Labyrinth Seal Effects on Rotor Bearing System Stability.

摘要

This thesis presents a stability analysis of rotor bearing system operation affected by a single labyrinth seal. Labyrinth seals, primarily intended for leakage control in turbines, have been observed to affect rotor stability in high pressure steam turbines. A small experimental rotor bearing system, existing in the Mechanical Engineering Department, and a compatible labyrinth seal are the subjects of this analysis. Linear analytical models of these rotor bearing and labyrinth seal systems, both isolated and coupled, are developed. Labyrinth seal geometry and pressure variations generate various affects on rotor bearing system stability. These affects can help develop labyrinth seal design criteria directed toward high pressure turbine stability enhancement. (Author)