S0503-1-1 Development of Open Type Cross-flow Runner for Environmentally Friendly Nano-hydraulic Turbine : Applications to Rapid and Shallow Stream

Abstract

The aim of this study was to develop an environmentally friendly nano-hydraulic turbine utilizing rapid and shallow streams. Previous result on same system was found that power coefficient of runner reaches at 0.18 because of stagnation of working fluid upstream and inside of runner. So we adopted open type cross-flow runner to solve the problem. In this study, it was investigated the optimum angle of blade and the relationship between the power performance and the clearance between the runner and the bottom wall of the channel and the thickness of water stream collide with runner. As a result, it was clarified that the power coefficient increases with decrease of the clearance, with increase of the thickness of water stream collide with runner, the optimized angle of blade is 24 degrees and the maximum power coefficient is 0.41.