Analysis of noise measured from a propeller in a wake
P. J. W. Block, United States. National Aeronautics and Space Administration. Scientific and Technical Information Branch
National Aeronautics and Space Administration, Scientific and Technical Information Branch, 1984 - Technology & Engineering - 45 pages
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25 to airfoil 30 downstream 30 upstream 80 Thrust A-weighted sound level acoustic data acoustic signal airfoil sections analysis angle of attack AOASPL decreased ARA-D chord thick t/c CM CM CM Effect of propeller Figure 12 flow 30 given in figure harmonic analysis increasing propeller thrust Langley Research Center lb t/c lb Thrust maximum value mic 3a Microphone 3c microphone locations NACA 16-series sections nacelle NASA Noise measurements noise produced observer location once-per-revolution signal overall sound pressure performance and noise produced by propeller propeller blade propeller chord thick propeller diameter propeller disk plane propeller in wake propeller noise propeller performance propeller test stand propellers were operated Pusher Propeller quiet flow facility scaled A-weighted sound shown in figure sound pressure level test conditions three streamwise trends in AOASPL Twin values of AOASPL wake is introduced wake-producing airfoil