Experimental investigation of gasoline fumigation in a turbocharged IDI diesel engine

The current work examines experimentally the effects of gasoline fumigation (GF) on performance and exhaust emissions of a turbocharged indirect injection diesel engine. An elementary carburetor which main jet opening can be adjusted by a fine threaded screw was installed on the inlet pipe of the engine. Thus gasoline at desired amounts can be injected into inlet air and the engine operates mainly due to diesel principle. Results showed that effective power generally reduced and effective efficiency increased. Brake specific fuel consumption reduced and its decrement ratios are approximately at the levels of 5%. GF becomes economic for this engine and averagely 5% reduction in fuel cost was attained. NOx concentration decreased approximately at the levels of (5–10)%. Smoke index K reduced for up to (8–12)% GF and after this it began to increase. Its maximum reduction ratio was 20% for 8% GF at 2500 rpm.