摘要
为研究低压省煤器H型鳍片管的传热特性及阻力特性,采用realizable湍流模型数值研究H型鳍片管管束外烟气的流动传热特性。研究结果表明:H型鳍片管具有均匀气流的作用,在管壁面形成的漩涡能够加强通道内绕流作用,利于强化传热;当烟气的流速越高,H型鳍片管传热系数越大,流动阻力逐渐增大;当鳍片节距增加,H型鳍片管传热系数增加,流动阻力逐渐降低;在节距为18 mm时,鳍片管传热系数较高,流动阻力最小,选用18 mm的鳍片节距最为经济。
In order to investigate heat transfer and resistance characteristics of H- type finned tube in the low pressure economizer,realizable turbulence model was adopted to analyze flow and heat transfer characteristics of flue gas covered by H- type finned tube. The results show that the H- type finned tube can make the airflow become uniform;the vortexes formed on the wall are favorable to enhance heat transfer because of detouring flow in the channel;the higher velocity of flue gas is,the larger heat transfer coefficient of H- type finned tube and flow resistance will be;with the increase of pitch of the finned tube,the heat transfer coefficient increases,flow resistance decreases;when the pitch of H-type finned tube is 18 mm,the value of heat transfer coefficient reaches a peak and flow resistance is smallest. Therefore,the selection of 18 mm- pitches H- type finned is most economical.
出处
《河北工程大学学报（自然科学版）》
CAS
2016年第2期99-102,共4页
Journal of Hebei University of Engineering:Natural Science Edition
基金
河南省高校科技创新团队支持计划资助项目(16IRTSTHN017)
关键词
H型鳍片管
流场分布
传热系数
流动阻力
数值研究
H-type finned tube
distribution of flow field
heat transfer coefficient
flow resistance
numerical simulation
