Abstract:
The effects of fuel injection conditions such as the start of injection, duration of injection, split injection in a diesel engine on the soot and NOx emissions are studied by using the KIVA-3V code. The results show the general trends of soot and NOx emissions. When the start of single injection is advanced or split injection is applied, the combustion chamber temperature is increased due to the prolongation of combustion process, consequently the soot concentration is decreased. In the other hand this phenomena caused the increasing of NOx emissions.Keywords:
Secondary air injection
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The soot inception process inside a diesel engine was studied by the analytical models. With the general chemical reaction mechanism for the soot formation, the phase equilibrium concept is considered for the inception process of soot. In the phase equilibrium concept, the soot is formed from the phase change of gaseous carbon atoms as the phase change of gaseous precursors into solid soot under the condition of saturation pressure. These soot models are implemented into the KIVA-3V code. The results from the phase equilibrium model show that the cold fuel-rich core of spray is the main source of soot inception rather than the high temperature flame. The modified soot model showed reasonable results comparing with the experimental results and similar soot distribution inside a cylinder to the other experimental observations.
Carbon fibers
Saturation (graph theory)
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