The Proceedings of Mechanical Engineering Congress, Japan
Online ISSN : 2424-2667
ISSN-L : 2424-2667
2013
Session ID : G071022
Conference information
G071022 Analysis of Combustion Process in a DDF Engine Using a Rapid Compression/Expansion Machine
Takuma FUJIIYuya MATSUKAWAHiroshi KAWANABETakuji ISHIYAMA
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Abstract
Combustion of diesel dual fuel (DDF) was investigated using a rapid compression/expansion machine (RCEM). Ignition and spreading of burnt gas region were visualized by a high-speed color digital camera. According to the visualized images, auto-ignition occurs in the pilot-spray with a part of natural gas mixture, then the burnt gas, which is observed as a bright white region, spreads out. In the latter period of the combustion, a dark region, which corresponds to a hydrocarbon emission, still remains between the sprays. For a case of early injection, the burnt gas quickly moves out from a piston bowl to a squish area, so that the natural gas mixture in the center of the bowl does not burn completely. For a case of two-stage injection, injected fuel of the first part diffuses into the natural gas mixture and the combustion.
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© 2013 The Japan Society of Mechanical Engineers
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