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Content archived on 2024-04-19

Aerodynamic stall and 3D effects

Objective


The project results have lead to improvements in the capabilities of calculating the viscous flow around wind turbine blades. Separated 3D flow was, for some cases, well-predicted and certain aspects of dynamic stall were investigated. Still, Navier-Stokes solutions are shown to be highly sensitive to the choice of turbulence models. The 3D solutions were obtained with course grids and rather simplified boundary conditions. In order to increase the possibility of understanding of unsteady aerodynamics and 3D effects, both in general and for specific new designs, it is recommended that further work related to turbulence models for Navier-Stokes methods is done.
The objective of this research project is to create practically useful methods for the prediction of aerodynamic stall, both three-dimensional and time variable, for horizontal axis wind turbines (HAWT). The Concerted Action will bring together the HAWT aerodynamics research across Europe into a coherent form suitable for use by the blade designer. This recent research, much of it funded by the Commission, was designed to clarify the unsteady and three-dimensional aerodynamics characteristic of wind turbine rotors. In a brief and intensive programme of work, this project will draw together the essential observations from a number of measurement data sets and the insights from physically accurate flow field models, to provide well-defined engineering models of HAWT rotor stall aerodynamics. The uncertainties associated with presently-available aerodynamic performance and load predictions have inevitably led to the conservative over-design of various items of plant. The increased confidence provided by the analysis tools to be assembled within this project should enable the blade manufacturer to develop more cost-effective designs, leading ultimately to a reduction in the cost of energy.

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Coordinator

RISOE NATIONAL LABORATORY
EU contribution
No data
Address
Frederiksborgvej 399
ROSKILDE
Denmark

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Total cost

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Participants (11)

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