Torsional Aeroelasticity of a Flexible VAWT Blade using a Combined Aerodynamic Method by Considering Post-stall and Local Reynolds Regime

The present research investigates the torsional aeroelasticity of the blade of an H-type vertical axis wind turbine subject to stall and post-stall conditions in various Reynolds regimes, which is experienced by the blade in a full revolution. In order to simulate the aerodynamics, a new model based on a combination of the Double Multi Streamtubes (DMST) model and the nonlinear multi-criteria Cl-α equations, which is depended on the local Reynolds number of the flow, has been proposed. The results indicate that using of multicriteria function dependent on the Reynolds number for the Cl-α curve has improved the prediction of the torsional behavior of the blade in azimuthal rotation of the blade compared to using singlecriterion functions and linear aerodynamics. The blade’s aeroelastic torsion has been studied for various TSR values.