Thermal Science 2013 Volume 17, Issue 1, Pages: 11-23
https://doi.org/10.2298/TSCI111218108B
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Computational fluid dynamics simulation of the combustion process, emission formation and the flow field in an in-direct injection diesel engine
Barzegar Ramin (Young Researchers Club, Parsabad Mogan Branch, Islamic Azad University, Parsabad, Iran)
Shafee Sina (Faculty of Natural and Applied Sciences, Mechanical Engineering Department, Middle East Technical University, Ankara, Turkey)
Khalilarya Shahram (Mechanical Engineering Department, Urmia University, Urmia, Iran)
In the present paper, the combustion process and emission formation in the
Lister 8.1 I.D.I Diesel engine have been investigated using a Computational
Fluid Dynamics (CFD) code. The utilized model includes detailed spray
atomization, mixture formation and distribution model which enable modeling
the combustion process in spray/wall and spray/swirl interactions along with
flow configurations. The analysis considers both part load and full load
states. The global properties are presented separately resolved for the swirl
chamber (pre-chamber) and the main chamber. The results of model verify the
fact that the equal amount of the fuel is burned in the main and pre-chamber
at full load state while at part load the majority of the fuel is burned in
the main chamber. Also, it is shown that the adherence of fuel spray on the
pre-chamber walls is due to formation of a stagnation zone which prevents
quick spray evaporation and plays an important role in the increase of soot
mass fractions at this zone at full load conditions. The simulation results,
such as the mean in-cylinder pressure, heat release rate and exhaust
emissions are compared with the experimental data and show good agreement.
This work also demonstrates the usefulness of multidimensional modeling for
complex chamber geometries, such as in I.D.I Diesel engines, to gain more
insight into the flow field, combustion process and emission formation.
Keywords: I.D.I Diesel engine, CFD, flow field, combustion, NOx, soot