Effects of Inlet Flow Field Conditions on the Performance of Centrifugal Compressor Diffusers: Part 1—Discrete-Passage Diffuser

[+] Author and Article Information
V. G. Filipenco, S. Deniz, J. M. Johnston, E. M. Greitzer

Gas Turbine Laboratory, Massachusetts Institute of Technology, Cambridge, MA 02139

N. A. Cumpsty

Whittle Laboratory, Department of Engineering, Cambridge University, Cambridge CB3 ODY, United Kingdom

J. Turbomach 122(1), 1-10 (Feb 01, 1998) (10 pages) doi:10.1115/1.555418 History: Received February 01, 1998
Copyright © 2000 by ASME
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Discrete-passage diffuser geometry schematic
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Overall test facility schematic
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Swirl generator blading. Blade number Zb=71.
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Schematic of axial flow injection/suction system
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Examples of the axial distribution of (a) flow angle, α, and (b) absolute Mach number, M, at discrete passage diffuser inlet: (○ ) no injection/suction, (Δ, □ ) with injection/suction
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(a) Availability-averaged overall discrete-passage diffuser (30 passages) pressure recovery coefficient, Cpψ, versus momentum-averaged diffuser inlet flow angle, α. (b) Overall discrete-passage diffuser (30 passages) pressure recovery coefficient, Cpa, based on the diffuser inlet area-averaged dynamic pressure versus momentum-averaged diffuser inlet flow angle, α. (c) Overall discrete-passage diffuser (30 passages) pressure recovery coefficient, Cpb, based on the diffuser inlet local maximum total pressure versus momentum-averaged diffuser inlet flow angle, α. (d) Overall discrete-passage diffuser (30 passages) pressure recovery coefficient, Cpc, based on the diffuser inlet area-averaged absolute velocity and static density versus momentum-averaged diffuser inlet flow angle, α.
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Comparison of overall diffuser pressure recovery coefficient between 30 and 38 passage discrete-passage diffusers
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Static pressure distribution along discrete passage diffuser passage centerline (30 passages) at (a) 2000 rpm, and (b) 6000 rpm, for flow angles from maximum flow rate to rotating stall threshold



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