A Shock Tube Study of Nonequilibrium MHD Power Generation

概要

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Results are reported of the experiments with a shock tube on inert-gas MHD power generators utilizing nonequilibrium ionization. By preheating the whole low-pressure chamber of the shock tube, it was possible to seed sufficient amount of potassium to the working gas and to realize the conditions required for MHD power generation. The first type of generator made use of the induced electric field, resulting from the interaction of gas flow and magnetic field, to obtain nonequilibrium ionization. Whereas the steady-flow experiments reported so far have not yielded high electrical conductivities predicted by nonequilibrium theory, the results of detailed measurements in the present device were fairly close to those predictions. The reason is considered to be the absence of appreciable boundary effects and flow instability in experiments of such short durations. The unfavorable effect of small amount of impurities on the generator performance was also demonstrated. The second type of nonequilibrium MHD generator utilizing metastable nitrogen was similarly tested, and was found to be a promising alternative.
一般社団法人日本機械学会の論文