Journal of the Combustion Society of Japan
Online ISSN : 2424-1687
Print ISSN : 1347-1864
ISSN-L : 1347-1864
Volume 44 , Issue 127
Showing 1-6 articles out of 6 articles from the selected issue
FEATURE—The Combustion Technologies for High Efficiency Engines
SERIAL LECTURE—Solid Fuel Combustion IV
ORIGINAL PAPER
  • Shinnosuke NISHIKI, Tatsuya HASEGAWA, Roland BORGHI, Ryutaro HIMENO
    Type: ORIGINAL PAPER
    2002 Volume 44 Issue 127 Pages 47-57
    Published: 2002
    Released: October 24, 2019
    JOURNALS FREE ACCESS

    Turbulent premixed flames propagating in homogeneous isotropic turbulent flows were simulated with a singlestep irreversible reaction. Two cases were calculated: case H, with a high-density ratio of flame ρub = 7.53, and case L, low-density ratio of flame ρub = 2.50, while u'/uL was nearly equal to unity. We obtained databases of fully developed stationary turbulent flames. We investigated transport properties in turbulent kinetic energy and turbulent scalar flux by analyzing the transport equations, and we modeled the important terms in the transport equations. Analysis based on the Favre-averaged transport equation for turbulent kinetic energy showed that pressure related terms produced kinetic energy in the flame brush. The mean pressure gradient term, pressure dilatation term and additional dissipation components were modeled and these models well mimicked DNS. On the other hand, analysis based on the Favre-averaged transport equation for turbulent scalar flux showed that pressure concerning terms and velocity-reaction rate correlation term were positive sources to produce counter-gradient diffusion. The mean pressure gradient term, fluctuating pressure term, dissipation terms and velocity-reaction rate correlation term were modeled and these models well represented DNS.

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  • Yasuhiro OGAMI, Hideaki KOBAYASHI
    Type: ORIGINAL PAPER
    2002 Volume 44 Issue 127 Pages 58-66
    Published: 2002
    Released: October 24, 2019
    JOURNALS FREE ACCESS

    Experimental and numerical studies on laminar burning velocities of a stoichiometric H2/O2 mixture, which was diluted by helium in order to exclude flame instabilities, were performed in the pressure range of 0.1 to 1.0 MPa and in the preheated-mixture temperature range of 300 to 500 K. Measurements of laminar burning velocities were conducted by a technique which measures the instantaneous local burning velocity using particle tracking velocimetry (PTV) and planar laser induced fluorescence (PLIF) simultaneously for burner-stabilized flames in a high-pressure chamber. Experimental results were compared with numerical results obtained considering some existing detailed reaction mechanisms, and the verification of reaction mechanisms was performed. A modification of the reaction mechanism was also conducted using the mechanism of Allen et al as a starting mechanism for the application in high-pressure and high temperature condition, and the modified mechanism was in good agreement with experimental data in the pressure dependency of laminar burning velocity.

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