FLOW DAMS IN LABYRINTH SEALS TO IMPROVE ROTOR STABILITY

摘要

16 53,875 Methods and apparatus for preventing swirl in a steam turbine having an annular- shaped stationary portion through which extends in regions of differential pressure a rotatable shaft include flow dams situated perpendicularly with respect to a plurality of spaced-apart annular teeth which extend radially inward from the stationary portion toward the shaft to within close proximity thereof each adjacent pair of teeth forming a cavity there between By damming the cavities a circumferential steam flow is substantially minimized thereby preventing the conditions necessary for the inducement of swirl.