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Aerodynamic performance of 1.38-pressure-ratio, variable-pitch fan stageThe performance of a variable pitch fan stage tested over a range of blade setting angles, speeds, and flows is presented. The fan was designed for a tip speed of 289.6 m/sec and a flow of 29.6 kg/sec. The measured performance agreed reasonably well with the design point. The stall margin was only 5 percent. Static thrust values along an operating line ranged from less than 15 to over 115 percent of that at design angle as the blade setting angle was varied from 25 degrees (closed) to -8 degrees (opened). The use of casing treatment increased the stall margin to 20.6 percent but decreased efficiency by 4 percentage points.
Document ID
19790023042
Document Type
Technical Publication (TP)
Authors
Moore, R. D.
(NASA Lewis Research Center Cleveland, OH, United States)
Osborn, W. M.
(NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
September 3, 2013
Publication Date
September 1, 1979
Subject Category
Aircraft Propulsion And Power
Report/Patent Number
NASA-TP-1502
E-9700
Funding Number(s)
PROJECT: RTOP 505-04
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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