EXPERIMENTAL MEASUREMENT AND

NUMERICAL SIMULATION OF DY-NAMICS

 OF LABYRINTH SEAL-ROTOR COMBINATION

WANG Weizhe¹  LIU Yingzheng¹  YE Chun¹  XIN Jianhua¹  CHEN Hanping¹  JING Jianping¹  GE Qing²  YUAN Ying²

(1. School of Mechanical Engineering, Shanghai Jiaotong University, Shanghai 200030; 2. Shanghai Turbine Ltd, Shanghai 200240 )

Abstract: The aerodynamic forcing exerted by the air flow through the labyrinth seal acts on the rotor and accordingly shifts the rotor dynamics. Toward the end of gaining insight into this, the labyrinth seal-rotor experimental apparatus is established. The air flow and rotor dynamics of the labyrinth seal-rotor combination at the pressure ratio 1.5, 3.0, 6.0 and 7.0 is measured. The numerical simulation based on perturbation analysis is performed. The comparative investigation of the cavity averaged pressure, periphery pressure distribution and the critical rotating speed demonstrates the reduction of the critical rotating speed by the leakage flow, as well as the favorable agreement between the experimental measurement and numerical simulation.

Key words: Labyrinth seal Rotor dynamics Critical rotating speed

CLC No: TK263.2

国家863重大专项计划资助项目(2002AA526013-8). Received 20060306, received in revised form 20061106