1998 Volume 64 Issue 617 Pages 98-103
Large size turbine generator inside is cooled by hydrogen gas. The casing of generator provides a hydrogentight enclousure and seal rings are located at both end of the casing, in order to seal between the rotor and the stationary parts. In the case of bad sliding condition of seal ring, the shaft vibration of generator rotor is increased due to the rubbing phenomina between seal ring and rotor shaft. Using test and analysis, the characteristics of the seal ring rubbing phenomina are obtained. The test are conducted using the full size model. The test result shows good agreement with the analytical result. The discriminating and preventive method of this phenomena are discussed.