一枚羽根ポンプ逆転水車のラジアルスラストの計測と数値解析

抄録

In many small hydropower plants, obstruction by foreign body is likely to occur due to the use of a runner with multiple blades. Therefore, we tried to use a single-blade centrifugal pump which is used as a sewage pump as a reverse running turbine to solve this problem. However, an excessive radial thrust occurs due to biased pressure distribution in this runner. In this study, we tried to measure the radial thrust of a single-blade reverse running pump turbine and investigated the behavior of radial thrust with flow rate change by CFD. As a result, it was confirmed that the behavior of the radial thrust with flow rate change between the experimental value and the analysis value, its time-averaged value and the root mean square value of the fluctuation component are qualitatively consistent. Within the range of this study, the time-averaged value and the fluctuation component of the radial thrust had the minimum value even at a flow rate about 35% lower than the maximum efficiency point flow rate, and increased with the increase of the flow rate.