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Thessaloníki, Greece

Berenguer C.,DEDALOS Ltd | Katsonis K.,DEDALOS Ltd
International Journal of Aerospace Engineering | Year: 2012

A complete global model for argon was developed and adapted to plasma reactor and plasma thruster modeling. It takes into consideration ground level and excited Ar and Ar+ species and the reactor and thruster form factors. The electronic temperature, the species densities, and the ionization percentage, depending mainly on the pressure and the absorbed power, have been obtained and commented for various physical conditions. © 2012 Chloe Berenguer and Konstantinos Katsonis. Source


Katsonis K.,DEDALOS Ltd | Berenguer C.,DEDALOS Ltd
International Journal of Aerospace Engineering | Year: 2013

A global (volume averaged) model pertaining to N2O discharges is used to design and to study electric propulsion applications, especially helicon plasma thrusters fed with pure N2O and also with N 2/O2 mixtures including air. Results obtained for N 2O feeding are discussed and compared to those pertaining to an air-like N2/O2 mixture feeding. An interesting similarity is observed. Comparison of the N2O model results versus those of Ar shows lower ionization percentage with higher electron temperature for N 2O propellant. © 2013 Konstantinos Katsonis and Chloe Berenguer. Source


Katsonis K.,DEDALOS Ltd | Berenguer C.,DEDALOS Ltd
International Journal of Aerospace Engineering | Year: 2013

We developed a Global Model for N2O plasmas valid for applications in various power, gas flow rate, and pressure regimes. Besides energy losses from electron collisions with N2O, it takes into consideration those due to molecular N2 and O2 and to atomic N and O species. Positive atomic N+ and O+ and molecular N2O+, N2+, and O2+ have been treated as separate species and also negative O- ions. The latter confer an electronegative character to the discharge, calling for modified plasma sheath and plasma potential formulas. Electron density and temperature and all species densities have been evaluated, hence the ionization and dissociation percentages of N2O, N2, and O2 molecules and the plasma electronegativity. The model is extended to deal with N2/O 2 mixtures feedings, notably with air. Rate coefficients and model results are discussed and compared with those from available theoretical and experimental work on ICP and glow discharge devices. © 2013 Konstantinos Katsonis and Chloe Berenguer. Source

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