Berlin 2015 – scientific programme

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DY: Fachverband Dynamik und Statistische Physik

DY 32: Focus Session: Statistics of fully developed turbulence

DY 32.12: Talk

Wednesday, March 18, 2015, 18:30–18:45, BH-N 243

2d-LCA - a new highly resolving anemometer — •Jaroslaw Puczylowski, Michael Hölling, and Joachim Peinke — University of Oldenburg / ForWind - Center for Wind Energy Research, Oldenburg, Germany

The 2d-Laser Cantilever Anemometer (2d-LCA) is a recently developed sensor for two-dimensional velocity measurements in fluids. It uses a mico-structured cantilever as a sensing element, which allows for extremely high resolved measurements. Hence, spatial structures of 140micrometer can be resolved at temporal resolutions of about 100kHz. The 2d-LCA can be applied in the same way as commercial x-wires, however, it can also be used in particle-laden flows and liquids. In addition, the angular acceptance range of the 2d-LCA comprises 90°, whereas standard x-wires are limited to 45°. Comparative measurements with the 2d-LCA and an x-wire have been carried out in a laboratory-generated turbulent wake flow. The data sets of both measurement techniques were analyzed using same stochastic methods. These include spectral analyses, inspection of velocity increments and analyses of extended self-similarity (ESS). Furthermore, key parameters, such as characteristic lengths, mean values of velocity and angles of attack were determined from both data sets. The evaluation shows great agreement between both anemometers. Therefore, we are able to show that the 2d-LCA is capable of providing data that is consistent with established sensors and theory.