摘要
根据大型电站锅炉省煤器的运行工况,对单H形和双H形翅片管束气侧的传热与阻力特性进行了模化试验研究,并利用Fluent软件对H形翅片管束的流场和温度场进行了数值模拟,得到单H形和双H形翅片管束的传热与阻力特性变化规律.结果表明:H形翅片管束的传热和阻力特性与气体的Re有关,随着气体Re的增大,气侧Nu不断增大,传热性能提高,而Eu则逐渐减小,并趋于定值;在相同Re下,单H形翅片管束气侧Nu大于双H形翅片管束气侧Nu,而气侧Eu则小于双H形翅片管束气侧Eu;数值计算结果与试验结果误差较小,采用数值计算方法能比较准确地分析H形翅片管束的流动与传热特性.
Based on general conditions of boiler economizer in large power plant, experimental tests were performed to the heat transfer and resistance characteristics at air-side of single or double H-type finned tube banks, while corresponding numerical simulation performed to the flow and temperature field using Fluent software, during which variation laws of the heat transfer and resistance characteristics obtained. Results show that the heat transfer and resistance characteristics of H-type finned tube banks are influenced by the Reynolds number of gas, i.e. with the growth of Re, the air side Nu will rise gradually, meaning the heat transfer performance will get better and better, whereas the air-side Eu will drop step by step, and will finally get to a fixed value. In the case of a same Re, the air side Nu of single H type finned tube banks will be larger than that of double ones, and for air-side Eu, the variation law is just the opposite. Results of numerical simulation agree well with that of the experimental test, indicating that the numerical calculation method may be used for analysis of flow and heat transfer characteristics of H type finned tube banks.
出处
《动力工程学报》
CAS
CSCD
北大核心
2010年第6期433-438,共6页
Journal of Chinese Society of Power Engineering
基金
上海市科学技术委员会创新行动计划资助项目(07dz12005)
关键词
H形翅片管束
传热特性
阻力特性
试验
数值模拟
H-type finned tube bank
heat transfer performance
resistance characteristic
experimental test
numerical simulation
