Abstract
The highlight of the work described was the achievement with a disk type open-cycle MHD duct of a 15% conversion of plasma thermal power to electricity at an estimated isentropic efficiency of greater than or equal to 55%. The corresponding electrical output was 11.2 MW at an applied magnetic field strength of 4.5 Tesla. A coal-derived plasma was simulated by heating an appropriate mixture of molecular gases in a large shock tube facility. The achievement is considered strong evidence that projected efficiencies for commercial size, coal-fired, open-cycle MHD plants can be achieved. It also supports the disk concept as an attractive, simpler design alternative to other (linear) MHD duct configurations. To date, disk performance represents the highest attained in any open-cycle, MHD channel experiment.
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