Experimental investigation on the effect of gaseous fuels energy share on reactivity controlled compression ignition mode of combustion operated with gaseous fuels and liquid fuels

Abstract

The effect of gaseous fuels energy share (GFES) on reactivity controlled compression ignition (RCCI) mode of combustion operated with gaseous fuels and liquid fuels have been studied in this research work. Pure diesel, Thevetia Peruviana methyl ester (TPME) B20 and B100 fuels are used as high reactive fuels (HRFs) and these fuels injected directly during compression stroke while compressed natural gas (CNG) and compressed biogas (CBG) fuels are utilized as low reactive fuels (LRFs) and these fuels are injected during suction stroke with the help of electronic control unit (ECU). Experimental tests are carried-out on RCCI engine with 50% of rated power. The CNG and CBG fuels are varied in the form of GFES from 10% to 80%. From test results it is found that, brake thermal efficiency (BTE) of RCCI engine increased up to 40% GFES. The engine-out hydrocarbon (HC) and carbon monoxide (CO) emissions of CBG at all GFES are more as related to CNG. The engine-out nitric oxide (NOx) emissions of RCCI engine fueled with CNG at all GFES are higher as related to CBG.