中文摘要：

在Re=4800~10200范围内,实验研究了矩形通道内圆管侧后方两排三角小翼V形阵列布置的强化换热特性,比较了三角小翼V形阵列布置和单排大三角小翼布置的换热差异,研究了攻角、翼高和排列间距对换热的影响。结果表明：三角小翼V形阵列的Nu数比单排大三角小翼平均增加4.9%,且随着阵列中翼片前后排间距的增加,换热呈增强趋势。对于三角小翼V形阵列和单排大三角小翼,随着小翼攻角的增加,通道换热先增加后减小,最佳攻角均为α=60°,随着小翼翼高的增加,通道换热单调增加。实验数据拟合得到了V形三角小翼阵列和单排大三角小翼的Nu数无量纲关联式,为管翅式换热器中三角小翼的布置提供了依据和参考。

英文摘要：

In the range of Re = 4800 - 10200, the experiment was made to investigate the heat transfer characteristics of two rows of the delta winglets arrayed in V shape at the back side of the round tube in the rectangular channel. The heat transfer enhancement was com- pared between the delta winglets with V-shaped array and the single-row large delta winglets, and the effects of attack angle of delta wing- let, winglet height and spacing of winglet array were examined. Results show that Nu of the delta winglets with V-shaped array is 4.9% higher than that of the single-row large delta winglets, and the heat transfer in the channel has an increasing trend with the increase of the spacing in winglet array. For the delta winglets with V-shaped array and the single-row large delta winglets, with increasing the attack an- gle of the delta winglet, the heat transfer enhancement increases firstly and then decreases, and the optimal attack angle is a = 60°, while, the heat transfer enhancement in both layouts monotonically increases with the increase of the winglet height. The correlations of Nu for the delta winglets with V-shaped array and the single-row large delta winglets are respectively derived by the regression analysis of ex- perlmental data. These correlations can be referred for the arrangement of the delta winglets in the fin-and-tube heat exchanger.