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Longitudinal aerodynamic characteristics of a subsonic, energy-efficient transport configuration in the National Transonic FacilityThe Reynolds number, aeroelasticity, boundary layer transition, and nonadiabatic wall temperature effects, and data repeatability was determined in the National Transonic Facility (NTF) for a subsonic, energy efficient transport model. The model was tested over a Mach number range of 0.50 to 0.86 and a Reynolds number range of 1.9 million to approximately 23.0 million (based on mean geometric chord). The majority of the data was taken using cryogenic nitrogen (data at 1.9 million Reynolds number was taken in air). Force and moment, wing pressure, and wing thermocouple data are presented. The data indicate that increasing Reynolds number resulted in greater effective camber of the supercritical wing and horizontal tail, resulting in greater lift and pitching moment coefficients at nearly all angles of attack for M = 0.82. As Reynolds number was increased, untrimmed L/D increased, the angle of attack for maximum L/D decreased, drag creep was reduced significantly, and drag divergence Mach number increased slightly. Data repeatability for both modes of operation of the NTF (air and cryogenic nitrogen) was generally very good, and nonadiabatic wall effects were estimated to be small. Transition-free and transition-fixed configurations had significantly different force and moment data at M = 0.82 for low Reynolds number, and very small differences were noted at high Reynolds numbers.
Document ID
19910018829
Acquisition Source
Legacy CDMS
Document Type
Technical Publication (TP)
Authors
Jacobs, Peter F. (NASA Langley Research Center Hampton, VA, United States)
Gloss, Blair B. (NASA Langley Research Center Hampton, VA, United States)
Date Acquired
September 6, 2013
Publication Date
August 1, 1989
Subject Category
Aerodynamics
Report/Patent Number
L-16569
NASA-TP-2922
NAS 1.60:2922
Accession Number
91N28143
Funding Number(s)
PROJECT: RTOP 505-61-21-03
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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