The effect of hydrogen addition on the amplitude and harmonic response of azimuthal instabilities in a pressurized annular combustor

Indlekofer, Thomas; Ahn, Byeonguk; Kwah, Yi Hao; Wiseman, Samuel; Mazur, Marek; Dawson, James; Worth, Nicholas A.

doi:10.1016/j.combustflame.2021.02.015

Cited by 40 publications

(21 citation statements)

References 40 publications

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“…Experimental Setup and Data Acquisition. Figure 1(a) illustrates a cross section of the lab-scale intermediate pressure annular (IPA) combustor [27,28], equipped with swirling injectors. The primary components of the test platform include a mixing chamber, a plenum which is partially filled with glass beads, the annular combustion chamber, and a nozzle plate which chokes the flow at the exit.…”

Section: Methodsmentioning

confidence: 99%

“…Each injector tube has a central rod (D r ¼ 5 mm), which expands linearly at an angle of 38 deg (cone-angle) over a streamwise distance of 10 mm. The diameter of the central rod is D bb ¼ 14 mm at the bluff body, which was increased from the initial design [27] in order to prevent flashback [28]. Counterclockwise six-vane axial swirlers are mounted 33 mm upstream of the dump plane.…”

Section: Methodsmentioning

confidence: 99%

“…However, azimuthal modes were only observed in a flashback state. This motivated the modification of the bluff bodies in a consecutive study [28], allowing long run times and the study of a wide range of operating conditions. A cut-on amplitude of the instabilities was identified above which harmonic contributions become significant and lead to a strong distortion of the phase space.…”

Section: Introductionmentioning

confidence: 99%

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Transient Thermo-Acoustic Responses of Methane/Hydrogen Flames in a Pressurized Annular Combustor

Ahn

Indlekofer

Dawson

et al. 2021

Journal of Engineering for Gas Turbines and Power

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The present article experimentally investigates the triggering and transient growth of azimuthal instabilities in a pressurized laboratory-scale annular combustor featuring twelve methane/hydrogen flames, as the equivalence ratio is ramped up and down. The ramping rate of equivalence ratio is varied to examine its effect on the transient thermoacoustic response and the driving mechanisms, highlighting a number of previously unseen features. As the equivalence ratio is dynamically increased, all cases were observed to feature a distinct modal trajectory, during the onset of high amplitude instabilities. Strongly spinning counter-clockwise modes are first excited before a dynamic transition to strongly spinning clockwise modes occurs. Furthermore, the strength of the spinning mode (quantified through the spin ratio or nature angle) was shown to feature a local minima before the spinning mode stabilized in the system, which corresponds to an almost pure spinning state. Hysteresis behaviour was observed in both the amplitude and nature of the mode, resulting in different thresholds for the onset and decay of the instability, depending on the time history of the combustor. Increasing the ramping rate was found to reduce the amount of hysteresis in the system. Furthermore, the high amplitude of the instability resulted in significant harmonic components. The behaviour of the harmonics generally resembles the fundamental component, albeit with some notable exceptions.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Transient Thermo-Acoustic Responses of Methane/Hydrogen Flames in a Pressurized Annular Combustor

Ahn

Indlekofer

Dawson

et al. 2021

Journal of Engineering for Gas Turbines and Power

Self Cite

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“…Despite these positive aspects, hydrogen shows some other challenging technical issues that must be addressed, such as potential flashback and autoignition due to its significantly higher flame speed and shorter autoignition time. Furthermore, an excessive lean combustion can lead to dangerous thermoacoustic instabilities [12][13][14][15][16][17]. This will require some modifications of current design features.…”

Section: Hydrogenmentioning

confidence: 99%

Recent Combustion Strategies in Gas Turbines for Propulsion and Power Generation toward a Zero-Emissions Future: Fuels, Burners, and Combustion Techniques

et al. 2021

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The effects of climate change and global warming are arising a new awareness on the impact of our daily life. Power generation for transportation and mobility as well as in industry is the main responsible for the greenhouse gas emissions. Indeed, currently, 80% of the energy is still produced by combustion of fossil fuels; thus, great efforts need to be spent to make combustion greener and safer than in the past. For this reason, a review of the most recent gas turbines combustion strategy with a focus on fuels, combustion techniques, and burners is presented here. A new generation of fuels for gas turbines are currently under investigation by the academic community, with a specific concern about production and storage. Among them, biofuels represent a trustworthy and valuable solution in the next decades during the transition to zero carbon fuels (e.g., hydrogen and ammonia). Promising combustion techniques explored in the past, and then abandoned due to their technological complexity, are now receiving renewed attention (e.g., MILD, PVC), thanks to their effectiveness in improving the efficiency and reducing emissions of standard gas turbine cycles. Finally, many advances are illustrated in terms of new burners, developed for both aviation and power generation. This overview points out promising solutions for the next generation combustion and opens the way to a fast transition toward zero emissions power generation.

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“…Several research groups are working both on experimental and numerical activities concerning the premixed combustion of natural gas enriched with hydrogen [10]. Furthermore, an excessive lean combustion can cause the occurrence of dangerous thermoacoustic instabilities [11][12][13][14][15]. Usually, in the numerical approach, the mixture of fuel and oxidizer is assumed perfectly premixed.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the partially premixed combustion in a labscale swirl-stabilized burner fueled by a methane-hydrogen mixture

Stefanizzi

Ceglie

et al. 2021

E3S Web Conf.

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Nowadays hydrogen is gaining more and more attention by Industry, Academia and Politics. Being a carbon free fuel, it is supposed to have a key role in the future energy scenario, especially if produced by renewable sources. The use of mixtures of hydrogen and conventional hydrocarbons in gas turbines is one of the most promising technical solutions for obtaining a sustainable combustion during the transition toward a full decarbonization. For this reason, it is fundamental to investigate the behaviour of fuels enriched with hydrogen in combustion processes. In this work, a lab-scale swirled premixed burner has been investigated by means of a fully 3D URANS approach. Firstly, a numerical simulation with cold flow has been performed to validate the model against experimental data. Then, reactive flow simulations have been performed. Initially, a combustion with 100% methane was considered. Then, a 30% by volume hydrogen blending has been investigated. The partially premixed combustion model has been implemented to take into account the inhomogeneities of the mixture at the chamber inlet. The variation of the flame structure due to the hydrogen enrichment will be described in terms of the temperature and species concentration distributions.

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The effect of hydrogen addition on the amplitude and harmonic response of azimuthal instabilities in a pressurized annular combustor

Cited by 40 publications

References 40 publications

Transient Thermo-Acoustic Responses of Methane/Hydrogen Flames in a Pressurized Annular Combustor

Transient Thermo-Acoustic Responses of Methane/Hydrogen Flames in a Pressurized Annular Combustor

Recent Combustion Strategies in Gas Turbines for Propulsion and Power Generation toward a Zero-Emissions Future: Fuels, Burners, and Combustion Techniques

Analysis of the partially premixed combustion in a labscale swirl-stabilized burner fueled by a methane-hydrogen mixture

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