Numerical simulation of the effect of multiple injection strategy on the combustion of a high-pressure common-rail diesel engine
To reduce diesel engine emissions and meet increasingly stringent emission regulations,GT-SUITE software series was used to establish a high-pressure common rail injection system simulation model and a six-cylinder diesel engine whole engine model separately for a locomotive diesel engine,and to couple the two.Experimental data and simulation data were compared to verify the accuracy of the models.The simulation calculated and analyzed the effects of pilot injection quantity and pilot-main injection interval angle on the performance of the high-pressure common rail diesel engine.The results indicated that when considering the effect of the pilot-main injection interval angle,setting a constant pilot injection quantity of 5%and combining it with a 5° pilot-main injection interval angle could reduce NOX emissions at rated,intermediate,and idling conditions by 16.4%,17.4%,and 29.2%respectively without deteriorating fuel consumption rate and SOOT(Carbon SOOT)emissions.When considering the effect of pilot injection quantity,setting the pilot-main injection interval angle to 10° constant,NOX emissions at rated,intermediate,and idling conditions were significantly lower than the original engine,and compared to the combination with a 5%pilot injection quantity,NOX emissions could be reduced by up to 42.7%.Considering the impact on fuel economy and SOOT emissions,a combination of 10%pilot injection quantity could achieve better results.
high-pressure common rail diesel enginepre-injection strategynumerical simulationGT-SUITE
NETL
NSTL
万方数据
