A Darrieus-type turbine has been investigated for extra-low head hydropower utilization. In the present paper, authors'research on Darrieus-type hydraulic turbine is briefly reviewed. The working principle of Darrieus turbine is explained with advantage of its simple structure, at first. Then the fluid-dynamic difference between rotating and linear motions of a blade in a uniform flow is clarified with guiding principle of high performance design of Darrieus turbine. Cavitation problem is also described. Next, effects of duct-casing, consisting of an intake, runner section and draft tube, are discussed and a simplified structure of Darrieus turbine is shown by installing the inlet nozzle. Finally, in the practical use, an adjustment of inlet nozzle section by lowering the inlet nozzle height is proposed when flow rate is varied temporally and seasonally.
|ジャーナル||IOP Conference Series: Earth and Environmental Science|
|出版ステータス||出版済み - 2012|
|イベント||26th IAHR Symposium on Hydraulic Machinery and Systems - Beijing, 中国|
継続期間: 8月 19 2012 → 8月 23 2012
!!!All Science Journal Classification (ASJC) codes