Abstract
Aerodynamic characteristics of three-dimensional unstalled cascade oscillating in a uniform incompressible flow are predicted numerically. Unsteady formulation is based on a small perturbation approach with use of potential equations expressed on a moving computational grid. The governing equations are discretized by the finite element method. A parametric study on unsteady aerodynamic characteristics is conducted for the three-dimensional rotor cascade of a low-speed axial-flow compressor. Flutter characteristics of blades oscillating with first three eigenmodes, i.e., first bending mode, second bending mode, and first torsion mode, are shown, and the distribution of flutter excitation along the blade span is described.
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