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Hydrogen-blended fuels: Nonlinear flame dynamics and safe operation limits

Gopinathan, Sreenath Malamal; Surendran, Aswathy; Heckl, Maria A.

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Authors

Sreenath Malamal Gopinathan

Aswathy Surendran



Abstract

This paper presents a two-part study on laminar hydrogen-blend flames in a micromix combustion test rig. The first part of the study focuses on the nonlinear dynamics of the flame, which is modelled by the G-equation. The laminar flame speed and the amplitude of convected velocity perturbations are the key parameters. Both have a marked effect on the travel times associated with the convected perturbations. These travel times are quantified and represented as functions of the laminar flame speed and the perturbation amplitude. The second part of the study considers a combustion test rig with the hydrogen-blend flame considered in the first part. A Green’s function approach is used to calculate the complex eigenfrequencies of the complete combustion system. The key parameters are the hydrogen concentration, equivalence ratio and amplitude of velocity fluctuations. The following regions are identified in this 3-D parameter space: regions of thermoacoustic instability, stable limit cycles and flame flashback. This information gives the safe operation limits.

Citation

Gopinathan, S. M., Surendran, A., & Heckl, M. A. (in press). Hydrogen-blended fuels: Nonlinear flame dynamics and safe operation limits. International Journal of Hydrogen Energy, 111, 371-384. https://doi.org/10.1016/j.ijhydene.2025.02.172

Journal Article Type Article
Acceptance Date Feb 10, 2025
Online Publication Date Feb 26, 2025
Deposit Date Mar 13, 2025
Publicly Available Date Mar 13, 2025
Journal International Journal of Hydrogen Energy
Print ISSN 0360-3199
Electronic ISSN 1879-3487
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 111
Pages 371-384
DOI https://doi.org/10.1016/j.ijhydene.2025.02.172
Keywords Nonlinear flame dynamics, Hydrogen-blend flames, Perturbation travel times, Green’s function, Stability analysis, Flashback
Public URL https://keele-repository.worktribe.com/output/1105324
Publisher URL https://www.sciencedirect.com/science/article/pii/S0360319925007372?via%3Dihub

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