新型双管程管壳式换热器的结构优化  

Structure Optimization of a New Type of Double Pass Shell and Tube Heat Exchanger

作　　者：徐义程 XU Yicheng(School of Mechanical Engineering,Anhui University of Technology,Maanshan 243002,China)

机构地区：[1]安徽工业大学机械工程学院,安徽马鞍山243002

出　　处：《惠州学院学报》2024年第6期59-66,共8页Journal of Huizhou University

摘　　要：针对新型双管程管壳式换热器,提出3种折流板优化方案,基于计算流体力学(CFD)软件,分析其在不同壳侧入口流速下的换热量、压降和综合性能指数EEC的变化特点,并结合场协同原理分析了壳程传热强化与降阻机理,得出最优性能折流板。研究结果表明,横流换热器的壳程流动死区较大,且横向冲刷换热管容易诱导管束振动;纵流换热器的壳程压降较大,导致EEC指数较小;螺旋流换热器的壳程流体混合得较为均匀,且综合性能指数随着流速的增长逐渐变大。单因素分析法和正交试验的结果均表明换热量和压降对折流板缺口率的变化更加敏感,研究内容可为新型换热器的结构开发与性能优化提供参考。Three optimization schemes for baffle plates are proposed for a new type of double-tube shell heat exchanger.Based on computational fluid dynamics(CFD)software,we analyze the changes in heat transfer,pressure drop,and comprehensive performance index under different inlet flow velocities on the shell side.Using the principle of field synergy,we analyze the heat transfer enhancement and drag reduction mechanisms on the shell side,thereby obtaining the optimal performance baffle plate.The research results indicate that the shell side flow dead zone of the cross-flow heat exchanger is relatively large,and lateral erosion of the heat exchange tubes can easily induce tube bundle vibration.The shell side pressure drop of the longitudinal flow heat exchanger is relatively high,resulting in a lower overall performance index.In contrast,the shell side fluid of the spiral flow heat exchanger is mixed more uniformly,and the comprehensive performance index gradually increases with the flow rate.The results of single-factor analysis and orthogonal experiments both show that heat transfer and pressure drop are more sensitive to changes in the baffle plate's notch ratio.This article's research content can provide a reference for the structural development and performance optimization of new heat exchangers.

关 键 词：管壳式换热器 强化传热 壳体流态 场协同 正交试验 

分 类 号：TK124[动力工程及工程热物理—工程热物理]