Purpose

The purpose of this paper is to enhance sealing and rotordynamic performance of hole-pattern damping seal (HPDS) and labyrinth seal (LS) by structural innovation and geometrical optimization of special-shaped hole or annular-groove cavity.

Design/methodology/approach

The unsteady flow was transformed into steady one using moving reference frame method. The full period numerical models of LS and HPDS were established. The influence of special-shaped hole or annular-groove cavity at axial inclined angle on leakage rate and rotordynamic coefficient of these two seals at different whirl angular speed were investigated.

Findings

The results show that dynamic characteristics of straight-tooth LS are better than that of slanted-tooth LS. Compared to typical straight-hole damping seal, HPDS with windward oblique-hole when axial inclined angle ranges from 50 to 60° has superiority in both leakage and rotordynamic characteristics by considering smaller cross-coupled stiffness coefficient and whirl frequency ratio, larger direct damping coefficient and effective damping coefficient.

Originality/value

A novel HPDS with special-shaped three-dimensional hole cavity was proposed to enhance leakage and rotordynamic performance. The optimized geometrical structures of HPDS for excellent sealing and rotordynamic characteristics were obtained.

Peer review

The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-07-2020-0262/

中文翻译：

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迷宫式密封和带有异型3D腔的孔型阻尼密封的泄漏和转子动力学特性

目的

本文旨在通过异型孔或环形槽腔的结构创新和几何优化来增强孔型阻尼密封件（HPDS）和迷宫密封件（LS）的密封性能和转子动力学性能。

设计/方法/方法

使用移动参考系方法将非恒定流转换为稳定流。建立了LS和HPDS的全周期数值模型。研究了不同旋转角速度下，轴向倾斜角的异形孔或环形槽腔对这两个密封件的泄漏率和转子动力系数的影响。

发现

结果表明，直齿LS的动态特性优于斜齿LS。与典型的直孔阻尼密封相比，当轴向倾斜角为50至60°时，带有迎风斜孔的HPDS在泄漏和转子动力学特性方面均具有优势，因为考虑了较小的交叉耦合刚度系数和涡流频率比，较大的直接阻尼系数和有效的阻尼系数。

创意/价值

提出了一种新型的具有异型三维孔腔的HPDS，以增强泄漏和转子动力学性能。获得了具有出色密封性和转子动力学特性的HPDS优化几何结构。

同行评审

本文的同行评审历史记录可在以下网址获得：https://publons.com/publon/10.1108/ILT-07-2020-0262/