平面弹性管束疲劳强度与强化换热的数值分析  

Numerical Study on Fatigue Strength and Heat Transfer Enhancement of Planar Elastic Tube Bundle

作　　者：段德荣[1] 葛培琪[1,2] 毕文波[1] 王安民[1] 

机构地区：[1]山东大学机械工程学院,济南250061 [2]高效洁净机械制造教育部重点实验室,济南250061

出　　处：《工程热物理学报》2016年第12期2631-2637,共7页Journal of Engineering Thermophysics

基　　金：国家自然科学基金资助项目(No.51475268);国家重点基础研究发展"973"计划(No.2007CB206903)

摘　　要：为了保证平面弹性管束在满足疲劳强度的前提下实现强化换热,利用双向流固耦合的方法数值分析了入口速度为0.2~0.5 m·s^(-1)范围内弹性管束的流体诱导振动及强化换热。根据Mises准则分析了弹性管束的疲劳强度,利用PEC评价准则分析了弹性管束的综合换热性能。结果表明:在入口速度为0.2~0.5 m·s^(-1)范围内,管束危险部位主要集中在最内侧管束连接端,且满足管束疲劳强度。在流体诱导振动作用下,弹性管束的努塞尔数分别提高了8.26%,6.07%,5.67%和3.91%。入口速度为0.2和0.5 m.s^(-1)时,弹性管束的PEC值分别为1.08和1.03,二者的差异较小。弹性管束特有的复合弯曲梁结构使得内侧两根管束振动强度大于两侧管束,致使中间两根管束换热能力提高了21%,两侧管束换热能力提高了13%。This work numerically studied the flow-induced vibration and heat transfer enhancement of planar elastic tube bundle using two-way fluid structure interaction method in the range of inlet velocity 0.2-0.5 m·s^-1,to achieve the heat transfer enhancement under the premise of fatigue strength of tube bundle.The fatigue strength of elastic tube bundle was studied based on Mises criterion.The comprehensive heat transfer performance was studied using the performance evaluation criterion（PEC）.Results show that the danger point occurs at the connection end of the innermost tube in the range of inlet velocity 0.2-0.5 m·s^-1.However,the fatigue damage of tube bundle will not occur because the fatigue strength is satisfied.The Nusselt number is increased by 8.26%,6.07%,5.67%and 3.91%owing to the flow-induced vibration,respectively.There is little difference in PEC value between the inlet velocity 0.2 and 0.5 m·s^-1.The PEC value is 1.08 and 1.03,respectively.Because of the unique composite curved beam structure,the vibration intensity of middle two tubes is greater than that of two tubes on both sides,resulting in the heat transfer enhancement of 21%in the middle two tubes and 13%in the two tubes on both sides.

关 键 词：弹性管束 流固耦合 流体诱导振动 疲劳强度 强化换热 

分 类 号：TK123[动力工程及工程热物理—工程热物理] TK172[动力工程及工程热物理—热能工程]