COMBUSTION AND EMISSION CHARACTERISTICS OF A DIESEL ENGINE WORKING WITH DIESEL/JOJOBA BIODIESEL/HIGHER ALCOHOL BLENDS

摘要

The main concerns of utilizing jojoba biodiesel in CI engines is that it has a high viscosity and high NO_x formation. Therefore, this article purposes in endeavoring to improve the combustion and emission parameters of a CI engine working with diesel/jojoba biodiesel blend and higher alcohols under various engine loads. The higher alcohols typically are n-butanol, n-heptanol, and n-octanol, which are combined with 50% diesel, 40 % of jojoba biodiesel at a volume portion of 10%, and they are designated as DJB, DJH, and DJO respectively. The jojoba biodiesel is manufactured via a transesterification process with facilitating mechanical dispersion. The findings display that there is a drop in p_(max). and HRR for DJB, DJH, and DJO blends compared to pure diesel fuel, whereas the combustion duration and ignition delay are extended. The brake specific fuel consumption is enlarged. Concerning engine emissions, the NO_x formation is reduced while the CO, UHC, and soot emissions are increased for DJB, DJH, and DJO mixtures. It can be deduced that combining high fractions of jojoba biodiesel with C_4, C_7, and C_8 alcohols have the feasible to accomplish low NO_x formation in the interim having high thermal efficiency level.