Investigation of Structurally and Aerodynamically Mistuned Oscillating Cascade Using Fully Coupled Method

Abstract There seems to be a lack of clear and systematic understanding physical behavior mechanisms mistuned blade rows, particularly in the context aerodynamic mistuning versus structural (frequency) mistuning. A high-fidelity fully coupled method is desirable investigate vibration characteristics aeroelasticity problems with strong fluid–structure interaction effects, as well effects. In this work, direct nonlinear time-domain adopted dynamics mechanism oscillating cascade. The main objectives are two-folds, first elucidate basic row, second examine aeroelastic effects Three conditions interest considered: (a) only, (b) (c) combination two. present results show that configuration tends vibrate same frequency predominantly constant interblade phase angle. Vibration amplitudes blades vary significantly mode localization effect for For concurrent structural-aerodynamic mistuning, stronger than standalone case. Second, monotonic increase stability magnitude observed. On other hand, aerodynamically cascade shows stabilizing small amount but exhibits destabilizing large Furthermore, these indicate quite remarkable interplay between At condition where tuned still stable, an aero-mistuning induced unstable An introduction which would cascade, instead shown have combined aero-structural