フランシス形ポンプ水車の多段化における戻り流路の検討 : 第1報, 水車運転時の最高効率点付近における流れと性能の把握

概要

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Flow pattern and performace of a return channel model were investigated experimentally, as the preliminary step to optimize its profile. The flow angle suddenly changes close to the casing wall near the return channel inlet, and the low energy fluid in this region is carried to the suction side of the return vane. Its fluid finally accumulates over a wide region in the hub on the suction side. This process gives rise to marked the hydraulic loss. Moreover, two kinds of flow pattern appear in the channel outlet section. These flow patterns are maintained in the U-turn bend and meet the stay ring with negative incidence angle. Therefore, the shock and mixing losses cannot be disregarded in the stay ring. The flow pattern, however, becomes uniform at the next-stage runner inlet.
一般社団法人日本機械学会の論文
1996-02-25