A twin-engine, low-wing transport model, with a supercritical wing designed for a cruise Mach number of0.77 and a lift coefficient of 0.55, was tested in the 16-Foot Transonic Tunnel at NASA Langley Research Center. The purpose of this test was to compare the wing/nacelle interference effects of superfans (very high bypass ratio turbofans, BPR ≈ 18) with the interference effects of advanced turbofans (BPR ≈ 6). Flow-through nacelles were used in this study. Forces and moments on the complete model were measured using a strain gage balance and extensive surface static pressure measuements (383 orifice locations) were made on the model’s wing, nacelles, and pylons. Data were taken at Mach numbers from 0.50 to 0.80 and model angle-of-attack was varied from −4 to +8 deg. Results of the investigation indicate that superfan nacelles can be installed with approximately the same drag penalty as conventional turbofan nacelles.
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October 1992
Research Papers
Interference Effects of Very High Bypass Ratio Nacelle Installations on a Low-Wing Transport
A. M. Ingraldi,
A. M. Ingraldi
NASA Langley Research Center, Hampton, VA 23681
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T. T. Kariya,
T. T. Kariya
Vigyan Research Associates, Inc., Hampton, VA 23666
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R. J. Re,
R. J. Re
NASA Langley Research Center, Hampton, VA 23681
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O. C. Pendergraft, Jr.
O. C. Pendergraft, Jr.
NASA Langley Research Center, Hampton, VA 23681
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A. M. Ingraldi
NASA Langley Research Center, Hampton, VA 23681
T. T. Kariya
Vigyan Research Associates, Inc., Hampton, VA 23666
R. J. Re
NASA Langley Research Center, Hampton, VA 23681
O. C. Pendergraft, Jr.
NASA Langley Research Center, Hampton, VA 23681
J. Eng. Gas Turbines Power. Oct 1992, 114(4): 809-815 (7 pages)
Published Online: October 1, 1992
Article history
Received:
March 4, 1991
Online:
April 24, 2008
Citation
Ingraldi, A. M., Kariya, T. T., Re, R. J., and Pendergraft, O. C., Jr. (October 1, 1992). "Interference Effects of Very High Bypass Ratio Nacelle Installations on a Low-Wing Transport." ASME. J. Eng. Gas Turbines Power. October 1992; 114(4): 809–815. https://doi.org/10.1115/1.2906661
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