Wind tunnel aerodynamic tests of six airfoils for use on small wind turbines,” Report No. Performance characteristics from wind-tunnel tests of a low-Reynolds-number airfoil,” in AIAA 26th Aerospace Sciences Meeting (1988) Google Scholar Crossref Google ScholarĮxperimental studies of separation on a two-dimensional airfoil at low Reynolds numbers,” AIAA J.Ģ0, 457– 463 (1982). SoarTech Publications, Virgina Beach, VA, 2012), Vol.Īerodynamic measurements at low Reynolds numbers,” AIAA Paper No. Spanwise variations in profile drag for airfoils at low Reynolds numbers,” J. Selig, Summary of Low-Speed Airfoil Data ( Guglielmo, Summary of Low-Speed Airfoil Data ( Giguere, Summary of Low-Speed Airfoil Data ( Hence, in order to understand the aerodynamics at this scale, we need to understand the viscous dynamics of the boundary layer, as elegantly described and analyzed by Frank White.į. In this flow state, lift is increased and drag decreases. At a critical angle, α crit, instabilities in the shear layer grow fast enough to transition to turbulence, which then leads to reattachment before the trailing edge. At low to moderate α, the laminar boundary layer separates before the trailing edge, and as the separation point moves forward, instabilities of the detached shear layer form coherent vortices over the upper (suction) surface. As α is increased from 0, the flow states go through a number of qualitatively distinct phases. The flow fields are complex and their correct description is essential in understanding the nonlinear curves describing the variation of lift and drag coefficients with angle of attack, α. The Reynolds number is low enough to ensure importance of viscous dynamics, and high enough so that instability and transition to turbulence can occur. A combined experimental and numerical study is performed to investigate the flow field and associated aerodynamic forces on a cambered airfoil.
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