Observatorio de I+D+i UPM

Memorias de investigación
Communications at congresses:
Ionization-induced azimuthal oscillation in Hall Effect Thrusters
Year:2011
Research Areas
  • Space r&d,
  • Aerospace industry
Information
Abstract
In this paper recent results based on a local linear stability analysis of the ionization region a Hall Thruster are presented. A one dimensional azimuthal framework is used including three species: neutrals, singly-charged ions and electrons. A simplified linear model is developed with the aim of deriving analytical expressions that characterize the instability. The results indicate the existence of an instability that gives rise to an azimuthal oscillation with a mode number m = 1. According to the model, the instability seems to appear only in regions where the ionization and the electric field make it possible to have positive gradients of plasma density and ion velocity at the same time. A more complex model is also solved numerically to validate the analytical results. Moreover, parametric analyses are carried out with respect to the main parameters of the complex model. As the temperature increases and the neutral-to-plasma density ratio decreases, the growth rate of the instability decreases down to a limit where azimuthal perturbations are no longer unstable. The computation of the eigenvalues and eigenvectors of the linear stability problem shows a correlation between the plasma density and electron axial velocity perturbations. Consequently, a net axial electron current is generated by this oscillation and thus it is possibly linked to anomalous diffusion.
International
Si
Congress
32nd International Electric Propulsion Conference
960
Place
Wiesbaden, Germany
Reviewers
Si
ISBN/ISSN
Start Date
11/09/2011
End Date
15/09/2011
From page
1
To page
13
Proceedings of the 32nd International Electric Propulsion Conference
Participants
  • Autor: Diego Escobar Anton (UPM)
  • Autor: Eduardo Ahedo Galilea (UPM)
Research Group, Departaments and Institutes related
  • Creador: Grupo de Investigación: Análisis y experimentación en mecánica de fluidos y combustión
  • Departamento: Fundamentos Matemáticos de la Tecnología Aeronáutica
S2i 2020 Observatorio de investigación @ UPM con la colaboración del Consejo Social UPM
Cofinanciación del MINECO en el marco del Programa INNCIDE 2011 (OTR-2011-0236)
Cofinanciación del MINECO en el marco del Programa INNPACTO (IPT-020000-2010-22)