Acoustic and Aerodynamic Study of a Pusher-propeller Aircraft ModelNational Aeronautics and Space Administration, Office of Management, Scientific and Technical Information Division, 1990 - Propellers, Aerial - 59 pages |
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10-Foot Wind Tunnel 90 Lpc f acoustic pressure aerodynamic airfoil ALPHA Ames Research Center angle angle of attack background noise blade interactions blade loading blade-passage frequency blade-passage noise Block and Gentry broadband noise computed dorsal fin empennage surface empennage trailing edge empennage wake empennage/propeller spacing Filotas floor reflections flow FORMAT 2X fuselage harmonic levels harmonic noise levels harmonics of blade-passage higher harmonics Horne and Soderman I-tail wake in-flow increased INPUT interac interaction noise Larrabee and French Lp f m/sec measured microphone 12 monics NASA noise decay NP+1 peak peller PRESSURE SIGNAL propeller blade propeller interaction propeller noise propeller/empennage pusher propeller radiated noise RADIUS relative ROTOR SEARS shear layer shown in figure spectra strut SUBROUTINE TAIL I-TAIL TAIL NO TAIL test section three empennages THRUST turbulence velocity wake deficit wake width Wilby Wind Tunnel wind turbine windspeed WRITE IPRT Y-tail