Positively charged species in premixed flames fuelled by H2/CO mixture: Experimental and numerical study

2020 ◽  
Author(s):  
D. A. Knyazkov ◽  
I. E. Gerasimov ◽  
A. G. Shmakov ◽  
T. A. Bolshova ◽  
A. A. Paletsky
Keyword(s):  
Numerical Study ◽  
Premixed Flames ◽  
Charged Species ◽  
Positively Charged

Structure and propagation speeds of turbulent premixed flames—A numerical study

1991 ◽  
Vol 83 (1-2) ◽  
pp. 155-173 ◽  
Author(s):  
Sherif H. El Tahry ◽  
Christopher Rutland ◽  
Joel Ferziger
Keyword(s):  
Numerical Study ◽  
Premixed Flames ◽  
Turbulent Premixed Flames ◽  
Turbulent Premixed

scholarly journals Numerical study of the superadiabatic flame temperature phenomenon in hydrocarbon premixed flames

2002 ◽  
Vol 29 (2) ◽  
pp. 1543-1550 ◽  
Author(s):  
Fengshan Liu ◽  
Hongsheng Guo ◽  
Gregory J. Smallwood ◽  
Ömer L. Gülder
Keyword(s):  
Numerical Study ◽  
Flame Temperature ◽  
Premixed Flames

The Effects of Fuel and Air Mixtures in Non-Premixed Combustion for a Bluff-Body Flame

2015 ◽  
Author(s):  
Lu Chen ◽  
Francine Battaglia
Keyword(s):  
Bluff Body ◽  
Numerical Study ◽  
Premixed Flames ◽  
Turbulence Models ◽  
Premixed Combustion ◽  
Oh Radicals ◽  
No Emission ◽  
Combustion Modeling ◽  
High Specific Heat ◽  
Low Levels

The bluff-body stabilized flame is used in a numerical study of the non-premixed flames. This paper shows numerical investigations on the effects of hydrogen compositions and nonflammable diluent mixtures on the combustion and NO emission characteristics of syngas non-premixed flames for a bluff-body burner. The assessment of turbulent non-premixed combustion modeling techniques is presented and discussed. The simulations study the predictive capabilities of five turbulence models and are compared with the experiments of Correa and Gulati [1] for a non-premixed flame of 27.5%CO/32.3%H2/40.2%N2 and air. The Realizable k-ε and the Reynolds Stress (RSM) models were found to perform the best. Based on this, a numerical study to assess the effects of hydrogen component on syngas non-premixed combustion was performed. As a result, hydrogen addition caused the radial velocity and strain rate to decrease, which was important for mixing to decrease NO. Also, the effectiveness of nonflammable diluent mixtures, including N2, CO2 and H2O, were characterized in terms of the ability to reduce NO emission in syngas non-premixed flames. Results indicated that CO2 was the most effective diluent to reduce NO emission and H2O was more effective than N2. CO2 diluent produced low levels of OH radical, which makes CO2 the most effective diluent. Although H2O increased OH radicals, it was still effective to decrease the thermal NO because of its high specific heat.

A Numerical Study on the Effect of Water Addition on NO Formation in Counterflow CH4/Air Premixed Flames

2005 ◽  
Author(s):  
Hongsheng Guo ◽  
Stuart W. Neill ◽  
Gregory J. Smallwood
Keyword(s):  
Numerical Study ◽  
Temperature Drop ◽  
Flame Temperature ◽  
Premixed Flames ◽  
Chemical Effect ◽  
Water Addition ◽  
Detailed Chemistry ◽  
Effect Of Water ◽  
No Formation ◽  
The Rich

The effect of water addition on NO formation in counterflow CH4/air premixed flames was investigated by numerical simulation. Detailed chemistry and complex thermal and transport properties were employed. The results show that the addition of water to a flame suppresses the formation of NO primarily due to the flame temperature drop. Among a lean, a stoichiometric and a rich premixed flame, the effectiveness of water addition is most significant for the stoichiometric flame and least for the rich flame, since the dominant NO formation mechanism varies. The addition of water also reduces the formation of NO in a flame because of chemical effect that increases the concentration of OH, while reduces the concentrations of O and H. Compared to the stoichiometric flame, the chemical effect is intensified in the lean and rich flames.

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