Characteristics and Kinetic Analysis of Ignition for Different Gasoline Surrogate Fuel Models

Based on the experimental and the calculated results, the differences and similarities of ignition characteristics for different gasoline surrogate fuels have been investigated in this paper. The results show that the low-temperature ignition characteristics of different surrogate models present difference, while the high-temperature ignition characteristics show similarity. Kinetic analysis found that for different surrogate models, the low-T ignition processes are all dominated by the primary dehydrogenation and oxidation reactions of paraffins. Therefore, the initial concentration of the paraffin in surrogate model is critical to the ignition process and is the root cause of the low-T ignition differences. While at high-T, the ignition processes are all controlled by the small molecular reactions related to OH radical, and OH radical features are basically the same, so ignitions generally show similarity. Meanwhile, ethanol and 2,4,4-trimethyl-1-pentene (DIB) can promote the high-T ignition processes, and its content determines the slight difference of high-T ignition. The work of this paper deepens the understanding of the chemical reaction mechanism and also provides the improvement scheme for the optimization and creation of the mechanism of the surrogate fuels.