Low temperature combustion has proved to be beneficial for low NOx and particulate material emissions. Renewable fuels, such as biodiesel, alcohol fuels, and ether fuels can further decrease the carbon footprint of the engine. The NO to NO2 ratio in engine out NOx emissions has shown dependency on the concentration of hydrocarbon&nbsp;emissions. ﻿This relationship has a significant impact on the design of exhaust after-treatment systems. However, the effect of the HC species on NO to NO2 conversion process is less understood. This paper investigates the impact of DME and propane on the in-cylinder conversation of NO to NO2 in a compression ignition engine. Firing test under low temperature combustion condition was first performed to demonstrate the impact of intake HC concentration on exhaust NO concentration and composition.&nbsp; Then, motoring tests are performed with a mixture of the HC and NO dosed into the engine intake manifold. The simplified testing scenario makes it easier to understand the reaction mechanism between HC and NO. The compression tests assist the mechanism study, simplifying the process of understanding the difference in fuel behaviour which is further investigated through a reaction pathway study of the NO to NO2 conversion using a stochastic reactor model with detailed chemical kinetics. This study aims to describe the impact of the two fuels in the NO to NO2 conversion process and the boundary conditions at which these differences occur.

Hydrocarbon Species Impact on NO to NO2 Conversion in a Compression Ignition Engine Under Low Temperature Combustion Conditions

Paper Proceedings: https://asmedigitalcollection.asme.org/ICEF/ICEF2021/volume/85512

ASME 2021 Internal Combustion Engine Division Fall Technical Conference (ICEF2021)

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