Computing Dynamic Coefficients of See-through

ZHAO Sanxing^1,2  MENG Guang¹  LENG Xiaolei¹  JING Jianping¹

(1. State Key Laboratory of Vibration, Shock & Noise, Shanghai Jiaotong University, Shanghai 200240;

2. School of Machinery & Automation, Wuhan University of Science and Technology, Wuhan 430081 )

Abstract: The improved two-control-volume model is used to compute the dynamic coefficients of see-through labyrinth seal, and the one-control-volume model is also introduced briefly. The theoretical results from the improved two-control-volume model are in well agreement with the experimental data, so the improved method is feasible. The influences of seal clearance and running speeds on dynamic coefficients for both the teeth-on-rotor and the teeth-on-stator seals are presented. Dynamic coefficients for a certain see-through labyrinth seal are calculated respectively using both one-control-volume and two-control-volume models, and the two kinds of results are compared. Some interesting conclusions are drawn.

Key words: Steam turbine  See-through labyrinth seal  Dynamic coefficients

CLC No: TK26

国家863计划(2002AA52613-8)和上海市优秀学科带头人计划(04XD14012)资助项目. Received 20050603, received in revised form 20051025