Effects of Different Exhaust Gas Recirculation (EGR) Rates on Combustion and Emission Characteristics of Biodiesel–Diesel Blended Fuel Based on an Improved Chemical Mechanism

Huiqiong Huang, Jie Tian, Jiangtao Li and Dongli Tan
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Huiqiong Huang: School of Mechanical and Automotive Engineering, Guangxi University of Science and Technology, Liuzhou 545006, China
Jie Tian: School of Mechanical and Automotive Engineering, Guangxi University of Science and Technology, Liuzhou 545006, China
Jiangtao Li: School of Mechanical and Automotive Engineering, Guangxi University of Science and Technology, Liuzhou 545006, China
Dongli Tan: Guangxi Key Laboratory of Automobile Components and Vehicle Technology, Liuzhou 545006, China

Energies, 2022, vol. 15, issue 11, 1-23

Abstract: This paper studies the effects of different exhaust gas recirculation (EGR) rates (0%, 5%, 10%, and 15%) on the combustion, performance, and emission characteristics of a biodiesel–diesel (20% biodiesel + 80% diesel) blended fuel engine. This paper mainly analyzes the effects on engine cylinder temperature, cylinder pressure, brake thermal efficiency (BTE), brake-specific fuel consumption (BSFC), NO x emissions, carbon monoxide (CO) emissions, hydrocarbon (HC) emissions, and soot emissions. Firstly, a 3D-CFD model was established by using CONVERGE software, combined with an improved chemical kinetic mechanism including 98 species and 314 reactions, and the accuracy of the simulation model was verified by experimental results. Secondly, the effects of different EGR rates on the combustion, performance, and emission characteristics of biodiesel–diesel blended fuel were studied. The results showed that with the increase in the EGR rate, the cylinder pressure and cylinder temperature in the cylinder decreased. When the EGR rate was 15%, the maximum cylinder temperature decreased by 4.33%. In addition, BSFC increased and BTE decreased. Moreover, with the increase in the EGR rate, NO x decreased significantly, and the higher the EGR rate, the more obvious the reduction in NO x emissions. When the EGR rate was 15%, NO x was reduced by 78.89%. However, with the increase in the EGR rate, the emissions of soot, HC, and CO increased. The optimal EGR rate for the engine is 10%.

Keywords: exhaust gas recirculation; biodiesel–diesel; combustion characteristic; emission (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: 2022
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