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Investigation and modelling the effect of injection pressure on heat release   parameters and engine-out nitrogen oxides are the main aim of this study. A   zero-dimensional and multi-zone cylinder model was developed for estimation   of the effect of injection pressure rise on performance parameters of diesel   engine. Double-Wiebe rate of heat release global model was used to describe   fuel combustion. extended Zeldovich mechanism and partial equilibrium   approach were used for modelling the formation of nitrogen oxides. Single   cylinder, high pressure direct injection, electronically controlled,   research engine bench was used for model calibration. 1000 and 1200 bars of   fuel injection pressure were investigated while injection advance, injected   fuel quantity and engine speed kept constant. The ignition delay of injected   fuel reduced 0.4 crank angle with 1200 bars of injection pressure and   similar effect observed in premixed combustion phase duration which reduced   0.2 crank angle. Rate of heat release of premixed combustion phase increased   1.75 % with 1200 bar injection pressure. Multi-zone cylinder model showed   good agreement with experimental in-cylinder pressure data. Also it was seen   that the NOx formation model greatly predicted the engine-out NOx emissions   for both of the operation modes

Modelling the effect of injection pressure on heat release parameters and nitrogen oxides in direct injection diesel engines