迷宫密封不稳定力三维CFD数值分析方法研究

bstract: Rotor–fluid interactions can cause self-excited vibrations in turbomachines. The labyrinth seal forces are characterized by rotordynamic coefficiets. The major goals of this research were to present the whirling rotor-labyrinth seal model and 3D CFD mathematical model for eccentric rotor-labyrinth seal. The labyrinth seals of a compressor eye seal are taken as objects of analysis. For the case, a 3D model with eccentric rotor was solved to obtain the rotordynamic force components utilizing a general CFD program Fluent and further compare the leakage flow and rotor dynamics force predicted to an existing bulk flow computer program DYNLAB currently used by engineering field and another general CFD program CFX TASCFlow. The CFD results demonstrate improved leakage and rotordynamic prediction over bulk-flow approaches. Further the effects of tangential velocity, clearance, axis taper clearance on the labyrinth seal stability were analyzed.