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Numerical solutions of the linearized Euler equations for unsteady vortical flows around lifting airfoilsA linearized unsteady aerodynamic analysis is presented for unsteady, subsonic vortical flows around lifting airfoils. The analysis fully accounts for the distortion effects of the nonuniform mean flow on the imposed vortical disturbances. A frequency domain numerical scheme which implements this linearized approach is described, and numerical results are presented for a large variety of flow configurations. The results demonstrate the effects of airfoil thickness, angle of attack, camber, and Mach number on the unsteady lift and moment of airfoils subjected to periodic vortical gusts. The results show that mean flow distortion can have a very strong effect on the airfoil unsteady response, and that the effect depends strongly upon the reduced frequency, Mach number, and gust wave numbers.
Document ID
19900037986
Document Type
Conference Paper
Authors
Scott, James R. (NASA Lewis Research Center Cleveland, OH, United States)
Atassi, Hafiz M. (Notre Dame, University IN, United States)
Date Acquired
August 14, 2013
Publication Date
January 1, 1990
Subject Category
AERODYNAMICS
Report/Patent Number
AIAA PAPER 90-0694
Distribution Limits
Public
Copyright
Other