TITLE:
Investigating Diesel Engine Performance and Emissions Using CFD
AUTHORS:
Tarek M. Belal, El Sayed M. Marzouk, Mohsen M. Osman
KEYWORDS:
Numerical Simulation; Unsteady Flow; Combustion; Diesel Engine
JOURNAL NAME:
Energy and Power Engineering,
Vol.5 No.2,
March
29,
2013
ABSTRACT:
Fluid flow in an internal combustion engine presents one of the most
challenging fluid dynamics problems to model. This is because the flow is associated
with large density variations. So, a detailed understanding of the flow and combustion
processes is required to improve performance and reduce emissions without compromising
fuel economy. The simulation carried out in the present work to model DI diesel
engine with bowl in piston for better understanding of the in cylinder gas motion
with details of the combustion process that are essential in evaluating the effects
of ingesting synthetic atmosphere on engine performance. This is needed for the
course of developing a non-air recycle diesel with exhaust management system [1].
A simulation was carried out using computational fluid dynamics (CFD) code FLU- ENT. The
turbulence and combustion processes are modeled with sufficient generality to include
spray formation, delay period, chemical kinetics and on set of ignition. Results
from the simulation compared well with that of experimental results. The model proved
invaluable in obtaining details of the in cylinder flow patterns, combustion process
and combustion species during the engine cycle. The results show that the model
over predicting the maximum pressure peak by 6%, (p-θ), (p-v) diagrams for different engine loads
are predicted. Also the study shows other engine parameters captured by the simulation
such as engine emissions, fuel mass fraction, indicated gross work, ignition delay
period and heat release rate.