Departmental Bulletin Paper 二重翼列波力タービンの性能特性

吉田, 光弘  ,  黒川, 由美  ,  奥村, 哲也  ,  林, 秀千人  ,  瀬戸口, 俊明  ,  濱川, 洋充

48 ( 90 )  , pp.15 - 22 , 2018-01 , 長崎大学大学院工学研究科
It is proposed the new type turbine for OWC that consists of Wells and Impulse rotors. Wells and impulse rotors are setconcentrically for both high efficiency and starting characteristics. This paper presentsthe concept of the turbine and some geometrical variation withthe numerical simulations in steady flow condition; hub ratio, split duct length and sweep blade. The maximum efficiency is obtained at the low flow coefficient that is fitted to the high-speed operation. The variation of efficiency with flow coefficient is small for large flow coefficient that advantages to the starting characteristics. The maximum efficiency is large at small hub ratio for the flow rate of wells turbine part decreased. The swept blade is not fit for the impulse rotor. The split duct is designed to fit the flow coefficient at the maximum efficiencies of Wells and Impulse turbines. It is pointed out that the geometry of the split duct is important to improve the turbine performance.

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