, University of Tabriz
Mechanical Engineering, University of Tabriz
This paper reports the results of an experimental investigation on the effect of the EGR on the pollutants emission, especially on oxides of nitrogen, from the exhaust gases and performance of the spark ignition engine. Also along with experimental work, a mathematical model for the determination of the effect of EGR on the peak cycle temperature and for the prediction of its effect on the NOx emission is constructed. The results of theoretical calculation show how peak temperature of theoretical cycle decreased with increasing of the recycling gas percentage. Tests were conducted on a four stroke petrol engine used in passenger cars. The experimental investigations show that NOx emission decreases with increasing of the percentage of the recycling gas. At 9% recycling, 73% of NOx emissions decreased at EGR valve opening 360 degrees. Brake specific fuel consumption and brake power are changed negligibly.