الفهرس 
Literature ReviewOnly 14 pages are availabe for public view
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Abstract
Nowadays, internal combustion engines are the essential parts of transportation and mechanized agricultural system. So, the consumption of diesel and petroleum has been up surged. As petroleum is a non-renewable source and recent surge in petroleum prices have regenerated interest in Bio-fuels, Bio-fuels is considered as an environmentally friendly alternative diesel fuel. It has shown that biodiesel-fueled engines produce less CO, unburned HC and smoke emissions compared to diesel fuel, but higher NOx emissions. Exhaust Gas Recirculation (EGR) is an efficient technique to reduce NOx emissions as it lowers the flame temperature in the combustion chamber. The objective of this work is to reduce NOx emissions from Waste Cooking Oil (WCO) (prepared using the usual transesterification process) fueled single cylinder naturally aspirated DI Diesel engine. Experiments were performed using different mixed concentrations of biodiesel and diesel fuels, including B0, B10, B20 and B30.
The effect of a water-cooled Exhaust Gas Recirculation (EGR) rates as 0%, 10%, 20%, 25% and 30% on diesel engine performance characteristics and exhaust emission were investigated.
The results show that with increase of % EGR rates, values of CO and HC emissions increase but values of NOx and EGT emissions decrease.
Whereas 25% EGR with blend B10 (90% pure Diesel and 10% Biodiesel) exhibited reduction in both NOx emissions and BSFC by 24% and 22% respectively, 30% EGR demonstrated a reduction in NOx emission by 25% and an increase in BSFC by 12% with respect to the pure petroleum diesel.
The recommended EGR is 25% which exhibited reduction in NOx emission and improved BSFC.