クロスフロー水車のキャビテーション発生時における水力性能に関する研究

抄録

The condition to cavitation occurring and the effects of cavitation on the performance of a cross-flow turbine were investigated using an experimental apparatus placed high above the water surface of storage tank while changing the effective head and the runner chamber pressure. The results confirmed that cavitation occurred in four regions around the runner and in one region on the wall surface of the guide vane. The influence of the net head on the occurrence of cavitation was considerable for high NPSH. It was cleared that the occurrence of cavitation inside the runner or in a region of water reentering would have a positive effect on the efficiency. The cavitation in the region, where cavitation occurring confirmed by experiment, could be recreated using CFD.