Taylor-Couette波状涡流场环隙波动的变化特征  

Fluctuation Characteristics of Wavy Vortex Field Within Annular Gap in Taylor-Couette

作　　者：毛玉红[1,2] 陈超 李亚蓉 付海煜 MAO Yuhong;CHEN Chao;LI Yarong;FU Haiyu(School of Environmental and Municipal Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China;Ministry of Education Engineering Research Center of Water Resource Comprehensive Utilization in Cold and Arid Regions,Lanzhou Jiaotong University,Lanzhou 730070,China)

机构地区：[1]兰州交通大学环境与市政工程学院,甘肃兰州730070 [2]兰州交通大学寒旱地区水资源综合利用教育部工程研究中心,甘肃兰州730070

出　　处：《西南交通大学学报》2025年第2期425-433,共9页Journal of Southwest Jiaotong University

基　　金：国家自然科学基金项目(51968038,51468029);甘肃省重点研发计划(23YFGA0048);甘肃省教育厅高校科研创新平台重大培育项目(2024CXPT-14)。

摘　　要：为研究Taylor-Couette环隙流场波状涡涡间的波动变化情况,采用大涡模拟(LES)方法对Taylor-Couette波状涡流场进行瞬态数值模拟,并从二维和三维的角度对环隙间波状涡流场进行分析.结果表明:波状涡流场中二维环隙子午面速度矢量场存在周期性波动变化特征,在周期始末时刻速度矢量场基本保持一致;涡交界位置处的轴向速度方向在不断发生周期性变化,径向和切向速度方向保持不变;涡对间各向速度值均大于涡对内的涡间,主流液体传递主要发生在外向流的涡对间;另一方面,三维波状涡流场涡旋周期波动现象明显,也具有周期特征,各工况(10、20、30、40 r/min)的周期分别为12.94、6.80、1.93、1.49 s;随着旋转雷诺数增大,涡旋波动幅度大幅减小,波动周期也缩短;环隙间主流液体在涡间的周期性流动带动流体微团在环隙间绕内筒做螺旋偶合涡旋转运动.The large eddy simulation(LES)method was applied to transiently simulate the wavy vortex field within the annular gap in Taylor-Couette and investigate the variation of fluctuations between wavy vortices.The wavy vortex field within the annulus gap was investigated from both two-dimensional and three-dimensional perspectives.The results indicate that the velocity vector field on the meridian plane of the two-dimensional wavy vortex field within the annular gap exhibits periodic fluctuation characteristics.The velocity vector field remains essentially the same at the beginning and end moments of the cycle.The axial velocity direction at the vortex junction changes constantly and periodically,while the radial and tangential velocity directions remain constant.The velocity values of the vortex pairs are greater than those of the vortex pairs inside the vortex,and the mainstream liquid transfer mainly occurs between the vortex pairs in the outward flow.Additionally,the fluctuation phenomenon of the three-dimensional wavy vortex field is clearly evident and exhibits periodic characteristics.The cycles for each working condition(10,20,30,and 40 r/min)are 12.94 seconds,6.80 seconds,1.93 seconds,and 1.49 seconds,respectively.With the increase in rotational Reynolds number,there is a significant decrease in vortex fluctuation amplitude and a reduction in the duration of fluctuations.The periodic flow transport of the mainstream liquid between vortices within the annulus gap propels fluid microclusters to perform a spiral-coupled vortex rotation around the inner cylinder within the annulus gap.

关 键 词：Taylor-Couette 波状涡 速度矢量场 环隙 波动特征 

分 类 号：TV131[水利工程—水力学及河流动力学]