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

Katsuaki Shirai, T. Pfister, L. Büttner, J. Czarske, H. Müller, S. Becker, H. Lienhart, F. Durst

Research output: Contribution to journalArticle

22 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)473-481
Number of pages9
JournalExperiments in Fluids
Volume40
Issue number3
DOIs
Publication statusPublished - 2006 Mar
Externally publishedYes

Fingerprint

channel flow
Channel flow
velocity measurement
Velocity measurement
Fiber optics
fiber optics
velocity distribution
spatial resolution
Lasers
sensors
Sensors
turbulent flow
Turbulent flow
lasers
signal measurement
Frequency division multiplexing
frequency division multiplexing
high resolution
turbulent boundary layer
Boundary layers

ASJC Scopus subject areas

  • Computational Mechanics
  • Mechanics of Materials
  • Physics and Astronomy(all)
  • Fluid Flow and Transfer Processes

Cite this

Highly spatially resolved velocity measurements of a turbulent channel flow by a fiber-optic heterodyne laser-Doppler velocity-profile sensor. / Shirai, Katsuaki; Pfister, T.; Büttner, L.; Czarske, J.; Müller, H.; Becker, S.; Lienhart, H.; Durst, F.

In: Experiments in Fluids, Vol. 40, No. 3, 03.2006, p. 473-481.

Research output: Contribution to journalArticle

Shirai, Katsuaki ; Pfister, T. ; Büttner, L. ; Czarske, J. ; Müller, H. ; Becker, S. ; Lienhart, H. ; Durst, F. / Highly spatially resolved velocity measurements of a turbulent channel flow by a fiber-optic heterodyne laser-Doppler velocity-profile sensor. In: Experiments in Fluids. 2006 ; Vol. 40, No. 3. pp. 473-481.
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