使用瞬态液晶(TLC)热像传热测试技术,对具有边缘倒圆的凹陷涡发生器局部传热特征和流动阻力进行了实验研究。凹陷边缘倒圆方案有2种:凹陷前边缘倒圆和凹陷边缘全部倒圆。凹陷的投影直径与通道高度比为1.0,凹陷深度与直径比为0.2,实验雷诺数范围为10 000~60 000。实验结果表明,在选取的雷诺数下,相比于光滑通道,边缘无倒圆的常规球型凹陷涡发生器阵列表面对流换热性能提升了约62.0%,相应的摩擦因子也增大了约73.0%。与无倒圆的常规球型凹陷涡发生器相比,边缘全倒圆的凹陷涡发生器换热性能提升了约3.6%,摩擦因子降低了约4.6%;前边缘倒圆的凹陷涡发生器换热性能提升了约11.0%,摩擦因子提高了约5.2%。综合看来,边缘倒圆使得凹陷涡发生器内部表面传热更加均匀;前边缘倒圆的凹陷涡发生器综合换热性能最高,比边缘无倒圆的常规凹陷涡发生器高出约9.6%;而边缘全部倒圆的凹陷涡发生器的综合换热性能比常规凹陷涡发生器高出近4.4%。 Using transient liquid crystal (TLC) thermography heat transfer test technique, the local heat transfer characteristics and flow resistance of a concave vortex generator with edge rounding were experimentally studied. There are two kinds of concave edge rounding scheme: the concave front edge rounding and the concave edge rounding all. The ratio of the projection diameter to the channel height of the depression is 1.0, the depth of the depression to the diameter is 0.2, and the experimental Reynolds number ranges from 10 000 to 60 000. The experimental results show that the convective heat transfer performance of the conventional spherical concave vortex generator arrays with no round edges increases by about 62.0% and the corresponding friction factor increases by about 73.0%. Compared with the conventional spherical concave vortex generators without rounding, the edge full round concave vortex generator heat transfer performance increased by about 3.6%, the friction factor decreased by about 4.6%; front edge rounded concave vortex generator Heat transfer performance increased by about 11.0%, friction factor increased by about 5.2%. In summary, the edge rounding makes the internal surface of the concave vortex generator heat transfer more uniform; the front edge rounded concave vortex generator has the highest overall heat exchange performance, about 9.6% higher than the conventional concave vortex generator with no round edge, While the overall heat transfer performance of the concave edge vortex generator with all the edges is nearly 4.4% higher than that of the conventional concave vortex generator.