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Development of Semi-Span Model Test TechniquesA computational investigation was performed to support the development of a semi-span 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 semi-span 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 semi-span 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
20040110854
Acquisition Source
Langley Research Center
Document Type
Conference Paper
Authors
Pulnam, L. Elwood
(NASA Langley Research Center Hampton, VA, United States)
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
August 21, 2013
Publication Date
January 1, 1996
Subject Category
Aerodynamics
Report/Patent Number
AAA Paper 96-2412
Meeting Information
Meeting: 14th AIAA Applied Aerodynamics Conference
Location: New Orleans, LA
Country: United States
Start Date: June 17, 1996
End Date: June 20, 1996
Sponsors: American Inst. of Aeronautics and Astronautics
Funding Number(s)
CONTRACT_GRANT: NCC1-169
Distribution Limits
Public
Copyright
Public Use Permitted.
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