Regensburg 2016 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 57: Focus Session: Turbulence - From Pattern Formation to Stochastic Disorder

DY 57.7: Vortrag

Donnerstag, 10. März 2016, 17:00–17:15, H46

Reproducibility of turbulent flows in wind tunnel experiments using different active grids — •Lars Kröger, Joachim Peinke, and Gerd Gülker — ForWind, Center for Wind Energy Research, University of Oldenburg, 26129 Oldenburg, Germany

As wind turbines are mainly working inside the turbulent atmospheric boundary layer, the performance of the turbine and resulting structural loads are strongly influenced by the dominating highly intermittent wind fields. Regarding the chaotic nature of turbulence, reproducible measurements in situ are quite difficult and wind tunnel experiments with reproducible and controllable turbulent inflow conditions are of increasing importance. Here we present an active grid with which customized turbulence can be generated in wind tunnel applications. Experiments have shown that it is already possible to replicate atmospheric like turbulence regarding specific statistical properties as intermittency, turbulence intensity or integral length. In this contribution results from hotwire measurements behind two active grids in two wind tunnels of different dimensions are presented. The aim is to determine which requirements are necessary to reproduce the same downstream turbulence behind the different grids as accurately as possible.