Performance Improvement of Diagonal Type MHD Generator by Modification of PTO Electrode Configuration

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  • Takahashi Toru
    Graduate School of Systems and Information Engineering, University of Tsukuba
  • Fujino Takayasu
    Graduate School of Systems and Information Engineering, University of Tsukuba
  • Ishikawa Motoo
    Graduate School of Systems and Information Engineering, University of Tsukuba

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Other Title
  • ＰＴＯ電極構成の変更によるダイアゴナル形ＭＨＤ発電機の性能改善に関する検討
  • PTO デンキョク コウセイ ノ ヘンコウ ニ ヨル ダイアゴナルケイ MHD ハツデンキ ノ セイノウ カイゼン ニ カンスル ケントウ

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Abstract

Time dependent three-dimensional numerical analysis is carried out in order to clarify causes of voltage loss occurring near power takeoff regions and to suggest how to reduce the voltage loss for the scramjet engine driven MHD generator which was developed under the hypersonic vehicle electric power system program in USA. The numerical results under the experimental condition show that the local positive electric field is induced near the power takeoff electrodes. The phenomenon is due to the electric field loss by the high electric current through the weakly ionized plasma with low temperature and also by the low electromotive force near the power takeoff electrodes. When the configuration of power takeoff electrodes is modified, the current density near the power takeoff electrodes becomes small and the electromotive force becomes strong. The electric power output under the optimum electrode configuration of power takeoff is improved by 22 percent, compared with the value under the experimental condition.

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