808 ダクト付きダリウス形水車の性能に及ぼすケーシング壁隙間の影響と簡易構造化(2)(OS8-2 水力エネルギーの活用技術,OS8水力エネルギーの活用技術,オーガナイズドセッション)

概要

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A ducted Darrieus-type turbine, having a cost-advantage of the simple structure though not yielding so good efficiency, has been proposed for extra-low head hydropower utilization of total head less than 2m. In the case of installing the runner in the duct, a narrow intake type brings about higher efficiency than that of the parallel intake with the same width of runner shaft section. In the latter application, the clearance between the casing wall and the runner pitch circle roles an important factor for turbine performance as flow distortion occurs toward the side wall. Then, turbine performance is severely deteriorated. On the other hand in the former application, effects of the clearance on turbine performance are not clarified yet, though the flow distortion is supposed to become weakened due to the narrow intake before the runner. In the present paper, the effects on turbine performance are experimentally examined with help of flow measurement and the result will be compared with the results of parallel walls. Then the design guideline of ducted Darrieus-type turbine with narrow intake will be proposed.
一般社団法人日本機械学会の論文
2007-11-17