Assessment of the LES-FGM framework for capturing stable and unstable modes in a hydrogen / methane fuelled premixed combustor

IF 5.8 2区工程技术 Q2 ENERGY & FUELS Combustion and Flame Pub Date : 2023-09-01 DOI:10.1016/j.combustflame.2023.112904

Jen Zen Ho , Sandeep Jella , Mohsen Talei , Gilles Bourque , Thomas Indlekofer , James Dawson

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引用次数: 1

Abstract

The main objective of this paper is to assess the capability of compressible Large Eddy Simulations (LES) to capture azimuthal combustion instability. The thickened flame model coupled with Flamelet Generated Manifold (FGM) tabulated chemistry is used as the combustion model. LES of an annular combustor is performed for five cases featuring stable and unstable combustion of hydrogen-methane mixtures. The unstable modes feature azimuthal instabilities and this annular combustor is used to test the LES-FGM framework. A consistent methodology is applied across all cases. It is found that LES predicts azimuthal modes for stable cases but these modes are weak and intermittent with pressure fluctuation amplitudes within the order of experimental noise. In addition, the unstable cases capture azimuthal modes that have approximately the same frequency as that of the experiment though the amplitudes of the modes are over-predicted. This suggests that the described LES-FGM framework is able to predict the onset of thermoacoustic instabilities and their qualitative changes with addition of hydrogen.

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氢/甲烷燃料预混燃烧室捕获稳定和不稳定模式的LES-FGM框架的评估

本文的主要目的是评估可压缩大涡模拟(LES)捕捉方位燃烧不稳定性的能力。燃烧模型采用加厚火焰模型与火焰生成歧管(FGM)化学表相结合的燃烧模型。对一个环形燃烧器进行了氢-甲烷混合物稳定燃烧和不稳定燃烧的五种情况的LES实验。不稳定模态具有方位不稳定性，利用环形燃烧室对LES-FGM框架进行了测试。在所有案例中应用一致的方法。研究发现，在稳定情况下，LES可以预测出方位模态，但这些模态是微弱的、间歇性的，压力波动幅度在实验噪声的数量级内。此外，不稳定情况下捕获的方位角模态与实验的频率大致相同，尽管这些模态的振幅被高估了。这表明所描述的LES-FGM框架能够预测热声不稳定性的开始及其随着氢的加入而发生的定性变化。

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来源期刊

Combustion and Flame 工程技术-工程：化工

CiteScore

9.50

自引率

20.50%

发文量

631

审稿时长

3.8 months

期刊介绍： The mission of the journal is to publish high quality work from experimental, theoretical, and computational investigations on the fundamentals of combustion phenomena and closely allied matters. While submissions in all pertinent areas are welcomed, past and recent focus of the journal has been on: Development and validation of reaction kinetics, reduction of reaction mechanisms and modeling of combustion systems, including: Conventional, alternative and surrogate fuels; Pollutants; Particulate and aerosol formation and abatement; Heterogeneous processes. Experimental, theoretical, and computational studies of laminar and turbulent combustion phenomena, including: Premixed and non-premixed flames; Ignition and extinction phenomena; Flame propagation; Flame structure; Instabilities and swirl; Flame spread; Multi-phase reactants. Advances in diagnostic and computational methods in combustion, including: Measurement and simulation of scalar and vector properties; Novel techniques; State-of-the art applications. Fundamental investigations of combustion technologies and systems, including: Internal combustion engines; Gas turbines; Small- and large-scale stationary combustion and power generation; Catalytic combustion; Combustion synthesis; Combustion under extreme conditions; New concepts.