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Application of multivariable search techniques to the optimization of airfoils in a low speed nonlinear inviscid flow fieldMultivariable search techniques are applied to a particular class of airfoil optimization problems. These are the maximization of lift and the minimization of disturbance pressure magnitude in an inviscid nonlinear flow field. A variety of multivariable search techniques contained in an existing nonlinear optimization code, AESOP, are applied to this design problem. These techniques include elementary single parameter perturbation methods, organized search such as steepest-descent, quadratic, and Davidon methods, randomized procedures, and a generalized search acceleration technique. Airfoil design variables are seven in number and define perturbations to the profile of an existing NACA airfoil. The relative efficiency of the techniques are compared. It is shown that elementary one parameter at a time and random techniques compare favorably with organized searches in the class of problems considered. It is also shown that significant reductions in disturbance pressure magnitude can be made while retaining reasonable lift coefficient values at low free stream Mach numbers.
Document ID
19760002974
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Hague, D. S. (Aerophysics Research Corp. Bellevue, WA, United States)
Merz, A. W. (Aerophysics Research Corp. Bellevue, WA, United States)
Date Acquired
September 3, 2013
Publication Date
July 1, 1975
Subject Category
Aerodynamics
Report/Patent Number
TN-206
NASA-CR-137760
Accession Number
76N10062
Funding Number(s)
CONTRACT_GRANT: NAS2-8599
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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