High-temperature combustion characteristics of methyl isopropyl Ketone/Air Mixtures: Laminar burning velocity measurement and kinetic model improvement

• LBV of MIPK/air mixtures was measured from 355 to 631 K across ϕ = 0.8–1.3. • Lin model underpredicts LBV at high mixture temperatures with experimental results. • Sensitivity analysis shows C 0 − C 4 species dominate LBV predictions. • Modified R84 coefficients improve LBV predictions at high mixture temperatures. Understanding the combustion of ketones is crucial for their integration into modern energy systems as sustainable, efficient, and environmentally friendly alternatives to conventional fuels, as such studies help optimize engine performance, reduce emissions, and advance the development of next-generation renewable fuel technologies. To achieve these goals, the present study experimentally investigates the laminar burning velocity (LBV) of methyl isopropyl ketone (MIPK)/air mixtures at elevated temperatures up to 631 K and equivalence ratios ( ϕ ) between 0.8 and 1.3, using the externally heated diverging channel method. The models of Li et al. (Combust. Flame 38 (2021) 2135–2142) and Lin et al. (Combust. Flame 258 (2023) 113041) show good agreement with the experimental LBV data at low temperatures but underpredict the LBV at higher mixture temperatures. A sensitivity analysis identified reaction R84 (CH 2 + O 2 → CO 2 + 2H), adopted from NUIGMech1.1 (Combust. Flame 226 (2021) 229–242) in the Lin (Combust. Flame 258 (2023) 113041) model, as a critical target for modification in addressing this discrepancy. In the present work, the rate coefficients of reaction R84, adopted from the latest NUIGMech1.3 (Combust. Flame 248 (2023) 112562) mechanism, have been incorporated into the Lin model to improve its predictive accuracy. These rate coefficients exhibited a substantial temperature-dependent increase in the rate constant (approximately 174 % at 500 K and 293 % at 2500 K). Rate of production analysis shows that the modified Lin model enhances CH 2 consumption and increases H radical formation relative to the base Lin model, while reaction flux analysis confirms that the revised R84 kinetics alter C 2 species pathways, thereby contributing to improved model prediction. The modified Lin model shows significantly improved predictions of LBVs, demonstrating good agreement with both the present measurements and previously reported literature data over a wide range of temperatures.