Evaluation of the lifting line vortex model approximation for estimating the local blade flow fields in horizontal-axis wind turbines

Lifting line vortex models have been widely used to predict flow fields around wind turbine rotors. Such models are known to be deficient in modelling flow fields close to the blades due to the assumption that blade vorticity is concentrated on a line and consequently the influences of blade geometry are not well captured. The present study thoroughly assessed the errors arising from this approximation by prescribing the bound circulation as a boundary condition on the flow using a lifting line free-wake vortex approach. The bound circulation prescribed to free-wake vortex model was calculated from two independent sources using (1) experimental results from SPIV and (2) data generated from a 3D panel free-wake vortex approach, where the blade geometry is fully modelled. The axial and tangential flow fields around the blades from the lifting line vortex model were then compared with those directly produced by SPIV and the 3D panel model. The comparison was carried out for different radial locations across ...

[1]  Duck-Joo Lee,et al.  Numerical simulations of wake structure generated by rotating blades using a time marching, free vor , 1997 .

[2]  J. Westerweel.  Digital particle image velocimetry: theory and application , 1993 .

[3]  J. Gordon Leishman,et al.  A Generalized Model for Transitional Blade Tip Vortices , 2004 .

[4]  Spyros G. Voutsinas,et al.  STATE OF THE ART IN WIND TURBINE AERODYNAMICS AND AEROELASTICITY , 2006 .

[5]  Daniel Micallef,et al.  3D load estimation on a horizontal axis wind turbine using SPIV , 2014 .

[6]  Tonio Sant,et al.  Estimating the angle of attack from blade pressure measurements on the NREL phase VI rotor using a free wake vortex model: Axial conditions , 2006 .

[7]  Hester Bijl,et al.  Comparing different dynamic stall models , 2013 .

[8]  J. Sørensen,et al.  Wind turbine wake aerodynamics , 2003 .

[9]  H. Madsen,et al.  Review paper on wind turbine aerodynamics , 2011 .

[10]  F. Coton,et al.  A study on rotational effects and different stall delay models using a prescribed wake vortex scheme and NREL phase VI experiment data , 2008 .

[11]  J. Gordon Leishman,et al.  A Reynolds Number-Based Blade Tip Vortex Model , 2007 .

[12]  Daniel Micallef.  3D flows near a HAWT rotor: A dissection of blade and wake contributions , 2012 .

[13]  G. Bussel,et al.  Experimental and numerical investigation of tip vortex generation and evolution on horizontal axis wind turbines , 2016 .

[14]  Matthew A. Lackner,et al.  DEVELOPMENT OF A FREE VORTEX WAKE METHOD CODE FOR OFFSHORE FLOATING WIND TURBINES , 2012 .

[15]  C. Ferreira.  The near wake of the VAWT: 2D and 3D views of the VAWT aerodynamics , 2009 .

[16]  J. Gordon Leishman,et al.  Free-Vortex Filament Methods for the Analysis of Helicopter Rotor Wakes , 2002 .

[17]  Mümtaz Karataş.  A Multi Foci Closed Curve: Cassini Oval, its Properties and Applications = Çok Merkezli Kapalı Bir Eğri: Cassini Ovali, Özellikleri ve Uygulamaları , 2013 .

[18]  Carlos Simao Ferreira,et al.  An investigation of radial velocities for a horizontal axis wind turbine in axial and yawed flows , 2013 .

[19]  Herman Snel,et al.  Review of Aerodynamics for Wind Turbines , 2003 .