H型鳍片管性能优化数值研究_张知翔.pdfVIP

30 12 动 力 工 程 学 报 Vol. 30 No. 12 2010 12 Journal of Chinese Society of Pow er Engineering Dec. 2010 : 1674-7607(2010) 12-094 1-06 :TK 124 :A : 10. 80 H 张知翔, 王云刚, 赵钦新 ( , 710049) : 基于Fluent 平台, 利用Realizable k-湍流模型对H 型鳍片管的传 特性阻力特性和综 合性能进行了数值研究. 结果表明: 当烟气流速越高翅片高度越小翅片节距越小管束横向节距 越大管束纵向节距越大时, H 型鳍片管的传 系数越大; 当烟气流速越高翅片高度越大翅片节 距越小管束横向节距越小管束纵向节距越大时, H 型鳍片管的流动阻力越大; 当相对翅片高度 为h/ d= 2. 10 翅片节距越小管束横向相对节距为s1/ d= 2. 237管束纵向节距越小时, H 型鳍片 管的综合性能最好. : H 型鳍片管; 传 特性; 阻力特性; 综合性能; 数值研究 Numerical St udy on Performance Opt imization of H- type Finned Tubes ZH A N G Zhi-x iang , WA N G Yun-g ang , ZH A O Qin-x in ( School of Energy and Pow er Engineering, Xian Jiaotong U niversity , Xian 710049, China) Abstract: Numerical study on heat transfer and flow resistance characteristics as w ell as comprehensive performance of H-type finned tubes w as performed by using Realizable k-turbulent model based on Fluent platform . Results show that the heat transfer coefficient of H-type finned tube increases w ith rising gas ve- locity, transversal pitch and longitudinal pitch of tube banks, and w ith reducing fin height and fin pitch. The flow resistance of H-type finned tube increases w ith the rise of gas velocity, fin height and longitud-i nal pitch, and w ith the decrease of fin pitch and transversal pitch. Best comprehensive performance of H- type finned tube w ill be obtained w hen the relative fin height h/ d and transversal pitch s 1/ d are 2. 10 and 2. 237 respectively, w hile the fin pitch and longitudinal pitch are the smallest. Key words: H-type finned tube; heat transfer characteristic; resistance characteristic; comprehensive per- formance; numerical study , 70 000 MW 2 . H [ 1] H . , : .