Design of Shroud Interface-Angle to Minimize the Forced Vibration of Blades

Abstract

The blades with integral shrouds have been used widely in industry. The blades are brought together via the contact of shroud interfaces. Because the angle of shroud interface can alter the damping of the interfaces and the coupling effect among the blades, knowing how to design the shroud angle is important. In this work, the theoretical shroud model was first verified experimentally, and then used to investigate the effect of shroud angle on the resonant responses excited by wake flow. The results show that a small shroud angle is superior than large shroud angle to minimize the resonant vibration. However, a critical static interface preload should be selected to avoid the weak coupling effect.