Similarity of wake meandering for different wind turbine designs for different scales

Foti, Daniel; Yang, Xiaolei; Sotiropoulos, Fotis

doi:10.1017/jfm.2018.9

Title: Similarity of wake meandering for different wind turbine designs for different scales

Journal Article · Tue Mar 06 00:00:00 EST 2018 · Journal of Fluid Mechanics

DOI:https://doi.org/10.1017/jfm.2018.9· OSTI ID:1538920

Foti, Daniel; Yang, Xiaolei;

The wake meandering characteristics of four different wind turbine designs with diameters ranging from a few centimetres (wind tunnel scale) to a hundred metres (utility scale) are investigated using large-eddy simulation with the turbine blades and nacelle parametrised using a new actuator surface model. Different velocity fields and meandering behaviours are observed at near-wake locations. At far-wake locations, on the other hand, the mean velocity deficit profiles begin to collapse when scaled by the centreline velocity deficit based on the incoming wind speed at turbine hub height, suggesting far-wake similarity across scales. The turbine-added turbulence kinetic energy profiles are shown to also nearly collapse with each other in the far wake when normalised using a velocity scale defined by the thrust on the turbine rotor. Moreover, we show that at far-wake locations, the simulated flow fields for all four turbine designs exhibit similar wake meandering characteristics in terms of (1) a Strouhal number independent of rotor designs of different sizes and (2) the distributions of wake meandering wavelengths and amplitudes when normalised by the rotor diameter and a length scale defined by the turbine thrust respectively.

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Research Organization:: Univ. of Minnesota, Minneapolis, MN (United States); Lockheed Martin Corporation, Littleton, CO (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE)

DOE Contract Number:: EE0002980; EE0005482; AC04-94AL85000

OSTI ID:: 1538920

Journal Information:: Journal of Fluid Mechanics, Vol. 842; ISSN 0022-1120

Publisher:: Cambridge University Press

Country of Publication:: United States

Language:: English

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