Abstract: The exciting forces produced by the fluid flowing through a labyrinth seal is one of the important sources, which would cause the large seale turbine sets to lase its stabllity. While evaluating the stability of a rotor system, the dynamic characteristic one[1]cionts are those of the most important parameters. Paper studied the dynamic characteristic coefficients of labyrinth seals from both theoretical and experimental sides and achleved a new theoretical calculating method. Experiments showed that, using this theoretical calculating method can get results almost the same as what the experiments got. By analysing the effects of relating parameters on those dynamic characteristic coefficients, we found some remedies for preventing the generation or restraining the magnitude of the fluid exciting forces within a labyrinth seal.

Key words: 动力特性, 迷宫密封