Parametric study of pilot–main injection strategies on the performance of a light-duty diesel engine fueled with diesel or a WCO biodiesel–diesel blend

•Main injection timing and ignition delay sensitivity increased by pilot injection.•Simultaneous decreased of PM and NOx with optimal pilot-main injection strategy.•B20 WCO biodiesel showed higher PM and lower NOx compared to diesel. Multiple injection strategies in diesel engines are known to reduc...

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Bibliographic Details
Published in:Fuel (Guildford) 2019-01, Vol.236, p.1273-1281
Main Authors: Plamondon, E., Seers, P.
Format: Article
Language:English
Subjects:
Air pollution
Biodiesel
Biodiesel fuels
Biofuels
Combustion chambers
Cooking
Cooking oils
Diesel
Diesel engines
Elastic waves
Emissions
Injection
Internal combustion engines
Light-duty diesel engine
Multiple injection
Nitrogen oxides
Optimization
Parametric statistics
Pollutant emission
Pollutants
Pollution control
Strategy
Waste Cooking Oil
Waste materials
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Summary:•Main injection timing and ignition delay sensitivity increased by pilot injection.•Simultaneous decreased of PM and NOx with optimal pilot-main injection strategy.•B20 WCO biodiesel showed higher PM and lower NOx compared to diesel. Multiple injection strategies in diesel engines are known to reduce pollutant emissions directly in the combustion chamber, while biodiesel made from waste cooking oil (WCO) has been studied mainly using single injection. In the current study, they were combined to evaluate biodiesel’s potential based on a parametric study of the injection strategy. The main findings are that pilot injection increased the sensitivity of early main-injection timing by decreasing the main-injection ignition delay. Furthermore, for some injection strategies, the pressure wave in the injector’s feed pipe also impacted the resulting pollutant emissions. Thus, the optimum double-injection strategy, allowing decreased PM and NOx emissions, was obtained with a slightly retarded main-injection timing in comparison to the optimum single-injection strategy. Waste-cooking-oil biodiesel blended with diesel (20% to 80% proportion) has, however, shown higher PM emissions and lower NOx emissions compared to diesel when a single-injection or an optimal double-injection strategy is used.
ISSN:0016-2361
1873-7153
DOI:10.1016/j.fuel.2018.09.111