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Modeling and Simulation of a 3MW Wind Turbine Blade for Determination and Analysis of Flow Characteristics

This paper discusses the strategy for aerodynamic prediction and analysis of a 56m blade using Computational Fluid Dynamics (CFD) tools. The aim of this study is to simulate the flow field around a 3MW wind turbine blade in order to study the flow physics dominated by the three-dimensional effects. This blade incorporates flatback airfoils on the inboard region of the blade used to improve aerodynamic performance in the root region of the blade. In order to reduce computation time and complexity, only one third of the domain is modelled and a periodic boundary condition is imposed on the 120° periodic faces. A k-ω SST turbulence model is used as a solver for this simulation. Several features pertaining to 3D Flowfield behavior are captured and studied. A comparison is made to the results obtained from RANS to those obtained from BEM based methods. The flow past the flatback regions of the blade did not separate at the sharp edges of the flatback corners, as predicted by 2D simulation due to the presence of a dominant radial flow component in the spanwise direction which caused the flow to wrap around the trailing edge of the blade without corner separation. A shift in the angle of attack along the span of the blade is observed.