Assessment of the Performance and Exhaust Emission of A Diesel Engine Using Water Emulsion Fuel (Wef) in Different Engine Speed and Load Conditions

The performance characteristics and exhaust emission of a diesel engine using water emulsion fuel (wef) have been investigated under different engine speeds (1600 to 2400 rpm) and load conditions (25 to 100 %). the experiments were carried out on an air-cooled diesel engine of single cylinder using the wef containing 5 % water, 2 % surfactant with hydrophilic-lipophilic balance (hlb) of 6.8. the engine performance and exhaust emission using wef were also compared with the neat diesel fuel (ndf). according to the results, average reduction of 9.7 % in the engine torque and brake power was observed using wef at all engine speeds. in addition, a 7.9 % increase in the brake specific fuel consumption (bsfc) and a 3.7 % increase in the brake thermal efficiency (bte) were observed for wef in comparison with ndf in all loading conditions. in case of emission, significant lower hydrocarbon emission (i.e., 14.6 % on average) was observed for wef comparing to ndf at all engine speeds. moreover, a considerable reduction in the nox emission (i.e., 31.1 % on average) was observed for the wef comparing to the ndf in every engine load. in summary, the application of wef leads to the reduction in the emission of different pollutants with a positive impact on the environment.