation Format

Share Document