Validation of the ATEFlap Dynamic Stall Model

Two exemplary validation graphs for the ATEFlap Model from the publication by Wendler et al. 1 are shown in Fig. 125, where the general sensitivity of the dynamic stall hysteresis loop to the reduced frequency and amplitude is well reproduced.

Validation of the unsteady aerodynamics model with OSU test data (in circles) of the S809 airfoil; top: varying mean AoA; bottom: varying dimensionless frequency — Fig. 125 Validation of the unsteady aerodynamics model with OSU test data 2 (in circles) of the S809 airfoil; top: varying mean AoA; bottom: varying dimensionless frequency.

1: Juliane Wendler, David Marten, George Pechlivanoglou, Christian Oliver Paschereit, and Christian Navid Nayeri. An Unsteady Aerodynamics Model for Lifting Line Free Vortex Wake Simulations of HAWT and VAWT in QBlade. In Proceedings of ASME Turbo Expo 2016: Turbomachinery Technical Conference and Exposition. 2016.
2: NREL. OSU Wind-Tunnel Test Data S809. 1999. URL: https://wind.nrel.gov/airfoils/OSU_data/data/ (visited on 2019-07-12).