Berlin 2012 – scientific programme

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DY: Fachverband Dynamik und Statistische Physik

DY 22: Posters I

DY 22.26: Poster

Wednesday, March 28, 2012, 17:00–19:00, Poster A

New anemometers for turbulent flow measurements on different scales — •Hendrik Heißelmann, Jaroslaw Puczylowski, Michael Hölling, and Joachim Peinke — ForWind - Center for Wind Energy Research, Institute of Physics, University of Oldenburg

Experimental investigations of turbulent flows are an essential tool for the characterization of turbulence and the validation of simulations. Therefore, highly resolving and robust sensors are needed for different length scales.

We present two new drag-based sensors developed at the University of Oldenburg, which make use of the laser pointer principle also known from atomic force microscopy. This technique allows for the detection of small displacements of a sphere in case of the sphere anemometer and the deflection of a tiny cantilever in case of the 2D Laser-Cantilever-Anemometer (2D LCA), respectively.

The 2D LCA was developed for measurements on small scales of turbulent flows in two dimensions with high temporal resolution comparable x-wire anemometry. We present data acquired with a cantilever on the scale of 35 µm × 140 µm (width × length) in turbulent laboratory flows and compare it to data from a commercial x-wire anemometer.

As an alternative to standard sensors for wind energy applications, the new sphere anemometer was designed for the simultaneous two dimensional measurement of turbulent atmospheric flows on a spatial scale of several cm. In our contribution, comparative measurements in turbulent flows performed with sphere anemometer, cup anemometer and sonic anemometers will be presented.