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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。
The concave vortex generator is a kind of efficient turbine blade cooling structure of gas turbine. In this paper, the heat transfer and fluid flow performance of the spherical and teardrop-shaped vortex generator array are studied experimentally and numerically. In this paper, the turbulent heat transfer and flow resistance performance of the surface of the vortex vortex generator were calculated by using three kinds of turbulence models, namely Standard κ-ω, SST and Reliazable κ-ε, respectively. Compared with the experimental results, it was confirmed that Standard κ- The most accurate flow turbulence model. Through this research, the heat transfer, flow resistance and flow characteristics of spherical and teardrop-shaped recessed vortex generators in the Reynolds number range of 8500 ~ 60000 were obtained. The experimental results show that the heat transfer performance of the spherical depression increases by about 60% and the friction factor increases by about 70% compared with the turbulent flow in the smooth passage. The heat transfer performance of the tear drop depression is increased by about 90% and the friction factor is doubled. Teardrop-shaped depression shows better heat transfer performance and overall thermal performance.