Abstract

In order to meet the stringent emission standards significant efforts have been imparted to the research and development of cleaner IC engines. Diesel combustion and the formation of pollutants are directly influenced by spatial and temporal distribution of the fuel injected. The development and validation of computational fluid dynamics (CFD) models for diesel engine combustion and emissions is described. The complexity of diesel combustion requires simulations with many complex interacting sub models in order to have a success in improving the performance and to reduce the emissions. In the present study an attempt has been made to predict the multi pulse injection on a high speed DI diesel engine performance and emission characteristics. The predictions have been made for both continuous (single) and split fuel injection for 75% load of maximum torque with 1600rpm. Fluent is capable of any number of injection per cycle which has inbuilt system like common rail injection. . A 0.6mm and 0.2mm diameter orifice were used to produce injection rise rates. The Predicted results have shown very good agreement with the existing experimental results. The results have shown. Particulate matter has been significantly reduced by a factor of three compared to single injection without any increase in NOX for a long dwell between two injections

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