Abstract
As one of the common non-contact seals used in the industry, labyrinth seal has the distinguishing features of simple configuration, strong applicability for multifarious industrial medium and long service life. It's widely used in revolving compressor and turbo-machinery. However with the development of turbo-machinery towards high performance and huge capacity, gas excitation vibration within the labyrinth seal becomes the main reason threatening the safe operating of machinery sets. This paper applied the CFD software FLUENT to study the forces resulted from gas exciting vibration and the dynamic coefficients of labyrinth seals.
Three-dimensional finite element model of labyrinth seal was established, the selection of boundary conditions in this model was analysed. Meanwhile the fluence of grid units to the simulating results was studied. The leakage computed from the simulation and from experiential formulas were compared and showed similar results.
Keywords: Labyrinth seal FLUENT Gas excitation force Dynamic coefficients