低温工况润滑脂流变特性及本构方程研究

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英文篇名：Research on Lubricating Grease Rheological Properties and Constitutive Equations at Low Temperature Conditions 作者：晏飞 ; 王子昱 ; 刘珊 英文作者：YAN Fei;WANG Zi-yu;LIU Shan;School of Mechanical Engineering,Jiangsu University of Science and Technology; 关键词：本构方程 ; 润滑脂 ; 流变特性 ; 压力损失 ; 粘度分布 ; 速度分布 ; 低温工况 英文关键词：Constitutive Equations;;Lubricating Grease;;Rheological Property;;Pressure Drop;;Viscosity Distribution;;Velocity Distribution;;Low Temperature Conditions 中文刊名：JSYZ 英文刊名：Machinery Design & Manufacture 机构：江苏科技大学机械工程学院; 出版日期：2019-07-08 出版单位：机械设计与制造 年：2019 期：No.341 基金：江苏省自然科学基金(BK20140512);; 教育部留学回国人员科研启动项目 语种：中文; 页：JSYZ201907031 页数：4 CN：07 ISSN：21-1140/TH 分类号：123-126

摘要

润滑脂流变学行为与温度紧密相关,而流变行为决定润滑脂的本构方程。首先分别在不同温度工况下进行流变试验获得润滑脂流变学特性,并对低温工况进行研究;其次,基于Herschel-Bulkley、Power Law与Bingham本构方程对流变数据进行回归分析;最后,基于三种本构方程采用CFD方法深入分析润滑脂在管内的压力损失、粘度分布及速度分布规律。结果表明:在低剪切速率下,低温工况的剪切应力出现峰值,且润滑脂承受的最大剪切速率减小;不同工作温度下,三种本构方程回归精度均大于92%;Herschel-Bulkley本构方程粘度与速度计算结果均小于Power Law与Bingham本构方程;基于三种本构方程计算的速度在管道中心均出现明显的核流区域;Herschel-Bulkley本构方程压降计算结果最小。
        The rheological properties which determines the lubricating grease rheological model is effected by temperature significantly. The rheological property under different temperature of lubricating grease is investigated using rotational rheometer firstly,and the rheological properties of greases are analyzed under low temperature;Secondly,the rheological data are regression studied based on the Herschel-Bulkley,Power Law and Bingham constitutive equations;Eventually,based on the three rheological models,the pressure drop,viscosity and velocity distribution are investigated by CFD. The results show that there is a largest shear stress under low temperature,and with decreasing the temperature,the maximum shear rate that the grease can bear is decreasing;the regression accuracy based on the three constitutive equations is greater than 92% under different temperatures;the viscosity and velocity calculated by Herschel-Bulkley rheological model are lower than the value simulated with Power Law and Bingham rheological models,and there has an obviously the plug flow region in the pipe center based on different rheological models;the pressure drop calculated by Herschel-Bulkley rheological model is minimum.

引文

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