a mohebbi - Mechanical Engineering Department, University of Urmia, Iran
s jafarmadar - Mechanical Engineering Department, University of Urmia, Iran
j pashae - Engineering Research Department of Motorsazan Company, Tabriz, Iran
m Shirnezhad - Mechanical Engineering Department, University of Urmia, Iran

This paper presents the results of experimental work carried out to evaluate the distribution of cold and hot exhaust gas recirculation between cylinders in a DI diesel engine. The experiments have beenconducted on a 3.99 liters turbocharged DI diesel engine under full load condition at 1900rpm in orderto distinguish and quantify some effects of hot and cooled EGR with various rates on the EGR distribution and engine parameters. Experimental results showed that with increasing of EGR rate, unequal EGR distribution was increased in inlet port of cylinders while the reducing of EGRtemperature (cooled EGR) improved this distribution and decreased the EGR cylinder-to-cylinder variations. The results show that performance and emissions can be improved at cooled EGR due to equal EGR distribution, especially at high rates

Diesel Engine,Exhaust Gas Recirculation,EGR Distribution,EGR Temperature,Combustion,Emissions