Two-point velocity measurements using LDA: spatial and temporal analysis in a turbulent boundary layer

G. P. Romano

doi:10.1117/12.150554

6 August 1993 Two-point velocity measurements using LDA: spatial and temporal analysis in a turbulent boundary layer

G. P. Romano

Proceedings Volume 2052, Fifth International Conference on Laser Anemometry: Advances and Applications; (1993) https://doi.org/10.1117/12.150554
Event: Laser Anemometry: Advances and Applications: Fifth International Conference, 1993, Koningshof, Veldhoven, Netherlands

Abstract

Two points velocity measurements in a fully developed turbulent duct flow are performed using LDA technique. Color separation is used to discriminate signals from close positions. High spatial (about 0.1 mm) and temporal (about 10^-3 s) resolutions are obtained by careful selection of optical and electronic parameters. The signals are analyzed using classical auto-correlation and power spectral functions, but also time cross-correlation, transfer and coherence functions. From time-space quantities, information on the evolution in a reference frame moving with the mean flow velocity can be derived and compared with Lagrangian correlation; the results agree at least over one integral time scale. Different Reynolds numbers are tested. Taylor and advection hypotheses are also investigated.

Citation Download Citation

G. P. Romano "Two-point velocity measurements using LDA: spatial and temporal analysis in a turbulent boundary layer", Proc. SPIE 2052, Fifth International Conference on Laser Anemometry: Advances and Applications, (6 August 1993); https://doi.org/10.1117/12.150554

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