Diesel combustion in heavy-duty engine with single- and double-injection strategies

Split injection strategies are attractive combustion strategies due to their potential in satisfying strict emission standards. In this study, a multidimensional computational fluid dynamics simulation was used to validate the numerical results for single- and double-injection strategies with experimental data. Thereafter, simultaneous effects of converting a single-injection strategy to a double-injection strategy and retarding the injection timing on the combustion parameters, pollutant emission, performance, and exergy terms were investigated. Results showed that double-injection strategies and retarding the start of injection could significantly affect the performance and engineout emissions, which could reduce the pollutant emission with a slight decrease in engine performance. Furthermore, results of exergy study confirm that double-injection strategies have a better exergy efficiency due to its lower irreversibility than the single-injection strategy.