The present study investigated the effects of biodiesel blending under a wide range of intake oxygen concentration levels in a diesel engine. This study attempted to identify the lowest biodiesel blending rate that achieves acceptable levels of nitric oxides (NOx), soot, and coefficient of variation in the indicated mean effective pressure (COVIMEP). Biodiesel blending was to be minimized in order to reduce the fuel penalty associated with the biodiesels lower caloric value (LCV). Engine experiments were performed in a 1 l single-cylinder diesel engine at an engine speed of 1400 rev/min under a medium load condition. The blend rate and intake oxygen concentration were varied independently of each other at a constant intake pressure of 200 kPa. The biodiesel blend rate varied from 0% (B000) to 100% biodiesel (B100) at a 20% increment. The intake oxygen level was adjusted from 8% to 19% by volume (vol. %) in order to embrace both conventional and low-temperature combustion (LTC) operations. A fixed injection duration of 788 ms at a fuel rail pressure of 160 MPa exhibited a gross indicated mean effective pressure (IMEP) between 750 kPa and 910 kPa, depending on the intake oxygen concentration. The experimental results indicated that the intake oxygen level had to be below 10 vol. % to achieve the indicated specific NOx (ISNOx) below 0.2 g/kW h with the B000 fuel. However, a substantial soot increase was exhibited at such a low intake oxygen level. Biodiesel blending reduced NOx until the blending rate reached 60% with reduced in-cylinder temperature due to lower total energy release. As a result, 60% biodiesel-blended diesel (B060) achieved NOx, soot, and COVIMEP of 0.2 g/kW h, 0.37 filter smoke number (FSN), and 0.5, respectively, at an intake oxygen concentration of 14 vol. %. The corresponding indicated thermal efficiency was 43.2%.
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April 2016
Research-Article
Enhancing Low-Temperature Combustion With Biodiesel Blending in a Diesel Engine at a Medium Load Condition
Sunyoup Lee,
Sunyoup Lee
Department of Engine Research,
Environmental and Energy Systems
Research Division,
Korea Institute of Machinery and Materials,
Daejeon 305-343, South Korea
e-mail: sunylee@kimm.re.kr
Environmental and Energy Systems
Research Division,
Korea Institute of Machinery and Materials,
Daejeon 305-343, South Korea
e-mail: sunylee@kimm.re.kr
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Seungmook Oh,
Seungmook Oh
Department of Engine Research,
Environmental and Energy Systems
Research Division,
Korea Institute of Machinery and Materials,
Daejeon 305-343, South Korea
e-mail: mook@kimm.re.kr
Environmental and Energy Systems
Research Division,
Korea Institute of Machinery and Materials,
Daejeon 305-343, South Korea
e-mail: mook@kimm.re.kr
Search for other works by this author on:
Junghwan Kim,
Junghwan Kim
Department of Engine Research,
Environmental and Energy Systems
Research Division,
Korea Institute of Machinery and Materials,
Daejeon 305-343, South Korea
e-mail: jkim77@kimm.re.kr
Environmental and Energy Systems
Research Division,
Korea Institute of Machinery and Materials,
Daejeon 305-343, South Korea
e-mail: jkim77@kimm.re.kr
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Duksang Kim
Duksang Kim
Advanced Combustion and Engine
Research Team,
Doosan Infracore, Inc.,
Yongin, Gyeonggi 448-795, South Korea
e-mail: duksang.kim@doosan.co.kr
Research Team,
Doosan Infracore, Inc.,
Yongin, Gyeonggi 448-795, South Korea
e-mail: duksang.kim@doosan.co.kr
Search for other works by this author on:
Sunyoup Lee
Department of Engine Research,
Environmental and Energy Systems
Research Division,
Korea Institute of Machinery and Materials,
Daejeon 305-343, South Korea
e-mail: sunylee@kimm.re.kr
Environmental and Energy Systems
Research Division,
Korea Institute of Machinery and Materials,
Daejeon 305-343, South Korea
e-mail: sunylee@kimm.re.kr
Seungmook Oh
Department of Engine Research,
Environmental and Energy Systems
Research Division,
Korea Institute of Machinery and Materials,
Daejeon 305-343, South Korea
e-mail: mook@kimm.re.kr
Environmental and Energy Systems
Research Division,
Korea Institute of Machinery and Materials,
Daejeon 305-343, South Korea
e-mail: mook@kimm.re.kr
Junghwan Kim
Department of Engine Research,
Environmental and Energy Systems
Research Division,
Korea Institute of Machinery and Materials,
Daejeon 305-343, South Korea
e-mail: jkim77@kimm.re.kr
Environmental and Energy Systems
Research Division,
Korea Institute of Machinery and Materials,
Daejeon 305-343, South Korea
e-mail: jkim77@kimm.re.kr
Duksang Kim
Advanced Combustion and Engine
Research Team,
Doosan Infracore, Inc.,
Yongin, Gyeonggi 448-795, South Korea
e-mail: duksang.kim@doosan.co.kr
Research Team,
Doosan Infracore, Inc.,
Yongin, Gyeonggi 448-795, South Korea
e-mail: duksang.kim@doosan.co.kr
1Corresponding author.
Contributed by the Combustion and Fuels Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received June 13, 2015; final manuscript received September 3, 2015; published online October 28, 2015. Editor: David Wisler.
J. Eng. Gas Turbines Power. Apr 2016, 138(4): 041506 (8 pages)
Published Online: October 28, 2015
Article history
Received:
June 13, 2015
Revised:
September 3, 2015
Citation
Lee, S., Oh, S., Kim, J., and Kim, D. (October 28, 2015). "Enhancing Low-Temperature Combustion With Biodiesel Blending in a Diesel Engine at a Medium Load Condition." ASME. J. Eng. Gas Turbines Power. April 2016; 138(4): 041506. https://doi.org/10.1115/1.4031621
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