Abstract
A purpose of this study is to improve a performance of a vertical axis marine turbine with variable pitch blades. The study investigated how pitch angle controlled and the roter solidity effect on the turbine efficiency and conducted flume tank experiments using a turbine model. Besides, numerical experiments with CFD calculations were performed. The turbine model has 0.5m in diameter of turbine, 0.6 m length of a blade and removable from 1 to 6 blades with a section of NACA0018, which has an arch camber line. As a method of pitch control system, the cyclic mechanism was applied so pitch angle was absolutely mechanically determined. As a result, when the solidity of 0.293 and setting angle of blade - 7 degrees were set, the model showed the highest performance, which was the turbine efficiency of 55% in 2.0 TSR (λ).
