基于流固耦合的多油楔滑动轴承动特性研究

摘要/Abstract

摘要：

提出了适用于多油楔滑动轴承结构的动网格方法，并实现了轴颈任意扰动（自由振荡运动、脉冲激励运动和偏心涡动）下润滑流场的瞬态计算。通过在润滑流场与转子系统间进行数据传递，形成了多油楔滑动轴承润滑流场与转子动力学之间的耦合计算。讨论了轴颈自由振荡、受脉冲激励以及偏心涡动时轴瓦安装角对多油楔滑动轴承动特性的影响，数值计算表明：当安装角设置在20°~40°之间时，轴承的阻尼较小，稳定性较差;而当轴瓦安装角在100°~120°之间时，轴承阻尼较大，稳定性较好，并且轴瓦数越多，安装角对稳定性的影响越小。

关键词: 多油楔滑动轴承, 计算流体动力学, 安装角, 动特性, 流固耦合

Abstract: A new mesh movement approach used for multi-wedge journal bearings was proposed, and the unsteady flow fields were calculated under arbitrary perturbations of journal (free oscillation motions, plus excitation motions, and eccentric whirls). A coupling calculation between the oil film in multi-wedge journal bearings and rotor dynamics was realized by transferring data between two domains. When the journals freely oscillated, excited by pulses, and eccentrically whirled, the influences of bearing installation angle on the dynamic characteristics of multi-wedge journal bearing were discussed. The calculation results indicate that the multi-wedge journal bearings have small damping and poor stability when the bearing installation angles are changed in the ranges of 20°~40°, and the multi-wedge journal bearings have large damping and good stability when the bearing installation angles are changed in the ranges of 100°~120°. Moreover, with the increase of the bearing numbers, the installation angle has less effects on the stability.

Key words: multi-wedge journal bearing, computational fluid dynamics(CFD), installation angle, dynamic characteristic, fluid-structure coupling

中图分类号:

TH133

李强, 张硕, 马龙, 许伟伟, 郑水英. 基于流固耦合的多油楔滑动轴承动特性研究[J]. 中国机械工程.

LI QiangZHANG ShuoMA LongXU WeiweiZHENG Shuiying. Research on Dynamic Characteristics of Multi-wedge Journal Bearing Based on Fluid-structure Coupling[J]. China Mechanical Engineering.

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