A liquid-metal agnetohydrodynamic (MHD) power system with power extraction at several stages in the expansion process is discussed and analyzed. Cycle efficiency is shown to improve from the 6% range for a single-stage 1800°F system to the 10% range for multistage 1800°F systems. Cycle efficiency at 2000°F is slightly lower but a smaller radiator area is attainable than at 1800°F. The advantages of lower liquid-metal velocities and MHD generator redundancy are also possible in a multistage system.
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