INSTALLATION AERODYNAMICS OF WING-MOUNTED, SINGLE-ROTATION PROPFANS 861719
The installation of advanced (M = 0.8) turboprop propulsion systems on transport aircraft represents a challenging task to design engineers. The installation aerodynamics of wing-mounted, single-rotation (SR), tractor turboprop systems have been extensively investigated by NASA Ames using a large powered semi-span wind tunnel model. Two configurations have been studied: a straight under-the-wing (UTW) nacelle and a contoured over-the-wing (OTW) configuration. The installation characteristics of these two configurations are presented in terms of installed drag, wing pressure distributions, and surface oil flows. Through the use of wing leading-edge modifications, the installed drag of the UTW nacelle was reduced to less than isolated nacelle drag at the cruise condition of M = 0.8 with a wing CL of 0.5. At this condition, the favorable interference is attributed to the recovery of a portion of the swirl in the slipstream generated by the single rotation propeller. The OTW installation represented a much more difficult task. For the configuration tested, the installed drag was unacceptably high and demonstrated the sensitive nature of installing a nacelle/slipstream combination in the transonic flow regime.
Citation: Bencze, D., Smith, R., and Levin, A., "INSTALLATION AERODYNAMICS OF WING-MOUNTED, SINGLE-ROTATION PROPFANS," SAE Technical Paper 861719, 1986, https://doi.org/10.4271/861719. Download Citation
Author(s):
Daniel P. Bencze, Ronald C. Smith, Alan D. Levin
Affiliated:
NASA Ames Research Center, Moffett Field, California
Pages: 17
Event:
SAE Aerospace Technology Conference and Exposition
ISSN:
0148-7191
e-ISSN:
2688-3627
Also in:
SAE 1986 Transactions - Aerospace-V95-6
Related Topics:
Drag
Aircraft
Wind tunnel tests
Aerodynamics
Wings
Propellers and rotors
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