LDV Measurements Near a Vortex Shedding Strut Mounted in a Pipe

[+] Author and Article Information
T. T. Yeh, Baldwin Robertson

National Bureau of Standards, Washington, D.C. 20234

W. M. Mattar

The Foxboro Co., Foxboro, Mass.

J. Fluids Eng 105(2), 185-196 (Jun 01, 1983) (12 pages) doi:10.1115/1.3240963 History: Received June 04, 1982; Online October 26, 2009


The velocity field around vortex shedding strut mounted in a circular pipe has been in detail with a laser Doppler velocimeter (LDV) at a pipe Reynolds number equal to 90,000. The instantaneous velocity is decomposed into mean, periodic, and random components. Only the first two harmonics are large enough to be detected; the large-scale structure can be characterized by just these two these and the mean. Profiles of the different velocity terms are given upstream of, downstream of, and close to the strut. The two-dimensional velocity vector field of the mean flow on the transverse diametral plane of symmetry is presented along with its streamlines. Finally, for each spatial component, profiles of vortex visibility, the ratio of the energy of a periodic component to the total fluctuating energy in a narrow frequency band, are given.

Copyright © 1983 by ASME
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