Abstract
An experimental investigation of airfoil aerodynamics control at a low Reynolds number of 5 × 104 was conducted within the attack angle α of 0–90° using a leading-edge protuberance technique. The essence of the technique is to manipulate flow around the airfoil through the effect of a humpback whale-like leading edge. Whereas the mean lift force, drag force, and lift-to-drag ratio were measured using a 3-component force balance, the flow was mainly documented using a particle image velocimetry (PIV). The sinusoidal protuberances effectively suppressed the airfoil stall, although the corresponding aerodynamic performances were impaired to some extent. Meanwhile, the control significantly improved the airfoil aerodynamics in the post-stall α region, i.e., 16° < α < 70°, leading to a maximum 25.0 and 39.2 % increase in lift coefficient and lift-to-drag ratio, respectively, and maximum 20.0 % decrease in drag coefficient. The flow physics behind the observations were discussed.
The project was funded by NNSFC and MOST with Grant Nos. 51222606, 2010DFA62830, and CAS Hundred Talent Program.
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References
Fish FE, Lauder GV (2006) Passive and active flow control by swimming fishes and mammals. Annu Rev Fluid Mech 38:193–224
Goruney T, Rockwell D (2009) Flow past a delta wing with a sinusoidal leading edge: near-surface topology and flow structure. Exp Fluids 47:321–331
Johari H, Henoch C, Custodio D, Levshin A (2007) Effects of leading-edge protuberances on airfoil performance. AIAA J 45(11):2634–2642
Lissaman PBS (1983) Low-reynolds-number airfoils. Annu Rev Fluid Mech 15:223–239
Miklosovic DS, Murray MM, Howle LE (2007) Experimental evaluation of sinusoidal leading edges. J Aircraft 44(4):1404–1407
Van Nierop EA, Alben S, Brenner MP (2008) How bumps on whale flippers delay stall: an aerodynamic model. Phy Rev Lett 100:054502
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Zhang, M.M., Wang, G.F., Xu, J.Z. (2014). Effect of Humpback Whale-like Leading-Edge Protuberances on the Low Reynolds Number Airfoil Aerodynamics. In: Zhou, Y., Liu, Y., Huang, L., Hodges, D. (eds) Fluid-Structure-Sound Interactions and Control. Lecture Notes in Mechanical Engineering. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-40371-2_15
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DOI: https://doi.org/10.1007/978-3-642-40371-2_15
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