A Basic Predator-Prey Type Model for Low Frequency Discharge Oscilations in Hall Thrusters
✍ Scribed by Ch. Wang; L. Wei; D. Yu
- Publisher
- John Wiley and Sons
- Year
- 2011
- Tongue
- English
- Weight
- 227 KB
- Volume
- 51
- Category
- Article
- ISSN
- 0005-8025
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✦ Synopsis
Abstract
The mechanism of low frequency oscillations in Hall thrusters is usually explained using the predator‐prey type model, but the reasonable boundary conditions for the model have not been given. Analyses on thrusters' model equations show that besides the processes of neutral replenishment and ionization avalanche, the effects of dynamic electric field are also necessary for low frequency oscillations. The dynamic electric field reflects the interaction of ionization zone with acceleration zone, and is embodied in boundary conditions of the predator‐prey type model. Furthermore, a basic predator‐prey type model with reasonable boundary conditions and complete physical mechanism is proposed. And the effects of electric field on low frequency oscillations are verified by experiment (© 2011 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)