Investigation of flutter prediction method for transonic fan

Numerical simulation of three-dimensional unsteady viscous flow around oscillating transonic fan was carried out in the influence coefficient domain with one blade oscillating in various three-dimensional rigid-body modes.Then the stability parameter map was gotten based on the assumption of rigid body mode and mode superposition method.The main result of this paper is that,the shock wave has dominant contribution on the unsteady aerodynamic force,mode shape has an important effect on flutter stability,and the stability parameter of transonic fan and subsonic low pressure turbine has similar pattern.