周向发散式袋型阻尼密封泄漏特性与动力特性数值研究

提出一种周向发散式袋型阻尼密封结构,建立了袋型阻尼密封多频椭圆涡动求解模型,在实验验证求解模型准确性的基础上,研究了进出口压比、偏心率对袋型阻尼密封泄漏特性与动力特性的影响,分析了两种袋型阻尼密封的转子稳定性.结果表明:两种袋型阻尼密封的泄漏量平均相差0.89％,两者泄漏特性相当.传统袋型阻尼密封在转子偏心状态时各腔室...

Numerical study on leakage and dynamic characteristics of circumferentially divergent pocket damping seal

A type of circumferentially divergent pocket damping seal structure was proposed，the pocket damping seal multi-frequency elliptical vortex solution model was established，and based on the experimental verification of the accuracy of the pocket damping seal solution model，the effects of the inlet and outlet pressure ratio and eccentricity on the leakage characteristics and dynamic characteristics of pocket damping seal were studied，and the rotor stability of the pocket damping seals was analyzed.The research results showed that the difference in leakage between two pocket damping seals was 0.89% on average，and the leakage characteristics of these two were equivalent.The traditional pocket damping seal had a large circumferential pressure difference in each chamber when the rotor was eccentric，while the pressure distribution in each chamber of the circumferentially divergent pocket damping seal was basically uniform； the tangential airflow force of these two was opposite to the direction of the rotor whirl，and both suppressed the vortex of the rotor，and the tangential air force of the circumferentially divergent pocket damping seal was 2.29 times that of the traditional pocket damping seal；the average effective stiffness of the circumferentially divergent pocket damping seal was 1.29 times that of the traditional pocket damping seal，the circumferentially divergent pocket damping seal was more conducive to the stability of the rotor system.