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Design of the low-speed NLF(1)-0414F and the high-speed HSNLF(1)-0213 airfoils with high-lift systemsThe design and testing of Natural Laminar Flow (NLF) airfoils is examined. The NLF airfoil was designed for low speed, having a low profile drag at high chord Reynolds numbers. The success of the low speed NLF airfoil sparked interest in a high speed NLF airfoil applied to a single engine business jet with an unswept wing. Work was also conducted on the two dimensional flap design. The airfoil was decambered by removing the aft loading, however, high design Mach numbers are possible by increasing the aft loading and reducing the camber overall on the airfoil. This approach would also allow for flatter acceleration regions which are more stabilizing for cross flow disturbances. Sweep could then be used to increase the design Mach number to a higher value also. There would be some degradation of high lift by decambering the airfoil overall, and this aspect would have to be considered in a final design.
Document ID
19900003224
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Viken, Jeffrey K. (Complere, Inc., Hampton VA., United States)
Watson-Viken, Sally A. (Complere, Inc., Hampton VA., United States)
Pfenninger, Werner (Analytical Services and Materials, Inc., Hampton VA., United States)
Morgan, Harry L., Jr. (NASA Langley Research Center Hampton, VA., United States)
Campbell, Richard L. (NASA Langley Research Center Hampton, VA, United States)
Date Acquired
September 6, 2013
Publication Date
December 1, 1987
Publication Information
Publication: Research in Natural Laminar Flow and Laminar-Flow Control, Part 3
Subject Category
Aerodynamics
Accession Number
90N12540
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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