摘要
船用艉轴承常用高分子材料作为工作表面,润滑油在其与高分子材料的界面处具有极限剪应力,因此在高剪切工况下易发生界面滑移。同时,大型重载艉轴承偏心率较大,最大膜厚往往远大于最小膜厚,膜厚较大的区域可能发生局部紊流。为研究界面滑移和紊流对轴承性能的影响,本文提出一种考虑界面滑移和紊流的轴承分析模型,建立数值仿真流程,在此基础上分析界面滑移、局部紊流及两因素的耦合对轴承性能的影响。分析结果表明:界面滑移会降低轴承承载能力,减小最小膜厚,同时减小摩擦力;局部紊流则会提高液膜承载能力,增大其最小液膜厚度及摩擦系数;综合考虑两因素影响时,低速下界面滑移的影响占主导,随着转速升高,局部紊流对液膜厚度及摩擦系数的增大作用逐渐增强,逐步抵消界面滑移引起的液膜厚度及摩擦系数的减小。
Polymer materials are often used as the surface of marine stern tube bearings.Lubricating oil has limit shear stress on the polymer material surface,so wall slip may occur under a high shear condition.More-over,the eccentricity of a large heavy-duty stern tube bearing is large,so the liquid in the area around the minimum film thickness is laminar flow,and the local turbulence may occur in other areaa with a larger film thickness.In this paper,a lubrication model considering wall slip and turbulence was proposed,and the cor-responding numerical procedure was established.Based on the proposed model,the influence of wall slip and local turbulence on the performance of a marine stern tube bearing was analyzed.The results show that wall slip reduces the load-carrying capacity and decreases the minimum film thickness and the friction force,while local turbulence increases the load-carrying capacity,the minimum liquid film thickness and the fric-tion force.When the two factors are considered at low speed,the influence of wall slip on the bearing perfor-mance is dominant.With the increase of speed,the effect of local turbulence on the film thickness and fric-tion coefficient gradually increases,which gradually counteracts the decreasing of the film thickness and fric-tion coefficient due to wall slip.
作者
吕芳蕊
张鑫杰
饶柱石
郑胜尧
施俊杰
LÜFang-rui;ZHANG Xin-jie;RAO Zhu-shi;ZHENG Sheng-yao;SHI Jun-jie(School of Mechanical and Eletrical Engineering,Hohai University,Changzhou 213022,China;State Key Laboratory of Mechanical System and Vibration,Shock and Noise,Shanghai Jiao Tong University,Shanghai 200240,China;Institute of Vibration,Shock and Noise,Shanghai Jiao Tong University,Shanghai 200240,China)
出处
《船舶力学》
EI
CSCD
北大核心
2023年第9期1304-1314,共11页
Journal of Ship Mechanics
基金
国家自然科学基金资助项目(12002117)
上海交通大学振动、冲击、噪声实验室资助项目(VSN202201)
常州市科技计划资助项目(CJ20200072)。
关键词
界面滑移
紊流
轴颈倾斜
润滑特性
船用艉轴承
wall slip
turbulence
journal misalignment
lubrication characteristics
marine stern tube bearing
