迷宫密封结构与动力学参数影响因素

Effect research of labyrinth seal structure and dynamics parameters

摘要:

针对迷宫密封一转子系统的特点，建立密封一转子系统动力学模型，分析转速、入口预旋比、密封间 隙、压差等重要密封参数对密封动力学特性系数的影响．对三维模型的流体动力学( CFD)进行分析，总结出 密封结构和压差对泄漏量的变化规律，并通过与实验的对比分析验证了本方法的正确性．研究结果表明：减 小密封入口预旋速度，适当增大密封间隙，可以减小引起不稳定的交叉刚度系数，提高稳定性．齿宽存在一个 临界值(1. 04 mm)，高于这个临界值时，随着齿宽变大泄漏量变大；低于这个临界值时，随着齿宽变大泄漏量 变小．在相同转速下，随着密封间隙的增大泄漏量增大，压差增大泄漏量增大，腔深增大泄漏量减小

Abstract:

Numerical method is used for solving rotor-seal nonlinear dynamics equation, so that the dynamics effects of whirl speed, pre-whirl, labyrinth seal gap, pressure are investigated, and the leakage effects of seal gap, pressure, labyrinth seal structure are researched. The numerical method is verified to be correct by ex- periments. The results show that reducing pre-whirl and increasing seal gap can reduce the cross-stiffness coef- ficients, and improve stability purposes. There is a critical value of tooth width l. 04 mm, the leakage seal in- creases with the increasing of tooth width when it is more than the critical value, and the leakage seal decrea- ses with the increasing of tooth width when it is less than the critical value. At the same whirl speed, the leak- age increases with the increase of labyrinth seal and pressure, and decreases with the decrease of cavity depth