A performance prediction method coupled with Navier-Stokes codes is used to improve the performance of a Francis turbine with high specific speed. In this study, the improvement was concentrated for the modification of the stay vane shape because it was identified to be the inefficient component of the turbine through our design philosophy. The numerical simulations were firstly made for the passage around stay vanes and guide vanes (called hereinafter a distributor) using two Navier-Stokes codes, for which one is author's original code and another is STAR-CD in a wide use, to minimize the head loss in the passage. Second, the flow simulation of the runner is carried out by using our original code, then the performances of the turbine are predicted for two cases of the original and the modified stay vanes under the combination of above runner. It was obtained from these studies that the efficiency-up of about 1% may be achieved by the improvement of stay vanes. Finally, model tests were carried out for above two cases to verify the prediction accuracy and resulted in good agreements between the predicted result and the measurement.
|ホスト出版物のタイトル||Proceedings of the 1999 3rd ASME/JSME Joint Fluids Engineering Conference, FEDSM'99, San Francisco, California, USA, 18-23 July 1999 (CD-ROM)|
|出版社||American Society of Mechanical Engineers|
|出版ステータス||Published - 1999 12月 1|
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