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Improvement of Engine Combustion and Emission Characteristics by Fuel Property Modulation

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  • Kaijie Liang

    (Liaoning Provincial Key Laboratory of Energy Storage and Energy Utilization Technology, Yingkou Institute of Technology, Yingkou 115000, China)

  • Jinguang Liang

    (Liaoning Provincial Key Laboratory of Energy Storage and Energy Utilization Technology, Yingkou Institute of Technology, Yingkou 115000, China)

  • Guowei Li

    (Liaoning Provincial Key Laboratory of Energy Storage and Energy Utilization Technology, Yingkou Institute of Technology, Yingkou 115000, China)

  • Zhengri Shao

    (Liaoning Provincial Key Laboratory of Energy Storage and Energy Utilization Technology, Yingkou Institute of Technology, Yingkou 115000, China)

  • Zhipeng Jiang

    (School of Automotive Engineering, Jilin University, Changchun 130052, China)

  • Jincheng Feng

    (School of Automotive Engineering, Jilin University, Changchun 130052, China)

Abstract

The sustainability of diesel engines has come to the forefront of research with the growing global interest in reducing greenhouse gas emissions and improving energy efficiency. The aim of this paper is to support the goal of sustainable development by improving the volatile properties of diesel fuel to promote cleaner combustion in engines. In order to study the effect of diesel fuel volatility on spraying, combustion, and emission, the tests were carried out with the help of the constant volume chamber (CVC) test rig and an engine test rig, respectively. CVC test: A high-speed video camera recorded the spray characteristics of different volatile fuels in a constant-volume combustion bomb. The effects of different rail pressures and ambient back pressures on the spray characteristics were investigated. Engine test: The combustion and emission characteristics of different volatile diesel fuels under different load conditions (25%, 50%, 75%) were investigated in a four-stroke direct-injection diesel engine with the engine speed fixed at 2000 rpm. The test results show that as the rail pressure increases and the ambient pressure decreases, the spray characteristics of the fuels tend to increase; for the more volatile fuels, although reducing the spray tip penetration, the spray projected area and spray cone angle increase, which is conducive to improving the homogeneity of the fuel and air mixing in the cylinder. The improvement of fuel volatility can form more and better-quality mixtures within the ignition delay time (ID), resulting in a 1–2% increase in peak cylinder pressure and a 2–4% increase in peak heat release. For different loads, pre-injection heat release is generated to redefine the ID and combustion duration (CD). Improved fuel volatility effectively reduces carbon monoxide (CO) emissions by about 8–10% and hydrocarbon (HC) emissions by about 13–16%, but it increases nitrogen oxide (NOx) emissions by about 8–11%. Analyzing from the perspective of particulate matter (PM), combined with the aromatic content of volatile fuels, it is recommended to use fuels with moderate volatility and aromatic content under low load conditions, and at medium to large loads, the volatility of the fuel has less weight on particulates and more weight on aromatics, so it is desirable to use the fuel with the lowest volatility and lowest aromatic content of the fuel selected.

Suggested Citation

  • Kaijie Liang & Jinguang Liang & Guowei Li & Zhengri Shao & Zhipeng Jiang & Jincheng Feng, 2024. "Improvement of Engine Combustion and Emission Characteristics by Fuel Property Modulation," Sustainability, MDPI, vol. 16(23), pages 1-18, December.
    • Handle: RePEc:gam:jsusta:v:16:y:2024:i:23:p:10764-:d:1539319
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    References listed on IDEAS

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