Numerical Analysis of Flame Shape Impact On the Performance of Fuel Staging in a Lean-Burn Aeronautical Burner

IF 1.4 4区 工程技术 Q3 ENGINEERING, MECHANICAL Journal of Engineering for Gas Turbines and Power-transactions of The Asme Pub Date : 2023-10-13 DOI:10.1115/1.4063741
Leo C. C. Mesquita, Aymeric Vié, Sébastien Ducruix
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Abstract

Abstract The BIMER combustor is a lab-scale burner investigating fuel staging techniques as a stabilisation strategy for lean premixed prevaporized combustion for aeronautical applications. Two stages compose its injection system: the pilot and the multipoint stages. The staging factor is defined as the ratio of fuel mass flow rate injected through the pilot stage over the total one. As three flame shapes were found experimentally, Large-Eddy Simulations are performed in this study to assess the impact of the flame shape on the combustion regime and stability of the burner. Two operating conditions were explored experimentally (pilot-only and multipoint-dominated) to validate the simulations and compare the three flames. An additional multipoint-only condition is also investigated for the V flame. The burning regimes (premixed and non-premixed) and noise signatures (as a function of fuel staging) were compared to check whether these flames could benefit from the staging strategy. The M and Tulip flame combustion regimes are little affected by fuel staging, remaining mostly premixed and non-premixed, respectively, regardless of fuel staging. In opposition, the V flame changes from being mostly non-premixed to completely premixed when the injection is changed from pilot-only to multipoint-only. For the same staging evolution, the V flame also emits less noise for the investigated points. These results show that the V flame shape is the only one that allows this burner to benefit from an efficient fuel staging strategy.
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细燃式航空燃烧器火焰形状对燃料分级性能影响的数值分析
BIMER燃烧器是一个实验室规模的燃烧器,研究燃料分级技术作为航空应用的稀薄预混预汽化燃烧的稳定策略。它的喷射系统由两级组成:先导级和多点级。分级系数定义为通过先导级注入的燃料质量流量与总流量之比。由于实验中发现了三种火焰形状,本研究进行了大涡模拟,以评估火焰形状对燃烧器燃烧状态和稳定性的影响。实验探索了两种操作条件(仅驾驶员和多点主导)来验证模拟并比较三种火焰。另外还研究了V型火焰的多点条件。将燃烧状态(预混和非预混)和噪声特征(作为燃料分级的函数)进行比较,以检查这些火焰是否可以从分级策略中受益。M型和郁金香型火焰的燃烧方式受燃料分级的影响很小,无论燃料分级如何,它们分别保持着预混和非预混状态。相反,当喷射由先导型变为多点型时,V型火焰从大部分未预混变为完全预混。对于相同的分期演变,V型火焰对所研究的点也发出较少的噪声。这些结果表明,V型火焰形状是唯一一种允许燃烧器受益于有效的燃料分级策略。
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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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