Combined effect of combustion chamber shapes and nozzle geometry on the performance and emission characteristics of C.I. engine operated on Pongamia

The performance of the engine improved by modifying the shapes of the combustion chamber and nozzle geometry. The present work investigated the combined effect of combustion chamber shapes and nozzle geometry on performance and emission characteristics of POME biodiesel fueled diesel engine. Engine tests have been carried out on a single cylinder −4 stroke direct injection diesel engine using various blends of POME with standard diesel and comparison is made between baseline shape (HCC shape with 3 holes nozzle geometry) and modified shapes (CCC, SCC and TCC with 5 holes nozzle geometry). For comparison, the 17.5 CR, speed 1500 rpm, 205 bar IOP and IT 23° BTDC of the engine were kept constant. The experimental results showed that BTE increases up to B40 blend of POME in baseline shape and up to B20 POME blend in modified CCC shape at full load condition. A drastic reduction in UBHC and NOx emissions were observed in modified SCC and TCC shapes as compared to base line shape. CO emissions were decreased in modified CCC and baseline shapes as compared to modified SCC and TCC shapes at full load condition. CO2 emission higher in all modified shapes in diesel engine.