Abstract
In this paper, we discuss the effect of the cross-sectional shape of a magnet coil upon the reduction of the magnetohydrodynamic (MHD) channel length. Employing a coal-combustion plasma with semiperfect gaseous characteristics, the generator output performance of various magnet coil shapes are evaluated based on the 1-D gasdynamic model. The shape of a magnet coil cross section is optimized for a 1300 MWth supersonic Faraday-type MHD generator with a square inlet cross section. It is shown that the channel length can be shortened by 33% through optimization of the coil shape, in comparison with the case of the crescent-shaped coil producing a uniform magnetic field where the enthalpy extraction is effectively kept unchanged. Also, it is estimated that the capital cost for a stand-alone commercial MHD/steam combined plant can be decreased by more than 6% by means of this coil shape optimization.
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