Thermoacoustic Characterization of a Premixed Multi Jet Burner for Hydrogen and Natural Gas Combustion

IF 1.4 4区 工程技术 Q3 ENGINEERING, MECHANICAL
Jan Paul Beuth, Johann Moritz Reumschüssel, Jakob G.R. von Saldern, Dominik Wassmer, Bernhard Cosic, Christian Oliver Paschereit, Kilian Oberleithner
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Abstract

Abstract In this study, the acoustics and flame dynamics of a prototype multi jet burner with 19 individual mixing tubes for operation with pure hydrogen and pure natural gas are experimentally investigated. The burner transfer matrix of the jet burner is determined from experimental data and acoustic network modeling, showing very good agreement. A comparison of the flame dynamics of the two fuels considering mass flow and equivalence ratio variation reveals that the flame transfer functions (FTFs) are dominated by a convective mechanism originating from the upstream end of the mixing tubes where the fuel is injected. Consequently, these are most likely fluctuations in the equivalence ratio that feature two characteristic time scales: the convection time in the mixing tubes and along the flame. The overall qualitative shape of the FTFs for hydrogen and natural gas at equal thermal power is found to be similar, with the dynamics of the natural gas flames being more responsive to acoustic excitation. Distinctly less pronounced phase decays are observed for hydrogen compared to natural gas operation. Moreover, the FTFs for H2 are found to change only slightly across the considered range of equivalence ratios. At the same time we observe only small changes in the corresponding static flame shapes. These observation are consistent with the hypothesis of a dominant convective mechanism. In conclusion, the study provides valuable information on the acoustics and flame dynamics of multi jet burners for flexible fuel operation.
用于氢气和天然气燃烧的预混多喷嘴燃烧器的热声特性
摘要本文对19根独立混合管的多喷嘴燃烧器原型在纯氢气和纯天然气条件下的声学和火焰动力学进行了实验研究。根据实验数据和声学网络模型确定了射流燃烧器的燃烧器传递矩阵,结果吻合较好。考虑质量流和等效比变化的两种燃料的火焰动力学比较表明,火焰传递函数(FTFs)主要由源自燃料注入混合管上游端的对流机制控制。因此,这些很可能是等效比的波动,具有两个特征时间尺度:混合管中的对流时间和沿火焰的对流时间。在相同的热功率下,氢气和天然气火焰的整体定性形状相似,天然气火焰的动力学对声激励的响应更大。与天然气操作相比,氢的相位衰减明显不那么明显。此外,发现H2的ftf在考虑的等效比率范围内仅略有变化。同时,我们只观察到相应静态火焰形状的微小变化。这些观测结果与占优对流机制的假设相一致。总之,该研究为灵活燃料运行的多喷嘴燃烧器的声学和火焰动力学提供了宝贵的信息。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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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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