氢富集对完全和技术预混旋转火焰传递基质的影响

IF 1.4 4区 工程技术 Q3 ENGINEERING, MECHANICAL
Audrey Blondé, Bruno Schuermans, Khushboo Pandey, Nicolas Noiray
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引用次数: 0

摘要

了解火焰对声扰动的响应对于预测燃气轮机燃烧室的热声不稳定性至关重要。然而,在实际系统中,测量连接火焰上游和下游声学量的传递函数是非常具有挑战性的,这些测量结果可能明显偏离最先进的模型。此外,关于氢气富集对天然气(NG)火焰响应的影响的研究还很缺乏。在这项工作中,在具有轴向旋流燃烧器的大气燃烧室中,对湍流H2/NG火焰的火焰传递矩阵(FTM)进行了测量,使我们能够揭示完全预混(FP)和技术预混(TP)条件下FTM之间的过渡。此外,还获得了OH*化学发光成像和OH平面激光诱导荧光成像,表征了不同H2分数和混合条件下火焰的拓扑结构。使用多传声器方法测量H2馏分的转移矩阵,功率范围为12%至43%。然后,利用火焰的Rankine-Hugoniot跳变条件,得到了火焰传递函数(FTFs),该传递函数将热释放率的相干波动与声速振荡线性相关。利用OH*化学发光强度作为热释放率的替代指标,提取了基于该光学测量的FTF,并与多传声器方法获得的FTF进行了比较。正如预期的那样,这两种不同的方法对于FP的情况非常一致,而对于TP的情况则有很大的不同。实际上,当声强迫在火焰处引起等效比波动时,化学发光波动不能直接与热释放率波动联系起来,这使得光学方法无法用于TP构型。我们还表明,这两种方法在探索的激励频率范围的高端一致,我们提供了一个解释这一有趣的发现。此外,我们还研究了FTM测量在FP条件下对钻机中声速估计的灵敏度。最后,用基于多分布时延的FTF模型拟合实测的FTF。这使我们能够解释在FP和TP条件下增益和相位的频率依赖性和氢分数依赖性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Effect of Hydrogen Enrichment On Transfer Matrices of Fully and Technically Premixed Swirled Flames
Abstract Knowledge of flame responses to acoustic perturbations is of utmost importance to predict thermoacoustic instabilities in gas turbine combustors. However, measuring transfer functions linking acoustic quantities upstream and downstream of flames are very challenging in practical systems and these measurements can significantly deviate from state-of-the-art models. Moreover, there is a lack of studies investigating the effect of hydrogen enrichment on the response of natural gas (NG) flames. In this work, measurements of flame transfer matrices (FTMs) of turbulent H2/NG flames in an atmospheric combustor featuring an axial swirler burner have been performed, allowing us to unravel the transition between FTM in fully premixed (FP) and in technically premixed (TP) conditions. Furthermore, imaging of OH* chemiluminescence and OH-planar laser induced fluorescence are obtained for characterizing the topology of the flame for varying H2 fraction and mixing conditions. Transfer matrices are measured using the multimicrophone method for H2 fractions ranging from 12% to 43% in power. Afterward, the flame transfer functions (FTFs), which linearly relate the coherent fluctuations of the heat release rate to the acoustic velocity oscillations, are obtained from the FTM by using the Rankine–Hugoniot jump conditions across the flame. Using the OH* chemiluminescence intensity as a surrogate for the heat release rate, the FTF based on this optical measurement is also extracted and compared to the one exclusively obtained with the multimicrophone method. As expected, the two different methods are in very good agreement for the FP case and significantly differ for the TP case. Indeed, chemiluminescence fluctuations cannot be directly linked to heat release rate fluctuations when the acoustic forcing induces equivalence ratio fluctuations at the flame, making the optical method unusable for TP configurations. We also show that the two methods agree in the high end of the explored excitation frequency range and we provide an explanation to this intriguing finding. Moreover, we investigate the sensitivity of the FTM measurement to the estimate of the speed of sound in the rig in FP conditions. Finally, the measured FTFs are fitted with FTF models based on multiple distributed time delays. This allows us to explain the frequency dependence and the hydrogen fraction dependence of the gain and the phase in FP and TP conditions.
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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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