梭形百叶窗结构内传热强化数值分析

Research on Convective Heat Transfer Characteristics of New Kinds of Automotive Louver Fins

提出一种新型百叶窗结构—梭形百叶窗,它与一般的矩形百叶窗结构相比,流道从翅片中间截面到管连接处逐渐变宽,有较多流体冲刷管壁表面,增加管壁附近流体温度梯度,从而使传热增强。同时降低了流体流动阻力。具有较好的流动和传热性能。应用FLUENT软件对两种百叶窗结构下空气的流场、温度场和压力场进行了CFD研究,分析不同Re数对换热和流动性能的影响。

A shuttle-shape louver structure is proposed. The channel of shuttle-shape louver structure from middle of fin to the tube surface becomes wider and wider compared with rectangular-shape louver structure. The tube surface is scoured with more fluid and higher temperature gradient is produced near tube surface in the shuttle-shape louver structure. Heat transfer is intensified and flow resistance is reduced because of the new type louver structure which has better flow and heat transfer properties. The CFD （Computational Fluid Dynamics） software Fluent is used to simulate the arrangement of flow, temperature and pressure of the two louver structures. The influence of Reynolds number to heat transfer and flow is analyzed.