Chemical effects of CO2 addition to oxidizer and fuel streams on flame structure in H2-O2 counterflow diffusion flames

2003 ◽  
Vol 27 (13) ◽  
pp. 1205-1220 ◽  
Author(s):  
Jeong Park ◽  
Dong-Jin Hwang ◽  
Jong-Geun Choi ◽  
Kee-Man Lee ◽  
Sang-In Keel ◽  
...  
Keyword(s):  
Diffusion Flames ◽  
Flame Structure ◽  
Counterflow Diffusion Flames ◽  
Chemical Effects ◽  
Co2 Addition

scholarly journals A Study on Flame Structure and NO Emission in FIR- and FGR-applied Methane-air Counterflow Diffusion Flames

2016 ◽  
Vol 21 (1) ◽  
pp. 38-45
Author(s):  
Jeong Park ◽  
Oh Boong Kwon ◽  
Sewon Kim ◽  
Changyeop Lee ◽  
Sang-In Keel ◽  
...  
Keyword(s):  
Diffusion Flames ◽  
Flame Structure ◽  
No Emission ◽  
Counterflow Diffusion Flames

scholarly journals Effect of the Preheated Oxidizer Temperature on Soot Formation and Flame Structure in Turbulent Methane-Air Diffusion Flames at 1 and 3 atm: A CFD Investigation

Energies ◽  
2021 ◽  
Vol 14 (12) ◽  
pp. 3671
Author(s):  
Subrat Garnayak ◽  
Subhankar Mohapatra ◽  
Sukanta K. Dash ◽  
Bok Jik Lee ◽  
V. Mahendra Reddy
Keyword(s):  
Mole Fraction ◽  
Air Temperature ◽  
Reaction Rate ◽  
Volume Fraction ◽  
Diffusion Flames ◽  
Soot Formation ◽  
Flame Structure ◽  
Soot Volume Fraction ◽  
Computational Domain ◽  
Pressure Elevation

This article presents the results of computations on pilot-based turbulent methane/air co-flow diffusion flames under the influence of the preheated oxidizer temperature ranging from 293 to 723 K at two operating pressures of 1 and 3 atm. The focus is on investigating the soot formation and flame structure under the influence of both the preheated air and combustor pressure. The computations were conducted in a 2D axisymmetric computational domain by solving the Favre averaged governing equation using the finite volume-based CFD code Ansys Fluent 19.2. A steady laminar flamelet model in combination with GRI Mech 3.0 was considered for combustion modeling. A semi-empirical acetylene-based soot model proposed by Brookes and Moss was adopted to predict soot. A careful validation was initially carried out with the measurements by Brookes and Moss at 1 and 3 atm with the temperature of both fuel and air at 290 K before carrying out further simulation using preheated air. The results by the present computation demonstrated that the flame peak temperature increased with air temperature for both 1 and 3 atm, while it reduced with pressure elevation. The OH mole fraction, signifying reaction rate, increased with a rise in the oxidizer temperature at the two operating pressures of 1 and 3 atm. However, a reduced value of OH mole fraction was observed at 3 atm when compared with 1 atm. The soot volume fraction increased with air temperature as well as pressure. The reaction rate by soot surface growth, soot mass-nucleation, and soot-oxidation rate increased with an increase in both air temperature and pressure. Finally, the fuel consumption rate showed a decreasing trend with air temperature and an increasing trend with pressure elevation.

PAHs controlling soot nucleation in 0.101—0.811MPa ethylene counterflow diffusion flames

2021 ◽  
Vol 227 ◽  
pp. 384-395
Author(s):  
Kevin Gleason ◽  
Francesco Carbone ◽  
Alessandro Gomez
Keyword(s):  
Diffusion Flames ◽  
Counterflow Diffusion Flames
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