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NASA Ames 40 x 80 Wind Tunnel Test JT8D17 Engine With 20Lobe
Boeing 9x9 Wind Tunnel Test 20Lobe EjectorSuppressorLined
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1/3-OB center frequency 140 Angle relative 20-Lobe Ejector 20-lobe ejector/suppressor 727 Flight Data 80 flight effects 80 Versus 80 Wind Tunnel Ames 40 x configuration convection and noise core noise corrected for convection corrected for reverberation cutback power Doppler frequency shift Engine With Baseline Engine With Lined fan noise far-field angles field angle relative flight conditions flight noise levels flyovers ft/s Hardwall Hz Figure inlet axis internal mixer jet noise Lined Internal low angles NASA Ames 40 near-field near/far field correlation noise floor noise increment noise reduction OASPL and PNL peak noise PNdB primary relative velocity reference noise relative to inlet sideline TRV-L MIC spectra takeoff power Test JT8D-17 Engine Tunnel Test JT8D Tunnel Test JT8D-17 Tunnel TestJT8D-17 Engine tunnel velocity tunnel-off and tunnel-on Tunnel-on data corrected tunnel-on noise Versus 727 Flight Vmix Vmjx Vprj Wind Tunnel Test Wind Tunnel TestJT8D-17 x 80 Wind