Experimental and modelling study on the laminar burning velocity correlation of CH4 flames diluted by different diluents

•New SL experiment of CH4 flames diluted by N2/AR/CO2 covering unexplored conditions.•Linear lnSL vs. 1Yu relationships across N2, CO2, H2O, AR, and HE diluted flames.•Validity of the correlation for multiple-diluent conditions in real applications.•Mathematical fitted results provided for the engin...

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Veröffentlicht in:Fuel (Guildford) 2024-08, Vol.370, p.131860, Article 131860
Hauptverfasser: Han, Xinlu, Ling, Zhongqian, Zhang, Guangxue, Yuan, Dingkun, Xu, Jiangrong
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Sprache:eng
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Zusammenfassung:•New SL experiment of CH4 flames diluted by N2/AR/CO2 covering unexplored conditions.•Linear lnSL vs. 1Yu relationships across N2, CO2, H2O, AR, and HE diluted flames.•Validity of the correlation for multiple-diluent conditions in real applications.•Mathematical fitted results provided for the engineering usage.•Linear dTdxmax vs. f and HRRmax vs. f2 dependences offer insight for flame analysis. Introducing diluents is a typical technique in the modern combustion process to control pollutant emissions. While extensive research in literature has explored the inerting effects of different diluents on the CH4 flame laminar burning velocities through experiments and numerical simulations, applying these findings directly to real applications is often impractical. A more efficient approach is the utilization of correlation equations. This study validates a linear correlation proposed in our former work (Fuel 2024;364:131108) for the CH4 flames diluted by N2, CO2, H2O, Ar, and He. Laminar burning velocities of CH4 + O2 + N2, CH4 + O2 + Ar, and CH4 + O2 + CO2 flames under varying diluent types, dilution ratios, and equivalence ratios were measured by the heat flux method at 1 atm and 298 K to provide precise validation data. Simulations were also conducted using four recently published mechanisms. The experimental and simulation results demonstrate strong linearity in the proposed correlation for CH4 + O2 flames diluted by N2, CO2, H2O, Ar, and He, regardless of equivalence ratios. Furthermore, considering real applications such as exhaust gas recirculation, the study also validates the correlation’s applicability under conditions involving multiple diluents. To facilitate practical engineering applications, mathematically fitted results of the correlation equations for single and multiple diluents are provided in both mass- and mole-based units.
ISSN:0016-2361
1873-7153
DOI:10.1016/j.fuel.2024.131860