@article{Julanda Al-Mawali_Sam M Dakka_2016, title={NUMERICAL INVESTIGATION FOR THE ENHANCEMENT OF THE AERODYNAMIC CHARACTERISTICS OF AN AEROFOIL BY USING A GURNEY FLAP}, volume={12}, url={https://geomatejournal.com/geomate/article/view/3203}, abstractNote={<p>Numerical investigation was carried out to determine the effect of a Gurney Flap on NACA<br>0012 aerofoil performance with emphasis on Unmanned Air Vehicles applications. The study examined<br>different configurations of Gurney Flaps at high Reynolds number of Re = 3.6 × 105</p> <p>in order to determine<br>the optimal configuration. The Gurney flap was tested at different heights, locations and mounting angles.<br>Compared to the clean aerofoil, the study found that adding the Gurney Flap increased the maximum lift<br>coefficient by19%, 22%, 28%, 40% and 45% for the Gurney Flap height of 1%C, 1.5%C, 2%C, 3%C and<br>4%C respectively, C represents the chord of the aerofoil. However, it was also found that increasing the<br>height of the gurney beyond 2%C leads to a decrease in the overall performance of the aerofoil due to the<br>significant increase in drag penalty. Thus, the optimal height of the Gurney flap for the NACA 0012 aerofoil<br>was found to be 2%C as it improves the overall performance of the aerofoil by 21%. As for the location, it<br>was found that the lifting-enhanced effect of the gurney flap decreases as it is shifted towards the leading<br>edge. Thus the optimal location of the Gurney Flap mounting was found to be at the trailing edge or at<br>distances smaller than 10%C. The Gurney flap was also tested at different mounting angles of -45, 90 and<br>+45 degrees and it was found that the Gurney flap at +45 mounting angle leads to the optimal performance of<br>the aerofoil</p>}, number={34}, journal={GEOMATE Journal}, author={Julanda Al-Mawali and Sam M Dakka}, year={2016}, month={Nov.}, pages={21–27} }