NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Collections About News Help Login
Back to Results
Development of Semi-Span Model Test TechniquesA computational investigation was performed to support the development of a semispan model test capability in the NASA Langley Research Center's National Transonic Facility. This capability is desirable for the testing of advanced subsonic transport aircraft at full-scale Reynolds numbers. A state-of-the-art three-dimensional Navier-Stokes solver was used to examine methods to improve the flow over a semi-span configuration. First, a parametric study is conducted to examine the influence of the stand-off height on the flow over the semispan model. It is found that decreasing the stand-off height, below the maximum fuselage radius, improves the aerodynamic characteristics of the semi-span model. Next, active sidewall boundary layer control techniques are examined. Juncture region blowing jets, upstream tangential blowing, and sidewall suction are found to improve the flow over the aft portion of the semispan model. Both upstream blowing and suction are found to reduce the sidewall boundary layer separation. The resulting near surface streamline patterns are improved, and found to be quite similar to the full-span results. Both techniques however adversely affect the pitching moment coefficient.
Document ID
19960024188
Acquisition Source
Langley Research Center
Document Type
Technical Memorandum (TM)
Authors
Milholen, William E., II (North Carolina State Univ. Raleigh, NC United States)
Chokani, Ndaona (North Carolina State Univ. Raleigh, NC United States)
McGhee, Robert J. (NASA Langley Research Center Hampton, VA United States)
Date Acquired
September 8, 2013
Publication Date
June 20, 1996
Subject Category
Aerodynamics
Report/Patent Number
NASA-TM-111583
NAS 1.15:111583
Meeting Information
Meeting: AIAA Applied Aerodynamics Conference
Location: New Orleans, LA
Country: United States
Start Date: June 17, 1996
End Date: June 20, 1996
Accession Number
96N26740
Funding Number(s)
CONTRACT_GRANT: NCC1-169
Distribution Limits
Public
Copyright
Public Use Permitted.

Related Records

There are no records associated with this record.
No Preview Available