Negative flame speed in an unsteady 2-D premixed flame: A computational study

1996 ◽  
Vol 26 (1) ◽  
pp. 323-329 ◽  
Author(s):  
Inge R. Gran ◽  
Tarek Echekki ◽  
Jacqueline H. Chen
Keyword(s):  
Computational Study ◽  
Flame Speed ◽  
Premixed Flame

Quantifying the role of Darrieus–Landau instability in turbulent premixed flame speed determination at various burner sizes

2021 ◽  
Vol 33 (2) ◽  
pp. 025104
Author(s):  
Xin Wang ◽  
Xiaobei Cheng ◽  
Hao Lu ◽  
Yishu Xu ◽  
Yang Liu ◽  
...  
Keyword(s):  
Flame Speed ◽  
Premixed Flame ◽  
Turbulent Premixed Flame ◽  
Landau Instability ◽  
Turbulent Premixed

A computational study of non-premixed flame extinction by water spray

2011 ◽  
Vol 33 (2) ◽  
pp. 2591-2597 ◽  
Author(s):  
P.G. Arias ◽  
H.G. Im ◽  
P. Narayanan ◽  
A. Trouvé
Keyword(s):  
Computational Study ◽  
Premixed Flame ◽  
Water Spray ◽  
Flame Extinction

scholarly journals Structure and Laminar Flame Speed of an Ammonia/Methane/Air Premixed Flame under Varying Pressure and Equivalence Ratio

2021 ◽  
Author(s):  
Rodolfo C. Rocha ◽  
Shenghui Zhong ◽  
Leilei Xu ◽  
Xue-Song Bai ◽  
Mário Costa ◽  
...  
Keyword(s):  
Equivalence Ratio ◽  
Laminar Flame ◽  
Flame Speed ◽  
Premixed Flame ◽  
Laminar Flame Speed

Experimental Study On Premixed Flame Acceleration In Closed Pipe

2013 ◽  
Vol 62 (1) ◽  
Author(s):  
M. H. Mat Kiah ◽  
R. M. Kasmani
Keyword(s):  
Experimental Study ◽  
Natural Gas ◽  
Equivalence Ratio ◽  
Flame Speed ◽  
The Other ◽  
Premixed Flame ◽  
High Mass ◽  
Mass Burning Rate ◽  
Straight Pipe ◽  
Flame Acceleration

An experimental study has been carried out to investigate the flame acceleration in closed pipe. A horizontal steel pipe, with 2 m long and 0.1 m diameter, giving L/D ratio of 20 was used in this project. For test with 90 degree bends, the bend has a radius of 0.1 m and added a further 1 m to the length of the pipe (based on the centerline length of the segment). Ignition was affected at one end of the vessel while the other end was closed. Natural gas/oxygen mixtures were studied with equivalence ratio, Ф ranges from 0.5 to 1.8. It was demonstrated that bending pipe gave three times higher in overpressure (5.5 bars) compared to 2.0 bars of straight pipe. It is also shown that the flame speed is 63 m s-1, greater by factor of ~ 3 for explosion in bending pipe in comparison with straight pipe (23 m s-1). This is due to bending acting similar to obstacles. This mechanism could induce and create more turbulence, initiating the combustion of unburned pocket at the corner region, causing high mass burning rate and hence, increasing the flame speed.

scholarly journals Influence of Turbulent Scalar Mixing Physics on Premixed Flame Propagation

2011 ◽  
Vol 2011 ◽  
pp. 1-8 ◽  
Author(s):  
H. Kolla ◽  
N. Swaminathan
Keyword(s):  
Direct Effect ◽  
Flame Propagation ◽  
Indirect Effect ◽  
Turbulent Flame ◽  
Quantitative Difference ◽  
Flame Speed ◽  
Premixed Flame ◽  
Scalar Mixing ◽  
Turbulent Flame Speed ◽  
Reactive Scalar

The influence of reactive scalar mixing physics on turbulent premixed flame propagation is studied, within the framework of turbulent flame speed modelling, by comparing predictive ability of two algebraic flame speed models: one that includes all relevant physics and the other ignoring dilatation effects on reactive scalar mixing. This study is an extension of a previous work analysing and validating the former model. The latter is obtained by neglecting modelling terms that include dilatation effects: a direct effect because of density change across the flame front and an indirect effect due to dilatation on turbulence-scalar interaction. An analysis of the limiting behaviour shows that neglecting the indirect effect alters the flame speed scaling considerably when is small and the scaling remains unaffected when is large. This is evident from comparisons of the two models with experimental data which show that the quantitative difference between the two models is as high as 66% at but only 4% at . Furthermore, neglecting the direct effect results in a poor prediction of turbulent flame speed for all values of , and both effects are important for practically relevant values of this velocity ratio.

Experimental and Computational Study of the Combustion Characteristics of Dual-Stage Lean Premixed Flame

2019 ◽  
Vol 33 (3) ◽  
pp. 2547-2555
Author(s):  
Wenhua Zhao ◽  
Li Liu ◽  
Wenkai Shen ◽  
Yajin Lyu ◽  
Penghua Qiu
Keyword(s):  
Computational Study ◽  
Combustion Characteristics ◽  
Premixed Flame ◽  
Lean Premixed ◽  
Dual Stage
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