Temperature, Combustion, and Emissions on a Diesel Engine Using N-Butanol/Diesel Compound Combustion Mode
Publication: Journal of Energy Engineering
Volume 144, Issue 2
Abstract
By adding an injection system of n-butanol on the intake manifold, the four-cylinder direct injection (DI) diesel engine had been modified to operate in n-butanol/diesel compound combustion mode (BDCC). Effects of temperature, combustion, and emissions were experimentally investigated on this experimental engine. The temperature, combustion, and emissions characteristics were compared between the original neat diesel mode and the BDCC mode. The engine speeds were set to be 2,250, 2,800, and 3,350 rpm, and the engine loads were set to be 25, 50, 75, and 100%, respectively. The experimental results demonstrated that the intake temperature, the combustion temperature, and the exhaust temperature were decreased under BDCC mode, compared with that of the original neat diesel mode. The form of heat release rate was significantly changed using the BDCC mode, and the maximum combustion pressure of BDCC mode was higher than that of diesel mode. Under the low load, the ignition delay of BDCC mode was longer than that of original neat diesel mode, which caused the heat release was much more centralized and the peak of heat release was much higher. Under the high load, BDCC mode had two peak values of the heat release rate, the first small peak was formed by the small partial self-ignition of n-butanol, and the second peak was formed by the heat release of n-butanol and diesel compound combustion. The diesel engine operating with the BDCC mode could simultaneously reduce the and soot emissions but increase the total hydrocarbons (THC) and carbon monoxide (CO) emissions compared with the original neat diesel engine.
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Acknowledgments
The authors would like to acknowledge the financial support provided by the National Natural Science Foundation of China (NSFC) (Grant No. 51406137), and the State Key Laboratory of Engines, Tianjin University (Grant No. K2015-06).
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Published In
Journal of Energy Engineering
Volume 144 • Issue 2 • April 2018
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©2018 American Society of Civil Engineers.
History
Received: Jun 15, 2017
Accepted: Aug 14, 2017
Published online: Jan 9, 2018
Published in print: Apr 1, 2018
Discussion open until: Jun 9, 2018
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