The Effects of Pressure on Turbulent Burning Velocity and Quenching, and Markstein Number of Premixed Flame

The effects of laminar burning velocity, turbulence intensity, flame size and eddy size on the turbulent burning velocity of a premixed growing flame were experimentally separated in a 125 mm cubical chamber with lean methane-air mixtures spark ignited at 1 atm and 300 K. The turbulence was up to 2 m/s with 1 to 4 mm Taylor microscale. For the near unity Lewis number and near zero Markstein number mixture considered here, the turbulent burning velocity, St, can be approximated as: St = Sl + Cd(r/λ)u′, where Sl is the laminar burning velocity, r is the mean flame radius, λ is the Taylor microscale, u′ is the root mean square (r.m.s.) turbulence intensity and Cd is a constant of the order 0.02.

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Analysis of Turbulent Burning Velocity of Spherically Propagating Premixed Flame with Effective Turbulence Intensity

Journal of Thermal Science and Technology ◽

10.1299/jtst.7.507 ◽

2012 ◽

Vol 7 (4) ◽

pp. 507-521 ◽

Cited By ~ 11

Author(s):

Akihiro HAYAKAWA ◽

Yukito MIKI ◽

Yukihide NAGANO ◽

Toshiaki KITAGAWA

Keyword(s):

Turbulence Intensity ◽

Burning Velocity ◽

Premixed Flame ◽

Turbulent Burning Velocity

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Turbulent burning velocity of ammonia/oxygen/nitrogen premixed flame in O2-enriched air condition

Fuel ◽

10.1016/j.fuel.2020.117383 ◽

2020 ◽

Vol 268 ◽

pp. 117383 ◽

Cited By ~ 6

Author(s):

Yu Xia ◽

Genya Hashimoto ◽

Khalid Hadi ◽

Nozomu Hashimoto ◽

Akihiro Hayakawa ◽

...

Keyword(s):

Burning Velocity ◽

Premixed Flame ◽

Turbulent Burning Velocity

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219 Effects of Pressure on Turbulent Burning Velocity and Quenching of Premixed Flame

The Proceedings of Conference of Kyushu Branch ◽

10.1299/jsmekyushu.2005.71 ◽

2005 ◽

Vol 2005 (0) ◽

pp. 71-72

Author(s):

Toshiaki KITAGAWA ◽

Kousaku TSUNEYOSHI

Keyword(s):

Burning Velocity ◽

Premixed Flame ◽

Turbulent Burning Velocity

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Study of Thermo-Diffusive Effects on Iso-Octane/Air Flames at Fixed Turbulence Karlovitz Number

ASME/JSME 2011 8th Thermal Engineering Joint Conference ◽

10.1115/ajtec2011-44221 ◽

2011 ◽

Cited By ~ 2

Author(s):

Akihiro Hayakawa ◽

Tomohiro Takeo ◽

Yukito Miki ◽

Yukihide Nagano ◽

Toshiaki Kitagawa

Keyword(s):

Equivalence Ratio ◽

Burning Velocity ◽

Turbulent Flame ◽

Turbulent Flames ◽

Laminar Burning Velocity ◽

Markstein Number ◽

Flame Stretch ◽

The Mean ◽

Diffusive Effects ◽

Turbulent Burning Velocity

Spherically propagating laminar and turbulent flames were studied using iso-octane / air mixtures with and without dilution. The main purpose of this study is to clarify the influence of thermo-diffusive effects on the turbulent flames. In order to examine the thermo-diffusive effects solely by separating them from the effects of flame stretch, turbulent burning velocities were compared at constant flame stretch factors. The mean flame stretch factor acting on turbulent flame front may be represented by the turbulence Karlovitz number. Thus, turbulent explosions were carried out at fixed turbulence Karlovitz numbers. The ratio of turbulent burning velocity to unstretched laminar burning velocity increased with the equivalence ratio for non-diluted mixtures at fixed turbulence Karlovitz numbers. And this ratio for CO2 diluted mixtures was larger than N2 diluted mixtures. The Markstein number that denotes the sensitivity of the flame to thermo-diffusive effects depends on the equivalence ratio and diluents of the mixture. The ratio of turbulent burning velocity to unstretched laminar one increased with decreasing Markstein number. Especially, it changed stepwise around Markstein number of zero. However, the burning velocity ratios did not increase with increasing mixture pressure although the Markstein number decreased with pressure.

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