Abstract
The design criteria of a proposed ac magnetohydrodynamic (mhd) generator are discussed. It is found that electrical losses to the moving fluid are serious unless the duct length-to-width ratio is greater than about 30. Two developments of such a generator are suggested. The first would provide a solution to the problem of power output from a segmented-electrode generator. The second development, that of capacitive power transfer at the electrode-fluid interface, would have many benefits, but its application is found to be severely restricted by the limited dielectric strength of materials.

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