羽根入口角の異なる一枚羽根ポンプ逆転水車に作用するラジアルスラストの成分分析

抄録

Since many small hydroelectric power use a runner with multiple blades that do not have a dust removal facility, the increase in the cost of maintenance due to foreign matter obstruction is a problem. Therefore, the authors tried to use a single-blade centrifugal pump as a reverse running turbine and reported the effect of the blade inlet angle on radial thrust of this turbine, however the cause of the effect has not been clarified. In this study, we investigated the effect of the blade inlet angle on radial thrust and its constituent components by CFD. As a result, the radial thrust of the hydraulic part is relatively larger as the blade inlet angle is large, especially in the vicinity of θ*=180° in φ=0.037, and relatively smaller as the blade inlet angle is large, especially in the vicinity of θ*=90°～270° in φ=0.077, which greatly affects the difference in the fluctuation component due to the blade inlet angle. In addition, in φ=0.037, there is no significant difference in the direction in which the force acts on each blade phase angle in any component of β_b1=8°, 24°, but in φ=0.077, the pressure component of β_b1=8°, 24° acts approximately in the -120° direction in the direction in which the other two forces act.