Performance Emission and Combustion Analysis of Low Temperature Combustion Using Biodiesel on C I Engine

Abstract

The present investigation is carried to analyse the performance emissions and combustion studies of CRDI engine fuelled with 10%, 20% and 30% of Jatropha curcas fuel blend along with the application of 10%, 20% and 30% EGR rates for zero, 25%, 50%, 75% and 100% load conditions. All above test conditions were carried out for three different fuel injection timings (10° CA, 14° CA and 18°CA BTDC) and fuel injection pressure (FIP) of 600,800 and 1000 bar with single injection mode. The parameters like brake thermal efficiency (BTE), brake specific energy consumption (BSEC), emission characteristics such as smoke opacity, oxides of nitrogen (NOx), Hydrocarbon (HC) and carbon mono-oxide (CO) and combustion characteristics like pressure vs crank angle, net heat release rate (NHRR) were measured and analysed. The results shows improvement in BTE with the combined effect of biodiesel blends along with EGR and also decrease of smoke opacity, HC and CO, NOx emissions for 1000 bar FIP at 18°CA BTDC. In summary, it is optimized that engine running with biodiesel blend JB20 with 15% EGR rate culminates into NOx reductions without affecting engine efficiency and other emissions like smoke opacity, hydrocarbon and carbon mono-oxide for single injection mode. Experimental analysis has been continued with multiple injection modes for conventional as well under LTC mode for optimized values at JB20 blend for 1000 bar FIP with 15% EGR rate at 75% load, as obtained from single injection mode. To ensure better thermal efficiency and stable operation of the engine, the pilot injection timings of 20°CA, 30°CA and 40°CA BTDC was chosen with 10°CA BTDC as main injection timing for 5%, 10% and 15% pilot quantity. From analysis it was found that simultaneous reduction of NOx and smoke emissions can be achieved using the combination of pilot injection timing and pilot quantity with improvement in BTE.