Impact of secondary fuel injector in various distance on direct injection diesel engine using acetylene-bio diesel in reactivity controlled compression ignition mode

Abstract

ABSTRACT Many researchers utilized acetylene fuel in conventional diesel engine in dual fuel mode. Dual fuel Reactivity Controlled Compression Ignition (RCCI) engine is established by modifying the Conventional Diesel Engine (CDE) intake manifold that supplies secondary fuel through the injector. The aim of the study is to analyze the acetylene-bio diesel fueled RCCI engine by varying the secondary fuel injector position in the intake manifold. The experiment was carried out by acetylene gas as a Low Reactivity Fuel (LRF) which is supplied by an injector at a distance of 243.5 mm, 288.5 mm, and 333.5 mm from the intake valve with a constant flow rate of 4 l/min during the suction stroke. The High Reactivity Fuel (HRF) B20 MOME (Mahua Oil Methyl Ester) is supplied through the injector at end of the compression stroke. The modified engine was tested for its performance, combustion, and emission characteristics. The result shows that the Brake Thermal Efficiency (BTE) at a distance of 243.5 mm from the intake valve increases all loads and achieves a brake thermal efficiency improvement of 2.27% from the B20 MOME fueled engine. The Exhaust Gas Temperature (EGT) and NOx, which are predominantly higher in biodiesel fueled engine, are reduced about 13.5% and 13.6% respectively at a distance of 243.5 mm from the intake valve in the RCCI mode combustion.