Double Exhaust Gas Recirculation(EGR) System

Abstract

In internal combustion engine,the temperature of the engine increases because of the repetitive combustion processes inside the combustion chamber and due to Nitrogen atoms react with Oxygen atoms to form Nitrogen Oxides (NOx), which have a negative effect on plants, human and on Ozone layer especially when Nitrogen Oxides react with Sulfur Oxides to form acid rain, so the cars company made a technique to decrease NOxby Exhaust Gas Recirculation (EGR). EGR system works by taking a quantityof exhaustgases ( 15-30 % by mass flow rate) percentand then entered again into the combustion chamber in order to reduce the temperature of engine and reduce the quantity of NOx. In the present study a secondary EGR will be connected in parallel with the primary EGR to form Double EGR system in order to reduce the quantity of NOx compared with traditional system. The flow rate of the secondary EGR will be controlled separately. Experimental study will be conducted to compare the NOx and fuel consumption of the Double EGR system. In addition a special device will be used to generate turbulence in the secondary EGR to study the corresponding effect on NOx.