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Unsteady flow model for circulation-control airfoilsAn analysis and a numerical lifting surface method are developed for predicting the unsteady airloads on two-dimensional circulation control airfoils in incompressible flow. The analysis and the computer program are validated by correlating the computed unsteady airloads with test data and also with other theoretical solutions. Additionally, a mathematical model for predicting the bending-torsion flutter of a two-dimensional airfoil (a reference section of a wing or rotor blade) and a computer program using an iterative scheme are developed. The flutter program has a provision for using the CC airfoil airloads program or the Theodorsen hard flap solution to compute the unsteady lift and moment used in the flutter equations. The adopted mathematical model and the iterative scheme are used to perform a flutter analysis of a typical CC rotor blade reference section. The program seems to work well within the basic assumption of the incompressible flow.
Document ID
19790021973
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Rao, B. M. (Analytical Methods, Inc. Bellevue, WA, United States)
Date Acquired
September 3, 2013
Publication Date
June 1, 1979
Subject Category
Aerodynamics
Report/Patent Number
NASA-CR-152301
Accession Number
79N30144
Funding Number(s)
CONTRACT_GRANT: NAS2-10132
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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