JPEE  Vol.3 No.7 , July 2015
Unsteady Double Wake Model for the Simulation of Stalled Airfoils
Abstract: In the present work, the recent developed Unsteady Double Wake Model, USDWM, is used to simulate separated flows past a wind turbine airfoil at high angles of attack. The solver is basically an unsteady two-dimensional panel method which uses the unsteady double wake technique to model flow separation and its dynamics. In this paper, the calculated integral forces have been successfully validated against wind tunnel measurements for the FFA-W3-211 airfoil. Furthermore, the computed highly unsteady flow field is analyzed in detail for a set of angles of attack ranging from light to deep stall conditions. 
Cite this paper: Ramos-García, N. , Cayron, A. and Sørensen, J. (2015) Unsteady Double Wake Model for the Simulation of Stalled Airfoils. Journal of Power and Energy Engineering, 3, 20-25. doi: 10.4236/jpee.2015.37004.

[1]   Maskew, B. and Dvorak, F.A. (1978) The Prediction of C1max Using a Separated Flow Model. Journal of the American Helicopter Society.

[2]   Marion, L., Ramos-García, N. and Sorensen, J.N. (2014) Inviscid Double Wake Model for Stalled Airfoils. The Science of Making Torque from Wind. IOP Publishing. Journal of Physics: Conference Series.

[3]   Vezza, M. and Galbraith, R.A.McD. (1985) An Inviscid Model of Unsteady Aerofoil Flow with Fixed Upper Surface Separation. International Journal for Numerical Methods in Fluids, 5, 577-592.

[4]   Zanon, A., Giannattasio, P. and Simao Ferreira, C.J. (2013) A Vortex Panel Method for the Simulation of the Wake Flow past a Vertical Axis Wind Turbine in Dynamic Stall. Wind Energy, 16, 661-680.

[5]   Riziotis, V.A. and Voutsinas, S.G. (2008) Dynamic Stall Modelling on Airfoils Based on Strong Viscous Inviscid Interaction Coupling. International Journal for Numerical Methods in Fluids, 56, 185-208.

[6]   Cayron, A. (2015) Unsteady Inviscid Double-Wake Model for Two-Dimensional Stalled Airfoils. Msc. Project Report. Technical University of Denmark.

[7]   Wu, F., Zeng, N., Zhang, L. and Wu, D. (2004) Interaction of Two-Dimensional Impulsively Started Airfoils. Journal of Marine Science and Application, 3.

[8]   Bjork, A. (1990) A Guide to Data Files from Wind Tunnel Test of a FFA-W3-211 Airfoil at FFA. FFA-V-019, Flyg-tekniska Forsoksanstalten, Sweden.

[9]   Ramos-García, N., Sorensen, J.N. and Shen, W.Z. A Strong Viscous-Inviscid Interaction Model for Rotating Airfoils. Wind Energy, 17, 1957-1984.