圆柱管排流体诱导振动及换热特性数值分析  

Numerical Analysis of the Cylindrical Tube Bank Fluid-induced Vibration and Heat Exchange Characteristics

作　　者：宿艳彩[1] 葛培琪[1] 闫柯[1] 

机构地区：[1]山东大学机械工程学院,山东济南250061

出　　处：《热能动力工程》2012年第5期554-559,623,共6页Journal of Engineering for Thermal Energy and Power

基　　金：国家重点基础研究发展规划(973计划)基金资助项目(2007CB206900);山东大学自主创新基金资助项目(31360070613218)

摘　　要：基于Workbench和CFX模拟技术对流体诱导不同间距(L=1.5 d、3.5 d、4.5 d和5 d)顺排和叉排圆柱振动及换热特性进行了数值分析。研究结果表明:流体诱导顺排圆柱振动,其圆柱间距存在一个临界值L=3.5 d,当间距小于3.5 d,随着间距的减小,下游圆柱振动的幅值和频率减小;当间距大于3.5 d,下游圆柱的振动频率不再随着间距的增大而变化;下游圆柱处于上游圆柱的尾流涡尾部时,振动幅值较小,但圆柱侧面平均换热效果较佳。同工况同间距下,流体诱导顺排圆柱下游圆柱的振动幅值和频率大于叉排圆柱下游圆柱的振动幅值。当L>3.5 d时,流体诱导顺排圆柱下游圆柱的换热效果优于叉排圆柱下游圆柱的换热效果。Based on the Workbench and CFX simulation technology,numerically analyzed were the fluid-induced lined and staggered cylindrical tube vibration at various intervals and heat exchange characteristics.The research results show that within the range of the study,the fluid induces the lined cylindrical tube vibration and there exists a critical value of the cylindrical tube interval L1=3.5 d.When the interval is less than L1,the downstream cylindrical tube vibration amplitude and frequency will decrease with a decrease of the interval.When the interval is bigger than L1,the downstream cylindrical tube vibration frequency will no longer change with an increase of the interval.When the downstream cylindrical tube is located in the tail portion of the wake vortex caused by the upstream cylindrical tube,the vibration amplitude is relatively small and the area-averaged heat exchange effectiveness is relatively good.Under a same operating condition and at an identical interval,the fluid-induced downstream lined cylindrical tube vibration amplitude and frequency are bigger than the staggered cylindrical tube vibration amplitude and frequency.In a certain range of the interval,the heat exchange effectiveness of the fluid-induced downstream lined cylindrical tubes is superior to that of the staggered ones.

关 键 词：顺排圆柱 叉排圆柱 涡激振动 振动换热 

分 类 号：TK124[动力工程及工程热物理—工程热物理]