Aeroacoustic performance of an externally blown flap configuration with several flap noise suppression devices
Daniel J. McKinzie, Lewis Research Center, United States. National Aeronautics and Space Administration. Scientific and Technical Information Branch
National Aeronautics and Space Administration, Scientific and Technical Information Branch, 1982 - Technology & Engineering - 27 pages
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100 Radiation 120 Radiation angle AEROACOUSTIC aerodynamic performance characteristics Aft quadrant spectra Anechoic chamber approach attitude attenuations occurred centimeters Comparison of free-field configuration and configuration data for reference dB occurred dB were produced dimensionless thrust externally blown flap flow turning angle flow turning efficiency flyover and sideline flyover plane Forward 70 free-field acoustic data hertz high-frequency attenuations high-frequency range kilohertz lift coefficient Microphone plane noise attenuations noise produced noise reductions noise sources noise suppression characteristics noise suppression devices nominally nozzle diameters nozzle-to-flap separation distance overall sound pressure perceived noise level percent reduction plug fairings Plugs in slots pressure level directivity produced by configuration ramped screen configuration reduced separation distances reference configuration screen h screen of configuration Screens over slots sideline plane slots and ramped slots with ramped sound pressure level spectral peak static aerodynamic performance thrust coefficient trailing edge unsuppressed configuration UTW EBF wing and flaps