Reacting Flow Prediction of the Low-Swirl Lifted Flame in an Aeronautical Combustor with Angular Air Supply

IF 1.4 4区 工程技术 Q3 ENGINEERING, MECHANICAL
Sven Hoffmann, Rainer Koch, Hans-Jörg Bauer
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引用次数: 0

Abstract

Abstract By tilting the burners of an annular aeronautical combustor in circumferential direction, the potential of increased combustion stability is opened up due to an enhanced exhaust gas recirculation between adjacent flames. The innovative gas turbine combustor concept, called the Short Helical Combustor (SHC), allows the main reaction zone to be operated at low equivalence ratios. A lean lifted flame is implemented in the staggered SHC burner arrangement. The objective is to reach ultra-low NOx emissions by extensive premixing of fuel and air upstream of the lean reaction zone. In the present work, a modeling approach is developed to investigate the characteristics of the lifted flame, using the gaseous fuel methane. It is demonstrated that by using the Large Eddy Simulation method, the shape and lift-off height of the flame is adequately reproduced by means of the finite-rate chemistry approach. For the numerical prediction of the lean lifted flame in the SHC arrangement, the focus is on the interaction of adjacent burners. It is shown that the swirling jet flow is deflected towards the sidewall of the staggered combustor dome, which is attributed to the asymmetrical confinement. Since the stabilization mechanism of the low-swirl flame relies on outer recirculation zones, the upstream transport of hot combustion products back to the flame base is studied by the variation of the combustor confinement ratio. It turns out that increasing the combustor size amplifies the exhaust gas recirculation along the sidewall, and increases the temperature of recirculating burned gases.
角送风航空燃烧室低旋流提升火焰的反应流动预测
通过在周向倾斜燃烧器的环形航空燃烧室,增加燃烧稳定性的潜力是开放的,因为一个增强的废气再循环之间的相邻火焰。创新的燃气轮机燃烧室概念,称为短螺旋燃烧室(SHC),允许主反应区在低当量比下运行。在交错SHC燃烧器布置中实现了倾斜提升火焰。目标是通过在贫反应区上游广泛预混燃料和空气来达到超低氮氧化物排放。在本工作中,开发了一种利用气体燃料甲烷来研究提升火焰特性的建模方法。结果表明,采用大涡模拟方法,用有限速率化学方法可以很好地模拟火焰的形状和起飞高度。对于浅燃层布置中低升焰的数值预测,重点关注的是相邻燃烧器之间的相互作用。结果表明,旋流射流向交错燃烧室圆顶的侧壁偏转,这是由不对称约束引起的。由于低旋流火焰的稳定机制依赖于外部再循环区,因此通过燃烧室约束比的变化研究了燃烧热产物向火焰底部上游的输运。结果表明,增大燃烧室尺寸可以放大废气沿侧壁的再循环,提高再循环燃烧气体的温度。
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来源期刊
CiteScore
3.80
自引率
20.00%
发文量
292
审稿时长
2.0 months
期刊介绍: The ASME Journal of Engineering for Gas Turbines and Power publishes archival-quality papers in the areas of gas and steam turbine technology, nuclear engineering, internal combustion engines, and fossil power generation. It covers a broad spectrum of practical topics of interest to industry. Subject areas covered include: thermodynamics; fluid mechanics; heat transfer; and modeling; propulsion and power generation components and systems; combustion, fuels, and emissions; nuclear reactor systems and components; thermal hydraulics; heat exchangers; nuclear fuel technology and waste management; I. C. engines for marine, rail, and power generation; steam and hydro power generation; advanced cycles for fossil energy generation; pollution control and environmental effects.
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