具有微小V肋-凹陷复合结构表面湍流传热实验研究

摘要/Abstract

摘要：

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(Re)在10 000~60 000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Re<20 000的条件下，具有0.6和1.0 mm高的V肋复合结构表面的综合热性能比具有1.5 mm高的V肋凹陷表面高约4.7%~12.8%；随着Re继续提高，0.6 和1.0 mm V肋-凹陷的综合换热能力逐渐降低，而1.5 mm V肋-凹陷的综合换热能力逐渐上升，且比0.6 和1.00 mm V肋-凹陷高约4.7%~8.3%.

关键词: , V形肋, 凹陷涡发生器, 瞬态液晶热像, 对流冷却, 燃气轮机

Abstract:

Abstract： A structured surface with smallsized V ribs and dimples is a potentially highperformance cooling structure used for gas turbine blades. A comparative transient liquid crystal (TLC) transient experimental 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 Nusselt 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 dimples. 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% to 12.8% 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.

Key words: V rib, dimple, transient liquid crystal thermography (TLCT), convective cooling, gas turbine

中图分类号:

TK 124

邢建峰1，饶宇1，李博2，饶琨3. 具有微小V肋-凹陷复合结构表面湍流传热实验研究[J]. 上海交通大学学报（自然版）, 2017, 51(1): 40-.

XING Jianfeng1,RAO Yu1,LI Bo2,RAO Kun3. An Experimental Study of Turbulent Flow and Heat Transfer in a Cooling Channel with Small V RibDimple Compound Structure[J]. Journal of Shanghai Jiaotong University, 2017, 51(1): 40-.

参考文献

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