A quasi-two-dimensionai method for the rotordynamic analysis of centered labyrinth liquid seals

The work presents a method for analyzing the dynamic regime of labyrinth li quid seals. By using the traditional simplifying assumptions for the center ed seal (sinusoidal, harmonically varying, first order dynamic perturbation ), the approach call be addressed as "quasi" two-dimensional. A numerical c oordinate transformation capable to treat displacement perturbations is int roduced. The first order mathematical model is then deduced following the s ame steps as in a previously published work (Arghir and Frene, 1997b). From this standpoint, the present method call be regarded as an cc-tension of t he above mentioned approach which was able to deal only with stator-grooved seals. The method is validated by comparisons with Nordmann and Dietzen's (1988) theoretical results for a seal with grooves on both stator and rotor and with the experimental results of Staubli's (1993) test case concerning a general seal.