ABSTRACT

Exhaust gas recirculation (EGR) is effective to reduce nitrogen oxides (NOx) from diesel engines because it lowers the flame temperature and the oxygen concentration of the working fluid in the combustion chamber,however ,as NOx reduces particulate matter (PM) increases resulting from the lowered oxygen concentration.when EGR futher increases, the engine operation reaches zones with higher instabilities, increased carbonaceous emissions and even power losses. in this research an attempt is made to reduce smoke and NOx emissions with the combined effect of turbulence inducement using internal jet piston and exhustgas recirculation (EGR) the internal jet piston which create the turbulence in the combustion chamber which enhance the complete combudtion but increased NOx emissions.the NOx emissions are reduce with exhustgas recirculation.

KEYWORDS: INTERNAL JET PISTON,EXHAUST GAS RECICULATION,EMISSIONS,PALM OIL METHYL ESTER,TURBULENCE.