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HIGH SPATIALLY RESOLVED TURBULENT BOUNDARY LAYER MEASUREMENTS BY FIBER-OPTIC HETERODYNE-VELOCITY-PROFILE-SENSOR

K. Shirai
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

Thorsten Pfister
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

H. Muller
Physikalisch-Technische Bundesanstalt Braunschweig (PTB) Department 1.4 Gas Flow Bundesallee 100, 38116 Braunschweig, Germany

D. Dopheide
Physikalisch-Technische Bundesanstalt Braunschweig (PTB) Department 1.4 Gas Flow Bundesallee 100, 38116 Braunschweig, Germany

Stefan Becker
Institute of Process Machinery and System Engineering (iPAT), Friedrich-Alexander University, D-91058 Erlangen, Deutschland

Hermann Lienhart
Institute of Fluid Mechanics (LSTM) Friedrich-Alexander University Erlangen-Nuremberg, Cauerstr. 4 D-91058 Erlangen-Nuremberg, Germany

Franz Durst
FMP TECHNOLOGY GMBH, Am Weichselgarten 34, 91058 Erlangen, Germany

Abstract

A fiber-optic LDA-velocity-profile-sensor was realized for high spatially resolved velocity measurements in turbulent boundary layers. The sensor can resolve the position of a tracer particle passing through the measurement volume along optical axis. Therefore velocity measurement with a high spatial resolution is possible compared with a conventional LDA (laser Doppler anemometry). The measurement accuracy of the sensor was investigated with respect to the velocity measurement and the spatial resolution. The sensor successfully resolved the velocity distribution in a laminar boundary layer on a flat plate. Then it was applied to turbulent boundary layers in a fully developed duct flow. The measured results showed fairly good agreement with a direct numerical-simulation result. However, the improvements are necessary for obtaining reliable statistics.