迷宫密封的存在会引起汽流激振,密封的结构和工况参数对转子动力特性均存在影响.该文综合分析转子转速、人口预旋比、密封间隙、压差等因素对转子动力特性系数的影响,为迷宫密封汽流激振的防治和设计中各参数的最优确定提供参考依据.“,”Labynnth seals induce steam-excited vibration, its structure and operating parameters both effect rotor - dynamic coefficients . This paper discusses influences of a series of factors on dynamic coefficients of rotor system, such as rotor speed, recircularing velocity ratio on entry, clearance, pressure difference. It provides basis law for prevention and treatment of steam- excited vibration and optimum determination of design parameters of labyrinth seals.