Abstract
Diesel is the most efficient combustion engine today, and it plays an important role in the transport of goods and passengers on-road and on high seas. It is expected that the diesel engine will be active for another 100 years as increasingly economical sources are found with the increase in oil prices offering an incentive to the explorers. The emissions must be controlled as demanded by society without sacrificing the legendary fuel economy of 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 (NOx). From 16 g/kWh in 1988, the limit on NOx is reduced today to as low as 0.4, and the PM limit is reduced from 0.8 g/kWh to 0.01. These limits are being continually reduced. Therefore, the required accuracy of the models to predict PM, NOx, and efficiency of the engines is high. The phenomenological combustion models 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 with the phenomenological approach, has the dominant effect on mixture formation and subsequent course of combustion. The need for improving these models was also established by incorporating developments happening in engine designs. A phenomenological model consisting of sub-models for combustion and emissions is proposed in detail in this chapter. With more and more “model-based control programs” used in the ECU controlling the engines, phenomenological models are assuming importance now. The full CFD-based models though give detailed insight into the combustion phenomena and guide the design engineer, they are too slow to be handled by the ECU’s or for laying out the engine design. Therefore, phenomenological models have a bright future hand in hand with sophisticated models. The diesel combustion is modelled by studying the structure of the spray, ignition delay, heat transfer, air–fuel mixing, and heat release. These contribute to smoke, NOx, and engine performance.
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Lakshminarayanan, P.A., Aghav, Y.V. (2022). Phenomenology of Diesel Combustion and Modelling. In: Modelling Diesel Combustion. Mechanical Engineering Series. Springer, Singapore. https://doi.org/10.1007/978-981-16-6742-8_2
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