水中駆動衝動水車の開発

（ノズル幅と水車性能との関係）

抄録

This study focuses on improving a newly developed submerged impulse turbine suitable for small hydropower generation in drinking water pipelines. The authors have investigated the turbine efficiency, torque loss mechanism, and the torque loss suppression method for high-performance submerged impulse turbine. A previous study proposed the nozzle disk and shows the disk makes torque loss reduce and shows the improvement of submerged impulse turbine performance. This report focuses on how the nozzle exit width, which is mounted on the nozzle disk, on the turbine performance. It is also essential to design the turbine nozzle under various head and flow discharge conditions. The nozzle disk has a nozzle, and the nozzle width is 50%, 70%, and 90% of the blade height. The turbine performance test becomes better for wider nozzle width. It is due to the difference in uniformity of pressure distribution acting on a blade pressure side. The wider nozzle shows impartiality pressure distribution.