中文摘要：

凹陷涡发生器是一种高效的燃气轮机涡轮叶片冷却结构,本文对分别具有球形和泪滴形凹陷涡发生器阵列的表面传热与流动性能开展了实验和数值计算研究。本文分别采用Standardκ-ω,SST和Reliazableκ-ε三种湍流模型计算了凹陷涡发生器表面湍流传热与流阻性能,并与实验结果进行了对比,确定了Standardκ-ω是研究凹陷传热和流动最精确的湍流模型。通过该研究,获得了球形和泪滴形凹陷涡发生器在雷诺数范围8500~60000内的传热及流阻和流动特性。该实验研究表明,与光滑通道内湍流流动相比,球形凹陷传热性能提高约60%,摩擦因子增加约70%;泪滴凹陷传热性能提高约90%,摩擦因子增加一倍左右。泪滴形凹陷表现出更好的传热性能和综合热性能。

英文摘要：

Dimples are very efficient heat transfer enhancement structures.Based on experimental and numerical studies,the heat transfer and friction factor of sphereand teardrop dimples were investigated.Through the comparisons of the heat transfer and friction factor results obtained by the experiments and numerical results,it was found that the standard κ — ω model can best predict the flow and heat transfer in the dimpled channels.The heat transfer and flow structure characteristics in the two dimpled channelshave been obtained and compared with each other for the Reynolds numbers of 8500-60,000.The study shows：compared to the flat channel experimental data,the sphere dimple enhances the heat transfer by about60%and the friction factor by70%;and the teardrop dimple enhances the heat transfer by about90%and the friction factor by100%.Generally speaking,the teardrop dimple presents the best heat transfer and overall performance.