Abstract
In this study, the combined effects of fuel and intake air preheating on the performance, combustion, and emission parameters of a diesel engine running on different preheated blends of fuel are studied. The preheated Palm oil methyl ester (POME) through waste heat exhaust gases is chosen as blended fuel to achieve better fuel injection characteristics. The increase in the fuel-preheated temperature shows the drop in kinematic viscosity and density values of POME. At a fuel preheating temperature of 114 °C, the viscosity and density of POME drop to 3.74 mm2/s and 871 kg/m3 which are closer to values for mineral diesel (3.35 mm2/s at 40 °C and 842 kg/m3 at 27 °C). Preheating optimized POME at inlet temperatures of 90 °C and 102 °C in a diesel engine results in the improvement of the brake specific fuel consumption, brake thermal efficiency (BTHE), and emissions (CO, HC, and CO2) with a slight increase in NOx compared to unheated POME at varying loads. In addition, preheated intake air at elevated temperature assisted further enhancement of the engine performance, combustion, and reduction of emission parameters of a diesel engine fueled with preheated blends of fuel.
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