Improving BEM-based Aerodynamic Models in Wind Turbine Design Codes
Abstract
Improving BEM-based Aerodynamic Models in Wind Turbine Design CodesThe wind energy industry is experiencing remarkable growths annually.Despite the great progress made, further cost reductions in turbine technology are necessary for wind energy to reach its full potential in terms of the large-scale supply of electricity.Improving the reliability of aerodynamic models embedded in the design software currently used in industry is indispensable to guarantee reductions in the cost of wind energy.Due to its relatively high computational efficiency compared to free-wake vortex methods and CFD, the Blade-Element-Momentum theory still forms the basis for many aerodynamic models.Yet various experimental campaigns have demonstrated that BEM-based design codes are not always sufficiently reliable for predicting the aerodynamic load distributions on the wind turbine blades.In this Doctoral thesis, a detailed investigation of the aerodynamics of wind turbines is described with the aim of providing a better understanding of the limitations of the BEM theory.This work identifies the importance to pursue turbine aerodynamics and modelling with an integrated approach, emphasising on the need to understand the local blade aerodynamics, inflow distribution as well as the geometry and vorticity distribution of the wake.To enable this approach, new analytical methodologies were developed which compensate for the limitations in experimental data.Guidelines are presented for developing improved…
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