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Boundary-layer control for drag reductionAlthough the number of possible applications of boundary-layer control is large, a discussion is given only of those that have received the most attention recently at NASA Langley Research Center to improve airfoil drag characteristics. This research concerns stabilizing the laminar boundary layer through geometric shaping (natural laminar flow, NLF) and active control involving the removal of a portion of the laminar boundary layer (laminar flow control, LFC) either through discrete slots or a perforated surface. At low Reynolds numbers, a combination of shaping and forced transition has been used to achieve the desired run of laminar flow and control of laminar separation. In the design of both natural laminar flow and laminar flow control airfoils and wings, boundary layer stability codes play an important role. A discussion of some recent stability calculations using both incompressible and compressible codes is given.
Document ID
19890023280
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Harvey, William D.
(NASA Langley Research Center Hampton, VA, United States)
Date Acquired
August 13, 2013
Publication Date
January 1, 1988
Subject Category
Aerodynamics
Report/Patent Number
SAE PAPER 872434
Meeting Information
Meeting: International Pacific Air and Space Technology Conference
Location: Melbourne
Country: Australia
Start Date: November 13, 1987
End Date: November 17, 1987
Sponsors: SAE
Accession Number
89A10651
Distribution Limits
Public
Copyright
Other

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