Abstract
Postcombustion oxidation plays a significant role in reducing engine-out hydrocarbon emission levels and is a complicated process depending on in-cylinder temperatures, stoichiometries, and flows. A research program addressing the role of chemical kinetics, fluid mechanics, and engine operating conditions and their relative importance in the process of postocombustion hydrocarbon oxidation has been conducted. Initially, the role of mixing and kinetics on in-cylinder postcombustion hydrocarbon oxidation was examined using gaseous hydrocarbons with carbon number less than six. Cycle-averaged exhaust manifold sampling results showed that fuel structure plays a significant role in determining emissions levels, and time-resolved exhaust port sampling data indicated that the extent of hydrocarbon oxidation is highest during the expansion process and decreases significantly during the exhaust process. Subsequently, an exhaust port tracer technology was developed and applied to investigate the importance of port temperature, kinetics, and mixing in the exhaust port oxidation processes. Minimum exhaust port temperatures for hydrocarbon oxidation range between 1300 and 1500 K.
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