板翅式换热器入口流场的模拟及实验研究  

A numerical and experimental investigation of the flow field at the entrance of plate-fin heat exchanger

作　　者：文键[1] 厉彦忠[1] 周爱民[1] 马岩松[1] 

机构地区：[1]西安交通大学制冷低温研究所,陕西西安710049

出　　处：《化学工程》2006年第8期24-27,共4页Chemical Engineering(China)

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);西安交通大学博士学位论文基金资助项目(DFXJTU2004-02)

摘　　要：利用PIV粒子图像测速仪和CFD数值模拟的方法,对板翅式换热器入口结构改进前后的流场进行了研究,发现其内部流场的流动与分布规律。由于原始入口结构的不合理导致漩涡、回流等现象存在,使得其内部的物流分配极不均匀。而对于添加了打孔挡板的改进型结构,物流分配的均匀性有了很大改善。实验结果和数值计算结果吻合良好,不仅验证了计算模型的正确性,而且证明PIV技术适合于研究复杂的流动结构。The turbulent flow structure inside the entrance of plate-fin heat exchanger was characterized by using PIV experiments and CFD simulations. The experiments and computations were performed under similar conditions. Results were obtained for two distinct configurations, involving conventional and improved configuration. A series of velocity vector and streamline graphs of different cross-sections were achieved. The numerical and experimental results indicate that performance of fluid maldistribution in conventional entrance is very serious while the improved configuration with punched baffle can effectively improve the performance. Numerical results and the experimental data are in good agreement with each other. It validates that PIV and CFD are well suitable to investigate complex flow patterns.

关 键 词：板翅式换热器 PIV 数值模拟 结构优化 

分 类 号：TK172[动力工程及工程热物理—热能工程]