Regensburg 2019 – scientific programme

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DY: Fachverband Dynamik und Statistische Physik

DY 18: Fluid physics and turbulence

DY 18.4: Talk

Tuesday, April 2, 2019, 11:00–11:15, H20

Investigation of different transition phenomena on airfoils by means of infrared thermography and PIV — •Enno Bösenberg, Tom T. B. Wester, Dominik Traphan, Gerd Gülker, and Joachim Peinke — ForWind, Institute of Physics, University of Oldenburg, Oldenburg, Germany

In fluid dynamic research phenomena like laminar separation bubble and transition in the boundary layer are known to be sensitive to the inflow and can change the entire flow topology. Consequently, they can induce changes in loads increasing fatique of e.g. wind turbines.

Due to a thin boundary layer, the transition zone is difficult to observe. Best practice methods, like pressure taps or oil-film, require some form of preparation on airfoils.

Thermography has proven to be a quick and easy way of visualising aerodynamic effects on airfoils while requiring little to no preparation. Experiments have been made to identify the effects of transition, separation bubble and turbulent flow from thermal images of airfoils. Now we are comparing the high temporal and spatial resolution in flow measurement of particle image velocimetry (PIV) to the surface-bound measuring technique of thermography.

Varying wind velocities, during combined triggered PIV and high speed thermographic measurements, enable us to assess the spatial and temporal accuracy of said events in thermography. First results suggest a high correlation with PIV.