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- W2947947576 abstract "Oxygen enrichment combustion is one of the attractive methods to improve combustion and reduce emissions in spark ignition engines. The effects of intake oxygen enrichment on intermediate radicals, combustion, and unregulated emissions of formaldehyde and unburned methanol during cold start were numerically calculated by using CFD simulation coupled with a detailed methanol chemical kinetic model for a DISI methanol engine. Results show that the concentration of OH, O, and H radicals during cold start is obviously increased and CA50 is slightly advanced with increase of intake oxygen concentration (CO2), resulting in accelerated chain reaction in methanol combustion, and further mitigating unburned methanol emissions. When CO2 varies from 21% to 36%, cylinder temperature increases due to the post-combustion. Cylinder temperature reaches the maximum value at 36% CO2. After further increasing CO2 to 41%, the in-cylinder temperature start to decrease as a result of the decreased OH concentration and inhibited post-combustion. In general, CO2 is the accelerant in formaldehyde formation at initial stage and in formaldehyde oxidization during post-combustion. By increasing CO2, formaldehyde emission rises and unburned methanol emission diminishes during cold start." @default.
- W2947947576 created "2019-06-07" @default.
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- W2947947576 date "2019-10-01" @default.
- W2947947576 modified "2023-10-13" @default.
- W2947947576 title "Numerical investigation of intake oxygen enrichment effects on radicals, combustion and unregulated emissions during cold start in a DISI methanol engine" @default.
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- W2947947576 doi "https://doi.org/10.1016/j.fuel.2019.05.140" @default.
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