Effect of Conventional Multistage Savonius wind Turbines on the Performance of the Turbine at Low Wind Velocity

Nawfal M. Ali, Dr.A.K. Abdul Hassan and Dr. Sattar Aljabair

This paper presents a model for the evaluation of the optimal design of Savonius vertical wind turbine by CFD analysis and experimental tests, through analyzing the stage number, number of blades and tip speed ratio. For this purpose, a full validation campaign has been carried out through a systematic comparison of numerical simulations with wind tunnel experiments data and other references for grid dependency and correlation coefficient. In this case, results show that the correlation coefficient (0.936) better than the correlation coefficient (0.93) in reference [17]. Also, grid dependency was included and described by average y+ values between 1-5.The experiments were done for all Savonius wind turbine models by using a subsonic wind tunnel under open type test section with airflow speed was 3 m/s and different tip speed ratio TSR. The results show that the power coefficient Cp increases when TSR increases to a certain value then decreases for all models. The torque coefficient CT decreases when TSR increases for all models. Savonius wind turbine performance with two blades rotor good agreement was obtained between experimental and numerical results gave better results than other models at low wind speed. The maximum experimental Cp and CT for two brackets rotor are 0.23 at TSR 0.685 and 0.402 at TSR 0.175 respectively.

Volume 11 | Issue 11

Pages: 229-239

DOI: 10.5373/JARDCS/V11I11/20193192