中文摘要：

根据质量、动量、能量守恒定律,采用SIMPLEC算法,对空气在内置肋板正方形通道的传热与流阻特性进行数值模拟,分析了不同攻角和开缝位置对通道传热综合性能的影响;通过对局部流场、温度场、热流密度、绝对涡量、阻力因子的分析揭示了空气在内置肋板正方形通道的传热强化与流动减阻机制。结果表明：攻角为30°时通道的传热综合性能最佳,在此基础上进行肋板的底部开缝可以进一步降低阻力和强化传热速率,提高传热综合性能;通道内加装肋板可以导流通道二次流,均化通道流场,加强近壁区流体与主流区流体的置换程度,从而提高通道的传热速率;绝对涡量可以表征单一二次流的强化,但不能完全表征开缝通道的传热强化现象;肋板攻角及开缝的流动减阻主要降低了通道的形体阻力。

英文摘要：

On the basis of the conservation laws of mass,momentum and energy,the heat transfer and flow resistance characteristics of air in square channels with rib baffle were numerically simulated.The effects of attack angle and slit location on the comprehensive heat transfer performance in the channel were investigated.Moreover,the local fluid flow streamlines,temperature contour,heat flux distribution,absolute vorticity flux and drag factor were also analyzed to reveal the mechanisms of heat transfer enhancement and flow resistance reduction for different square channels.The results show that the attack angle plays an important role in the heat transfer and flow behaviors of the air.The comprehensive heat transfer performance of air in the channel reaches the optimum with attack angle of 30°.On this basis,the slit location on the bottom of rib baffle is in favor of reducing the flow resistance and enhancing the heat transfer rate.The obtained results also present that the rib baffle can induce secondary flow in the flow channel,homogenize the flow and improve the flow mixing between the near wall zone and mainstream zone,which enhances the heat transfer.The absolute vorticity flux can characterize the intensity of single secondary flow in a typical rib baffle square channel while it can not sufficiently describe all heat transfer enhancement mechanism in square channels with slotted baffle.The flow resistance reduction by varying the attack angle and slit location mainly acts on the channel＇s form drag.