The effect of forward speed on J85 engine noise from suppressor nozzles as measured in the NASA-Ames 40- by 80-foot wind tunnel |
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The effect of forward speed on J85 engine noise from suppressor nozzles as ... Adolph Atencio No preview available - 1977 |
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104-tube nozzle 160 ACOUSTIC ANGLE 32 SPOKE 80-Foot Wind Tunnel ACOUSTIC ANGLE REFERENCED acoustic data acoustic shroud AIE nozzle auxiliary inlet ejector Comparison of wind-tunnel conical ejector nozzle conical nozzle corrected for convection data were corrected deg Figure Doppler shift effect of forward ENGINE INLET AXIS engine power setting far-field directivity FI06B FLIGHT flight data forward quadrant noise ground reflections inlet ejector nozzle isolated nacelle installation J85 ENGINE JET RELATIVE VELOCITY kg/sec P8/Po AE8 Lewis Research Center m/sec ft/sec m² rpm microphone positions nacelle under wing NASA near-field noise measurements noise vs relative nozzle exit NOZZLE WITH SHROUD nozzle without shroud OASPL directivity outdoor static test PEAK OASPL PNL directivity point m/sec REFERENCED TO ENGINE REFERENCED TO INLET RELATIVE VELOCITY Figure shows data SIDELINE sound pressure level TUBE NOZZLE TUNNEL DATA Vj velocity index wind-tunnel data wind-tunnel forward speed wind-tunnel tests wind-tunnel velocity wing installation