Obodeh O. & Ajuwa C.I., “Evaluation of Artificial Neural Network Performance in Predicting Diesel Engine NOx Emissions”, Research Journal of Applied Sciences, Engineering and Technology, Vol. 1, No. 3, pp: 125-131, 2009.
 Ghazikhani M., Feyz V., Joharchi A., “Experimental Investigation of the Exhaust Gas Recirculation Effects on Irreversibility and Brake Specific Fuel Consumption of Indirect Injection Diesel Engines”, Applied Thermal Engineering, Vol. 30, pp: 1711-1718, 2010.
 Mohamed S.Y.E., “Effect of Exhaust Gas Recirculation on some Combustion Characteristics of Duel Fuel Engine”, Energy Conversion & Management, Vol. 44, pp: 707-721, 2003.
 Zheng M., Reader G. T., Hawley J. G., “Diesel Engine Exhaust Gas Recirculation a Review on Advanced and Novel Concepts”, Energy Conversion & Management, Vol. 45, pp: 883-900, 2004.
 Hountalas D.T., Mavropoulos G. C., Binder K. B., “Effect of Exhaust Gas Recirculation (EGR) Temperature for Various EGR Rates on Heavy Duty DI Diesel Engine Performance and Emissions”, Energy, Vol. 33, pp: 272 – 283, 2008.
Tikrit Journal of Engineering Sciences (2016) 23(1) 32- 39
Effect of Exhaust Gas Recirculation (EGR) on the Performance Characteristics of a Direct Injection Multi Cylinders Diesel Engine
|Khalil Ibrahim Abaas|
|Mechines and Equipments Eng. Dept., University of Technology, Iraq|
Owing to the energy crisis and pollution problems of today investigations have concentrated on decreasing fuel consumption and on lowering the concentration of toxic components in combustion products by using exhaust gas after treatments methods like PM filters and EGR for NOx reduction. In this study, the combustion characteristics of diesel fuel were compared with that produced from adding EGR at several percentages to air manifold. The tests were performed in a four-cylinder direct injection (DI) diesel engine at constant engine speed (1500 rpm) and variable loads (from no load to 86 kN/m2), the tests were repeated with constant load (77 kN/m2) and variable engine speeds (from 1250 to 3000 rpm). The experimental results showed that adding EGR to diesel engine provided significant reductions in brake power (bp), brake thermal efficiency and exhaust gas temperatures, while high increments in brake specific fuel consumption (bsfc). High EGR percentage (as 30% in this article) caused an 11.7% reduction in brake thermal efficiency, 26.38% reduction in exhaust gas temperatures and 12.28% in volumetric efficiency at full load conditions.
Keywords:EGR, Engine performance, Brake thermal efficiency, Brake power, Volumetric efficiency.