VIBRATION DAMPING MECHANISM OF VANE IN AXIAL-FLOW ROTARY MACHINE

摘要

PURPOSE:To improve damping effect of the vane without reducing fluid performance of an axial-flow rotary machine in such a way that a laminate metal piece is inserted between a rotor and the dovetail of a vane, and both ends of the laminate metal piece are brought into contact with the appropriate region of the vane plane. CONSTITUTION:A laminate metal plate 7 equipped with a groove part 7a is inserted into a dovetail part 1 which is a connection of a vane 2 and a rotor in a rotary machine. At the part where the metal piece 7 is brought into contact with the dovetail part 1, it is made into almost the same length and width as the dovetail part 1, while at the part where it gets out of place from the dovetail parts on both end sides of the metal piece 7, the width is narrowed, it is brought into contact with the bent face of the vane surface under the pressure of the contact surface, and the gap to the vane surface is reduced so as not to bring turbulence of fluid. Thus, damping effect of the vane 1 can be at all times maximized within operating region, and fluid performance is in no case to be lowered.