Experiments With a Model Free Rotating Vaneless Diffuser

[+] Author and Article Information
C. Rodgers, H. Mnew

Solar Division of International Harvester Co., San Diego, Calif.

J. Eng. Power 97(2), 231-242 (Apr 01, 1975) (12 pages) doi:10.1115/1.3445970 History: Received November 27, 1973; Online July 14, 2010


Experimental testing of a model free-rotating vaneless diffuser, for application to high pressure ratio single-stage centrifugal compressors, was conducted to determine diffuser performance under braked and free rotating conditions at entry Mach numbers up to unity. The experimental test rig comprised a swirl generating nozzle upstream of the model vaneless diffuser rotor with an outer-to-inner diameter ratio of 1.3. Additional downstream diffusion was completed with stationary vaneless and vaned diffuser inserts. A significant improvement in diffuser performance was achieved under free-rotating conditions even though large wakes generated by upstream stationary swirl nozzles were present. Overall static pressure recovery for the complete diffusion system increased approximately 20 percent at free-rotating conditions corresponding to a tangential velocity ratio (diffuser rotor/incident stream) of 0.43.

Copyright © 1975 by ASME
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