An unpowered semispan model of a representative turboprop configuration was tested to determine the effect of configuration modifications on the the nonmetric body and wing juncture. It is indicated that the jet off nacelle-installation drag can be approximately 25% of the cruise drag. However, the losses can be reduced to 17% by changes to the wing leading edge and nacelle intersection. Comparison of test results from a semispan nonmetric fuselage model with those from a full span metric fuselage show differences in angles of attack produced the same lift. It is found that the constant lift drag rise of the semispan model is higher because of the increased angle of attack to achieve the same lift.
Installed Nacelle Drag-Improvement Tests of an M = 0.8 Turboprop Transport Configuration
1983
378 pages
Report
No indication
English
Aerodynamics , Drag reduction , Interference drag , Nacelles , Propulsion system configurations , Supercritical wings , Turboprop aircraft , Wind tunnel tests , Wing nacelle configurations , Angle of attack , Dynamic characteristics , Leading edges , Lift , Mach number , Reynolds number , Seals (Stoppers) , Transonic wind tunnels