Effects of Injection Timing on Combustion and Emission Performance of Dual-Fuel Diesel Engine under Low to Medium Load Conditions

Hua Zhou, Hong-Wei Zhao, Yu-Peng Huang, Jian-Hui Wei and Yu-Hui Peng
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Hua Zhou: School of Mechanical and Aerospace Engineering, Jilin University, Changchun 130022, China
Hong-Wei Zhao: School of Mechanical and Aerospace Engineering, Jilin University, Changchun 130022, China
Yu-Peng Huang: School of Mechanical Engineering and Automation, Fuzhou University, Fuzhou 350116, China
Jian-Hui Wei: School of Mechanical Engineering and Automation, Fuzhou University, Fuzhou 350116, China
Yu-Hui Peng: China Automotive Technology and Research Center Co., Ltd., Tianjin 300300, China

Energies, 2019, vol. 12, issue 12, 1-14

Abstract: A throttle can be installed on the intake pipe of a natural gas (NG)/diesel dual-fuel engine to control the excess air ratio of the air-fuel mixture by adjusting the air intake. Building on a previously proposed NG/diesel dual-fuel supply strategy using the adjustment of excess air ratio, this work further studied the effects of different injection timing schemes on output power, fuel efficiency, and pollutant emissions of a dual-fuel engine under low to medium load conditions. In the experiment, the engine was operated at a speed of 1600 r/min, under either low (27.1 N·m) or medium (50.6 N·m) loads, and the NG substitution rate was either 40%, 60%, or 80%. The effect of different injection timing schemes on the combustion performance of the engine under low to medium load conditions was studied based on in-cylinder pressure changes detected by a pressure sensor. Experimental results showed that under medium-speed low-load conditions and a NG substitution rate of 40%, setting the diesel injection timing to 27 °CA BTDC increased the engine output power by 9.03%, reduced the brake specific energy consumption (BSEC) by 13.33%, and effectively reduced CO, CO 2 , and HC emissions. Under medium-speed medium-load conditions with a NG substitution rate of 80%, setting the diesel injection timing to 25 °CA BTDC increased the engine output power by 14.62%, reduced the BSEC by 11.73%, and significantly reduced CO, CO 2 , and HC emissions.

Keywords: excess air ratio; dual-fuel engine; natural gas; substitution rate; injection timing; bench test (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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