Characterization of diesel engine with palm oil at different compression ratio

Abstract

The performance, emission and combustion characteristics of a single cylinder four stroke direct injection air cooling various compression ratio multi fuel engine when fueled with palm oil methyl ester and its 2%, 5%, 7% and 10% blends with diesel (on a volume basis) are investigated and compared with standard diesel. The experiments were conducted at a fixed engine speed of 3000 rpm at different loading conditions and at compression ratios of 16:1, 18:1, and 20:1and 22:1. The impact of compression ratio on fuel consumption, brake thermal efficiency and air fuel ratio was investigated and presented. The optimum compression ratio which gives the best performance was identified. Comparisons between compression ratio with diesel and the biodiesel blends on the brake specific fuel consumption (BSFC), brake thermal efficiency (th) , carbon monoxide (CO), carbon dioxide (CO2), nitrogen oxide (NOx) and exhaust smoke were carried out in this study for every value of CR. In the engine experiment, it was found that the palm oil methyl ester functions better with VCR than fixed CR in terms of performance (SFC and th) where the SFC decreases by 5.4%, �th increases by 3.7% at CR 22 with B2, the Smoke quality and CO showed a decrease by 22% and 29% at CR 22 with B2 while the NOx decreases by 30% at CR 16 than CR20 and diesel.