Dresden 2017 – scientific programme

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DY: Fachverband Dynamik und Statistische Physik

DY 33: Fluid Dynamics and Turbulence

DY 33.3: Talk

Wednesday, March 22, 2017, 10:30–10:45, ZEU 160

Generation of reproducible 2D atmospheric turbulence in a closed wind tunnel test section — •Johannes Krauß, Tom Wester, Michael Hölling, Joachim Peinke, and Gerd Gülker — ForWind - Center for Wind Energy Research, Institute of Physics, University of Oldenburg, Germany

Changes in the inflow conditions of wind turbines cause fatigue loads and they have an important influence on the turbines lifetime. Important aspects are variations of the angle of attack and gusts that lead to aerodynamic effects such as dynamic stall and sudden changing moments and forces.

We will present a technique which makes it possible to reproduce wind speed time series measured in the turbulent atmospheric boundary layer in a closed test section of a wind tunnel. With this technique, we can generate quasi-2D flows which mimic the real atmospheric inflow acting on an outside wind energy converter. The quasi-2D properties of the wind flow are meant to enable its usage for flow analysis at airfoil segments and to simplify the identification of complex aerodynamic phenomena. The technique is based on independently moving vanes affecting the laminar inflow of the wind tunnel in a controllable and reproducible manner. For flow modulation, different situations are modelled and characterized. To capture the entire temporal and spatial dynamic of the system high speed PIV and hotwire measurements are used. In this presentation, first measurements and conclusions are shown.