螺旋微肋管腔体吸热器强化换热特性研究  

Study on enhanced heat transfer characteristics of spiral micro⁃fin cavity heat absorber

作　　者：张寅生 胡俊虎[1,2] 刘浩 胡凯强 ZHANG Yin-sheng;HUJun-hu;LIUHao;HU Kai-qiang(College of Energy and Power Engineering,Inner Mongolia University of Technology,Hohhot 010051,China;Key Laboratory of Renewableenergy,Hohhot 010051,China)

机构地区：[1]内蒙古工业大学能源与动力工程学院,内蒙古呼和浩特010051 [2]内蒙古可再生能源重点实验室,内蒙古呼和浩特010051

出　　处：《能源工程》2023年第2期6-11,共6页Energy Engineering

基　　金：内蒙古自然科学基金资助项目(2017MS(LH)0505)。

摘　　要：吸热器作为碟式太阳能聚光集热系统的核心部件,其光热转换效率的提高具有重大意义。采用实验与fluent模拟相结合的方法,探究220 mm×160 mm圆柱腔体吸热器和螺旋微肋盘管组装模型的换热特性,研究表明,1 mm直径25 mm螺距的微肋丝结构涡流和二次流形成效果较为明显,综合换热效果较好。换热实验中,微肋丝能够加强流体的扰动,有效削减流体的径向温差;70 L/h入口流量的换热温升效果较为明显。光热转换实验中,吸热器热损与入口流量呈负相关,20 L/h之后达到最低;吸热器的光热转换效率与腔体工质温差的变化呈负相关,最高可以达到68%。As the core component of the disc solar energy collecting system,the heat absorber is of great significance to improve the photothermal conversion efficiency.In this paper,the heat transfer characteristics of 220 mm×160 mm cylindrical cavity heat absorbent and spiral microribbed coil assembly model were investigated by combining experiment and FLUENT simulation.The research shows that the formation effect of eddy current and secondary flow of 1mm diam⁃eter and 25mm pitch microribbed wire structure is the most obvious,and the comprehensive heat transfer effect is the best.In the heat transfer experiment,the micro⁃ribbed wire can strengthen the fluid disturbance and effectively reduce the radial temperature difference of the fluid.The heat transfer temperature rise effect of 70 L/h inlet flow is the most obvious.In the photothermal conversion experiment,the heat loss of the absorber was negatively correlated with the inlet flow rate,and reached the minimum after 20 L/h.The photothermal conversion efficiency of the heat absorber is negatively correlated with the temperature difference of the cavity mass,up to 68%.

关 键 词：吸热器 螺旋微肋盘管 流体特性 换热实验 光热转化 

分 类 号：TK519[动力工程及工程热物理—热能工程]