ICOPE-15-1018 Effect of Reynolds number on the performance and approximate modeling of the small straight-bladed vertical-axis wind turbine

抄録

Effect of Reynolds number on the torque and power characteristics of a small straight-bladed vertical axis wind turbine has been investigated experimentally under various wind velocity. The maximum mean torque coefficient and the maximum mean power coefficient increase with increasing Reynolds number based on wind velocity and representative length of wind turbine. The tip speed ratio for the maximum mean torque coefficient is almost independent of Reynolds number. Otherwise, the tip speed ratio for the maximum power coefficient increased as increasing Reynolds number. When the curvature parameter and the solidity represented forms of the wind turbine are same, the wind turbine performance can be successfully explained by the simple analytical functions, namely, the mean torque and the mean power coefficients can be represented well by the logarithmic functions of Reynolds number and quadratic or cubic function of the tip speed ratio. The proposed approximate equations successfully predict the experimental data for the particularly higher tip speed ratio.