带螺旋折流板的中空换热器振动和传热特性分析  

Vibration and heat transfer performances analysis of a hollow helical baffle heat exchanger

作　　者：孙亚茹 季家东 华子森 王成军[1] 王艳[1] SUN Yaru;JI Jiadong;HUA Zisen;WANG Chengjun;WANG Yan(School of Artificial Intelligence,Anhui University of Science&Technology,Huainan 232001,China;School of Mechanical Engineering,Anhui University of Science&Technology,Huainan 232001,China)

机构地区：[1]安徽理工大学人工智能学院,安徽淮南232001 [2]安徽理工大学机械工程学院,安徽淮南232001

出　　处：《振动与冲击》2023年第8期251-258,共8页Journal of Vibration and Shock

基　　金：国家自然科学基金面上项目(52175070);安徽省自然科学基金面上项目(1908085ME160);安徽省重点研究与开发计划项目(201904a05020092);安徽理工大学校级基金项目(xjyb2020-12)。

摘　　要：为改进换热器内螺旋传热元件的振动均匀性及提高换热器的综合传热性能,提出一种带有螺旋折流板(hollow helical baffle,HHB)的中空换热器,采用双向流固耦合计算方法,研究了入口流速及折流板安装位置对换热器振动及传热特性的影响。结果表明:带螺旋折流板的中空换热器可有效均衡振动特性,提高传热特性;增加入口流速,传热元件振动幅值和换热系数增大;折流板安装在换热器上部时,平均振动幅值最大,平均传热系数最小,传热均匀性最好;带螺旋折流板中空换热器的PEC(performance evaluation criteria)值大于1,实现了强化传热的效果,折流板安装在换热器的下部、上部、左部和右部时换热器的PEC值比传统螺旋弹性管束换热器的PEC值分别提高了2.04%,7.87%,1.32%和0.03%,折流板安装在上部时PEC值最大,综合传热性能最好。A hollow helical baffle(HHB)heat exchanger was put forward to balance the vibration performance and improve the heat transfer performance of helical heat transfer elements.A fluid-solid coupling method was provided to study the effects of entrance velocity and the installed position of baffle on the performances of vibration and the heat transfer.Based on the numerical results,the HHB heat exchanger can effectively balance the vibration performance and improve the heat transfer performance.The vibration amplitude and heat transfer coefficient of heat transfer elements increase with entrance velocity.It was found that when the baffle is installed on the top side of the heat exchanger,the average vibration amplitude is the biggest,the average heat transfer coefficient is the smallest and the heat transfer uniformity is the best.The PEC value of HHB heat exchanger is always bigger than 1,which shows that the HHB heat exchanger has achieved the effect of enhancing the heat transfer.When the baffle is installed on the bottom,top,left,and right side of the HHB heat exchanger,the performance evaluation criteria(PEC)value of the HHB heat exchanger can be increased by 2.04%,7.87%,1.32%,and 0.03%compared with that of the conventional elastic tube bundle,respectively.When the baffle is installed on the top side of the HHB heat transfer,the PEC value is the maximum and the comprehensive heat transfer performance is the best.

关 键 词：传热元件 换热器 螺旋折流板 振动特性 传热特性 

分 类 号：TH123[机械工程—机械设计及理论] TK172[动力工程及工程热物理—热能工程]