Effects of the Bore to Stroke Ratio on Combustion, Gaseous and Particulate Emissions in a Small Port Fuel Injection Engine Fueled with Ethanol Blended Gasoline

Jihwan Jang, Jonghui Choi, Hoseung Yi and Sungwook Park
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Jihwan Jang: School of Mechanical Engineering, Hanyang University, Seoul 133-791, Korea
Jonghui Choi: Department of Mechanical Convergence Engineering, Graduate School of Hanyang University, Seoul 04763, Korea
Hoseung Yi: Department of Mechanical Convergence Engineering, Graduate School of Hanyang University, Seoul 04763, Korea
Sungwook Park: School of Mechanical Engineering, Hanyang University, Seoul 133-791, Korea

Energies, 2020, vol. 13, issue 2, 1-15

Abstract: The purpose of this study is to analyze the combustion characteristics of the port fuel injection (PFI) engine considering the fuel mixing ratio, bore to stroke (B/S) ratio and gaseous and particle emissions. Experiments were conducted in a small single-cylinder PFI engine with a displacement of 125 cc. The fuel used in the experiment was a mixture of pure gasoline and ethanol. The engine was operated at 5000 rpm at full load and wide-open throttle. In addition, combustion and exhaust characteristics of the engines with a B/S ratio of 0.88 and 1.15 were analyzed. The combustion pressure inside the combustion chamber was measured to analyze the indicated mean effective pressure (IMEP) and the heat release rate, and the combustion rate was calculated. In the results of combustion characteristics by the difference of B/S ratio, the influence of flame propagation velocity and turbulence intensity is the largest. The 0.88 B/S ratio engine, which has a small bore, has a faster combustion rate than the 1.15 B/S ratio engine due to its larger flame surface area and larger turbulence intensity. This represents a higher efficiency combustion result. Finally, the high oxygen content of ethanol has the characteristic of decreasing soot formation and increasing particle oxidation.

Keywords: bore/stroke ratio; particle number; IMEP; heat release rate (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: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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