偏心率和转速对迷宫密封力和动力学参数影响分析研究

An analytical study of the effect of different eccentricity and whirling speed on labyrinth seal forces and dynamics parameters

通过数值方法和商用CFD(计算流体动力学)软件对密封-转子系统进行建模和求解,研究了5种偏心率和5种转速下的计算机求解时间、流场压力分布、密封力的变化情况,并对泄漏量影响分析和迷宫密封动力学参数影响进行分析研究。研究结果表明:该方法能较好地模拟计算迷宫密封泄漏量和动力学参数,得到腔室压力随着偏心率增大而增大,密封切向力随着偏心率、转速的增大而增大,密封径向力随着偏心率、转速的增大而负向增大;通过密封长度、密封间隙、密封压差对泄漏量影响计算,三者变化率分别为6.62%,65.21%和69.97%,表明密封间隙和压差变化是影响泄漏量变化的重要影响因素;通过密封压差和密封长度对动力学参数影响分析,得出增大密封压差和密封长度不利于系统稳定、增大密封间隙会使得系统趋于稳定。

Modeling and calculation are performed for labyrinth seal-rotor system by using numerical methods and commercial CFD（Computational Fluid Dynamics） software.The time spent for computer calculation,pressure distribution in flow field and labyrinth seal forces under five different eccentricities and whirling speeds are researched,respectively.The effects on labyrinth seal leakage and dynamics parameters are also studied by numerical methods.The results show that the method can preferably simulate labyrinth seal leakage and dynamics parameters under different conditions.It gets that pressure and labyrinth seal force increase with eccentricity,and tangential labyrinth seal force increase with eccentricity and whirling speed,while its normal one does in negative direction.Leakage influencing change rate of seal length and gap,sealing pressure difference are 6.62%,65.21% and 69.97%,respectively,indicating that seals gap and its pressure difference are important impact factors to leakage.Increasing labyrinth seal pressure difference and seal length is not beneficial to seal-rotor system stability,while increasing the seal gap would be good for it.