Journal of the Combustion Society of Japan
Online ISSN : 2424-1687
Print ISSN : 1347-1864
ISSN-L : 1347-1864
Volume 49 , Issue 148
Showing 1-7 articles out of 7 articles from the selected issue
FEATURE—Recent Development of Post Petroleum Fuel and its Adaptation in Combustion Process
SERIAL LECTURE—Recent Research of Ignition IV
  • Chulju AHN, Fumiteru AKAMATSU, Masashi KATSUKI, Akio KITAJIMA, Yoshiki ...
    2007 Volume 49 Issue 148 Pages 119-127
    Published: 2007
    Released: April 13, 2019

    Effects of turbulent intensity on the flame structure in an opposed jet burner have been investigated for a methane/air mixture by conducting time-series temperature fluctuation, OH-LIPF, and double-probe ion current measurements. Combustion regime of the flames also has been discussed. With an increase of turbulent intensity under the condition of Karlovitz number larger than unity, the results show that the preheat zone thickness of local turbulent flamelet increases, while the reaction zone thickness keeps almost constant or gets thinner compared to that of laminar premixed flames. Flames of Karlovitz number larger than unity are more reasonable to be classified to the thin reaction zones regime rather than the distributed reaction zone regime.

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  • Tsukasa AIKAWA, Hiroshi YAMASHITA, Kazuhiro YAMAMOTO
    2007 Volume 49 Issue 148 Pages 128-136
    Published: 2007
    Released: April 13, 2019

    A high emphasis is placed on reducing environmental pollutant in combustion gas, because of an increasing concern about global environmental problem. Honeycomb catalyst is commonly used for NO reduction in exhaust gas. But, the measurement of concentration in the honeycomb is very difficult, because it is assembled with a lot of millimetersized channels. So, it is necessary to investigate the physical quantity by the numerical simulation and to understand the phenomenon in the honeycomb. The detailed elementary reaction kinetics for CH4-air combustion gas and Rh catalytic surface are considered. The details of NO reduction in a channel, such as mass fraction in the gas and catalytic surface and coverage are obtained. Especially, the effects of exhaust gas composition on NO deoxidization by catalytic reaction are estimated, and the catalytic reaction mechanism becomes clear.

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