A REVIEW OF MODERN ROTOR/SEAL DYNAMICS

A review of rotor/seal dynamics is given,focusing on the problems,contents,and main results achieved in modern rotor/seal dynamics.Researches of modern rotor/seal dynamics are divided into four parts:1) modeling and calculation methods of the seal force;2) identification of the eight lumped parameters of the seal force(the eight dynamic coefficients of the seal);3) effect of different structure of seals(including damp-reduced structure and pre-swirl) on rotor stability;and 4) modeling and analysis of rotor/seal dynamic,especially the nonlinear dynamics of the rotor/seal model.The achieved main results are summarized as follows:1) proposing the lumped parameter seal force model by Muszynska and Bently;2) obtaining some techniques to identify the lumped parameters of the seal force;3) studying some complex behaviors including bifurcation and chaos on some simple rotor/seal models;and 4) applying CFD(Computational Fluid Dynamics) to seal force calculation and rotor/seal dynamic analysis.Over one hundred of references are listed at the end of the paper.This review will be helpful for researchers of rotor/seal dynamics.