A hybrid actuator disc – Full rotor CFD methodology for modelling the effects of wind turbine wake interactions on performance |
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| Affiliation: | 1. WindNet, The University of Sheffield, UK;2. Department of Mechanical Engineering, The University of Sheffield, Mappin Street, Sheffield, S1 3JD, UK;3. Department of Town & Regional Planning, The University of Sheffield, Western Bank, Sheffield, S10 2TN, UK;4. Institute of High Performance Computing, Fusionopolis, 1 Fusionopolis Way, #16-16 Connexis, 138632, Singapore;1. Fluid Mechanics Section, Department of Wind Energy, Technical University of Denmark, 2800, Lyngby, Denmark;2. Centre for Offshore Renewable Energy Engineering, Cranfield University, Cranfield, Bedfordshire, MK43 0AL, UK;3. Department of Mechanical Engineering, Johns Hopkins University, Baltimore, MD, 21218, USA;1. Dept. of Aerodynamics Wind Energy Flight Performance and Propulsion, Delft University of Technology, Delft, 2629 HS, The Netherlands;2. Dept. of Mechanical Engineering & Center for Environmental and Applied Fluid Mechanics, Johns Hopkins University, Baltimore, MD, 21218, USA;3. Dept. of Wind Energy, Technical University of Denmark, 2800, Kongens Lyngby, Denmark;4. Dept. of Physics, Mesa+ Institute, and J. M. Burgers Centre for Fluid Dynamics, University of Twente, 7500 AE, Enschede, The Netherlands;5. Energy Research Centre of the Netherlands (ECN), 1755 ZG, Petten, The Netherlands;6. Dept. of Mechanical Engineering, Katholieke Universiteit Leuven, Celestijnenlaan 300 A, B3001, Leuven, Belgium;1. Department of Energy Systems, Mechanical Eng. Faculty, K. N. Toosi University of Technology, Tehran, Iran;2. Department of Mechanical Engineering, Amirkabir University of Technology, Tehran, Iran |
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| Abstract: | The performance of individual wind turbines is crucial for maximum energy yield, however, their performance is often reduced when turbines are placed together in an array. The wake produced by the rotors interacts with downstream turbines, resulting in a reduction in power output. In this paper, we demonstrate a new and faster modelling technique which combines actuator disc theory, modelled using wind tunnel validated Computational Fluid Dynamics (CFD), and integrated into full rotor CFD simulations. This novel hybrid of techniques results in the ability to analyse performance when simulating various array layouts more rapidly and accurately than using either method on its own.It is shown that there is a significant power reduction from a downstream turbine that is subjected to the wake of an upstream turbine, and that this is due to both a reduction in power in the wind and also due to changes in the aerodynamics. Analysis of static pressure along the blade showed that as a result of wake interactions, a large reduction in the suction peak along the leading edge reduced the lift generated by the rotor and so reduced the torque production and the ability for the blade to extract energy from the wind. |
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| Keywords: | Wind turbine wake interactions Wind turbine array performance Computational fluid dynamics Actuator disc Wind tunnel test Hybrid simulation technique |
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