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为了对不同排列方式的H型翅片管进行数值分析,建立不同布置方式下H型翅片管束流动及换热数值模型,获得两种典型布置下的流动及传热特性变化规律。结果表明,H型翅片特殊沟槽结构使背风侧形成纵向冲刷流场,存在明显的三维流动特征,使得其具有自清理、不易积灰的功能;错排翅片基管传热系数大于等间距排列的基管,并且随速度增大,换热效果差异越明显;管束行距对翅片管传热系数的影响明显大于列距的影响,管束行距增大,引起流道内空气平均速度下降,传热系数降低,流道损失减小。
In order to analyze the numerical results of H-finned tubes with different arrangement, numerical models of flow and heat transfer of H-finned tubes under different layouts were established. The variation of flow and heat transfer characteristics under two typical layouts were obtained. The results show that the special groove structure of H-shaped fins makes the leeward side to form longitudinal scouring flow field and has obvious three-dimensional flow characteristics, which makes it self-cleaning and difficult to fouling. The heat transfer coefficient of staggered fin base pipes is greater than The effect of heat transfer was more obvious with the increase of velocity. The influence of tube bundle spacing on the heat transfer coefficient of finned tube was obviously greater than that of column pitch. The increase of tube bundle spacing caused the average velocity of air in the flow channel to decrease, The heat transfer coefficient is reduced and the runner loss is reduced.