Dresden 2009 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 12: Poster I

DY 12.13: Poster

Dienstag, 24. März 2009, 14:30–16:30, P1A

New anemometers for atmospheric and laboratory turbulent flows — •Jaroslaw Puczylowsk, Hendrik Heißelmann, Michael Hölling, and Joachim Peinke — ForWind - Center for Wind Energy Research, University of Oldenburg, Oldenburg, Germany

We present setups and measurement results of new anemometers, the 2D-Laser-Cantilever-Anemometer and the sphere anemometer.

Compared to cup-anemometers the sphere anemometer is a robust sensor for simultaneous detection of wind speed and direction with a high spatial and temporal resolution. The drag force raised by air flow acts upon a sphere resulting in a deflection of the supporting pipe. Using the technology of atomic force microscopes deflections in micrometer range can be detected. Via calibration the corresponding flow velocity in two dimensions can be obtained.

The 2D-Laser-Cantilever-Anemometer is equipped with a cantilever measuring the dimensions of few ten micrometers. Small deflections of the cantilever due to flow can be detected by means of the laser pointer principle. In view of the bending and twisting behavior of the cantilever, longitudinal and transversal velocity components can be measured at the same time. A two-dimensional PSD element is used to determine the position of the reflecting laser spot. The 2D-Laser-Cantilever-Anemometer allows measurements with a spatial and temporal resolution comparable to x-wire-anemometry.

The working principle of both anemometers is similar. The sphere anemometer is applicable for measuring atmospherical flows, the 2D-Laser-Cantilever-Anemometer can be used for flows on smaller scales.