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computer programs for smoothing and scaling airfoil coordinatesDetailed descriptions are given of the theoretical methods and associated computer codes of a program to smooth and a program to scale arbitrary airfoil coordinates. The smoothing program utilizes both least-squares polynomial and least-squares cubic spline techniques to smooth interatively the second derivatives of the y-axis airfoil coordinates with respect to a transformed x-axis system which unwraps the airfoil and stretches the nose and trailing-edge regions. The corresponding smooth airfoil coordinates are then determined by solving a tridiagonal matrix of simultaneous cubic-spline equations relating the y-axis coordinates and their corresponding second derivatives. A technique for computing the camber and thickness distribution of the smoothed airfoil is also discussed. The scaling program can then be used to scale the thickness distribution generated by the smoothing program to a specific maximum thickness which is then combined with the camber distribution to obtain the final scaled airfoil contour. Computer listings of the smoothing and scaling programs are included.
Document ID
19850022698
Document Type
Technical Memorandum (TM)
Authors
Morgan, H. L., Jr.
(NASA Langley Research Center Hampton, VA, United States)
Date Acquired
September 5, 2013
Publication Date
July 1, 1983
Subject Category
AERODYNAMICS
Report/Patent Number
NAS 1.15:84666
NASA-TM-84666
Funding Number(s)
PROJECT: RTOP 505-31-23-06
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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NameType 19850022698.pdf STI