Effects of Gurney Flaps on Aerodynamic Performance of Wind Turbine Airfoils
Introduction
To enhance the efficiency and performance of wind turbines, innovative flow control techniques are being explored. One promising approach involves the deployment of Gurney flaps, small vertical tabs attached to the trailing edge of airfoils. This study investigates the aerodynamic effects of Gurney flaps on a wind turbine airfoil under varying pitch angles.
Vortex Trapping Capability and Lift Improvement
Gurney flaps act as vortex generators, creating small vortices that alter the airflow over the airfoil. These vortices reduce flow separation and improve lift, especially at high angles of attack. By deploying Gurney flaps, the overall aerodynamic performance of the wind turbine airfoil can be enhanced.
Experimental Setup and Results
An airfoil with a Gurney flap was tested in a wind tunnel at various pitch angles. The results showed that the Gurney flap significantly improved lift and reduced drag. Specifically, the lift coefficient increased by up to 10% at high angles of attack. This improvement is attributed to the vortex trapping capability of the cavity created by the Gurney flap.
Gurney Flaps as Passive Flow-Control Device
Gurney flaps are a passive flow-control device, meaning they do not require any external power or control systems. They are relatively inexpensive and easy to implement, making them an attractive option for enhancing wind turbine performance. By alleviating adverse flow effects, Gurney flaps can contribute to increased power generation and reduced maintenance costs.
Conclusion
The experimental study demonstrated the positive effects of Gurney flaps on the aerodynamic performance of a wind turbine airfoil. The vortex trapping capability of the cavity and the lift improvement mechanism result in enhanced lift and reduced drag. Gurney flaps are considered a valuable passive flow-control device for wind turbine applications, offering potential benefits in terms of efficiency, power generation, and maintenance.
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