Effects of Injection Parameters on the Combustion and Emission Characteristics of Diesel-Piloted Direct-Injection Natural Gas Engine during Idle Conditions
Publication: Journal of Energy Engineering
Volume 141, Issue 4
Abstract
The purpose of this paper is to investigate the effects of injection parameters on combustion and emission characteristics of a six-cylinder diesel-piloted direct-injection natural gas engine at idle conditions. The tests were conducted at three injection pressures (15, 18, and 24 MPa), two different injection intervals (0.7 and 1.0 ms), and start of natural gas injection in the range of 4–13° before top dead center (BTDC). The experimental results revealed that in terms of cylinder pressure and heat release rate, the maximum cylinder pressure and the maximum heat release rate were substantially higher at the injection pressure of 24 MPa and increased gradually with advanced injection timing, while only slightly influenced by injection interval. In terms of combustion parameters, the ignition delay was reduced by adoption of higher injection pressure and the rapid combustion duration was extended more evidently with the advance of injection timing. In terms of emissions, application of relatively lower injection pressure of 15 and 18 MPa had benefits in reduction of CO, HC, and emissions; CO emissions were higher with advanced injection timing and could be improved with shorter injection interval at the injection pressure of 15 and 18 MPa, while emissions exhibited the same trend for all injection pressures.
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Acknowledgments
The writers acknowledge financial support from Ministry of Industry and Information Technology of the People’s Republic of China (2060303), and assistance from Weichai Westport Inc. in conducting the experiments.
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Information & Authors
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Published In
Journal of Energy Engineering
Volume 141 • Issue 4 • December 2015
Copyright
© 2014 American Society of Civil Engineers.
History
Received: Jun 24, 2014
Accepted: Aug 13, 2014
Published online: Sep 11, 2014
Discussion open until: Feb 11, 2015
Published in print: Dec 1, 2015
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