Enhancement of Free Vortex Filament Method for Aerodynamic Loads on Rotor Blades

Abstract

The aerodynamics of a wind turbine is governed by the flow around the rotor

Semi-Analytical Tip Vortex Model for Fast Prediction of Contrarotating Open Rotor Noise

“…The helix is treated as a vortex filament that generates an induced velocity field, u ind;k . This filament is discretized into small straight-line vortex segments having constant circulation Γ, and the induced velocity at a given point is evaluated numerically by means of the Biot-Savart law [45,49] applied to each segment [50]:…”

“…In Eq. (15), r A and r B are the vectors connecting the segment extrema with the evaluation point (see [50]). A form for the correction factor K v must be defined to model the effect of a viscous core with finite radial extent.…”

Performances and Stall Delays of Three Dimensional Wind Turbine Blade Plate-Models with Helicopter-Like Propeller Blade Tips

“…The lift calculation could be executed employing a) Fourier method or b) simplified method with different approaches. A vortex filament method for aerodynamic load calculations have been developed on rotor blades (Abedi, 2013).…”

Periodic controllers for vibration reduction using actively twisted blades

“…In particular, linear inflow models are known to under-estimate the harmonic content of the forces. Computational Fluid Dynamics (CFD) is usually used to solve the aerodynamic field of every single blade, while the induced velocity is computed through potential methods, such as the prescribed or free-wake method (24) . However, we strive to avoid computationally intense tasks, such those arising from CFD simulations, because we need to simulate several seconds of flight to validate the controllers.…”