Evaluation of the flow state and static performance of smooth annular liquid seals

IF 0.7 Q4 ENGINEERING, MECHANICAL
Zhongjie Yang, Jinyong Feng, Jingyu Wan, Xiaobin Yu, Zhang He, Wanfu Zhang
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引用次数: 0

Abstract

The static fluid-induced force and stiffness coefficient of the smooth annular seal directly affect the rotor system stability. In this paper, a computational fluid dynamics method is applied to investigate the flow characteristics of a smooth annular seal for various eccentricities, discharge/supply pressures and rotational speeds under different flow conditions (laminar, transition, and turbulent flow). The influence factors and formation mechanism of the static instability in the smooth annular liquid seal are analyzed. Results show that laminar flow dominates the flow state at a rotational speed of ω= 2000 rpm. As the rotational speeds increase, the transition flow (2000-7000 rpm) gradually transits to the turbulent regime (ω> 7000 rpm). The direct static stiffness decreases first and then increases from laminar to transition flow state, and the viscosity effect is the dominant factor. For transition and turbulent flow with high eccentricities (ε= 80 %), the dominant viscous effect and inertial effect lead to the negative radial force and negative direct static stiffness coefficients. The smooth annular liquid seal shows best performance in the laminar flow and worst performance in the turbulent flow.
光滑环形液体密封的流动状态和静态性能评价
光滑环形密封的静态流体诱导力和刚度系数直接影响转子系统的稳定性。在本文中,应用计算流体动力学方法研究了在不同流动条件(层流、过渡和湍流)下,光滑环形密封在各种偏心度、排放/供应压力和转速下的流动特性。分析了光滑环形液封静态失稳的影响因素及形成机理。结果表明,在ω=2000rpm的转速下,层流主导着流动状态。随着转速的增加,过渡流(2000-7000 rpm)逐渐过渡到湍流状态(ω>7000 rpm)。从层流状态到过渡流状态,直接静刚度先减小后增大,粘性效应是主要因素。对于具有高偏心率(ε=80%)的过渡和湍流,主要的粘性效应和惯性效应导致负径向力和负直接静态刚度系数。光滑环形液体密封在层流中表现出最佳性能,在湍流中表现出最差性能。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Journal of Vibroengineering
Journal of Vibroengineering 工程技术-工程:机械
CiteScore
1.70
自引率
0.00%
发文量
97
审稿时长
4.5 months
期刊介绍: Journal of VIBROENGINEERING (JVE) ISSN 1392-8716 is a prestigious peer reviewed International Journal specializing in theoretical and practical aspects of Vibration Engineering. It is indexed in ESCI and other major databases. Published every 1.5 months (8 times yearly), the journal attracts attention from the International Engineering Community.
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