Abstract
The effects of very small, low-frequency perturbations on steady transonic flows, in the context of twodimensional flows described by the small perturbation equation, are investigated. Previous time-linearized studies failed to account for the shock wave motions that are known to occur. A method is provided that allows one to correctly account for shock wave motions due to arbitrary but small unsteady changes in the boundary conditions. Consequently, both harmonic and indicia! responses may be determined. Time-linearized results for the transonic flow past an NACA 64A006 airfoil experiencing harmonic motions in one of several modes are presented. Selected results are compared with those obtained from nonlinear calculations using a shock-fitting algorithm.
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