Experimental Study on the Effects of Air Supply Control on Combustion and Emissions Performance at Medium and Low Load for a Dual-Fuel Diesel Engine

Yu-Hui Peng, Yu-Peng Huang, Jia-You Tang, Qi-Feng Huang and Yi-Ran Huang
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Yu-Hui Peng: School of Mechanical Engineering and Automation, Fuzhou University, Fuzhou 350116, China
Yu-Peng Huang: School of Mechanical Engineering and Automation, Fuzhou University, Fuzhou 350116, China
Jia-You Tang: School of Mechanical Engineering and Automation, Fuzhou University, Fuzhou 350116, China
Qi-Feng Huang: School of Mechanical Engineering and Automation, Fuzhou University, Fuzhou 350116, China
Yi-Ran Huang: Fujian Lijia Co., Ltd., Zhangzhou 363006, China

Energies, 2018, vol. 11, issue 11, 1-14

Abstract: Lowering the amount of excess air is believed to increase the density of the air-fuel mixture and help improve the combustion rate for compression ignition engines. This paper proposes an approach of adding a throttle body at the intake pipe to control the excess air ratio with reduction of air supply to achieve a better balance between the power, emissions and fuel efficiency at medium and low load of a natural gas dual-fuel diesel engine converted from a conventional diesel engine. Various experiments in both pure diesel and dual-fuel mode under intermediate engine speed are performed with the proposed critical method of excess air ratio control. The experimental results reveal that better excess air ratio is very beneficial for the power output and brake specific energy consumption in dual-fuel combustion under medium and low load conditions. Moreover, the substitution rate can reach as high as 40% under low load conditions with throttle control.

Keywords: excess air ratio; dual-fuel engine; natural gas; substitution rate; 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: 2018
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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