| Summary: | 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.
|
|---|
