Abstract
Unsteady electrical discharges in a nonequilibrium disk MHD generator and its effects on the flowfield are studied theoretically. Numerical results obtained from time-dependent and one-dimensional MHD equations have shown a periodic motion of the discharge, which induces fluctuations of Hall current and flowfield. Repetitional frequency of the discharge becomes higher with increasing seed fraction and external load resistance. When Joule heating is large, the unsteady discharge becomes limited only near the anode, and a steady discharge dominates over the disk generator. 17 references.
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