Dissipative boundary layer electrical shunts are eliminated in a two-phase liquid-metal magnetohydrodynamic (MHD) generator by displacing the slow moving, conducting liquid boundary layer adjacent the insulating walls of the generator with a thin gas layer. This is accomplished by injecting an inert gas into the generator channel in the direction of flow of the working fluid through the insulating walls at several locations through a narrow slit extending across the insulating walls.
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