旋转圆柱微间隙剪切流动特性研究  

Study on rotational shear flow characteristics in a narrow annular channel

作　　者：朱桂平[1] 马兆坤 郭义盼 张镜洋[1] Zhu Guiping;Ma Zhaokun;Guo Yipan;Zhang Jingyang(College of Astronautics,Nanjing University of Aeronautics and Astronautics,Jiangsu Nanjing,210016,China)

机构地区：[1]南京航空航天大学航天学院,江苏南京210016

出　　处：《机械设计与制造工程》2022年第9期45-52,共8页Machine Design and Manufacturing Engineering

基　　金：航空科学基金资助项目(201928052008);江苏省自然科学基金青年项目(BK20180419);国家自然科学基金青年项目(11905105)。

摘　　要：以动压气体轴承间隙内流动为背景,研究旋转圆柱微间隙剪切流动特性,采用有限体积法对内壁高速旋转的两圆柱间隙内流动特性进行分析,讨论偏心率、间隙比和转速等因素对压力和速度分布的影响,同时分析通道内泰勒-库特流动规律,及泰勒涡对速度分布产生的影响。结果表明,偏心率或转速的增加以及间隙比的减小,使得压力绝对值上升,压力极值点随着偏心率的增加向最小气膜间隙处移动;偏心率高于0.3时,间隙内出现流动分离形成回流,当偏心率增高至0.8时,回流区周向角度占比达到0.73;泰勒涡的出现使间隙内速度产生波状分布,切向速度最低减至0。分析结果可为了解动压气体轴承内部工作机理提供指导和依据。Based on the flow in the clearance of hydrodynamic gas bearings,the shear flow characteristics of rotating cylinders in the clearance are studied.The flow characteristics in the clearance between two cylinders rotating at high speed are analyzed by the finite volume method.The influences of eccentricity,clearance ratio and rotational speed on the pressure and velocity distribution are discussed.In addition,the influence of Taylor-Couette flow is analyzed on velocity distribution.The absolute value of pressure increases with the rise of eccentricity or rotational speed,but with the decline of the clearance ratio.The location of the extreme pressure moves to the minimum thickness with the increase of eccentricity.With the eccentricity higher than 0.3,flow separation exhibits with backflow formed.Upon eccentricity reaching 0.8,the proportion of circumferential angle reaches 0.73.Furthermore,the appearance of Taylor vortex makes the velocity produce wavy distribution and tangential velocity decrease to 0.The analysis on the rotating shear flow characteristics of the micro-clearance provides guidance and basis for understanding the internal working mechanism of the dynamic gas bearing.

关 键 词：旋转圆柱 微间隙 剪切流动 偏心率 间隙比 转速 

分 类 号：TK05[动力工程及工程热物理]