scholarly journals Frequency Response of Counter Flow Diffusion Flames to Strain Rate Harmonic Oscillations

2008 ◽  
Vol 180 (5) ◽  
pp. 767-784 ◽  
Author(s):  
A. Cuoci ◽  
A. Frassoldati ◽  
T. Faravelli ◽  
E. Ranzi
Keyword(s):  
Strain Rate ◽  
Frequency Response ◽  
Diffusion Flames ◽  
Counter Flow ◽  
Harmonic Oscillations

scholarly journals Effects of strain rate and CO2 on no formation in CH4/N2/O2 counter-flow diffusion flames

2018 ◽  
Vol 22 (Suppl. 2) ◽  
pp. 769-776
Author(s):  
Fei Ren ◽  
Longkai Xiang ◽  
Huaqiang Chu ◽  
Weiwei Han
Keyword(s):  
Strain Rate ◽  
Diffusion Flames ◽  
Numerical Study ◽  
Flame Temperature ◽  
Co2 Concentration ◽  
No Production ◽  
Counter Flow ◽  
Detailed Chemistry ◽  
No Formation ◽  
Key Factor

The reduction of nitrogen oxides in the high temperature flame is the key factor affecting the oxygen-enriched combustion performance. A numerical study using an OPPDIF code with detailed chemistry mechanism GRI 3.0 was carried out to focus on the effect of strain rate (25-130 s?1) and CO2 addition (0-0.59) on the oxidizer side on NO emission in CH4 / N2 / O2 counter-flow diffusion flame. The mole fraction profiles of flame structures, NO, NO2 and some selected radicals (H, O, OH) and the sensitivity of the dominant reactions contributing to NO formation in the counter-flow diffusion flames of CH4\/ N2 /O2 and CH4 / N2 / O2 / CO2 were obtained. The results indicated that the flame temperature and the amount of NO were reduced while the sensitivity of reactions to the prompt NO formation was gradually increased with the increasing strain rate. Furthermore, it is shown that with the increasing CO2 concentration in oxidizer, CO2 was directly involved in the reaction of NO consumption. The flame temperature and NO production were decreased dramatically and the mechanism of NO production was transformed from the thermal to prompt route.

Pulsating diffusion flames fed with biomass particles in counter-flow arrangement: Zeldovich and Lewis numbers effects

2021 ◽  
Vol 46 ◽  
pp. 101263
Author(s):  
Shahin Akbari ◽  
Moein Farmahini Farahani ◽  
Sadegh Sadeghi ◽  
Masoud Hajivand ◽  
Fei Xu ◽  
...  
Keyword(s):  
Diffusion Flames ◽  
Counter Flow ◽  
Biomass Particles

Entropy generation in turbulent syngas counter-flow diffusion flames

2017 ◽  
Vol 42 (49) ◽  
pp. 29532-29544 ◽  
Author(s):  
Khadidja Safer ◽  
Ahmed Ouadha ◽  
Fouzi Tabet
Keyword(s):  
Entropy Generation ◽  
Diffusion Flames ◽  
Counter Flow

Effects of Heat Losses on Edge-flame Instabilities in Low Strain Rate Counterflow Diffusion Flames

2006 ◽  
Vol 30 (10) ◽  
pp. 996-1002
Author(s):  
June-Sung Park ◽  
Dong-Jin Hwang ◽  
Jeong-Soo Kim ◽  
Sang-In Keel ◽  
Tae-Kwon Kim ◽  
...  
Keyword(s):  
Strain Rate ◽  
Diffusion Flames ◽  
Heat Losses ◽  
Counterflow Diffusion Flames ◽  
Flame Instabilities ◽  
Low Strain Rate

Edge flame instability in low-strain-rate counterflow diffusion flames

2006 ◽  
Vol 146 (4) ◽  
pp. 612-619 ◽  
Author(s):  
J PARK ◽  
D HWANG ◽  
J PARK ◽  
J KIM ◽  
S KIM ◽  
...  
Keyword(s):  
Strain Rate ◽  
Diffusion Flames ◽  
Flame Instability ◽  
Counterflow Diffusion Flames ◽  
Low Strain Rate
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