Experimental Investigation of a Heavy-Duty CI Engine Retrofitted to Natural Gas SI Operation

[+] Author and Article Information
Jinlong Liu

PO Box 6106 ESB 276 Morgantown, WV 26506 jlliu@mix.wvu.edu

Hemanth K. Bommisetty

PO Box 6106 275 ESB Morgantown, WV 26506 hebommisetty@mix.wvu.edu

Cosmin E. Dumitrescu

P.O.Box 6106 / 275 ESB Morgantown, WV 26506 cedumitrescu@mail.wvu.edu

1Corresponding author.

Contributed by the Internal Combustion Engine Division of ASME for publication in the Journal of Energy Resources Technology. Manuscript received May 2, 2019; final manuscript received May 7, 2019; published online xx xx, xxxx. Assoc. Editor: Hameed Metghalchi.

ASME doi:10.1115/1.4043749 History: Received May 02, 2019; Accepted May 07, 2019


Heavy-duty compression-ignition (CI) engines converted to natural gas (NG) operation can reduce the dependence on petroleum-based fuels and curtail greenhouse gas emissions. Such an engine was converted to premixed NG spark-ignition (SI) operation through the addition of a gas injector in the intake manifold and of a spark plug in place of the diesel injector. Engine performance and combustion characteristics were investigated at several lean-burn operating conditions that changed fuel composition, spark timing, equivalence ratio, and engine speed. While the engine operation was stable, the re-entrant bowl-in-piston (a characteristic of a CI engine) influenced the combustion event such as producing a significant late-combustion, particularly for advanced spark timing. This was due to an important fraction of the fuel burning late in the squish region, which affected the end of combustion, the combustion duration, and the cycle-to-cycle variation. However, the lower cycle-to-cycle variation, stable combustion event, and the lack of knocking suggest a successful conversion of conventional diesel engines to NG SI operation using the approach described here.

Copyright © 2019 by ASME
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