板翅式换热器入口结构的改进  

Improvement of entrance configuration in plate-fin heat exchanger

作　　者：文键[1] 厉彦忠[1] 周爱民[1] 张科[1] 

机构地区：[1]西安交通大学能源与动力工程学院,西安710049

出　　处：《吉林大学学报（工学版）》2006年第2期177-182,共6页Journal of Jilin University:Engineering and Technology Edition

基　　金：全国首届优秀博士学位论文作者专项基金资助项目(199933);教育部跨世纪优秀人才基金资助项目;西安交通大学博士学位论文基金资助项目(DFXJTU2004-02)

摘　　要：利用Particle Image Velocimetry(PIV)粒子图像测速仪对板翅式换热器入口结构改进前后的流场进行了实验测试,获得了入口结构内部不同剖面处的流场速度矢量和流线分布图。发现对在入口结构1/2高度处添加打孔挡板的改进型结构,其物流分配的均匀性有了很大改善,速度场分布更加合理,从而验证了PIV技术非常适合于研究复杂的流动结构。进一步的换热实验表明,入口结构改进之后的换热器,温度分布更加均匀,换热效率也提高了约15%。Flow characteristics of flow field in the header of plate-fin heat exchanger were investigated by means of particle image velocimetry （PIV） and a series of velocity vector and streamline graphs of different cross-sections before and after the header improvement were achieved. The experimental results indicated that the improved header configuration with a punched baffle can effectively enhance the uniformity of fluid flow distribution. The results validate that PIV is well suitable to investigate complex flow pattern. And further heat exchange experiments indicate that for the improved header configuration, the temperatures are distributed more uniformly in the heat exchanger core and the heat exchanger efficiency can be effectively enhanced about 15%.

关 键 词：热工学 板翅式换热器 PIV 换热 结构优化 

分 类 号：TK124[动力工程及工程热物理—工程热物理]