Study on breathing mode oscillation suppression of self-excited Hall thrusters

2012 ◽  
Vol 30 (6) ◽  
pp. 061304 ◽  
Author(s):  
Wei Liqiu ◽  
Han Ke ◽  
Wang Chunsheng ◽  
Li Hong ◽  
Zhang ChaoHai ◽  
...  
Keyword(s):  
Hall Thrusters ◽  
Breathing Mode ◽  
Oscillation Suppression ◽  
Mode Oscillation

scholarly journals Numerical and Experimental Investigation of Longitudinal Oscillations in Hall Thrusters

Aerospace ◽  
2021 ◽  
Vol 8 (6) ◽  
pp. 148
Author(s):  
Vittorio Giannetti ◽  
Manuel Martín Saravia ◽  
Luca Leporini ◽  
Simone Camarri ◽  
Tommaso Andreussi
Keyword(s):  
Discharge Current ◽  
Fluid Model ◽  
Low Frequency ◽  
Hall Thruster ◽  
Hall Thrusters ◽  
Current Signal ◽  
Plasma Parameters ◽  
Plasma Properties ◽  
Breathing Mode ◽  
Spatio Temporal

One of the main oscillatory modes found ubiquitously in Hall thrusters is the so-called breathing mode. This is recognized as a relatively low-frequency (10–30 kHz), longitudinal oscillation of the discharge current and plasma parameters. In this paper, we present a synergic experimental and numerical investigation of the breathing mode in a 5 kW-class Hall thruster. To this aim, we propose the use of an informed 1D fully-fluid model to provide augmented data with respect to available experimental measurements. The experimental data consists of two datasets, i.e., the discharge current signal and the local near-plume plasma properties measured at high-frequency with a fast-diving triple Langmuir probe. The model is calibrated on the discharge current signal and its accuracy is assessed by comparing predictions against the available measurements of the near-plume plasma properties. It is shown that the model can be calibrated using the discharge current signal, which is easy to measure, and that, once calibrated, it can predict with reasonable accuracy the spatio-temporal distributions of the plasma properties, which would be difficult to measure or estimate otherwise. Finally, we describe how the augmented data obtained through the combination of experiments and calibrated model can provide insight into the breathing mode oscillations and the evolution of plasma properties.

scholarly journals Numerical Simulation of Breathing Mode Oscillation on Bubble Detachment

Fluids ◽  
2020 ◽  
Vol 5 (2) ◽  
pp. 96
Author(s):  
Takao Oku ◽  
Hiroyuki Hirahara ◽  
Tomohiro Akimoto ◽  
Daiki Tsuchida
Keyword(s):  
Natural Frequency ◽  
Cfd Simulation ◽  
Low Frequency ◽  
Sound Emission ◽  
Breathing Mode ◽  
Bubble Deformation ◽  
Mode Oscillation ◽  
Computational Fluid Dynamics Cfd ◽  
Oscillation Frequencies ◽  
Air Column

When a bubble detaches from a nozzle immersed in water, a sound is emitted owing to the detachment. The bubble deformation and sound emission generated after detachment has been investigated in many studies, in which the breathing mode with a natural frequency was discussed based on the dynamics of the interface between the air and water. In this study, the deformation of a bubble was observed, and the sound emitted upon detachment was measured experimentally. To analyze the bubble deformation process, a computational fluid dynamics (CFD) simulation was conducted using the volume of fluid (VOF) method to predict the sound emission. In the analysis, the deformation behavior, the oscillation frequencies, sound pressure, and radius variation were discussed by comparing the numerical and experimental data. Furthermore, the natural frequency and low frequency vibrations were discussed based on the interference between the detached bubbles and the air column vibrations.

scholarly journals The origin of the breathing mode in Hall thrusters and its stabilization

2021 ◽  
Vol 130 (5) ◽  
pp. 053305
Author(s):  
T. Lafleur ◽  
P. Chabert ◽  
A. Bourdon
Keyword(s):  
Hall Thrusters ◽  
Breathing Mode

Impact of Hall thrusters on communication system phase noise

1995 ◽  
Author(s):  
James Dickens ◽  
J Mankowski ◽  
M Kristiansen ◽  
E O'Hair
Keyword(s):  
Phase Noise ◽  
Communication System ◽  
Hall Thrusters ◽  
System Phase
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