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NEAR-WALL MEASUREMENTS OF TURBULENCE STATISTICS WITH LASER DOPPLER VELOCITY PROFILE SENSORS

K. Shirai
Dresden University of Technology (TU-Dresden) Department of Electrical Engineering and Information Technology Helmholtzstrafce 18, 01069 Dresden, Germany

Christian Bayer
Technische Universitat Dresden, Chair of Measurement and Testing Techniques, Department of Electrical Engineering and Information Technology, Helmholtzstrasse 18, 01069, Dresden, Germany

Andreas Voigt
Technische Universitat Dresden, Chair of Measurement and Testing Techniques, Department of Electrical Engineering and Information Technology, Helmholtzstrasse 18, 01069, Dresden, Germany

Thorsten Pfister
Dresden University of Technology (TU-Dresden) Department of Electrical Engineering and Information Technology Helmholtzstrafce 18, 01069 Dresden, Germany

Lars Buttner
Dresden University of Technology (TU-Dresden) Department of Electrical Engineering and Information Technology Helmholtzstrafce 18, 01069 Dresden, Germany

Jurgen Czarske
Dresden University of Technology (TU-Dresden) Department of Electrical Engineering and Information Technology Helmholtzstrafce 18, 01069 Dresden, Germany

Abstract

We report on the evaluation of the near-wall turbulence statistics in a fully developed channel flow. The measurement was conducted with laser Doppler velocity profile sensors. The sensor provides both the information of lateral velocity and axial position of individual tracer particles inside the measurement volume, which yields the velocity profile inside the measurement volume without being mechanically traversed. Hence, velocity measurement with a high spatial resolution up to micrometer resolution is achieved without strongly reducing the size of the measurement volume. The streamwise velocity was measured with two independent velocity profile sensor systems at three different Reynolds number conditions. The resulting turbulence statistics show a good agreement with available data of direct numerical simulations up to the fourth order moments. This demonstrates the velocity profile sensor to be one of the promising techniques for turbulent flow research with the advantage of a spatial resolution more than one order of magnitude higher than a conventional laser Doppler technique.