Characterization of a radio-frequency inductively coupled electrothermal plasma thruster

A radio-frequency (RF) inductively coupled electrothermal plasma thruster operating with argon is experimentally characterized for different mass flow rates, RF powers, and propellant injection configurations. Depending on the propellant mass flow rate, significant neutral gas heating is observed wi...

Full description

Saved in:
Bibliographic Details
Published in:Journal of applied physics 2021-07, Vol.130 (4)
Main Authors: Lafleur, T., Corr, C. S.
Format: Article
Language:English
Subjects:
Applied physics
Argon
Gas heating
Gas temperature
Mass flow rate
Neutral gases
Power transfer
Propellant injection
Radio frequency
Specific impulse
Stagnation pressure
Thrusters
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:A radio-frequency (RF) inductively coupled electrothermal plasma thruster operating with argon is experimentally characterized for different mass flow rates, RF powers, and propellant injection configurations. Depending on the propellant mass flow rate, significant neutral gas heating is observed with effective stagnation temperatures around 2000 K (giving a maximum estimated thrust and specific impulse of about 100 mN and 125 s, respectively) for absorbed powers between 300 and 500 W. A self-consistent theoretical discharge model is developed and used to study the basic physics and operation of RF electrothermal thrusters, and predictions of the gas temperature are in good agreement with experimental measurements. The model identifies primary power inefficiencies as electron-neutral excitation losses and neutral gas heat losses to the thruster walls. Both experimental and theoretical results indicate that a relatively high stagnation pressure (of the order of 100 Torr or higher) is critical for high performance. For pressures significantly below this the electron-neutral collisional power transfer is too low to effectively heat the neutral gas.
ISSN:0021-8979
1089-7550
DOI:10.1063/5.0056124