Acoustic design features and techniques employed in the Quiet Clean Short-Haul Experimental Engine (QCSEE) Program are described. The role of jet/flap noise in selecting the engine fan pressure ratio for powered lift propulsion systems is discussed. The QCSEE acoustic design features include a hybrid inlet (near-sonic throat velocity with acoustic treatment); low fan and core pressure ratios; low fan tip speeds; gear-driven fans; high and low frequency stacked core noise treatment; multiple-thickness treatment; bulk absorber treatment; and treatment on the stator vanes. The QCSEE designs represent and anticipated acoustic technology improvement of 12 to 16 PNdb relative to the noise levels of the low-noise engines used on current wide-body commercial jet transport aircraft.
Acoustic design of the QCSEE propulsion systems
1976-01-01
Conference paper
No indication
English
QCSEE over-the-Wing Engine Acoustic Data
NTIS | 1982
|QCSEE Over-the-Wing Engine Acoustic Data
NTRS | 1982
|QCSEE UTW engine powered-lift acoustic performance
NTRS | 1980
|QCSEE UTW engine powered-lift acoustic performance
AIAA | 1980
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