中文摘要：

通过采用瞬态液晶热像测试技术，对具有V肋-凹陷涡发生器复合结构的表面湍流流动和传热特征进行了实验研究，分析了雷诺数（Rg）在10000～60000内具有不同肋高的V肋-凹陷阵列表面高精度传热分布，以及流阻损失特征．实验结果表明：充分发展湍流条件下的V肋-凹陷结构表面传热性能是光滑通道传热性能的1．98～2．46倍，摩擦因子是后者的2．24～4．36倍；V肋-凹陷表面传热性能是球形凹陷表面传热性能的1．21～1．76倍，摩擦因子是球形凹陷的1．96～3．89倍．在R8〈20000的条件下，具有0．6和1．0mm高的V肋复合结构表面的综合热性能比具有1．5mm高的V肋-凹陷表面高约4．7％～12．8％；随着Re继续提高，0．6和1．0mmV肋-凹陷的综合换热能力逐渐降低，而1．5mmV肋-凹陷的综合换热能力逐渐上升，且比0．6和1．00mmV肋-凹陷高约4．7％～8．3％．

英文摘要：

A structured surface with small-sized V ribs and dimples is a potentially high-performance cool- ing structure used for gas turbine blades. A comparative transient liquid crystal （TLC） transient experi- mental study was conducted to obtain the high-resolution heat transfer characteristics and pressure loss in the cooling channels with different heights of V-shaped rib-dimple in the Reynolds number range of 10 000 to 60 000. The results indicated that, under the condition of fully developed turbulent flow, the Nusselt number of the V-shaped rib-dimple is 1.98 to 2.46 times of that of the smooth flat, with a friction factor of 2.24 to 4.36 times of that of the smooth flat. The Nnsselt number of the V-shaped rib-dimple is 1.21 to 1.76 times of that of circular dimples, with a friction factor of 1.96 to 3.89 times of that of circular dim- pies. Both the depth and Reynolds number of V-shaped rib can influence the flow field structure. The overall thermal performance factor of the V-shaped rib-dimple with a depth of 0. 6 and 1.0 mm is 4.7% to12.8o//oo higher than with a depth of 1.5 mm at a low Reynolds number （Re%20 000）. With a continuous increase of the Reynolds number, the overall thermal performance of V-shaped rib-dimple with a depth of 0.6 and 1.0 mm depth gradually decreases, but the overall thermal performance of V-shaped rib-dimple with a depth of 1.5 mm gradually increases, and is 4.7% to 8.3% higher than that with the depths of 0.6 and 1.0 mm.