Interest in offshore vertical axis wind turbines (VAWTs) has created a need to study VAWTs at much higher Reynolds numbers than they have previously been studied at. VAWTs are characterised by unsteady aerodynamics, and high Reynolds numbers have the potential to alter the blade aerodynamics significantly. Here, results are reported on an airfoil that is pitched sinusoidally around zero angle of attack at Rec = 1 × 106, at a reduced frequency k = 0.15 and amplitudes of 5? < α < 20?. Since the static stall angle is not exceeded, no stall effects occur. Nevertheless, lift, drag and moment coefficients show noticeable hysteresis. Despite the high amplitudes of oscillation, lift and moment coefficients show reasonable agreement with unsteady aerodynamic theories by Theodorsen and Motta et al. with regard to the width of the hysteresis loops, but have noticeably steeper slopes.
|Original language||English (US)|
|Journal||Journal of Physics: Conference Series|
|State||Published - Sep 22 2020|
|Event||Science of Making Torque from Wind 2020, TORQUE 2020 - Virtual, Online, Netherlands|
Duration: Sep 28 2020 → Oct 2 2020
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)