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Improved design of subcritical and supercritical cascades using complex characteristics and boundary-layer correctionThe method of complex characteristics and hodograph transformation for the design of shockless airfoils was extended to design supercritical cascades with high solidities and large inlet angles. This capability was achieved by introducing a conformal mapping of the hodograph domain onto an ellipse and expanding the solution in terms of Tchebycheff polynomials. A computer code was developed based on this idea. A number of airfoils designed with the code are presented. Various supercritical and subcritical compressor, turbine and propeller sections are shown. The lag-entrainment method for the calculation of a turbulent boundary layer was incorporated to the inviscid design code. The results of this calculation are shown for the airfoils described. The elliptic conformal transformation developed to map the hodograph domain onto an ellipse can be used to generate a conformal grid in the physical domain of a cascade of airfoils with open trailing edges with a single transformation. A grid generated with this transformation is shown for the Korn airfoil. Previously announced in STAR as N83-24474
Document ID
19840056052
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Sanz, J. M.
(NASA Lewis Research Center Fluid Mechanics and Acoustics Div., Cleveland, OH; Universities Space Research Association, Columbia, United States)
Date Acquired
August 12, 2013
Publication Date
July 1, 1984
Publication Information
Publication: AIAA Journal
Volume: 22
ISSN: 0001-1452
Subject Category
Aerodynamics
Accession Number
84A38839
Distribution Limits
Public
Copyright
Other

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