Results 211 to 220 of about 2,511 (241)
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Proceedings of the Combustion Institute, 2009
Dynamic features of a freely propagating turbulent premixed flame under global stretch rate oscillations were investigated by utilizing a jet-type low-swirl burner equipped with a high-speed valve on the swirl jet line. The bulk flow velocity, equivalence ratio and the nominal mean swirl number were 5†m/s, 0.80 and 1.23, respectively.
Tachibana, Shigeru +4 more
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Dynamic features of a freely propagating turbulent premixed flame under global stretch rate oscillations were investigated by utilizing a jet-type low-swirl burner equipped with a high-speed valve on the swirl jet line. The bulk flow velocity, equivalence ratio and the nominal mean swirl number were 5†m/s, 0.80 and 1.23, respectively.
Tachibana, Shigeru +4 more
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Diffusion flame extinction at small stretch rates: The mechanism of radiative loss
Combustion and Flame, 1986Abstract A theoretical analysis of diffusion flame extinction in the stagnation point region of a condensed fuel has been made including radiative heat loss from the fuel surface. In addition to the blowoff limit normally found when flame stretch rate is large, an extinction limit has been identified when the flame stretch rate becomes sufficiently ...
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Proceedings of the Combustion Institute, 2009
Abstract A 1.5 m long turbulent-wake combustion vessel with a 0.15 m × 0.15 m cross-sectional area is proposed for spatiotemporal measurements of curvature, strain, dilatation and burning rates along a freely downward-propagating premixed flame interacting with a parallel row of staggered vortex pairs having both compression (negative) and extension (
I.F. Huang +4 more
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Abstract A 1.5 m long turbulent-wake combustion vessel with a 0.15 m × 0.15 m cross-sectional area is proposed for spatiotemporal measurements of curvature, strain, dilatation and burning rates along a freely downward-propagating premixed flame interacting with a parallel row of staggered vortex pairs having both compression (negative) and extension (
I.F. Huang +4 more
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Combustion and Flame, 2006
This study focuses on the effects of flame stretch on the mass burning rate, for flames with nonunit Lewis numbers. The extended flame stretch model of de Goey and ten Thije Boonkkamp [Combust. Flame 119 (1999) 253–271], which was derived for multiple-species transport and chemistry, is used as a starting point.
Swart, de, J.A.M. +4 more
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This study focuses on the effects of flame stretch on the mass burning rate, for flames with nonunit Lewis numbers. The extended flame stretch model of de Goey and ten Thije Boonkkamp [Combust. Flame 119 (1999) 253–271], which was derived for multiple-species transport and chemistry, is used as a starting point.
Swart, de, J.A.M. +4 more
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On the mean stretch rate over a finite flame segment
2009In this work, an approach is suggested to determine the mean flame stretch rate for a finite segment of a thin flame, in particular, for the entire flame. The suggested approach does not require averaging of local stretch rate at multiple flame locations. It is evidenced that available theoretical predictions of the mean stretch rate, which rely on the
Shoshyn, Y., Goey, de, L.P.H.
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Experimental study on methane-air premixed flame extinction at small stretch rates in microgravity
Symposium (International) on Combustion, 1996Extinction experiments on counterflow methane-air premixed flame at small stretch rates were conducted under microgravity conditions to measure the fuel concentration of the mixture at extinction over a range of very low stretch rates and to observe extinction characteristics of small stretch-rate flames in which radiative heat loss may be dominant. By
Kaoru Maruta +3 more
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2023
In the onset of the exa-scale era, Direct Numerical Simulations are becoming more achievable thanks to the increase in computational power (10^18 flops), new computing architectures and more efficient solution algorithms. This enables the execution of larger and more realistic simulations, on the order of billions of grid points, Reynolds numbers close
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In the onset of the exa-scale era, Direct Numerical Simulations are becoming more achievable thanks to the increase in computational power (10^18 flops), new computing architectures and more efficient solution algorithms. This enables the execution of larger and more realistic simulations, on the order of billions of grid points, Reynolds numbers close
openaire +2 more sources
Experimental determination of strain rates in stretched laminar diffusion flames
2014A laser Doppler anemometer was used to measure the axial and radial velocity components of hydrogen-air counterflow diffusion flames (CFDF). An axisymmetric opposed jet burner (OJB) used seeded air in one cylindrical tube, and a hydrogen-nitrogen mixture in the opposing cylindrical tube.
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