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Two-stage fan. 4: Performance data for stator setting angle optimizationStator setting angle optimization tests were conducted on a two-stage fan to improve efficiency at overspeed, stall margin at design speed, and both efficiency and stall margin at partspeed. The fan has a design pressure ratio of 2.8, a flow rate of 184.2 lb/sec (83.55 kg/sec) and a 1st-stage rotor tip speed of 1450 ft/sec (441.96 in/sec). Performance was obtained at 70,100, and 105 percent of design speed with different combinations of 1st-stage and 2nd-stage stator settings. One combination of settings, other than design, was common to all three speeds. At design speed, a 2.0 percentage point increase in stall margin was obtained at the expense of a 1.3 percentage point efficiency decrease. At 105 percent speed, efficiency was improved by 1.8 percentage points but stall margin decreased 4.7 percentage points. At 70 percent speed, no change in stall margin or operating line efficiency was obtained with stator resets although considerable speed-flow requlation occurred.
Document ID
19750007580
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Burger, G. D.
(Pratt and Whitney Aircraft East Hartford, CT, United States)
Keenan, M. J.
(Pratt and Whitney Aircraft East Hartford, CT, United States)
Date Acquired
September 3, 2013
Publication Date
January 1, 1975
Subject Category
Aircraft Propulsion And Power
Report/Patent Number
NASA-CR-134717
PWA-5225
Accession Number
75N15652
Funding Number(s)
CONTRACT_GRANT: NAS3-13494
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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