Numerical study on near-blowoff characteristics of cavity-stabilized premixed flames in supersonic flows

2017 ◽  
Author(s):  
Hongbo Wang ◽  
Peibo Li ◽  
Yanxiang Zhang ◽  
Ming Bo Sun
Keyword(s):  
Numerical Study ◽  
Premixed Flames ◽  
Supersonic Flows

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.

Numerical study of hydrogen jet flames in supersonic flows - Effect of shock waves

1998 ◽  
Author(s):  
J.-H. Kim ◽  
Y. Yoon ◽  
J.-Y. Choi ◽  
I.-S. Jeung
Keyword(s):  
Shock Waves ◽  
Numerical Study ◽  
Supersonic Flows ◽  
Jet Flames

scholarly journals How can vorticity be produced in irrotationally forced flows?

2010 ◽  
Vol 6 (S274) ◽  
pp. 373-375
Author(s):  
Fabio Del Sordo ◽  
Axel Brandenburg
Keyword(s):  
Viscous Fluid ◽  
Interstellar Medium ◽  
Numerical Study ◽  
Supersonic Flows ◽  
First Approximation

AbstractA spherical hydrodynamical expansion flow can be described as the gradient of a potential. In that case no vorticity should be produced, but several additional mechanisms can drive its production. Here we analyze the effects of baroclinicity, rotation and shear in the case of a viscous fluid. Those flows resemble what happens in the interstellar medium. In fact in this astrophysical environment supernovae explosion are the dominant flows and, in a first approximation, they can be seen as spherical. One of the main difference is that in our numerical study we examine only weakly supersonic flows, while supernovae explosions are strongly supersonic.

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