Laminar burning velocities of rich CH4+N2+O2 flames: A projection to make direct data comparison for highly dispersed experimental conditions.
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| Title: | Laminar burning velocities of rich CH4+N2+O2 flames: A projection to make direct data comparison for highly dispersed experimental conditions. |
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| Authors: | Han, Xinlu1 (AUTHOR), Lin, Fawei1,2 (AUTHOR) linfawei@tju.edu.cn, Konnov, Alexander A.3 (AUTHOR) |
| Source: | Combustion & Flame. Jan2026, Vol. 283, pN.PAG-N.PAG. 1p. |
| Subjects: | Methane, Burning velocity, Data analysis, Combustion kinetics, Atmospheric oxygen, Empirical research, Air-fuel ratio |
| Abstract: | The laminar burning velocity (S L) of methane (CH 4), the primary constituent of natural gas, is a key combustion property essential for validating combustion kinetic models. The present study focuses on the CH 4 S L at the very rich side of flames, where the available experimental data are scarce with highly dispersed measurement conditions, and data projection was carried out to overcome the difficulty in making direct data comparison and subsequent kinetic model validation. To validate the projection method, new measurements were performed across various equivalence ratios (1.6 - 2.3), unburnt temperatures (298 K - 448 K), and oxygen ratios in the O 2 +N 2 oxidizer (0.30 - 0.38), with many conditions not explored in existing literature. Six widely-used kinetic models were adopted for simulations, together with reaction sensitivity analyses, which revealed consistent reactions governing the S L dependences on the unburnt temperatures and oxygen ratios. Similar flame conditions with nearly identical A-factor S L sensitivity values were also identified, with a parameter ζ A − B introduced to describe the S L ratio between conditions A and B within a similar flame condition area. The very low reaction sensitivities of ζ A − B allow any model to accurately reflect ζ A − B regardless of its accuracy in predicting S L. Using the simulated ζ A − B , all available data at 1 atm were projected to conditions with unburnt temperature 377 K and various oxygen ratios, through which inconsistencies among different experimental datasets were revealed, indicating some of the measurements should have larger actual uncertainties than reported. Moreover, all six models significantly underestimate the S L for flames with an equivalence ratio of 1.5 and low oxygen ratios and overestimate the equivalence ratio 2.5 results, indicating room for further improvement of these models. Besides, the projection method proposed in the present study can potentially be applied to other types of flames, helping data comparison and kinetic model validation. [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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