Wind Turbine Wake Interactions Research Papers (original) (raw)
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Turbulence structure in the wake behind a full-scale horizontal-axis wind turbine under the influence of real-time atmospheric inflow conditions has been investigated using actuator-line-model based large-eddy-simulations. Precursor... more
Turbulence structure in the wake behind a full-scale horizontal-axis wind turbine
under the influence of real-time atmospheric inflow conditions has been investigated using
actuator-line-model based large-eddy-simulations. Precursor atmospheric boundary layer
(ABL) simulations have been performed to obtain mean and turbulence states of the
atmosphere under stable stratification subjected to two different cooling rates. Wind
turbine simulations have revealed that, in addition to wind shear and ABL turbulence,
height-varying wind angle and low-level jets are ABL metrics that influence the structure
of the turbine wake. Increasing stability results in shallower boundary layers with stronger
wind shear, steeper vertical wind angle gradients, lower turbulence, and suppressed vertical
motions. A turbulent mixing layer forms downstream of the wind turbines, the strength and
size of which decreases with increasing stability. Height dependent wind angle and
turbulence are the ABL metrics influencing the lateral wake expansion. Further, ABL
metrics strongly impact the evolution of tip and root vortices formed behind the rotor.
Two factors play an important role in wake meandering: tip vortex merging due to the
mutual inductance form of instability and the corresponding instability of the turbulent
mixing layer