压力波周向传播对风扇转子气动弹性稳定性的影响

Based on a multi-channel computational model， the aeroelastic stability of fan rotor blades in the first bending mode was analyzed using the energy method. The circumferential propagation characteristics of unsteady pressure disturbances induced by blade vibration were examined， and the sources of negative damping in rotor blades were investigated from an energy perspective using the influence coefficient method. The results indicated that unsteady pressure disturbances caused by blade vibrations decayed rapidly in the circumferential direction，with significant disturbances being present only on adjacent blade surfaces. The unsteady aerodynamic pressure generated by the vibrating blade consistently performed positive work on the fluid，contributing to aeroelastic stability. Negative damping in rotor blades primarily originated from the unsteady aerodynamic pressure induced by adjacent blade vibrations. Minimum aerodynamic damping typically occurred at low nodal diameters，where the unsteady aerodynamic pressure on the rotor blade surface caused by adjacent blade vibrations was in phase with the blade’s vibration displacement， resulting in positive work on the blade and thereby providing negative damping.