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Research Papers: Fuel Combustion

Effect of Biodiesel-Ethanol Blended Fuel Spray Characteristics on the Reduction of Exhaust Emissions in a Common-Rail Diesel Engine

[+] Author and Article Information
Seung Hyun Yoon, Su Han Park, Hyun Kyu Suh

Department of Mechanical Engineering, Hanyang University, 17 Haengdang-dong, Sungdong-gu, Seoul 133-791, Korea

Chang Sik Lee1

Department of Mechanical Engineering, Hanyang University, 17 Haengdang-dong, Sungdong-gu, Seoul 133-791, Koreacslee@hanyang.ac.kr

1

Corresponding author.

J. Energy Resour. Technol 132(4), 042201 (Jan 06, 2011) (7 pages) doi:10.1115/1.4003177 History: Received November 04, 2008; Revised November 23, 2010; Published January 06, 2011; Online January 06, 2011

An experimental investigation was performed to analyze the effects of biodiesel-ethanol blended fuel spray on the combustion, and exhaust emission characteristics in a single cylinder common-rail diesel engine. In order to analyze the macroscopic and microscopic characteristics of biodiesel blended fuel spray, parameters, such as injection rate, droplet diameter, and spray tip penetration, were measured using an injection rate meter system, spray visualization, and droplet measuring system. Also, measurements of combustion, exhaust emissions, and size distributions of particulate matter were carried out under various engine operating conditions for biodiesel-ethanol blends and the results were compared with those of conventional diesel fuel. In this investigation, the measured results of biodiesel-ethanol blended fuel show that the Sauter mean diameter decreased with the increase of relative velocity between the injected fuel and the ambient gas. Comparing the combustion characteristics of diesel fuel and biodiesel-ethanol blended fuels, both diesel and blended fuel show similar trends of combustion pressure and rate of heat release. However, the combustion of biodiesel-ethanol blends indicated lower combustion characteristics, such as combustion pressures and heat release rates, than those of diesel fuel because of its lower heating value. In the case of exhaust gas recirculation, the indicated specific NOx(ISNOx) and soot concentration results showed lower emissions compared with those of conventional diesel fuel.

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Copyright © 2010 by American Society of Mechanical Engineers
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Figures

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Figure 1

Spray visualization and droplet measuring system

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Figure 2

Schematic of experimental apparatus

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Figure 3

Injection rate profiles of biodiesel-ethanol blends and ULSD (mfuel=10 mg)

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Figure 4

Effect of the injection pressure and blending ratio on the spray tip penetration (mfuel=10 mg)

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Figure 5

Comparison of spray evolution process after the start of injection (Pamb=3.0 MPa)

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Figure 6

Spray droplet size distributions variation with axial distance from the nozzle (Pamb=0.1 MPa, mfuel=10 mg)

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Figure 7

Combustion characteristics of biodiesel-ethanol blends and ULSD with injection pressure (1500 rpm)

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Figure 8

Emission characteristics of biodiesel-ethanol blends and ULSD with injected fuel mass (Pinj=100 MPa, SOE=−8 deg ATDC, and 1500 rpm)

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Figure 9

Particulate size distributions characteristics of biodiesel-ethanol blends and ULSD with injection pressure (mfuel=10 mg, SOE=−8 deg ATDC, and 1500 rpm)

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Figure 10

Effect of EGR on the combustion characteristics of ULSD and biodiesel-ethanol blends (Pinj=100 MPa)

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Figure 11

Effect of EGR on the emission characteristics of ULSD and biodiesel-ethanol blends (Pinj=100 MPa and EGR 30%)

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