板翅式换热器封头结构物流分配的PIV实验研究  

Flow distributions of header configurations in plate-fin heat exchangers with particle image velocimetry(PIV)

作　　者：周爱民[1] 厉彦忠[1] 文键[1] 张科[1] 王江[1] 

机构地区：[1]西安交通大学能源与动力工程学院,陕西西安710049

出　　处：《化工学报》2006年第3期486-490,共5页CIESC Journal

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

摘　　要：在数值模拟的基础上,利用粒子图像测速仪(PIV)对板翅式换热器原始封头A和3种改进的顺排孔板型封头结构(B、C、D)的流场进行了可视化的实验,获得了封头内部不同截面处流场的速度流线分布图.比较了Re=6.22×104时原始封头A和一种改进型封头B的出口物流分配以及3种不同中孔面积比率的改进型封头对出口物流分配的影响.结果表明:改进型封头结构能有效地改善物流分配的均匀性;C型封头的不均匀参数SU和最大流速与最小流速之比θU最低;流量分布和中孔面积比率之间存在着一个最佳值.Based on numerical simulation, the flow distributions of the ordinary header and three improved headers was studied with PIV, and a series of velocity streamline graphs of different cross sections were obtained. At Re=6.22×10^4 the outlet flow distributions of the ordinary header and an improved header, and the effects of flow distribution of three improved headers with different middle-hole-area ratios were compared. The experimental results showed that the perforated plate header configuration could effectively improve the uniformity of fluid flow distribution. Flow maldistribution parameter Su and the ratio of the maximum velocity to the minimum velocity θu of the type C header configuration were minimum. There was an optimum point between flow distribution and the middle hole-area ratio.

关 键 词：孔板型结构封头 物流分配 中孔面积比率 PIV 结构优化 

分 类 号：TK124[动力工程及工程热物理—工程热物理]