Investigation on combustion and emission characteristics of diesel and gasoline blends with exhaust gas recirculation.

Blending gasoline in diesel may decrease the viscosity and decrease the distillation temperature and thus improve the spray and air-fuel mixture quality. Diesel (D100), 80% diesel and 20% gasoline by vol. (D80G20), and 60% diesel and 40% gasoline by vol. (D60G40) were experimentally investigated. The ignition delay prolongs, the combustion duration shortens and the peak combustion temperature increase with gasoline. The number concentrations (NCs) of ultrafine particles (UFPs) decrease and the NOx emissions increase with gasoline. The NCs of UFPs increase and the NOx emissions decrease with exhaust gas recirculation (EGR). The NCs of UFPs and the NOX emissions of D60G40 can be simultaneously reduced with 20% EGR compared to D100 without EGR. [ABSTRACT FROM AUTHOR]