Characteristics of combustion in a narrow channel with a temperature gradient

Maruta, Kaoru; Kataoka, Takuya; Kim, Namil; Minaev, Sergey; Fursenko, Roman

doi:10.1016/j.proci.2004.08.245

Cited by 457 publications

(261 citation statements)

References 18 publications

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“…7, qualitatively confirmed the upper and middle branches of the Sshaped curve predicted by the analytical solution for the stoichiometric mixtures [27]. We consider that the pelton-like flame and the traveling flames have an analogy to the flames with repetitive extinction and ignition (FREI) in the 1D case [18,25].…”

Section: Resultssupporting

confidence: 77%

“…1 for the 2D radial microchannel [27]. The theoretical analysis [25] qualitatively agrees with our experimental findings in the 1D straight microchannel [18]. It is noteworthy that the weak stable flames were observed by camera with CH filter and a long enough exposure time, e.g., 1200 s. For the case of 2D radial microchannel, some previous experimental data for the stoichiometric mixtures are shown in Fig.…”

Section: Introductionsupporting

confidence: 86%

“…Before fuel supply, wall temperature profiles were created by using cold airflow. This approach was also employed in the series of previous studies [17][18][19][20][21]23,24]. Figure 4 shows the typical wall temperature profiles at an inlet airflow velocity of 4.0 m/s.…”

Section: Experimental Setup and Methodsmentioning

confidence: 99%

“…In our group, Maruta et al [17,18] have studied the combustion behavior of premixed CH 4 / air mixtures in a heated quartz tube with a 2.0-mm diameter. In their investigations, a stable premixed flame was found to exist at high and low mixture velocities.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Experimental and numerical investigations of flame pattern formations in a radial microchannel

Fan

Minaev

Sereshchenko

et al. 2009

Proceedings of the Combustion Institute

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Section: Resultssupporting

confidence: 77%

Section: Introductionsupporting

confidence: 86%

Section: Experimental Setup and Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Experimental and numerical investigations of flame pattern formations in a radial microchannel

Fan

Minaev

Sereshchenko

et al. 2009

Proceedings of the Combustion Institute

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“…The thermal coupling of methane and propane flames with the walls of a straight micro-channel with a step-wise wall temperature profile revealed a complex flame dynamics [9,10]. These works showed that stoichiometric or near-stoichiometric mixtures give stable flames in the high and low incoming velocity regions and unstable flames in the middle velocity region, with flame extinctions and re-ignitions that are repeated periodically in time.…”

Section: Introductionmentioning

confidence: 98%

Effect of the equivalence ratio, Damköhler number, Lewis number and heat release on the stability of laminar premixed flames in microchannels

Sánchez–Sanz

Fernández-Galisteo

Kurdyumov

2014

Combustion and Flame

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This is a postprint version of the following published document:Sánchez-Sanz, M. ; Fernández-Galisteo, D. ; Kurdyumov, V. N. Effect of the equivalence ratio, Damköhler number, Lewis number and heat release on the stability of laminar premixed flames in microchannels. Combustion and Flame, 2014, 161 (5) The effect of the equivalence ratio on the stability and dynamics of a premixed flame in a planar microchannel with a step-wise wall temperature profile is numerically investigated using the thermo-diffusive approximation. To characterize the stability behavior of the flame, we construct the stability maps delineating the regions with different flame dynamics in the inlet mass flow rate m vs. the equivalence ratio / parametric space. The flame stability is analyzed for fuels with different diffusivity by changing the Lewis numbers in the range 0:3 6 Le F 6 1:4. On the other hand, the Lewis number of the oxidizer is kept constant and equal to unity Le O ¼ 1. Our results show that, for very diffusive fuels, the stability of the flame varies significantly with the equivalence ratio, transitioning from stable flames for lean mixtures to highly unstable flames when / > 1. As the fuel Lewis number approaches unity, the stability behavior of the flame for lean and rich mixtures becomes more similar to give, in the equidiffusional case Le F ¼ 1, a symmetric stability map around the stoichiometric mixture / ¼ 1. In all cases considered, the most stable flames are always found around the stoichiometric mixtures / ¼ 1, when the flame instabilities are completely suppressed for very diffusive fuels Le F < 1, or are reduced to a narrow range of inflow velocities for fuel Lewis numbers equal or greater than unity.The ratio between the size of the channel and the flame thickness d turns out to be of great importance in the stability behavior of the flame. Keeping the rest of parameters constant, an increase in d for lean flames makes the flame considerably more unstable, confirming the findings of previous works. Nevertheless, as the stoichiometric ratio approaches / ¼ 1, that trend is reversed to give flames that become more stable as the size of the channel is increased.

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Electro‐spraying and Combustion of Ethanol in a Micro‐scale Combustor under Combined Electric Field

Gan¹,

Tong²,

Chen³

2016

Energy Technology 2016: Carbon Dioxide Management and Other Technologies

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Characteristics of combustion in a narrow channel with a temperature gradient

Cited by 457 publications

References 18 publications

Experimental and numerical investigations of flame pattern formations in a radial microchannel

Experimental and numerical investigations of flame pattern formations in a radial microchannel

Effect of the equivalence ratio, Damköhler number, Lewis number and heat release on the stability of laminar premixed flames in microchannels

Electro‐spraying and Combustion of Ethanol in a Micro‐scale Combustor under Combined Electric Field

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