封头结构对板翅式换热器流体分配性能的影响  

Effect of header configuration on flow distribution performance in plate-fin heat exchangers

作　　者：田津津[1] 张哲[1] 厉彦忠[2] 李曼[1] 

机构地区：[1]天津商业大学天津市制冷技术重点实验室,天津300134 [2]西安交通大学能动学院,西安710049

出　　处：《低温工程》2013年第4期19-22,共4页Cryogenics

基　　金：教育部科学技术研究重点项目资助(212007);天津市高等学校科技发展基金计划项目(20100420)

摘　　要：研究了板翅式换热器封头高度与流体分配之间的关系,实验结果说明板翅式换热器的流体分配与封头高度有很大关系,封头高度越高流体分配就越均匀。引入不均匀参数,以便可以对流体在出口截面的分配特性进行研究,并进一步研究封头结构型式不同对于流体分配的影响,研究表明:换热器内部流体的流速的最大值与最小值的比值由3—4减少到1.1—1.2,其不均匀度也从原来的0.331减少到0.046。Through an experimental system of flow distribution, a study on the flow distribution in plate- fin heat exchanger was begun. Experiment results show that the header configuration influences the flow maldistribution in plate-fin heat exchanger seriously. At the same time, experiment of influence for height of header on fluid flow maldistribution in plate-fin heat exchangers was carried out. The experiment results in- dicate that the higher header configuration is, the better the fluid flow distribution in plate-fin heat exchang- ers is. To describe the characteristics of header configuration, flow nonuniformity parameters were defined. The influences of different header configurations on flow allocation in plate-fin heat exchangers were experi- mentally studied. The experiment results indicate that the ratio of the maximum flow velocity to the mini- mum flow velocity of heat exchanger drops from 3 - 4 to 1.1 - 1.2 and the degree of flow nonuniformity re- duces from 0.331 to 0. 046.

关 键 词：板翅式换热器 流体分配 封头结构 

分 类 号：TB611[一般工业技术—制冷工程] TK124[动力工程及工程热物理—工程热物理]