Abstract
The combined effect of an internal slot in an airfoil and transverse leading-edge tubercles on its performance is studied. The internal slot allows flow ventilation from the pressure face to the suction face of the airfoil, effectively delaying flow separation and stall. Previous studies have demonstrated good stall characteristics of airfoils with leading-edge tubercles. It is shown here that the slot results in further improvement of the post-stall performance. The performance characteristics are investigated both numerically and experimentally, with angles of attack in the range of 0°–30° at a chord-Reynolds number of lift and drag coefficients of slotted airfoils with leading-edge tubercles predicted from the computational fluid dynamics study correlate well with the corresponding coefficients determined via experiments. The experimental results show that the lift and drag coefficients of airfoils with leading-edge tubercles are significantly improved for angles of attack exceeding 10° with the inclusion of the internal slot. The slotted airfoil with small leading-edge tubercles outperformed others for angles of attack in the range of 10°–20° with the most improved maximum lift coefficient and maximum lift-to-drag ratio, whereas the slotted airfoil with larger tubercles achieved the best performance for angles of attack in the range of 20°–30°, including more favorable stall characteristics.
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