The objective of this study was to experimentally clarify the effect of two-stage split and early injection on the combustion and emission characteristics of a direct-injection (DI) diesel engine. Engine tests were carried out using a single-cylinder high-speed DI diesel engine and an injection system, combining an ordinary jerk pump and an electronically controlled high-pressure injection system, KD-3. In these experiments to compare the combustion and exhaust emission characteristics with two-stage split and early injection, a single-stage and early injection was tested. The FT-IR exhaust-gas analyzer simultaneously measured the exhaust emissions of 26 components. The results showed that HCHO, and were emitted during the very early stage of both single injection and two-stage injection. These concentrations were higher than those from diesel combustion with ordinary fuel injection timings. These exhaust emissions are characteristic components of combustion by premixed compression ignition with extremely early injection. In particular, the HCHO concentration in exhaust was reduced with an increase in the maximum rate of heat release after cool flame due to pre-reaction of pre-mixture. At extremely early injection, the concentration was extremely low; however, the indicated specific fuel consumption (ISFC) was higher than that of ordinary diesel combustion. In the case of two-stage injection, the degree of constant volume is increased, so that ISFC is improved. These results also demonstrated the possibility of reducing HCHO, and smoke emissions by means of two-stage split and early injection.
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e-mail: yamane@mech.usp.ac.jp
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July 2002
Technical Papers
Combustion and Emission Characteristics of Direct-Injection Compression Ignition Engines by Means of Two-Stage Split and Early Fuel Injection
K. Yamane,
e-mail: yamane@mech.usp.ac.jp
K. Yamane
Department of Mechanical Systems Engineering, The University of Shiga Prefecture, 2500 Hassaka, Hikone, Shiga 522-8533, Japan
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Y. Shimamoto
Y. Shimamoto
Department of Mechanical Systems Engineering, The University of Shiga Prefecture, 2500 Hassaka, Hikone, Shiga 522-8533, Japan
Search for other works by this author on:
K. Yamane
Department of Mechanical Systems Engineering, The University of Shiga Prefecture, 2500 Hassaka, Hikone, Shiga 522-8533, Japan
e-mail: yamane@mech.usp.ac.jp
Y. Shimamoto
Department of Mechanical Systems Engineering, The University of Shiga Prefecture, 2500 Hassaka, Hikone, Shiga 522-8533, Japan
Contributed by the Internal Combustion Engine Division of THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS for publication in the ASME JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received by the ICE Division, July 13, 2000; final revision received by the ASME Headquarters, December 5, 2001. Editor: D. N. Assanis.
J. Eng. Gas Turbines Power. Jul 2002, 124(3): 660-667 (8 pages)
Published Online: June 19, 2002
Article history
Received:
July 13, 2000
Revised:
December 5, 2001
Online:
June 19, 2002
Citation
Yamane, K., and Shimamoto, Y. (June 19, 2002). "Combustion and Emission Characteristics of Direct-Injection Compression Ignition Engines by Means of Two-Stage Split and Early Fuel Injection ." ASME. J. Eng. Gas Turbines Power. July 2002; 124(3): 660–667. https://doi.org/10.1115/1.1473157
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