The impact of yaw error on aeroelastic characteristics of a horizontal axis wind turbine blade |
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| Affiliation: | 1. School of Mechanical Aerospace and System Engineering, Korea Advanced Institute of Science and Technology, Daejeon 305-701, Republic of Korea;2. Maritime Research Institute, R&D Division Structure Research Department, Hyundai Heavy Industries Co., Ltd., Ulsan 682-792, Republic of Korea;3. Center of Aerospace Structures and Department of Aerospace Engineering Sciences, University of Colorado, Boulder, CO 80309-409, United States;4. Division of Ocean Systems Engineering, Korea Advanced Institute of Science and Technology, Daejeon 305-701, Republic of Korea;1. Center of Excellence in Design, Robotics & Automation, Department of Mechanical Engineering, Sharif University of Technology, Po. Box: 11155-9567, Tehran, Iran;2. Department of Aerospace Engineering, Sharif University of Technology, Tehran, Iran;1. Key Laboratory of Condition Monitoring and Control for Power Plant Equipment, North China Electric Power University, Beijing 102206, PR China;2. Electric Power Research Institute, Yunnan Electric Power Test & Research Institute(Group), Kunming 650217, PR China;1. College of Energy and Mechanical Engineering, Shanghai University of Electric Power, Shanghai 200090, PR China;2. School of Computing, Engineering and Mathematics, University of Western Sydney, Sydney 2751, Australia;3. Department of Engineering Technology and Construction Management, University of North Carolina at Charlotte, NC 28223, USA;1. Computational Fluid Dynamics Laboratory, School of Engineering, University of Liverpool, Harrison Hughes Building, Liverpool L69 3GH, UK;2. National Renewable Energy Center of Spain, Ciudad de la Innovacion, 31621 Sarriguren (Navarra), Spain;1. Composites Research Laboratory, Faculty of New Sciences and Technologies, University of Tehran, Tehran, Iran;2. Faculty of New Sciences and Technologies, University of Tehran, Tehran, Iran;1. Body Durability CAE Team, Research and Development Division, Hyundai Motor, Hwaseong 445-705, Republic of Korea;2. Launch Complex Team, KSLV-II R&D Program Executive Office, Korea Aerospace Research Institute, Daejeon 305-806, Republic of Korea;3. Division of Aerospace Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 305-701, Republic of Korea;4. Maritime Research Institute, R&D Division Structure Research Department, Hyundai Heavy Industries Co., Ltd., Ulsan 682-792, Republic of Korea |
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| Abstract: | Horizontal axis wind turbines operate under yawed conditions for a considerable period of time due to the power control mechanism or sudden changes in the wind direction. This in turn can alter the dynamic characteristics of a turbine blade because the flow over the rotor plane may trigger complicated induced velocity patterns. In this study, an aeroelastic analysis under yawed flow conditions is carried out to investigate the effects of yaw error on the blade behaviors and dynamic stability. A beam model including geometric nonlinearity coupled with unsteady aerodynamics based on a free-vortex wake method with the blade element theory is employed in the present study. The aerodynamic approach for a horizontal axis wind turbine blade under yawed flow conditions is verified through comparison with measurements. It is also shown that the present method gives slightly better results at high yaw angles than does the method previously published in the literature. The dynamic instabilities of a National Renewable Energy Laboratory 5 MW reference wind turbine have subsequently been investigated for various wind speeds and yaw angles. Observations are made that yaw effects induce considerable changes in airloads and blade structural behavior. Also, the aeroelastic damping values for this particular blade under yawed flow conditions can be reduced by up to approximately 33% in the worst case. Therefore, it is concluded that the impacts of yaw misalignments adversely influenced the dynamic aeroelastic stability of the horizontal axis wind turbine blade. |
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| Keywords: | Aeroelasticity Blade element method Free-vortex wake method Stability Wind turbine Yaw effects |
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