Effect on higher compression ratio on unmodified CI engine powered by biodiesel blend

Abstract

In order to keep up with the ever-increasing need for energy, the use of fossil fuels has no choice but to keep rising in tandem with the world's population, which is rapidly industrialising, urbanising, and expanding economically. Finding a suitable and environmentally friendly alternative to fossil fuels will become necessary if emissions from the use of fossil fuels continue unabated. Because of its renewable, non-toxic, and environmentally friendly character, biodiesel is an appropriate alternative solution that may be used in diesel engines. In the current investigation, the compression ratio of CI (Compression Ignition) engines was varied from 17 to 20 in an effort to find the optimum combination of performance, combustion, and emission characteristics for IC engines. When compared to the same blend at CR (Compression Ratio) 18, the BTE (Brake Thermal Efficiency) levels of KME20 (Kapok Methyl ester 20) at CR 19 were 5.6% higher. When compared to greater CR, the KME20 blend's emission values for both UBHC (Unburnt Hydro Carbons) and CO (Carbon monoxide) are higher than their respective values. When the compression ratio was reduced to 19, the emissions from the blend KME20 were 9.1% and 9.6% lower than when the same fuel was used at the standard compression ratio. It's possible that this is because the oxidation process of the hydrocarbons is more efficient, in addition to the fact that the temperature in the cylinder is high enough to promote full combustion.