クロスフロー水車性能に及ぼす羽根車とノズルのすきまの影響

概要

論文の詳細を見る
Generally, the cross-flow turbine is operated at a defined minimum clearance between a nozzle and a runner because increase of the clearance increases the leakage loss. Moreover, the dimension of nozzle-runner clearance influences not only the leakage flow but also the interference between the nozzle and the runner. The interference causes the change of flow conditions at the nozzle exit or inside the runner and thus influences the turbine efficiency. This paper describes the effects of the clearance on the leakage loss and the turbine efficiency. As a main result, it is found that a runner with many blades (30, 34 blades) shows the maximum efficiency at a suitable clearance, and at smaller clearance, the turn-over flow increases and the turbine efficiency decreases.
一般社団法人日本機械学会の論文
1990-09-25