LABYRINTH SEALS DYNAMIC COEFFICIENTS AND CRITICAL SPEED RESEARCH BASED ON CHILDS'MODEL

摘要

Mathematical method are used to calculate the dynamic coefficients and Critical of labyrinth seals. It is important to know the accurate dynamic coefficients of labyrinth seals for predicting the instability of the rotor-seal system. Labyrinth seal dynamic coefficients at different radial clearances, pre-swirl ratios, rotor speeds, seal lengths and diameters are presented in this paper. Critical speed at different seal length and diameters are also studied in this paper.