Analysis of dynamic characteristics of spiral groove liquid film seal considering taper and waviness

doi:10.11949/j.issn.0438-1157.20160693

Abstract

Abstract:

Sealing performance is significantly affected by the change of seal face topography produced by thermal and force deformation or machining. A mathematical model of spiral groove liquid film seal considering radial taper and circumferential waviness was established. The dynamic Reynolds equation was solved by partial derivative method and the opening force, stiffness, dynamic stiffness and dynamic damping coefficients of liquid film seal were obtained by means of finite element method, and then the influence of radial taper and circumferential waviness on steady and dynamic characteristics of liquid film seal were analyzed. The results indicated that the opening force of liquid film seal decreased with the increase of taper and increased with the increase of waviness amplitude. Under the same waviness amplitude, the opening force was reduced with the increase of waviness number. Stiffness of liquid film gradually reduced with the increase of taper and the variation trend with waviness amplitude was different with the change of waviness number. The absolute values of dynamic stiffness coefficients of liquid film decreased with the increase of taper and the effects of waviness on axial stiffness coefficient and angular stiffness coefficients were more obvious. Dynamic damping coefficients of liquid film gradually decreased with increasing taper and increased with increasing of waviness amplitude.

Key words: liquid film seal, dynamic characteristics, taper, waviness, partial derivative method, finite element method

摘要：

密封端面因热力变形或机械加工产生的形貌变化显著影响密封性能。建立考虑径向锥度和周向波度的螺旋槽液膜密封数学模型，利用偏导数法求解动态雷诺方程，并采用有限元法计算液膜密封开启力、刚度、动态刚度及阻尼系数，进而分析了径向锥度及周向波度对液膜密封稳、动态特性的影响。结果表明：液膜密封开启力随着锥度的增加逐渐减小，随着波幅的增加逐渐变大，同一波幅下，波数增多，开启力减小；液膜刚度随着锥度的增加逐渐减小，且波数不同时随波幅的变化趋势不同；液膜动态刚度系数绝对值随锥度的增加逐渐减小，轴向刚度系数和角向刚度系数受波度的影响比较明显；液膜动态阻尼系数随锥度的增加逐渐减小，随波幅的增加逐渐变大。

关键词: 液膜密封, 动态特性, 锥度, 波度, 偏导数法, 有限元法

CLC Number:

TH117.2

YANG Wenjing, HAO Muming, LI Zhentao, REN Baojie, CAO Hengchao, ZHANG Wei. Analysis of dynamic characteristics of spiral groove liquid film seal considering taper and waviness[J]. CIESC Journal, 2016, 67(12): 5199-5207.

杨文静, 郝木明, 李振涛, 任宝杰, 曹恒超, 张伟. 考虑锥度及波度的螺旋槽液膜密封动态特性分析[J]. 化工学报, 2016, 67(12): 5199-5207.

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