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@article{b3e634b6905e44ebbba3017419900a1b,
title = "Aerodynamic optimization of wind turbine rotors using a blade element momentum method with corrections for wake rotation and expansion",
keywords = "Energy, Engineering, Wind turbine, Aerodynamics, Optimization, Blade element momentum method, Wake expansion, Wake rotation, Aerodynamiske designmetoder",
publisher = "John/Wiley & Sons Ltd.",
author = "Mads Døssing and {Aagaard Madsen}, Helge and Christian Bak",
year = "2012",
doi = "10.1002/we.487",
volume = "15",
number = "4",
pages = "563--574",
journal = "Wind Energy",
issn = "1095-4244",

}

RIS

TY - JOUR

T1 - Aerodynamic optimization of wind turbine rotors using a blade element momentum method with corrections for wake rotation and expansion

A1 - Døssing,Mads

A1 - Aagaard Madsen,Helge

A1 - Bak,Christian

AU - Døssing,Mads

AU - Aagaard Madsen,Helge

AU - Bak,Christian

PB - John/Wiley & Sons Ltd.

PY - 2012

Y1 - 2012

N2 - The blade element momentum (BEM) method is widely used for calculating the quasi-steady aerodynamics of horizontal axis wind turbines. Recently, the BEM method has been expanded to include corrections for wake expansion and the pressure due to wake rotation (), and more accurate solutions can now be obtained in the blade root and tip sections. It is expected that this will lead to small changes in optimum blade designs. In this work, has been implemented, and the spanwise load distribution has been optimized to find the highest possible power production. For comparison, optimizations have been carried out using BEM as well. Validation of shows good agreement with the flow calculated using an advanced actuator disk method. The maximum power was found at a tip speed ratio of 7 using , and this is lower than the optimum tip speed ratio of 8 found for BEM. The difference is primarily caused by the positive effect of wake rotation, which locally causes the efficiency to exceed the Betz limit. Wake expansion has a negative effect, which is most important at high tip speed ratios. It was further found that by using , it is possible to obtain a 5% reduction in flap bending moment when compared with BEM. In short, allows fast aerodynamic calculations and optimizations with a much higher degree of accuracy than the traditional BEM model. Copyright © 2011 John Wiley & Sons, Ltd.

AB - The blade element momentum (BEM) method is widely used for calculating the quasi-steady aerodynamics of horizontal axis wind turbines. Recently, the BEM method has been expanded to include corrections for wake expansion and the pressure due to wake rotation (), and more accurate solutions can now be obtained in the blade root and tip sections. It is expected that this will lead to small changes in optimum blade designs. In this work, has been implemented, and the spanwise load distribution has been optimized to find the highest possible power production. For comparison, optimizations have been carried out using BEM as well. Validation of shows good agreement with the flow calculated using an advanced actuator disk method. The maximum power was found at a tip speed ratio of 7 using , and this is lower than the optimum tip speed ratio of 8 found for BEM. The difference is primarily caused by the positive effect of wake rotation, which locally causes the efficiency to exceed the Betz limit. Wake expansion has a negative effect, which is most important at high tip speed ratios. It was further found that by using , it is possible to obtain a 5% reduction in flap bending moment when compared with BEM. In short, allows fast aerodynamic calculations and optimizations with a much higher degree of accuracy than the traditional BEM model. Copyright © 2011 John Wiley & Sons, Ltd.

KW - Energy

KW - Engineering

KW - Wind turbine

KW - Aerodynamics

KW - Optimization

KW - Blade element momentum method

KW - Wake expansion

KW - Wake rotation

KW - Aerodynamiske designmetoder

U2 - 10.1002/we.487

DO - 10.1002/we.487

JO - Wind Energy

JF - Wind Energy

SN - 1095-4244

IS - 4

VL - 15

SP - 563

EP - 574

ER -