Open AccessA Straight-Bladed Vertical-Axis Turbine for Wave Energy Conversion: Effect of Guide-Vane Geometry on Performance
Author(s) -
Y. Hayamizu,
Katsuhiko Kitano,
Takeshi Suzuki,
Shinichi Morita,
Shinya Ohtsuka,
Manabu Takao,
Yoichi Kinoue,
Toshiaki Setoguchi
Publication year - 2021
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1909/1/012054
Subject(s) - wells turbine , turbine , oscillating water column , chord (peer to peer) , torque , rotor (electric) , arc (geometry) , vertical axis wind turbine , geometry , mechanics , mechanical engineering , turbine blade , engineering , physics , energy (signal processing) , wave energy converter , mathematics , computer science , thermodynamics , distributed computing , quantum mechanics
This study proposes a straight-bladed vertical-axis turbine for ocean-wave energy conversion. The aim is to develop a novel air turbine suitable for an oscillating water column in a wave energy plant. To this end, the performances of straight-bladed vertical-axis turbines were investigated for different guide-vane geometries in a wind tunnel experiment. The rotor has four straight blades with an NACA0018 profile, a chord length of 80.5 mm, a pitch diameter of 460 mm, and a blade width of 490 mm. In this study, the guide-vane geometry was varied as arc, semi-arc, and semi-arc with a straight part. Under steady flow conditions, the turbine performance was evaluated by determining the torque, input and flow coefficients, and the turbine efficiency. The semi-arc blade geometry decreased the input coefficient and increased the torque coefficient. Moreover, the semi-arc blade with a straight part improved the starting characteristics of the turbine and its efficiency over a wide range of flow coefficients.