非对称波节管在汽汽换热中的传热及熵产分析  

Analysis on heat transfer and entropy generation of asymmetric corrugated tube in steamreheater

作　　者：林宝森 谭锐 李志炜 张洪涛 何秋婷 王炯铭 殷戈 姜燕妮 LIN Baosen;TAN Rui;LI Zhiwei;ZZHANG Hongtao;HE Qiuting;WANG Jiongming;YIN Ge;JIANGYanni(Guoneng Quanzhou Thermal Power Co.,Ltd.,Quanzhou 362804,China;Guoneng Nanjing Electric Power Test Research Co.,Ltd.,Nanjing 210023,China;College of Mechanical and Electrical Engineering,Hohai University,Nanjing 210024,China)

机构地区：[1]国能(泉州)热电有限公司,福建泉州362804 [2]国能南京电力试验研究有限公司,江苏南京210023 [3]河海大学机电工程学院,江苏南京210024

出　　处：《热科学与技术》2023年第1期88-94,共7页Journal of Thermal Science and Technology

基　　金：国家能源集团公司科技资助项目(GJNY-19-171);中央高校基本科研业务经费资助项目(B200201036,B200201037);常州市应用基础研究计划资助项目(CJ20200069)。

摘　　要：为了揭示非对称波节管在汽汽换热中的强化作用,通过数值模拟的方法研究了对称型和非对称波节管的流动换热特性及熵产分布规律。结果表明:采用非对称型结构易于使流体与壁面贴合,并增大壁面处的温度梯度,强化波节结构与流体之间的换热;高温蒸汽侧波节结构的两端和低温蒸汽侧波节结构最大凸起位置的局部熵产值最大,且对流换热效应较强。随进口流速增大,对称型和非对称型结构的壁面平均努塞尔数变化趋势基本一致,采用对称型波节结构的压降要大于非对称型波节结构,因而采用非对称型波节结构的经济性要好于对称型波节结构。In order to reveal the enhancement effect of asymmetric corrugated tube on steam-steam heat transfer,the flow and heat transfer characteristics and entropy generation distribution of symmetric and asymmetric corrugated tubes were studied by numerical simulation.The results show that the temperature gradient near the tube wall at the inlet is large with the asymmetric structure.The local entropy values are the largest at two positions as the two ends of the high-temperature steam side node structure and the maximum convex positions of the low-temperature steam side node structure,where the convective heat transfer effect is strong.With the increase of inlet velocity,the change trend of average Nusselt number of symmetrical and asymmetric structures is basically the same,and the pressure drop of symmetrical wave node structure is greater than that of asymmetric wave node structure,so the economic efficiency of asymmetric wave node structure is better than that of asymmetric wave node structure.

关 键 词：工业供热 汽汽换热 强化换热 非对称型波节管 数值模拟 

分 类 号：TK124[动力工程及工程热物理—工程热物理]