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Abstract Hydrogen-enriched natural gas combustion is a hot topic in industrial and academic communities due to the need for carbon emission reduction. However, thermoacoustic instability poses a major challenge for lean combustion development, particularly the higher frequency combustion oscillations. This study investigates the flame response in micromix hydrogen/methane flames within a low to medium frequency range of 50 to 1200 Hz, revealing a critical mixing ratio. Above this threshold, the flame response is dominated by hydrogen combustion, whereas below it, methane combustion takes precedence. Overall speaking, the hydrogen addition significantly enlarges the low-pass filter limit of the flame transfer function. Simultaneous OH* chemiluminescence and PIV experiments demonstrate that the gain is associated with the flame size and the number of acoustic-induced vortices on the flame surface. Higher frequency acoustic forcing leads to flame responses out of phase at different longitudinal positions, resulting in a low global flame response. Hydrogen addition reduces the flame length and enhances the FTF gain at specific frequencies.
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Dewen Liu
Zhenzhen Feng
Xiaojing Tian
Journal of Engineering for Gas Turbines and Power
Shanghai Jiao Tong University
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Liu et al. (Fri,) studied this question.
www.synapsesocial.com/papers/68e58936b6db643587525a70 — DOI: https://doi.org/10.1115/1.4066535