Effect of diesel from direct coal liquefaction–biodiesel blends on combustion, performance and emission characteristics of a turbocharged DI diesel engine

摘要: Abstract In this study, the performance and exhaust emissions of diesel engine fueled with from direct coal liquefaction (DDCL)–biodiesel blends consisting 0%, 20% 40% biodiesel are investigated. order to decrease nitric oxides (NO X ) soot emissions, retarded injection cooled gas recirculation (EGR) strategies introduced. Experiments conducted on a four-cylinder, four-stroke, injected without any modification. It is found that compared pure DDCL, DDCL–biodiesel can reduce maximum pressure rise rate gain lower combustion noise mechanical load engine. addition, there hardly difference for phase between test fuels. Both fuel consumption reduced due improved by properties biodiesel, such as cetane number oxygen. When EGR increased 40%, an increment in blends, NO , carbon monoxide (CO) equivalent brake specific (BSFC) still decreased, emission increased. Anyway, both controlled quite low level under blends.