Some effects of vanes and of turbulence in two-dimensional wide-angle subsonic diffusers

Carl A. Moore, Jr, Stephen J. Kline
naca-tn-4080
Jun 1958


Test on two aspects of the behavior of wide-angle, plane-walled, two-dimensional diffusers with essentially incompressible flow have been conducted in the Mechanical Engineering Laboratory at Stanford University. First, a thorough study of the flow mechanism has been made using dye injection in a water table. The four regimes of flow found are delineated on graphs in terms of the three important parameters. Test data from a large water-table unit and a small water-table unit are given. Second, data are presented which demonstrate means for producing efficient diffusers for total included angles up to at least 45 degrees by use of simple, short, flat vanes.

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