The application of EGR on compression ignition
(CI) engine has a number of effects on the combustion
process and emissions. Firstly, preheating effect in this
process the inlet charge temperature increased when the
hot EGR mixed with air/fuel mixture. Secondly,
dilution effect due to the introduction of EGR leads to a
considerable reduction of the oxygen concentration.
Thirdly, heat capacity effect in this process affects the
total heat capacity of the mixture of EGR, air and fuel
will be capacity owing to the higher heat capacity of
carbon dioxide and water vapor. This will lead to a
reduction of the gas temperature at the end of the
compression stroke. Fourthly, as chemical composition
of the intake mixture changes, the combustion
characteristics of the charge become different from the
non-EGR condition. In this work, experiments have
been carried out in a double cylinder, water cooled, four
stroke, direct injection diesel engine with exhaust gas
recirculation technique (EGR) using diesel blended
with jatropha biodiesel at different ratios as fuels and
the performance characteristics of the engine have been
studied.