Approach of turbulent boundary layer to similarity
Date
1968-09
Authors
Zoric, Dusan Leopold, author
Fluid Dynamics and Diffusion Laboratory, College of Engineering, Colorado State University, publisher
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Journal ISSN
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Abstract
A large scale turbulent boundary layer with no pressure gradient, developed on a flat plate 95 feet long has been investigated. Theoretical considerations of the existence of local similarity yield the requirements which should be found in the turbulent boundary layers in order that similarity exists. Measurements of the mean motion, the turbulent velocity components and the turbulent shear stress have been made for the free stream velocity range 60 to 100 ft./sec. Reynolds numbers based on the boundary layer thickness were of the order of 106. Turbulence quantities were evaluated from a single rotating hot-wire probe along the entire length of the boundary layer. For all quantities measured, the uncertainty intervals were calculated in order to provide a measure of the reliability of the results. The large scale turbulent boundary layers are shown to approach closely the theoretical requirements for similarity. Displacement and momentum thickness grow as a linear function of x-coordinate, the form factor is constant. The constant wall shear stress requirement is very closely approached. An asymptotic similarity form is considered and reported. For similarity function of the turbulent shear stress distribution across the boundary layer thickness, an approximate linear function is proposed. The best average universal velocity profile is tabulated.
Description
CER68-69DLZ9.
September 1968.
Prepared for U.S. Army Material Command.
Project was supported by the Integrated Army Meteorological Wind Tunnel Research Program.
Includes bibliographical references.
Page 23 is missing.
September 1968.
Prepared for U.S. Army Material Command.
Project was supported by the Integrated Army Meteorological Wind Tunnel Research Program.
Includes bibliographical references.
Page 23 is missing.
Rights Access
Subject
Turbulent boundary layer
Wind tunnels