Labyrinth seal as a common industrial form of a seal with a simple structure, adaptability to a variety of industrial medium, and long service life, it is widely used in centrifugal compressors, turbo-expander, steam turbine and other machinery . However, with the Turbomachinery toward large-capacity high-performance and direction, air sealing unit excitation as a threat to the safe operation of one of the main factors. In this paper, the mechanism of excitation around the labyrinth seal and the coefficient of dynamic characteristics of the study started, the application of FLUENT software labyrinth seal on the internal flow field of an in-depth study and a calculation of coefficient of dynamic properties of sealing methods.
In this paper, the main GAMBIT software FLUENT calculation tools, the establishment of the labyrinth seal three-dimensional finite element model, boundary conditions on the selection and division of grid analysis. And the calculation results with the empirical formula calculation results are compared with simulation results and empirical formula calculation results. In this paper, the internal labyrinth seal a full three-dimensional flow field analysis, the total pressure of the entrance and the entrance of a certain static pressure must both cases the flow field are analyzed and compared in both cases the role of the gas force on the rotor.
In addition, the paper also introduces user-defined function (UDF) the definition of the entrance of the total pressure, and a degree of calculation under large disturbance rotor dynamic characteristics of labyrinth seal coefficient method to force the gas into account the non-linear factors studied bias, and speed as well as the labyrinth seal pressure on the coefficient of dynamic characteristics. Fluid in the labyrinth seal flow process, to follow all the control of fluid flow equation.
Keywords:Labyrinth seal, FLUENT, Dynamic characteristics coefficient
