Improvement of the Performance of Conical Diffusers by Vortex Generators

[+] Author and Article Information
Y. Senoo

Research Institute of Industrial Science, Kyushu University, Fukuoka, Japan

M. Nishi

Department of Mechanical Engineering, Kyushu Institute of Technology, Kitakyushu, Japan

J. Fluids Eng 96(1), 4-10 (Mar 01, 1974) (7 pages) doi:10.1115/1.3447097 History: Received June 12, 1973; Online October 12, 2010


Vortex generators, which consist of small blades, are applied to conical diffusers the divergence angles of which are 8, 12, 16, 20, and 30 deg, respectively. The area ratio of each diffuser is four. The experiment covers the influence of various parameters, such as the arrangement of blades, inlet boundary layer thickness, and location of vortex generators relative to the conical diffuser, on the pressure-recovery coefficient. The experiment shows that the vortex generators prevent the flow in a conical diffuser from separating up to a divergence angle of 16 deg, and that the pressure-recovery coefficient is approximately equal to that of conventional best conical diffusers.

Copyright © 1974 by ASME
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