中文摘要：

采用数值模拟的方法，研究了矩形通道布置矩形翼纵向涡发生器后二次流强度和涡量强度在流动方向上的变化规律，分析了涡量强度对强化换热和阻力增加的贡献．结果表明：涡量强度JABS在整个通道内的变化规律与局部Nu相同，即通道入口的局部Nu较大．受纵向涡发生器的影响，局部Nu出现一极值后逐渐减小；与二次流强度JABSx相比，涡量强度JABS更能反映流动与换热之间的关系；得到了Mu和f的增加量与无量纲涡量强度之间的关系．

英文摘要：

The secondary flow intensity and vorticity intensity distributions along the flow direction in a rectangular chan- nel arranged with rectangular longitudinal vortex generators were numerically studied. The contribution of vorticity in- tensity on heat transfer enhancement and pressured drop is analyzed. The result shows that the distribution ofvorticity intensity in the whole channel is similar to that of local Nusselt number, i.e. the local Nusselt number in the inlet section of the channel is relatively higher, and then it decreases gradually after a peak. Compared with secondary flow intensity, vorticity intensity is more suitable for revealing the mechanism of the heat transfer enhancement and fluid flow. The relationship of increments of Nusselt number and drag factor and the dimensionless vorticity intensity was obtained.