Finger seal’s hysteresis characteristic based on dynamical model

Abstract

Finger seal (FS) system, which is composed of many components, is used for gas-path sealing and shaft sealing in aero-engine. Because of its complex structure and operation conditions, the previous research on hysteresis characteristic of FS did not consider the dynamical behavior when the rotor ran at high speed. In order to solve this problem, the relations be- tween the dynamical parameters and structure parameters as well as operation parameters in the system are gained through simulation experiment in finite element method. Furthermore, a mass-spring stiffness-damp dynamical model of the FS system is proposed. Thus the dynamical hysteresis characteristic of FS system can be analyzed by the model. The present work shows that radial move and hysteresis characteristic of FS in dynami- cal condition are larger than those in static condition. Mean- while, it also indicates that the dynamical characteristic analysis of the FS is necessary. Moreover, the idea of transforming en- gineering practical system to controllable mathematic system presented in current work provides a valuable thinking for re- lated research works of similar complex system, such as multi- ple objective optimum researches.