Phenomenology of Diesel Combustion and Modeling Diesel is the most
efficient combustion engine today and it plays an important role in
transport of goods and passengers on land and on high seas. The
emissions must be controlled as stipulated by the society without
sacrificing the legendary fuel economy of the diesel engines. These
important drivers caused innovations in diesel engineering like
re-entrant combustion chambers in the piston, lower swirl support
and high pressure injection, in turn reducing the ignition delay
and hence the nitric oxides. The limits on emissions are being
continually reduced. The- fore, the required accuracy of the models
to predict the emissions and efficiency of the engines is high. The
phenomenological combustion models based on physical and chemical
description of the processes in the engine are practical to
describe diesel engine combustion and to carry out parametric
studies. This is because the injection process, which can be
relatively well predicted, has the dominant effect on mixture
formation and subsequent course of combustion. The need for
improving these models by incorporating new developments in engine
designs is explained in Chapter 2. With "model based control
programs" used in the Electronic Control Units of the engines,
phenomenological models are assuming more importance now because
the detailed CFD based models are too slow to be handled by the
Electronic Control Units. Experimental work is necessary to develop
the basic understanding of the pr- esses.
General
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