纵向涡发生器对百叶窗翅片管换热器性能的提升

Performance Enhancement of Louvered Fin Heat Exchanger by Using Longitudinal Vortex Generator

百叶窗和纵向涡发生器都能够较大幅度提升翅片管换热器的换热能力，同时其流动阻力也相应增大。本文利用CFD 技术对4 种不同类型的翅片管换热器（平翅片、百叶窗翅片、百叶窗加装三角翼翅片和百叶窗加装矩形翼翅片）的流动传热性能进行了三维数值模拟，得到了在不同雷诺数下各翅片管换热器的换热因子j 和摩擦因子f 以及换热器综合性能j/f。结果表明，百叶窗翅片加装纵向涡发生器后，换热管尾部滞止区尺寸明显减小，滞止区与主流区的换热得到增强，换热器综合性能得到了提升，加装三角翼其换热器综合性能提升了1.25%~2.63%，加装矩形翼其换热器综合性能提升了3.33%~4.82%。

The louvered fin structure and longitudinal vortex generator can significantly enhance the heat transfer infin-and-tube heat exchanger with a corresponding increase of the flow resistance of the heat exchanger. A 3-Dnumerical simulation using computational fluid dynamics (CFD) was employed to investigate the flow and heat transfercharacteristics of four different forms (flat fin, louvered fin, louvered fin with delta winglets, louvered fin withrectangular winglets) fin-and-tube heat exchangers, and the colburn factor j, friction factor f and overall performance j/fat different Reynolds number were obtained. The results show that, the size of the wake zones is reduced and the heattransfer with main flow is enhanced because the vortex generator, and the overall performance of louvered fin withdelta winglets and rectangular winglets was increased by 1.25%~2.63% and 3.33%~4.82%, respectively.