1994 年 114 巻 9 号 p. 938-944
Power generation experiments have been performed for disk type MHD generators with different channel shape. The increase of enthalpy extraction ratio by enlargement of area ratio has been shown experimentally and the highest enthalpy extraction ratio of 18.0% has been achieved with the area ratio of 6.9. Experimental results have also shown that for the generator with large area ratio, wall static pressure in the MHD channel is kept lower than that for the generator with small area ratio. These results suggest that high Hall parameter can be obtained by enlargement of area ratio. Further we can see that we have to optimize area ratio of both the channel and the supersonic nozzle for optimum generator design. Finally, the effect of fluctuation of seed fraction on power output is discussed. It can be pointed out that more than 20% of enthalpy extraction can be realized when seeding system can be improved to eliminate fluctuation in seed fraction.
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