Stall in Yawed Flow Conditions: A Correlation of Blade Element Momentum Predictions With Experiments

Author:

Haans Wouter1,Sant Tonio2,van Kuik Gijs1,van Bussel Gerard1

Affiliation:

1. Faculty of Aerospace Engineering, Kluyverweg 1, Delft University of Technology, Delft, 2629 HS, The Netherlands

2. Faculty of Aerospace Engineering, Kluyverweg 1, Delft University of Technology, Delft, 2629 HS, The Netherlands and University of Malta, Msida, MDS 07, Malta

Abstract

Yawed flow conditions introduce unsteady loads in a wind turbine that affect generated power quality and fatigue life. An unsteady phenomenon of special concern is dynamic stall, due to the significant load fluctuations associated with it. Although the assumptions underlying blade element momentum (BEM) models are totally inadequate in yawed flow conditions, these models, modified with engineering models, are still widely used in industry. It is therefore relevant to assess the capabilities of BEM models in predicting the location of dynamic stall on the blade for a rotor in yawed flow conditions. A rotor model is placed in an open jet wind tunnel and tested in yawed flow conditions. The locations of dynamic stall on the blade of a rotor model as a function of the blade position are observed. Two experimental techniques are used; tufts glued to the blade and hot-film anemometry in the near wake. The results from the two techniques are compared and possible causes for differences are identified. Furthermore, the rotor model in yaw is modeled with a simple BEM model, utilizing a Gormont dynamic stall model. The regions of dynamic stall on the blades predicted by the BEM model are compared with the experimental results. The BEM model seems capable of a crude prediction of the dynamic stall locations found for the rotor model in yawed flow conditions.

Publisher

ASME International

Subject

Energy Engineering and Power Technology,Renewable Energy, Sustainability and the Environment

Reference17 articles.

1. Wind Turbine Wake Aerodynamics;Vermeer;Prog. Aerosp. Sci.

2. Challenges in Modelling the Unsteady Aerodynamics of Wind Turbines;Leishman;Wind Eng.

3. An Engineering Model for Yawed Conditions, Developed on Basis of Wind Tunnel Measurements, Aiaa-1999-0039;Schepers

4. Review of the Present Status of Rotor Aerodynamics;Snel;Wind Eng.

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