Dynamic Analysis of the Finger Seal-Rotor System

Finger seals are widely concerned because of their good sealing performance and low cost. Due to its unique structure and installation, there are complex interactions between the seal laminates, which undoubtedly affect the overall stiffness of the seal. Therefore, it is necessary to conduct an in-depth study on the sealing force model of finger seals. This paper divides the interaction seal force of the finger seal into two parts, the finger beam and finger boot, and establishes a nonlinear seal force model that considers the interaction between finger laminates. A nonlinear dynamics rotor-finger seal system is built, and its dynamic laws are studied by Poincaré mapping, axis trajectory, spectrum diagram and phase diagram. The research in this paper can be used to predict the dynamic behavior of finger seal-rotor systems and ensure the stable operation of rotor systems.