Performance and wake development behind two in-line and offset model wind turbines - "Blind test" experiments and calculations
Journal article, Peer reviewed
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http://hdl.handle.net/11250/2386749Utgivelsesdato
2014Metadata
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Sammendrag
This is a report on data presented at the ”Blind test 3” Workshop organized
jointly by Nowitech and Norcowe in Bergen, December 2013. A number of research
groups were invited to predict the performances and the wake development behind
two model wind turbines that have been extensively tested at the Department of
Energy and Process Engineering, NTNU. The turbines were arranged in-line, but
slightly offset so that the wake of the upstream turbine only affected roughly half the
area swept by the second rotor. This is a common event in most wind parks and
produces flow fields that are both complicated and harmful for the downstream
turbine. Contributions were received from five different groups using a range of
methods, from fully resolved Reynolds averaged Computational Fluid Dynamics
(CFD) models to Large Eddy Simulations (LES). The range of results was large but
the overall trend is that the current methods predict the power generation as well as the
thrust force reasonably well. But there is a large uncertainty in the prediction of the
turbulence field in the wake.