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摘要
In order to reveal the spray combustion mechanism of blend fuels, a combustion model was established using EDC model based on previous experimental research. The simulation results show that under lower co-flow temperature, the auto-ignition of n-heptane (represent diesel) occurred earlier than gasoline (represent gasoline), as a result of the combined effect of slower vaporization rate and lower activation energy required for the initial dehydrogenation reaction. On the contrary, under high co-flow temperature condition, iso-octane began to ignite before n-heptane, because the chemical reaction of both n-heptane and iso-octane occurs rapidly due to the rapider vaporization so that the auto-ignition delay is most determined by the vaporization and diffusion rate of fuel. The simultaneous auto-ignition temperature "T-s" was defined in previous work to represent the co-flow temperature, at which diesel and gasoline ignited spontaneously. Further simulation research results show that, the increment of injection pressure and background pressure will increase T-s, and the impact of injection pressure on T-s is much less than that of background pressure.
- 出版日期2015-3-1
- 单位同济大学
