ABSTRACT
An unsteady flow may vary in time either randomly (turbulence) or periodically. It is the latter type that we are dealing with here. Regarding turbomachinery performances, there are two main aspects associated with unsteady flow effects: (1) aero thermal performance due to blade-row interaction and flow instability (stall/surge); (2) blade mechanical integrity due to flow-induced vibrations (forced response and flutter).
