1982-02-01

Divided-Chamber Diesel Engine, Part I: A Cycle-Simulation Which Predicts Performance and Emissions 820273

A model has been developed for a divided-chamber automotive diesel engine which describes the intake, compression, combustion and expansion, and exhaust processes in sufficient detail to permit calculations of pressure, fuel-air ratio distribution, heat release distribution, NO formation, soot mass loading, and soot oxidation processes. The novel feature of this model is the use of a stochastic mixing approach during the combustion and expansion processes to describe the nonuniform fuel-air ratio distribution within the engine. In this approach, the fuel-air ratio distribution during the combustion and emissions formation processes can be followed as it evolves with time. Experimental data generated on a single-cylinder divided-chamber diesel engine were used to verify the accuracy of the model predictions. Agreement between experimental data and predicted values of engine performance and NOx emissions levels was good. The model is used to examine the origin of NO and soot emissions in a divided-chamber diesel engine. The cycle-simulation results show that NO forms primarily in the pre-chamber. The soot studies show that soot oxidation occurs in the pre- and main-chambers, and soot oxidation mechanism is both kinetically and mixing limited.

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