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Transonic interference reduction by limited ventilation wall panelsIn two wind tunnels used for the two-dimensional airfoil tests, each wall above and below the model was modified by replacing small segments of the solid boundaries with perforated plates vented into sealed chambers. Perforated segments having approximately 40 percent open area were found to reduce the transonic wall interference to a negligible level, for a model chord-to-tunnel height ratio of 0.5. This report describes the physical arrangement and presents typical model pressure distributions to illustrate the effectiveness of the technique.
Document ID
19870019986
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Lee, John D. (Ohio State Univ. Columbus, OH, United States)
Date Acquired
September 5, 2013
Publication Date
January 1, 1986
Subject Category
Aerodynamics
Report/Patent Number
NAS 1.26:175039
NASA-CR-175039
Accession Number
87N29419
Funding Number(s)
CONTRACT_GRANT: NAG3-109
PROJECT: RTOP 505-45-54
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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