Despite the big interest in both, micro-air vehicles (MAV) and flow-control strategies, only few studies have investigated the flow-control possibilities over low aspect ratio (LAR) wings flying at low Reynolds numbers (Re). The present study verified the LAR thick airfoils' conformity with the nonlinear lift approximation equation. Then, a moving-wall flow control method was designed and tested over an LAR thick airfoil (0.57 aspect ration (AR), NACA0015 shaped) performing at a chord-based Re of 4 × 104. The moving belt control postponed the stall onset by 25 deg and produced a 103% gain in lift without any saturation signs at a control speed ratio of Ub/U = 6. Particle image velocimetry (PIV) measurements confirmed the effectiveness of the moving-wall control strategy on the upper surface flow reattachment. Moreover, other quantities such as the, vortices, and the swirling strength are investigated.
Lift-Generation and Moving-Wall Flow Control Over a Low Aspect Ratio Airfoil
Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received March 20, 2017; final manuscript received August 6, 2017; published online September 20, 2017. Assoc. Editor: Hui Hu.
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Amin Boukenkoul, M., Li, F., Chen, W., and Zhang, H. (September 20, 2017). "Lift-Generation and Moving-Wall Flow Control Over a Low Aspect Ratio Airfoil." ASME. J. Fluids Eng. January 2018; 140(1): 011104. https://doi.org/10.1115/1.4037681
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