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Highly spatially resolved velocity measurements of a turbulent channel flow by a fiber-optic heterodyne laser-Doppler velocity-profile sensor

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Abstract

Velocity measurements with a high spatial resolution are important in turbulent flow research. In this paper, we report on the development of a new fiber-optic laser-Doppler velocity-profile sensor exhibiting a spatial resolution of up to 5 μm and its application to turbulent boundary layers. The sensor developed in the present work employs a frequency-division-multiplexing technique in order to separate two measurement signals from the two fringe systems. Velocity measurements close to zero at the solid wall were realized using heterodyne technique. The use of fiber optics improved a robustness of the sensor. The measurement accuracy of the sensor was experimentally investigated with respect to the spatial resolution and velocity. Universal velocity profile of a turbulent flow was obtained in a fully developed channel flow. Mean and fluctuating velocity are presented with a high spatial resolution.

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Acknowledgment

The authors appreciate Mr. P. Pfeiffer for his dedicated work on development of the sensor. The support from DFG (CZ55/9-3) is acknowledged.

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Authors and Affiliations

  1. Department of Electrical Engineering and Information Technology, Chair for Measurement and Testing Techniques, Dresden University of Technology (TU Dresden), Helmholtzstraße 18, 01069, Dresden, Germany

    K. Shirai, T. Pfister, L. Büttner & J. Czarske

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

    H. Müller

  3. Institute of Fluid Mechanics (LSTM), Friedrich-Alexander-University Erlangen-Nürnberg, Cauerstr. 4, 91058, Erlangen, Germany

    S. Becker, H. Lienhart & F. Durst

Authors
  1. K. Shirai
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  2. T. Pfister
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  3. L. Büttner
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  4. J. Czarske
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  5. H. Müller
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  6. S. Becker
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  7. H. Lienhart
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  8. F. Durst
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Correspondence to K. Shirai.

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Shirai, K., Pfister, T., Büttner, L. et al. Highly spatially resolved velocity measurements of a turbulent channel flow by a fiber-optic heterodyne laser-Doppler velocity-profile sensor. Exp Fluids 40, 473–481 (2006). https://doi.org/10.1007/s00348-005-0088-3

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  • DOI: https://doi.org/10.1007/s00348-005-0088-3

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