We report Lagrangian measurements obtained with an acoustic Doppler velocimetry technique. From the Doppler frequency shift of acoustic waves scattered by tracer particles in a turbulent flow, we are able to measure the full three-component velocity of the particles. As a first application, we have studied velocity statistics of Lagrangian tracers in a turbulent air jet at Rλ∼320 and at various distances from the nozzle. The choice of an air jet is motivated by the fact that jets produce a well characterized high level tubulence and open air flows are well suited to simultaneaously achieve classical hot wire Eulerian measurements. Therefore, we are also able to explicitly address the question of the differences between Eulerian and Lagrangian statistics. As Lagrangian tracers we use soap bubbles inflated with Helium which are neutrally buoyant in air and can be assimilated to fluid particles. Velocity statistics are analysed. We show that the Lagrangian autocorrelation decays faster in time than its Eulerian counterpart. Finally we present Lagrangian time velocity increments statistics which, as already reported by previous work, exhibits stronger intermittency than Eulerian velocity increments.
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ASME 2006 2nd Joint U.S.-European Fluids Engineering Summer Meeting Collocated With the 14th International Conference on Nuclear Engineering
July 17–20, 2006
Miami, Florida, USA
Conference Sponsors:
- Fluids Engineering Division
ISBN:
0-7918-4750-0
PROCEEDINGS PAPER
3D Acoustic Lagrangian Velocimetry Available to Purchase
A. Cartellier,
A. Cartellier
LEGI-UMR, Grenoble Cedex, France
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Y. Gagne
Y. Gagne
LEGI-UMR, Grenoble Cedex, France
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M. Bourgoin
LEGI-UMR, Grenoble Cedex, France
C. Baudet
LEGI-UMR, Grenoble Cedex, France
A. Cartellier
LEGI-UMR, Grenoble Cedex, France
P. Gervais
LEGI-UMR, Grenoble Cedex, France
Y. Gagne
LEGI-UMR, Grenoble Cedex, France
Paper No:
FEDSM2006-98210, pp. 1691-1701; 11 pages
Published Online:
September 5, 2008
Citation
Bourgoin, M, Baudet, C, Cartellier, A, Gervais, P, & Gagne, Y. "3D Acoustic Lagrangian Velocimetry." Proceedings of the ASME 2006 2nd Joint U.S.-European Fluids Engineering Summer Meeting Collocated With the 14th International Conference on Nuclear Engineering. Volume 1: Symposia, Parts A and B. Miami, Florida, USA. July 17–20, 2006. pp. 1691-1701. ASME. https://doi.org/10.1115/FEDSM2006-98210
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