Abstract:Two-dimensional Particle Image Velocimetry (2-D PIV) measurements were performedto study the effect of free-stream turbulence (FST) on the flow around a smooth and rough surface airfoil, at zero angle of attack and under stall conditions. A 0.25-m chord model with an S809 profile, common for horizontal-axis wind turbine applications, was tested at a wind tunnel speed of 10 m/s, resulting in Reynolds numbers based on the chord of Re c ≈182,000 and turbulence intensity levels of up to 6.14%. Results indicate tha… Show more
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