The effect of hydrogen on nonlinear flame saturation

Æsøy, Eirik; Indlekofer, Thomas; Bothien, Mirko; Dawson, James R.

doi:10.1115/1.4063316

Please use this identifier to cite or link to this item: https://doi.org/10.21256/zhaw-29606

Publication type:	Article in scientific journal
Type of review:	Peer review (publication)
Title:	The effect of hydrogen on nonlinear flame saturation
Authors:	Æsøy, Eirik Indlekofer, Thomas Bothien, Mirko Dawson, James R.
et. al:	No
DOI:	10.1115/1.4063316 10.21256/zhaw-29606
Published in:	Journal of Engineering for Gas Turbines and Power
Volume(Issue):	145
Issue:	11
Issue Date:	2023
Publisher / Ed. Institution:	The American Society of Mechanical Engineers
ISSN:	0742-4795 1528-8919
Language:	English
Subjects:	Hydrogen; Flame transfer function; Nonlinear; Saturation; Thermoacoustics
Subject (DDC):	620: Engineering
Abstract:	We investigate the effect of increasing levels of hydrogen enrichment on the nonlinear response and saturation of premixed bluff-body stabilized methane/hydrogen flames submitted to acoustic forcing. The thermal power is kept approximately constant to preserve the nozzle velocity while increasing the flame speed through hydrogen enrichment. The flame describing function (FDF) is measured for a fixed frequency and three hydrogen–methane blends ranging from 10% to 50% by power, corresponding to 25% to 75% by volume. We show that when the flame is forced at the same frequency at similar power and bulk velocities, increasing levels of hydrogen enrichment increase the saturation amplitude of the flame. To provide insight into the flame dynamics responsible for the change in the global nonlinear response and saturation amplitude, the flames were investigated using high-speed imaging in combination with OH planar laser-induced fluorescence (OH-PLIF) at a range of forcing amplitudes. At lower hydrogen concentrations, the flame is stabilized along the inner shear layer and saturation in the heat release rate (HRR) occurs at lower forcing amplitudes due to large-scale flame–vortex interactions causing flame annihilation as observed in several previous studies. At increased levels of hydrogen enrichment, distinctly different flame dynamics are observed. In these cases, the flame accelerates and propagates across to the outer shear layer, which acts to suppress large-scale flame annihilation during roll-up of both the inner and outer shear layers. This results in a coherent increase in flame surface area with forcing amplitudes significantly increasing the saturation amplitude of the flame. These results show that high levels of hydrogen increase the amplitude response to acoustic forcing leading to higher saturation amplitudes. This suggests that substituting natural gas with hydrogen in gas turbines increases the risk of much higher limit-cycle amplitudes if self-excited instabilities occur.
URI:	https://digitalcollection.zhaw.ch/handle/11475/29606
Fulltext version:	Accepted version
License (according to publishing contract):	CC BY 4.0: Attribution 4.0 International
Departement:	School of Engineering
Organisational Unit:	Institute of Energy Systems and Fluid Engineering (IEFE)
Appears in collections:	Publikationen School of Engineering

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Æsøy, E., Indlekofer, T., Bothien, M., & Dawson, J. R. (2023). The effect of hydrogen on nonlinear flame saturation. Journal of Engineering for Gas Turbines and Power, 145(11). https://doi.org/10.1115/1.4063316

Æsøy, E. et al. (2023) ‘The effect of hydrogen on nonlinear flame saturation’, Journal of Engineering for Gas Turbines and Power, 145(11). Available at: https://doi.org/10.1115/1.4063316.

E. Æsøy, T. Indlekofer, M. Bothien, and J. R. Dawson, “The effect of hydrogen on nonlinear flame saturation,” Journal of Engineering for Gas Turbines and Power, vol. 145, no. 11, 2023, doi: 10.1115/1.4063316.

ÆSØY, Eirik, Thomas INDLEKOFER, Mirko BOTHIEN und James R. DAWSON, 2023. The effect of hydrogen on nonlinear flame saturation. Journal of Engineering for Gas Turbines and Power. 2023. Bd. 145, Nr. 11. DOI 10.1115/1.4063316

Æsøy, Eirik, Thomas Indlekofer, Mirko Bothien, and James R. Dawson. 2023. “The Effect of Hydrogen on Nonlinear Flame Saturation.” Journal of Engineering for Gas Turbines and Power 145 (11). https://doi.org/10.1115/1.4063316.

Æsøy, Eirik, et al. “The Effect of Hydrogen on Nonlinear Flame Saturation.” Journal of Engineering for Gas Turbines and Power, vol. 145, no. 11, 2023, https://doi.org/10.1115/1.4063316.