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Coherent Structure of the Turbulent Boundary Layer at Low and High Velocities PUBLIC ACCESS

[+] Author Affiliations
V. Zakkay

New York University, New York, NY

V. Barra

Exxon Research and Engineering Co.

Paper No. 82-GT-78, pp. V001T01A033; 14 pages
doi:10.1115/82-GT-78
From:
  • ASME 1982 International Gas Turbine Conference and Exhibit
  • Volume 1: Turbomachinery
  • London, England, April 18–22, 1982
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-7956-6
  • Copyright © 1982 by ASME

abstract

An attempt to obtain a description of the coherent, or quasi-ordered structure of the turbulent boundary layer in the lateral direction at low and high velocity is presented in this paper. Simultaneous measurements of velocity, wall pressure and wall shear fluctuations at U = 10, 22.4 and 206 m/sec have been analyzed to obtain a description of the so-called “turbulent burst.” A conditional sampling scheme has been applied to the digitized fluctuations to identify the occurrence of bursts, and their spread thereof in the lateral direction. The results for the lateral spread of the “bursts” indicate that the events can be separated into two groups with opposite phase relationship across the lateral measurements and is thought to be an indication of “arrow-head” or “horseshoe” type shape. The angular spread of the “horseshoe” may be estimated and therefore the angle of each “leg” which makes the x axis may be determined. These results lead to the conclusions that the flow structures at high velocities tend to be very narrow and swept back at, or near the wall and are much wider and flatter away from the wall.

Copyright © 1982 by ASME
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