Effect of bio-inspired sinusoidal leading-edges on wings

Abstract Observations of maneuvering humpback whales have revealed unique hydrodynamic performance hypothesized to be a result of tubercles on the leading-edge of the whales' pectoral flippers. Inspired by this biological observation, it is shown sinusoidal leading-edge wings prevent the dramatic loss of lift caused by stall and instead generate a gradual decrease in lift with as much as 25% higher lift in the poststall regime. Six different wing geometries, smooth and sinusoidal leading-edge models, swept and unswept configurations, were tested at angles of attack of −2 to 24 degrees at Reynolds numbers between 100,000 and 500,000. Oil surface flow visualization and CFD results reveal variations in flow phenomena between the smooth and sinusoidal leading-edge configurations.

[1]  Joao M.M. Sousa,et al.  Low-Reynolds-Number Effects in Passive Stall Control Using Sinusoidal Leading Edges , 2012 .

[2]  N. Karthikeyan,et al.  Experimental Studies on the Effect of Leading-Edge Tubercles on Laminar Separation Bubble , 2014 .

[3]  V. V. Kozlov,et al.  Disturbances Growth in Boundary Layers on Classical and Wavy Surface Wings , 2008 .

[4]  Marcelo H. Kobayashi,et al.  Numerical Study of stall delay on humpback whale flippers , 2008 .

[5]  Con J. Doolan,et al.  Reduction of flow induced airfoil tonal noise using leading edge sinusoidal modifications , 2012 .

[6]  Klaus A. Hoffmann,et al.  Numerical Analysis of Effects of Leading-Edge Protuberances on Aircraft Wing Performance , 2012 .

[7]  S. Winoto,et al.  Effect of Flat Plate Leading Edge Pattern on Structure of Streamwise Vortices Generated in Its Boundary Layer , 2014 .

[8]  A. G. Sheard,et al.  On the Role of Leading-Edge Bumps in the Control of Stall Onset in Axial Fan Blades , 2013 .

[9]  Laurens E. Howle,et al.  Computational Evaluation of the Performance of Lifting Surfaces with Leading-Edge Protuberances , 2011 .

[10]  Markus Raffel,et al.  Dynamic Stall Control by Passive Disturbance Generators , 2013 .

[11]  F. Fish,et al.  Hydrodynamic design of the humpback whale flipper , 1995, Journal of morphology.

[12]  Mark W. Lohry,et al.  Characterization and design of tubercle leading-edge wings , 2012 .

[13]  K. Hansen,et al.  Performance Variations of Leading-Edge Tubercles for Distinct Airfoil Profiles , 2011 .

[14]  Hamid Johari,et al.  Computation of Flow Field Around an Airfoil with Leading-Edge Protuberances , 2012 .

[15]  Phillip Joseph,et al.  Experimental and numerical investigation of turbulence-airfoil noise reduction using wavy edges , 2013 .

[16]  F. Fish,et al.  The tubercles on humpback whales' flippers: application of bio-inspired technology. , 2011, Integrative and comparative biology.

[17]  Hamid Johari,et al.  Effects of Leading Edge Protuberances on Airfoil Performance , 2006 .

[18]  Mingming Zhang,et al.  Aerodynamic Control of Low-Reynolds-Number Airfoil with Leading-Edge Protuberances , 2013 .

[19]  V. T. Nguyen,et al.  THE EFFECT OF LEADING EDGE PROTUBERANCES ON THE PERFORMANCE OF SMALL ASPECT RATIO FOILS , 2012 .

[20]  Alistair Revell,et al.  Flow over a Wing with Leading-Edge Undulations , 2015 .

[21]  Alessandro Corsini,et al.  The application of sinusoidal blade-leading edges in a fan-design methodology to improve stall resistance , 2014 .

[22]  Hamid Johari,et al.  Effects of Leading-Edge Protuberances on Airfoil Performance , 2007 .

[23]  Joao Melo De Sousa,et al.  Numerical Study on the Use of a Sinusoidal Leading Edge for Passive Stall Control at Low Reynolds Number , 2013 .

[24]  Christopher J. Roy,et al.  Verification of the Loci-CHEM CFD Code using the Method of Manufactured Solutions , 2004 .

[25]  Laurens E. Howle,et al.  Experimental Evaluation of Sinusoidal Leading Edges , 2007 .

[26]  G. Lauder,et al.  Passive and Active Flow Control by Swimming Fishes and Mammals , 2006 .

[27]  N. Weatherill,et al.  Unstructured grid generation using iterative point insertion and local reconnection , 1995 .

[28]  Edward A. Luke,et al.  Numerical simulations of mixtures of fluids using upwind algorithms , 2007 .

[29]  F. Fish,et al.  Leading-edge tubercles delay stall on humpback whale (Megaptera novaeangliae) flippers , 2004 .

[30]  Ernst A. van Nierop,et al.  How bumps on whale flippers delay stall: an aerodynamic model. , 2008, Physical review letters.