Bulletin of the American Physical Society
76th Annual Gaseous Electronics Conference
Volume 68, Number 9
Monday–Friday, October 9–13, 2023; Michigan League, Ann Arbor, Michigan
Session HR2: Electric Propulsion IV
10:00 AM–12:00 PM,
Thursday, October 12, 2023
Room: Michigan League, Michigan
Chair: Yevgeny Raitses, Princeton Plasma Physics Laboratory
Abstract: HR2.00001 : Simulations of the effect of neutral dinamics in magnetic nozzle expansions.*
10:00 AM–10:15 AM
Presenter:
Diego García
(Universidad Carlos III de Madrid)
Authors:
Diego García
(Universidad Carlos III de Madrid)
Mario Merino
(Universidad Carlos III de Madrid)
Eduardo Ahedo
(Universidad Carlos III de Madrid)
Most numerical fluid simulation codes have employed two fluid models to study the behaviour of magnetic nozzle expansion. However, experiments by Makrinich and Fruchtman have shown that ion-neutral collisions might increase total thrust in E x B devices and, on the other hand, results by Wachs and Jorns suggest that electron-neutral collisions decrease the amount of power available for ion acceleration and therefore decrease nozzle performance.
The present study employs a two-dimensional axisymmetric three fluid model of the plasma expansion. The model consists of a quasineutral, partially ionized plasma consisting of massless, warm, polytropic electrons; singly-charged, partially magnetized, cold ions and polytropic, neutrals, lastly, ionization and charge-exchange collisions are considered as source terms in the continuity and momentum equations of both ions and neutrals.
With these assumptions we obtain relevant maps for the different plasma properties. The effect of neutral dynamics in thrust generation is also studied considering different initial ionization degrees in the source.
*The ZARATHUSTRA project has received funding from the European Research Council (ERC) under th European Union's Horizon 2020 research and innovation programme (grant agreement No 950466)
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