中文摘要：

本文对具有凹陷涡发生器的冷却通道内非稳态湍流流动与传热特性进行了分离涡模拟研究。通道内流动雷诺数为50500，凹陷涡发生器深度与直径比为0．2。分离涡模拟结果与实验数据进行了对比验证，并对凹陷表面非稳态流动与传热特性进行了详细分析。研究结果表明：分离涡模拟得到的凹陷表面时均局部^忆数分布与瞬态液晶热像实验得到的^k数分布相似，并且总体平均Nu数和摩擦因子与实验数据也较好地吻合；分离涡模拟获得了详细的凹陷涡发生器表面非稳态流动和传热特征，凹陷表面前缘处的低换热区形成左右两个旋涡，经历了形成、旋转、回流、破碎四个过程，这些非稳态的涡流动显著地强化了凹陷表面的对流传热性能。

英文摘要：

A detached eddy simulation （DES） of unsteady flow and heat transfer characteristics of the cooling channel with dimple vortex generators are studied in the paper. The Reynolds number of the flow is 50500 in the channel, and the dimple depth to diameter ratio is 0.2. The results of the DES simulation are compared with the experimental data, and the unsteady flow and heat transfer characteristics of the dimple surface are analyzed in detail. The results show that the local Nu distribution is similar to the Nu distribution obtained by the transient liquid crystal thermography experiment, and the average Nu and friction factor are in good agreement with the experimental data. The unsteady flow and heat transfer characteristics of the dimple surface are obtained by DES. The results show that two vortices are formed on the left and right in the low heat transfer region in the front half of the dimples, and the unsteady vortices are undergoing the following four processes： generation, rotation, recirculation and breakdown. These unsteady vortex flow significantly enhances the convective heat transfer performance of the dimples.