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Results for the hybrid laminar flow control experiment conducted in the NASA Langley 8-foot transonic pressure tunnel on a 7-foot chord modelA description is given of the development of, and results from, the hybrid laminar flow control (HLFC) experiment conducted in the NASA LaRC 8 ft Transonic Pressure Tunnel on a 7 ft chord, 23 deg swept model. The methods/codes used to obtain the contours of the HLFC model surface and to define the suction requirements are outlined followed by a discussion of the model construction, suction system, instrumentation, and some example results from the wind tunnel tests. Included in the latter are the effects of Mach number, suction level, and the extent of suction. An assessment is also given of the effect of the wind tunnel environment on the suction requirements. The data show that, at or near the design Mach number, large extents of laminar flow can be achieved with suction mass flows over the first 25 percent, or less, of the chord. Top surface drag coefficients with suction extending from the near leading edge to 20 percent of the chord were approximately 40 percent lower than those obtained with no suction. The results indicate that HLFC can be designed for transonic speeds with lift and drag coefficients approaching those of LFC designs but with much smaller extents and levels of suction.
Document ID
19940028364
Acquisition Source
Legacy CDMS
Document Type
Technical Memorandum (TM)
Authors
Bobbitt, Percy J. (NASA Langley Research Center Hampton, VA, United States)
Ferris, James C. (NASA Langley Research Center Hampton, VA, United States)
Harvey, William D. (NASA Langley Research Center Hampton, VA, United States)
Goradia, Suresh H. (NASA Langley Research Center Hampton, VA, United States)
Date Acquired
September 6, 2013
Publication Date
March 1, 1992
Subject Category
Astronautics (General)
Report/Patent Number
NAS 1.15:107582
NASA-TM-107582
Accession Number
94N32870
Funding Number(s)
PROJECT: RTOP 505-69-20-01
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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