北京航空航天大学学报 ›› 2011, Vol. 37 ›› Issue (1): 6-9,35.

• 论文 • 上一篇    下一篇

气膜密封阻尼结构的气膜稳态特性分析

洪杰, 王虹, 马艳红   

  1. 北京航空航天大学 能源与动力工程学院, 北京 100191
  • 收稿日期:2009-11-25 出版日期:2011-01-31 发布日期:2011-01-28
  • 作者简介:洪 杰(1965-),男,北京人,教授,hongjie@buaa.edu.cn.
  • 基金资助:

    航空基金资助项目(2006ZB51028); 凡舟青年科研基金资助项目(20060403)

Analysis on gas film stability performance of gas film seal damper

Hong Jie, Wang Hong, Ma Yanhong   

  1. School of Jet Propulsion, Beijing University of Aeronautics and Astronautics, Beijing 100191, China
  • Received:2009-11-25 Online:2011-01-31 Published:2011-01-28

摘要: 针对航空发动机等高速旋转机械的气体动密封和转子系统的振动问题,提出一种新型的带金属橡胶弹性外环的气膜密封阻尼结构,其作用是在转静子之间建立气膜用于阻尼和封严,高弹性阻尼材料的外环用于控制气膜的动力特征.基于准静态法建立转子-气膜-金属橡胶外环三者之间的流固耦合关系,采用有限差分法求解气膜压力场,得到表征气膜密封阻尼结构稳态特性的气膜力、泄漏量和摩擦转矩随参数变化的规律.计算结果表明:弹性外环能有效地改善气膜压力场的分布.具有良好稳态性能的结构参数选取范围应结合实际工况确定.在给定的工况条件下,长径比取1.5,密封间隙取0.05mm,柔性系数在2左右为佳.

Abstract: In order to solve the problem of gas dynamic seal and vibration of rotor system in high-speed rotating machinery, a novel gas film seal damper (GFSD) with flexible metal rubber ring was brought forward. The function of gas film between the stator and rotor is seal and damping while the high elasticity ring can control the dynamic property of gas film. The quasi-static method was employed to describe the fluid-solid coupling among rotor, gas film and metal rubber ring. Based on finite difference method, the gas film pressure field was analyzed, and the effects of the structural and working parameters on the stability performance of GFSD, including gas film force, leakage and friction torque, were discussed. The results show that the flexible ring can improve gas film pressure field effectively. The proper range of structural parameters is defined by the actual working conditions. With the given working parameters, a better stability property will obtain with the ratio of width and diameter 1.5, the seal clearance 0.05mm and the flexible coefficient around 2.

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