Simultaneous reduction of nitric oxide and smoke emissions in a jatropha biodiesel fuelled CI engine with water emulsion

Abstract

Aiming towards mitigating the pervasive effect of the fossil fuel and its environmental pollution crisis, the present work aims to decrease nitric oxide and smoke emissions simultaneously using water emulsion in a jatropha oil methyl ester (JOME) fuelled compression ignition (CI) engine. Biodiesel derived from biomass is the viable alternate fuel due to its availability and renewable nature. JOME is derived from jatropha oil through tranesterification process and emulsified with water in the ratio of 5%, 10% and 15%. Tests were carried out in a one cylinder, liquid cooled, direct injection (DI) engine delivering 5.2 kW at full load. Results indicate a significant reduction in NO and smoke release with water emulsion at all loads. With JOME85+W15, NO emission decreases by 21.1% and 23.9% compred to diesel and JOME respectively at maximum load. with JOME85+W15, smoke emission decreases by 15.8% and 5.5% compred to diesel and JOME respectively at maximum load. However increasing the quantity of water in the emulsion decreases the brake thermal efficiency (BTE), in-cylinder pressure and net heat release rate (NHR).