Abstract: In order to improve heat transfer efficiency in fin regions and the overall heat transfer performance of plate-fin heat exchangers， a new micro convex fin structure was proposed. An approximate model was constructed based on the simulation results of thermodynamic performance at multiple sampling points of the structure parameters. With the total heat transfer rate as optimization objective and the pressure drop as the constraint， the optimum structure parameters （micro convex height， micro convex angle， micro convex opening length） of micro convex were determined by using sequential quadratic programming algorithm. And the arrangement spaces and arrangement type of micro convex were optimized to determine the specific parameters of improved micro convex fin structures. Through the temperature and pressure field analysis of fin channels， and the comparison of heat transfer performance with the same size of straight fin， the effectiveness of the new micro convex fin structure was verified.

Key words: plate-fin heat exchanger, micro convex fin, heat transfer performance, structural design

摘要： 为提高翅片区域的换热效率、改善板翅式换热器的整体换热性能，提出了一种新型微凸翅片结构。基于结构参数多采样点处的热力学性能仿真结果构建近似模型，以翅片热功率最高为优化目标、压降为约束，使用序列二次规划法确定了微凸体结构参数（微凸高度、微凸夹角、微凸开口长度）的最优值；对微凸体排列间距、排列方式进行优化，确定了改进微凸翅片结构的具体参数值。通过对翅片流道内温度场、压力场分析，以及与相同尺寸的平直翅片的换热性能对比，验证了所提出的新型微凸翅片结构的有效性。

关键词: 板翅式换热器, 微凸翅片, 换热性能, 结构设计