Influence of premixed swirl-stabilized flame on the cooling performance of an effusion-cooled combustor liner

IF 6.4 2区工程技术 Q1 THERMODYNAMICS Case Studies in Thermal Engineering Pub Date : 2025-04-01 Epub Date: 2025-02-28 DOI:10.1016/j.csite.2025.105938

Xiang Lu , Yongbin Ji , Bing Ge , Shusheng Zang

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Abstract

The impact of premixed swirl-stabilized flame on the cooling performance of an effusion-cooled combustor liner perforated by cylindrical and fan-shaped holes is investigated under varying blowing ratios. Infrared technology is employed to ascertain the wall temperature, and computations are performed to elucidate the interaction mechanism between the flame and the cooling jets. The results demonstrate that since the premixed flame has not yet burnt out before impinging on the wall, the mainstream near the wall contains low-temperature mixtures in the swirl impingement zone and high-temperature gas in the corner recirculation and liner tail. Consequently, the wall temperature in the swirl impingement zone is relatively low, while the cooling effectiveness is high. Conversely, the corner circulation zone and the tail of the liner exhibit reduced cooling effectiveness. The increase in the blowing ratios has a negligible influence on the cooling effectiveness distribution but can enhance the cooling effectiveness and its uniformity. The fan-shaped holes are similar in the distribution of cooling effectiveness to the cylindrical ones but higher in value. Meanwhile, they have better uniformity of cooling effectiveness than the cylindrical holes, as more cooling air is assigned to holes in the corner recirculation zone and liner tail where cooling effectiveness is lower.

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预混合旋流稳定火焰对射流冷却燃烧室内衬冷却性能的影响

研究了不同吹气比下，预混旋流稳定火焰对射流冷却燃烧室圆柱孔和扇形孔的冷却性能的影响。利用红外技术确定了壁面温度，并通过计算分析了火焰与冷却射流的相互作用机理。结果表明，由于预混火焰在撞击壁面前尚未燃灭，因此在壁面附近的主流中，涡流撞击区含有低温混合物，而在角落再循环和尾管尾部则含有高温气体。因此，在涡流冲击区壁面温度相对较低，而冷却效率较高。相反，转角循环区和尾管的冷却效果降低。吹气比的增加对冷却效率分布的影响可以忽略不计，但可以提高冷却效率和冷却效率的均匀性。扇形孔的冷却效率分布与圆柱形孔相似，但数值更高。同时，由于冷却效率较低的角落再循环区孔和尾管孔被分配了更多的冷却空气，因此其冷却效率的均匀性优于圆柱孔。

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来源期刊

Case Studies in Thermal Engineering Chemical Engineering-Fluid Flow and Transfer Processes

CiteScore

8.60

自引率

11.80%

发文量

812

审稿时长

76 days

期刊介绍： Case Studies in Thermal Engineering provides a forum for the rapid publication of short, structured Case Studies in Thermal Engineering and related Short Communications. It provides an essential compendium of case studies for researchers and practitioners in the field of thermal engineering and others who are interested in aspects of thermal engineering cases that could affect other engineering processes. The journal not only publishes new and novel case studies, but also provides a forum for the publication of high quality descriptions of classic thermal engineering problems. The scope of the journal includes case studies of thermal engineering problems in components, devices and systems using existing experimental and numerical techniques in the areas of mechanical, aerospace, chemical, medical, thermal management for electronics, heat exchangers, regeneration, solar thermal energy, thermal storage, building energy conservation, and power generation. Case studies of thermal problems in other areas will also be considered.