Numerical and Experimental Study on the Impact of Mild Cold Exhaust Gas Recirculation on Exhaust Emissions in a Biodiesel-Fueled Diesel Engine

Abstract This work evaluated the effect of cooled exhaust gas recirculation (EGR) on fuel consumption and pollutant emissions from a diesel engine fueled with B8 (a blend biodiesel no. 8:92% by volume), experimentally numerically. Experiments were carried out power generator varying loads 5 kW to 35 10% cold EGR ratio. Exhaust (e.g., total hydrocarbons (THCs), nitrogen oxides (NOx), carbon monoxide (CO), etc.) measured evaluated. The results showed mild low content have minor impact engine-specific consumption, conversion efficiency, in-cylinder pressure. Meanwhile, combination reduced THC NOx up 52% 59%, which shows promising overcoming particulate matter–NOx tradeoff engine. A three-dimensional computational fluid dynamics model incorporated detailed combustion kinetics formation was validated against pressure, temperature, engine-out nitric oxide emission valid then employed investigate temperature equivalence ratio distribution that predominate formation. critical reduction is obtained little local and, mainly, creating comparatively rich combusting mixture, makes path pass through lower zone in ϕ–T diagram.