Abstract
Nine research teams organized a round-robin measurement campaign of the wake of two porous discs in a homogeneous and “low-turbulent’ flow. Mean streamwise velocity and turbulence intensity profiles at four diameters downstream of the discs were measured and compared through such metrics as the maximum of velocity deficit, the maximum of turbulence intensity, the wake width and the thrust coefficient. The dependence of these metrics on the inflow conditions (freestream turbulence intensity and Reynolds number based on the disc diameter) is discussed.
Highlights
Following the outcomes of the experts workshop organized by ForWind-Uni Oldenburg in 2018March 22-23 on Wind Energy Science & Wind Tunnel Experiments, it has been agreed to qualify the smallest wind turbine models as Wake-Generating Turbine models (WGT)
Mean streamwise velocity and turbulence intensity profiles at four diameters downstream of the discs were measured and compared through such metrics as the maximum of velocity deficit, the maximum of turbulence intensity, the wake width and the thrust coefficient. The dependence of these metrics on the inflow conditions is discussed
The Reynolds number based on the disc diameter ranges from 36 000 to 333 000, covering one decade
Summary
Following the outcomes of the experts workshop organized by ForWind-Uni Oldenburg in 2018. The limitations of small Reynolds numbers and geometrical simplifications result in the improper reproduction of the near flow (x/D < 3-4). Studies show that these small models are appropriate to model the far-wake properties [1, 2] and are acceptable, when studying the wake interactions at a wind farm scale [3, 4]. The homogeneous incoming flow properties are carefully documented and the wake properties are compared in terms of mean velocity and turbulence intensity profiles at four rotor diameters downstream of the porous discs. The comparison between the mean velocity profiles and the turbulence intensity profiles is discussed and discrepancies are interpreted through the analysis of the inflow condition properties (primarily Reynolds number and freestream turbulence intensity)
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