A comparative study on rotordynamics characteristics of hole-pattern damping seals with different cavity shapes

IF 1.5 4区工程技术 Q3 ENGINEERING, MECHANICAL Industrial Lubrication and Tribology Pub Date : 2024-07-29 DOI:10.1108/ilt-04-2024-0127

Xuan Zhang, Jin-Bo Jiang, Xudong Peng, Zhongjin Ni, Jun Pan

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Abstract

Purpose

The purpose of this paper is to improve the seal performance by proper design of the cavity shape of the damping holes, especially the rotordynamics characteristics of the hole-pattern damped seal (HPDS).

Design/methodology/approach

A new damping seal structure that comprises a circle-shaped cavity and two directional leaf-shaped cavities with a dovetail-shaped diversion groove is proposed. The comparative study on the sealing characteristics of dovetail-shape, leaf-shape and classical circular HPDSs was carried out using ANSYS CFX.

Findings

The dovetail-shaped HPDS significantly outperformed two other damping seal designs in leakage and rotordynamic performance. At a rotating speed of 7,500 rpm, it showed a 25% reduction in leakage, a 23% increase in average effective damping and a 119% increase in average effective stiffness. The cross-coupled stiffness K_xy shifted from positive to negative, reducing circumferential flow. The dovetail's inclined leaf-shaped grooves create a double vortex that slows jet velocity in the seal clearance and alters spiral flow direction, resulting in a uniform pressure distribution and enhanced rotor stability at low frequencies.

Originality/value

This study proposes a novel HPDS with dovetail-shaped diversion grooves. The seal can realize the simultaneous improvement of rotordynamics and leakage characteristics compared to the current seal structure.

Peer review

The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-04-2024-0127/

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不同空腔形状的孔型阻尼密封件旋转动力学特性比较研究

本文的目的是通过合理设计阻尼孔的空腔形状来提高密封性能，尤其是孔型阻尼密封（HPDS）的旋转动力学特性。本文提出了一种新型阻尼密封结构，它由一个圆形空腔和两个带有燕尾形分流槽的定向叶形空腔组成。利用 ANSYS CFX 对燕尾形、叶形和传统圆形 HPDS 的密封特性进行了比较研究。研究结果燕尾形 HPDS 在泄漏和旋转动力学性能方面明显优于其他两种阻尼密封设计。在转速为 7500 rpm 时，它的泄漏量减少了 25%，平均有效阻尼增加了 23%，平均有效刚度增加了 119%。交叉耦合刚度 Kxy 从正值变为负值，减少了周向流动。燕尾形的倾斜叶形凹槽产生了双重漩涡，减缓了密封间隙中的喷射速度，并改变了螺旋流动方向，从而实现了均匀的压力分布，增强了转子在低频下的稳定性。与目前的密封结构相比，该密封可实现旋转动力学和泄漏特性的同步改善。同行评议本文的同行评议记录可在以下网址查阅：https://publons.com/publon/10.1108/ILT-04-2024-0127/。

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来源期刊

Industrial Lubrication and Tribology 工程技术-工程：机械

CiteScore

3.00

自引率

18.80%

发文量

129

审稿时长

1.9 months

期刊介绍： Industrial Lubrication and Tribology provides a broad coverage of the materials and techniques employed in tribology. It contains a firm technical news element which brings together and promotes best practice in the three disciplines of tribology, which comprise lubrication, wear and friction. ILT also follows the progress of research into advanced lubricants, bearings, seals, gears and related machinery parts, as well as materials selection. A double-blind peer review process involving the editor and other subject experts ensures the content''s validity and relevance.