SOME EXPERIMENTS ON THE SPOKE PHENOMENON IN MPD OPERATION.
Deutsche Luft- und Raumfahrt Forschungsbericht,
DEUTSCHE VERSUCHSANSTALT FUER LUFT- UND RAUMFAHRT E V STUTTGART (WEST GERMANY)
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The problem of the appearance of a current spoke in MPD operation has attracted an increasing interest. It is the question of whether the current transfer to the anode occurs in an axisymmetric way or whether the current, or part of it, concentrates in a spoke that rotates, in other works, whether a more or less significant rotating disturbance exists. It is concluded that a spoke must not necessarily exist. Transition to the spoke from axisymmetry seems to happen gradually as destabilizing effects grow. Also we doubt whether the appearance of a rotating disturbance in current transition will necessarily entail serious deviation from axisymmetry of the downstream regions. Author
- Electric and Ion Propulsion