扭曲椭圆管换热器壳程强化传热的数值研究  

Numerical Study on Shell-Side Heat Transfer Enhancement of Twisted Oval Tube Heat Exchanger

作　　者：陈杭生 朱冬生[1,2] 陈二雄 莫逊[1,2] 谭连元 CHEN Hang-sheng;ZHU Dong-sheng;CHEN Er-xiong;MO Xun;TAN Lian-yuan(Guangzhou Institute of Energy Conversion,Chinese Academy of Sciences,Guangzhou 510640,China;CAS Key Laboratory of Renewable Energy,Guangzhou 510640,China;University of Chinese Academy of Sciences,Beijing 100049,China;Foshan Bulu Energy Saving Technology Co.,Ltd.,Foshan 528000,Guangdong,China)

机构地区：[1]中国科学院广州能源研究所,广州510640 [2]中国科学院可再生能源重点实验室,广州510640 [3]中国科学院大学,北京100049 [4]佛山市步鹿节能科技有限公司,广东佛山528000

出　　处：《新能源进展》2022年第6期519-525,共7页Advances in New and Renewable Energy

基　　金：2017年三水区创新人才团队项目;广东省企业科技特派员专项项目(GDKTP2021047200);广州市重点研发计划项目(202206010124);吉林省与中国科学院科技合作高技术产业化专项资金项目(2022SYHZ0027)。

摘　　要：基于扭曲椭圆管的换热器是一种新型的新风系统换热器,针对扭曲椭圆管及其应用特点,设计了两种不同结构参数的新风系统换热器。应用FLUENT软件,在夏季工况下对两种不同结构参数的新风系统换热器壳程进行模拟分析,并通过与实验数据的对比,验证计算模型的可靠性。结果显示在相同体积流量下,随着壳程开孔面积的增大,对流换热系数h不断减小,压降Δp不断减小,综合性能系数h/Δp^(1/3)变化不明显;随着螺距的减小,对流换热系数h不断增大,压降Δp不断增大,综合性能系数h/Δp^(1/3)也不断增大;流场分析显示,扭曲椭圆管换热器壳程流道内,呈现出明显沿着扭曲椭圆管壁面的螺旋流,使得空气在流道内充分扰动,增强换热效果。The heat exchanger based on a twisted oval tube is a new type of fresh air system heat exchanger.According to the characteristics of twisted oval tubes and their application,two kinds of fresh air system heat exchangers with different structural parameters were designed.The shell-side of two kinds of fresh air system heat exchangers with different structural parameters was simulated and analyzed under summer working conditions by FLUENT software,and the reliability of the calculation model was verified by comparing it with the experimental data.The results showed that under the same volume flow rate,with the increase of the shell-side opening area,the convective heat transfer coefficient h decreased,the pressure dropΔp decreased,while the change of comprehensive performance coefficient h/Δp^(1/3) was not obvious.With the decrease of pitch,the convective heat transfer coefficient h increased,and the pressure dropΔp increased,but h/Δp^(1/3) also increased. Flow field analysis showed that the spiral flow along the wall surface of the twisted oval tube was obvious in the shell-side flow channel of the twisted oval tube heat exchanger, the air in the flow channel was fully disturbed, and the heat transfer effect was enhanced.

关 键 词：扭曲椭圆管 壳程 强化传热 数值模拟 

分 类 号：TK124[动力工程及工程热物理—工程热物理]