Simulation of Combustion Process and Pollutant Generation in a PCCI Diesel Engine with Adaptable Multiple Injection
Publication: Journal of Energy Engineering
Volume 144, Issue 5
Abstract
The combustion process in a single-cylinder turbocharged diesel engine with a pilot-pilot-main injection strategy was simulated using a computational fluid dynamics software. The effect of injection timing on the combustion process as well as the generation of NO and soot was analyzed in detail. It was revealed that the retardation of injection timing causes the pressure in the cylinder to decrease gradually. The main heat release peak also reduces while the premixed combustion fraction increases, and this causes the position of the heat release peak to move away from top dead center. At the moment of 10% heat release () with retarding the injection timing, soot generation decreases as the lean premixed combustion takes the major position while more NO is generated due to rapid heat release of the premixed mixtures. At the moment of 90% heat release (), NO emission is decreased due to the low temperature in the cylinder. Soot generation is increased initially and later decreased due to the extended combustion space and higher premixed combustion fraction. Therefore, a favorable trade-off between and PM emissions is well compromised in a diesel engine adopting a low-temperature premixed charge compression ignition (PCCI) mode.
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Acknowledgments
The authors wish to express their appreciation for the funds from the National Natural Science Foundation of China (Nos. 51506101 and 51761145011), the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD), which supported this study, and the Key Research Program of Jiangsu Province SAT (BE2016139).
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Published In
Journal of Energy Engineering
Volume 144 • Issue 5 • October 2018
Copyright
©2018 American Society of Civil Engineers.
History
Received: Dec 10, 2017
Accepted: Apr 11, 2018
Published online: Jul 6, 2018
Published in print: Oct 1, 2018
Discussion open until: Dec 6, 2018
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