Table of Contents
Advances in Aerospace Engineering
Volume 2014, Article ID 847097, 17 pages
http://dx.doi.org/10.1155/2014/847097
Research Article

Global Modeling of CO2 Discharges with Aerospace Applications

DEDALOS Ltd., Vassilissis Olgas 128, 54645 Thessaloniki, Greece

Received 14 July 2014; Accepted 4 November 2014; Published 18 December 2014

Academic Editor: Martin Tajmar

Copyright © 2014 Chloe Berenguer and Konstantinos Katsonis. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

We developed a global model aiming to study discharges in CO2 under various conditions, pertaining to a large spectrum of pressure, absorbed energy, and feeding values. Various physical conditions and form factors have been investigated. The model was applied to a case of radiofrequency discharge and to helicon type devices functioning in low and high feed conditions. In general, main charged species were found to be for sufficiently low pressure cases and O for higher pressure ones, followed by , CO+, and in the latter case. Dominant reaction is dissociation of CO2 resulting into CO production. Electronegativity, important for radiofrequency discharges, increases with pressure, arriving up to 3 for high flow rates for absorbed power of 250 W, and diminishes with increasing absorbed power. Model results pertaining to radiofrequency type plasma discharges are found in satisfactory agreement with those available from an existing experiment. Application to low and high flow rates feedings cases of helicon thruster allowed for evaluation of thruster functioning conditions pertaining to absorbed powers from 50 W to 1.8 kW. The model allows for a detailed evaluation of the CO2 potential to be used as propellant in electric propulsion devices.