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A technique for phase speed measurements in turbulent flow

Published online by Cambridge University Press:  29 March 2006

G. R. Stegen  and
C. W. Van Atta
G. R. Stegen
Affiliation:
Department of Civil Engineering, Colorado State University, Fort Collins, Colorado
C. W. Van Atta
Affiliation:
Department of the Aerospace and Mechanical Engineering Sciences, University of California, San Diego, La Jolla, California
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Abstract

A technique is described for measuring the local phase speed in a turbulent flow. The technique has been used to measure the phase speed of the Fourier components of the longitudinal velocity fluctuations in grid turbulence. These measurements are unique in that the probe spacing is only twice the Kolmogoroff length scale. The velocity fluctuations were measured with linearized constant-temperature hot-wire anemometers, the outputs of which were digitally sampled and recorded in real time. Digital Fourier analysis techniques were then used to calculate the cross-spectral density of the two velocity measurements. From this, the phase, phase speed, and coherence were calculated. The coherence has been used to estimate the variance of these measurements.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 42 , Issue 4 , 30 July 1970 , pp. 689 - 699
Copyright
© 1970 Cambridge University Press

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