Berlin 2015 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 32: Focus Session: Statistics of fully developed turbulence
DY 32.5: Vortrag
Mittwoch, 18. März 2015, 16:15–16:30, BH-N 243
Stochastic analysis of aerodynamic forces acting on airfoils in turbulent inflow — •Gerrit Kampers1, Michael Hölling1, Ulrike Cordes2, Klaus Hufnagel2, Cameron Tropea2, and Joachim Peinke1 — 1ForWind, Institute of Physics, University of Oldenburg, 26111 Oldenburg, Germany — 2Institute of Fluid Mechanics and Aerodynamics, Technical University of Darmstadt, 64287 Darmstadt, Germany
Wind turbines work within the atmospheric boundary layer, which is dominated by turbulence. Such turbulent flows feature non-Gaussian statistics, that are currently not accounted for by industry standards. These intermittent statistics lead to heavy fluctuations in aerodynamic forces and mechanical loads, respectively. Active and passive flow control elements represent a promising approach for the reduction of fluctuating loads.
We present a new testing method for wind tunnel experiments, that allows an investigation of the force fluctuations on airfoil segments with and without flow control elements under realistic and reproducible conditions. The statistics of the desired inflow are defined by a scale dependent analysis of offshore wind data and then reproduced in the wind tunnel with an active grid. Aerodynamic quantities of interest are measured and subsequently studied using a stochastic Langevin approach, which separates the deterministic response of a system from its stochastic (noisy) part. This method enables for a quantitative analysis of the dynamical performance of flow control mechanisms in turbulent conditions.