Abstract
ABSTRACT This work presents the results of an investigation on the effects of exhaust gas recirculation (EGR) on performance and emissions at high fuel injection pressure in Common Rail Direct Injection (CRDI) engine. Cottonseed biodiesel is mixed with diesel in two different proportions, i.e., 10 and 15% by volume, designated as B10 and B15. The experimentation was conducted with the said fuel blends under different EGR rates such as 15, 20 and 25%, at a fuel injection pressure (FIP) of 900 bar and at a constant engine speed of 1500 rpm. It was found that at15% EGR, brake thermal efficiency (BTE) reduced by 7.89% at 60% load and 11.9% at full load condition while at EGR 25%, BTE reduced 15.2% and 18.9% with B10 and B15 respectively. The rise in brake specific fuel consumption (BSFC) was 11.1% and 14.8% for B10 and B25 respectively. At 25% EGR, CO rises by 23.3% with B10 and 22% with B25 while HC rises by 4.7% for B10 and 3.5% for B25. At 25%EGR, NOx reduced by 33% when compared to diesel fuel.
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