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Research Papers

Some Measurements of Boundary-Layer Growth in a Two-Dimensional Diffuser

[+] Author and Article Information
J. F. Norbury

Department of Fluid Mechanics, University of Liverpool, Liverpool, England

J. Basic Eng 81(3), 285-294 (Sep 01, 1959) (10 pages) doi:10.1115/1.4008449 History: Received September 08, 1958; Published September 01, 1959; Online February 20, 2019

Abstract

Low-speed experiments were carried out in a two-dimensional diffuser having a square throat and an area ratio of two to one. Measurements were made of static pressure distribution, velocity contours at throat and outlet, and boundary-layer growth along the four wall center lines. Visual flow experiments were performed using tufts and smoke filaments. Similar experiments were carried out with the throat boundary layers artificially thickened by means of round rods placed on the walls upstream. Disparities between the measured growth of momentum thickness and that predicted by the simple momentum equation are discussed, as well as the effect of the artificial thickening on diffuser efficiency.

Copyright © 1959 by ASME
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