燃气轮机燃烧器漩涡撞击下的孔构造对喷流冷却效果的影响

IF 4.9 2区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Thermal Sciences Pub Date : 2024-05-22 DOI:10.1016/j.ijthermalsci.2024.109164

Xiang Lu , Yuliang Jia , Yongbin Ji , Bing Ge , Shusheng Zang

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引用次数: 0

摘要

在吹气比为 1.2 到 6.0 的实际漩涡流条件下，研究了圆柱形和扇形孔结构的喷出冷却特性。使用 k-ω SST 模型进行 RANS 计算，以评估漩涡主流和冷却空气之间的相互作用。结果表明，圆柱形和扇形孔配置的冷却效果分布同样受漩涡影响的控制。在漩涡主流冲击衬壁的位置附近出现了两个高温区。扇形孔结构具有更高的冷却效果，而这种差异是相对于位置而言的。从数量上分析，在冲击区，扇形孔比圆柱形孔高 19.7 %-53.2 %。在转角再循环区，差异从 39.1% 到 84.2% 不等。计算结果表明，由于扇形孔的出口速度较低，漩涡流与冷却射流之间的相互作用更强。因此，在低 BR 条件下，冷却空气更容易受到漩涡冲击的抑制，而增大吹风比可以增强冷却空气对漩涡流的阻力。

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Effect of the hole configurations on effusion cooling effectiveness under swirl impact in gas turbine combustor

Effusion cooling characteristics of the cylindrical and fan-shaped hole configurations are studied under realistic swirl flows at blowing ratios ranging from 1.2 to 6.0. RANS computations with the k-ω SST model are used to evaluate the interaction between swirl mainstream and cooling air. The results show that the cooling effectiveness distribution for the cylindrical and fan-shaped hole configurations are similarly controlled by swirl impact. Two high-temperature regions emerge near the impact location of the swirl main flow on the liner wall. The fan-shaped hole configuration has higher cooling effectiveness, and the difference is relative to location. Quantitatively analyzing, the fan-shaped holes are 19.7 %–53.2 % higher than the cylindrical holes in impact zones. In the corner recirculation zone, the difference ranges from 39.1 % to 84.2 %. The computations reflect the interaction between swirl flows and cooling jets is stronger for fan-shaped holes due to lower outlet velocity. Therefore the cooling air is easier to be suppressed by swirl impact under low BR, while the increasing blowing ratio can enhance the resistance of cooling air against swirl flows.

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来源期刊

International Journal of Thermal Sciences 工程技术-工程：机械

CiteScore

8.10

自引率

11.10%

发文量

531

审稿时长

55 days

期刊介绍： The International Journal of Thermal Sciences is a journal devoted to the publication of fundamental studies on the physics of transfer processes in general, with an emphasis on thermal aspects and also applied research on various processes, energy systems and the environment. Articles are published in English and French, and are subject to peer review. The fundamental subjects considered within the scope of the journal are: * Heat and relevant mass transfer at all scales (nano, micro and macro) and in all types of material (heterogeneous, composites, biological,...) and fluid flow * Forced, natural or mixed convection in reactive or non-reactive media * Single or multi–phase fluid flow with or without phase change * Near–and far–field radiative heat transfer * Combined modes of heat transfer in complex systems (for example, plasmas, biological, geological,...) * Multiscale modelling The applied research topics include: * Heat exchangers, heat pipes, cooling processes * Transport phenomena taking place in industrial processes (chemical, food and agricultural, metallurgical, space and aeronautical, automobile industries) * Nano–and micro–technology for energy, space, biosystems and devices * Heat transport analysis in advanced systems * Impact of energy–related processes on environment, and emerging energy systems The study of thermophysical properties of materials and fluids, thermal measurement techniques, inverse methods, and the developments of experimental methods are within the scope of the International Journal of Thermal Sciences which also covers the modelling, and numerical methods applied to thermal transfer.