Variable Geometry Pipe Diffusers

[+] Author and Article Information
J. W. Salvage

United Technologies, Carrier, Syracuse, NY 13221

J. Turbomach 119(4), 831-838 (Oct 01, 1997) (8 pages) doi:10.1115/1.2841194 History: Received February 01, 1996; Online January 29, 2008


Theoretical analyses and experimental results are reported for two unique variable geometry techniques used with pipe diffusers to enhance off-design performance. One technique mechanically closes the diffuser throat in an unusual manner. The other allows flow recirculation to close the throat artificially while attempting to improve diffuser inlet flow characteristics. Results clearly show that surge margin may be significantly improved by either method and that flow recirculation may offer improved efficiency.

Copyright © 1997 by The American Society of Mechanical Engineers
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