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Analysis of CO Emission Sources in Diesel Combustion (First Report)~In-Cylinder CO Imaging Using 2-Photon Excitation LIF
Published October 12, 2011 by Society of Automotive Engineers of Japan in Japan
To analyze the carbon monoxide (CO) emission sources in diesel combustion, an in-cylinder CO imaging technique using two-photon excitation LIF was developed. While overlapping of the light emitted by the soot particles, over the weak CO fluorescence, became a serious problem, it was solved by optimizing the imaging direction, and by increasing the level of laser irradiation used for LIF excitation. The results of in-cylinder CO-LIF imaging were compared with the results obtained with CFD simulation and the agreement was found to be excellent. The results of LIF and CFD showed that the major source of CO emissions under low load conditions is the over-diffusion of the pilot sprays. These prevent the local temperature from rising sufficiently to oxidize the CO.
- Hideki Aoki - Toyota Industries
- Tsutomu Umehara - Toyota Industries
- Takayuki Fuyuto - Toyota Central R&D Labs.
- Takafumi Matsumoto - Toyota Central R&D Labs.
- Yoshiaki Hattori - Toyota Central R&D Labs.
- Reiko Ueda - Toyota Central R&D Labs.
- Kazuhiro Akihama - Toyota Central R&D Labs.
- Hisaki Ito - Toyota Motor
- Akio Kawaguchi - Toyota Motor