Study on the combustion limit, near-limit extinction boundary, and flame regimes of low-Lewis-number CH4/O2/CO2 counterflow flames under microgravity

Okuno, Tomoya; Nakamura, Hisashi; Tezuka, T.; Hasegawa, Susumu; Takase, Koichi; Katsuta, Masato; Kikuchi, Masao; Maruta, Kaoru

doi:10.1016/j.combustflame.2016.07.001

Combustion and Flame

2016

DOI: 10.1016/j.combustflame.2016.07.001

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Study on the combustion limit, near-limit extinction boundary, and flame regimes of low-Lewis-number CH4/O2/CO2 counterflow flames under microgravity

Tomoya Okuno

Hisashi Nakamura

T. Tezuka

et al.

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Cited by 10 publications

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“…We call these flames "ball-like flames" based on their appearance. This terminology is commonly used for enclosed nearly-spherical or ellipsoidal flamelets in low Lewis number lean-limit mixtures[13,14,19,30].…”

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confidence: 99%

Effect of Lewis number on ball-like lean limit flames

Zhou

Shoshin

Pérez

et al. 2018

Combustion and Flame

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The lean limit flames for three different fuel compositions premixed with air, representing three different mixture Lewis numbers, stabilized inside a tube in a downward flow are examined by experiments and numerical simulations. The CH * chemiluminescence distribution in CH 4 -air and CH 4 -H 2 -air flames and the OH * chemiluminescence distribution in H 2 -air flames are recorded in the experiments. Cell-like flames are observed for the CH 4 -air mixture for all tested equivalence ratios. However, for CH 4 -H 2 -air and H 2 -air flames, ball-like lean limit flames are observed. Flame temperature fields are measured using Rayleigh scattering. The experimentally observed lean limit flames are predicted qualitatively by numerical simulation with the mixture-averaged transport model and skeletal mechanism of CH 4 . The results of the simulations show that the entire lean limit flame of CH 4 -H 2 -air and H 2 -air mixtures are located inside a recirculation zone. However, for the lean limit CH 4 -air flame, only the leading edge is located inside the recirculation zone.A flame structure with negative flame displacement speed is observed for the leading edges of the predicted lean limit flames with all three different fuel compositions. As compared with 1D planar flames, the fuel transport caused by convection is less significant in the present 2D lean limit flames for the three different fuel compositions. For the trailing edges of the three predicted lean limit flames, a diffusion dominated flame structure is observed.

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confidence: 99%

Effect of Lewis number on ball-like lean limit flames

Zhou

Shoshin

Pérez

et al. 2018

Combustion and Flame

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Flammability limit of moderate- and low-stretched premixed flames stabilized in planar channel

Mokrin

Odintsov

Tezuka

et al. 2017

Combustion and Flame

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Broken C-shaped extinction curve and near-limit flame behaviors of low Lewis number counterflow flames under microgravity

Okuno

Akiba

Nakamura

et al. 2018

Combustion and Flame

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Study on the combustion limit, near-limit extinction boundary, and flame regimes of low-Lewis-number CH4/O2/CO2 counterflow flames under microgravity

Cited by 10 publications

References 26 publications

Effect of Lewis number on ball-like lean limit flames

Effect of Lewis number on ball-like lean limit flames

Flammability limit of moderate- and low-stretched premixed flames stabilized in planar channel

Broken C-shaped extinction curve and near-limit flame behaviors of low Lewis number counterflow flames under microgravity

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