Effects of compression ratio on performance and emissions of a modified diesel engine fueled by HCNG

摘要

In this study, the effects of compression ratio (CR) have been investigated engine performance and emissions characteristics of a modified diesel engine fueled by HCNG (hydrogen enriched compression natural gas) blends (100% CNG, 95% CNG +5% H-2, 90% CNG + 10% H-2 and 80% CNG + 20% H-2). The experiments have been carried out using a modified Isuzu 3.9 L diesel engine having 9.6, 12.5 and 15 different compression ratios at 1500 rpm under full load conditions. Engine brake torque, brake specific fuel consumption, combustion analysis and emissions parameters (CO, THC and NOX) have been realized at 10 CA BTDC ignition timing and different excess air ratios (lambda = 0.9-1.3).