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Quiet Clean Short-Haul Experimental Engine (QCSEE) aerodynamic characteristics of 30.5 centimeter diameter inletsA low speed test program was conducted in a 9- by 15-foot V/STOL wind tunnel to investigate internal performance characteristics and determine key design features required for an inlet to meet the demanding operational conditions of the QCSEE application. Four models each having a design average throat Mach number of 0.79 were tested over a range of incidence angle, throat Mach number, and freestream velocity. Principal design variable was internal lip diameter ratio. Stable, efficient inlet performance was found to be feasible at and beyond the 50 deg incidence angle required by the QCSEE application at its 41.2 m/sec (80 knot) nominal takeoff velocity, through suitably designed inlet lip and diffuser components. Forebody design was found to significantly impact flow stability via nose curvature. Measured inlet wall pressures were used to select a location for the inlet throat Mach number control's static pressure port that properly balanced the conflicting demands of relative insensitivity to flow incidence and sufficiently high response to changes in engine flow demand.
Document ID
19760020152
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Paul, D. L. (General Electric Co. Cincinnati, OH, United States)
Date Acquired
September 3, 2013
Publication Date
August 1, 1975
Subject Category
Aircraft Propulsion And Power
Report/Patent Number
R75AEG494
NASA-CR-134866
Accession Number
76N27240
Funding Number(s)
CONTRACT_GRANT: NAS3-18021
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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