EXPERIMENTAL AND NUMERICAL ANALYSIS FOR MODIFICATION OF SEPARATED BOUNDARY LAYERS OVER NREL'S S822 USING BLOWING/SUCTION TECHNIQUES

Abstract

The majority of wind turbine models are built to work in areas with high wind speeds. Such turbines would waste a lot of the energy available in low-speed zones. The performance of these turbines should be improved using sophisticated techniques in order to match the locations' available wind energy. Therefore, in the current study, active flow control (AFC) was applied over the NREL S822 profile (small horizontal wind turbine) using blowing/suction techniques to determine where these methods will be most effective. At a constant speed of 15.8 m/s and an angle of attack of 18 deg, blowing and suction techniques have been used either together or individually. The results showed that the use of the NREL S822 aerofoil with AFC enhances the wind turbine performance by an average of 15% compared to using no AFC. It was discovered that the technique at the B3 (x/c = 0.54) slot was the best blowing technique, and the technique at the S1 (x/c = 0.18) slot was the best suction case and the maximum lift-to-drag ratio (C<sub>L</sub>/C<sub>D</sub>) when S1B3 was activated, indicating that S1B3 is the best technique with an 87% improvement rate.