泡沫填充方式对管内超临界CO2流动换热的影响研究  

Research on effects of foam filling types on heat transfer of supercritical CO2 flow in tube

作　　者：刘占斌 何雅玲[1] 王坤[1] 马朝[1] 姜涛[1] LIU Zhanbin;HE Yaling;WANG Kun;MA Zhao;JIANG Tao(Key Laboratory of Thermo-Fluid Science and Engineering of Ministry of Education,School of Energy and Power Engineering,Xi’an Jiaotong University,Xi’an 710049,Shaanxi,China)

机构地区：[1]西安交通大学热流科学与工程教育部重点实验室

出　　处：《化工学报》2019年第9期3329-3336,共8页CIESC Journal

基　　金：国家自然科学基金项目(51876149)

摘　　要：超临界CO2工质在太阳能热发电系统中的应用能够有效提升整个系统的效率、紧凑性和环境友好性,因此有必要优化超临界CO2用太阳能集热器的综合性能。提出了泡沫材料有效热导率新的预测模型,并研究了不同泡沫材料填充方式对集热管内超临界CO2流动与换热性能、管壁温度分布的影响规律。结果表明,环形填充方式(沿管内壁填充)的流动换热综合性能指标(j/jc)/(f/fc)1/3最优,净吸热量最大,管壁最高温度最低且温度分布最均匀。The application of supercritical CO2 in solar thermal power generation system could effectively improve the efficiency,compactness and environmental friendly of the system.Therefore,it is necessary to optimize the comprehensive performance of solar collectors using supercritical CO2.In this paper,a new calculation model for the effective thermal conductivity of foam materials is proposed.The effects of different foam filling types on the flow and heat transfer performance and wall temperature distribution in receiver tubes are studied.The results show that the flow-heat transfer performance index(j/jc)/(f/fc)1/3 is optimal for the annular filling method(filled along the inner wall of the tube),the net heat absorption is the largest,the highest wall temperature is the lowest and the temperature distribution is the same.

关 键 词：超临界CO2 太阳能管式集热器 泡沫材料有效热导率 强化传热 

分 类 号：TK124[动力工程及工程热物理—工程热物理]