CFD Analysis of DI Diesel Engine using Exhaust Gas Recirculation

Abstract

Abstract: NOx is produced by a diesel engine due to high
temperatures available in the combustion chamber. Nitrogen is
in diatomic nature in the air, but at high temperatures
available in the combustion chamber, it will divide into
monatomic form and this monatomic nitrogen reacts with
Oxygen to form NOx. To reduce this NOx formation in the
diesel engine oxygen content is to be reduced in the intake air.
It will be achieved by re-circulating some amount of exhaust
gas into the combustion chamber through intake air.
This present work discusses the piston bowl design and
control of nitric oxides by using exhaust gas recirculation in
direct injection diesel engine. Hemispherical piston bowl of the
direct injection diesel engine is created with the help of PRO-E
software. This piston is used in CFD for analysis of emissions
reduction by the method of Exhaust gas recirculation at
different percentages. It is proposed to analyze this in CFD by
using STAR-CD as a tool.
The results, which are obtained from the CFD are compared
with Experimental results which are available in the literature.
Index Terms: Hemispherical piston bowl, PRO-E, Direct
injection diesel engine, piston bowl, Exhaust gas recirculation,
CFD, NOx emissions, CO Emissions.