Installation effects of wing-mounted turbofan nacelle-pylons on a 1/17 scale, twin-engine, low-wing transport model
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16-Foot Transonic Tunnel aerodynamic force airfoil airfoil sections angles of attack aspect ratio ATF nacelle installed boundary-layer bypass ratio BPR centerbody Clean wing clean-wing configuration Config core cowl cross-sectional shape cruise lift coefficient cruise Mach number drag coefficient drag counts drag levels flow-through nacelles fuselage centerline high bypass ratio High-Wing Transport installed at 77 interference drag internal-drag calculations intersects the wing Langley 16-Foot Transonic Langley Research Center leading edge low-wing transport model Lower 77 Lower surface x/c mean aerodynamic chord nacelle centerline nacelle fan cowl nacelle incidence Nacelle internal orifices nacelle-pylon installation NASA nose number of 0.77 orifice rows orifices FS percent pylon quarter-chord SF-2 nacelle installation shown in figure silicon carbide grit span station supercritical wing surface Lower surface surface x/c z/c test section three nacelle tions turbofan engines Upper surface Lower wing lower surface wing reference plane x/c z/c x/c z/c x/c z/c