Wondra C, Feldner A, Treiber P, Karl J (2026)
Publication Type: Journal article
Publication year: 2026
Book Volume: 32
Article Number: 111849
DOI: 10.1016/j.rineng.2026.111849
Laminar flame speed is a key parameter governing flame stabilization, flashback, and blow-off in premixed combustion systems. This study presents a simplified and automated optical cone-angle method based on bounding-box image evaluation for estimating apparent laminar flame speeds of methane-based and biomass-derived syngas mixtures. The method was validated using methane-air reference flames and subsequently applied to CH4/H2 mixtures, methane flames diluted with CO2 and N2, and two representative biomass-derived syngas compositions. Compared to literature heat-flux data, methane measurements reproduced the characteristic equivalence ratio dependence with deviations of approximately 5 – 15 %, consistent with the known stretch and geometric effects of Bunsen-type flames. Hydrogen enrichment significantly increased the apparent laminar flame speed, with a threshold-like acceleration above approximately 45 vol.% H2, whereas inert dilution reduced flame propagation, with CO2 showing a substantially stronger suppressing effect than N2. Hydrogen-rich allothermal syngas exhibited elevated laminar flame speeds of up to 0.56 m/s but only within a narrow stable operating window due to flashback and blow-off limitations. In contrast, methanized autothermal syngas showed combustion behavior close to methane near stoichiometric conditions, as hydrogen enhancement was largely compensated by inert dilution Although the method does not provide unstretched laminar flame speeds, the automated image-based workflow enables rapid and reproducible comparative assessment of syngas combustion behavior across varying fuel compositions and non-ideal flame shapes, making it a practical screening tool for biomass-derived syngas applications.
APA:
Wondra, C., Feldner, A., Treiber, P., & Karl, J. (2026). Laminar flame speed of biomass-derived synthesis gas using a simplified optical approach. Results in Engineering, 32. https://doi.org/10.1016/j.rineng.2026.111849
MLA:
Wondra, Christian, et al. "Laminar flame speed of biomass-derived synthesis gas using a simplified optical approach." Results in Engineering 32 (2026).
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