A numerical study on heat-recirculation assisted combustion for small scale jet diffusion flames at near-extinction condition

2017 ◽  
Vol 178 ◽  
pp. 182-194 ◽  
Author(s):  
Jian Gao ◽  
Akter Hossain ◽  
Tsuneyoshi Matsuoka ◽  
Yuji Nakamura
Keyword(s):  
Diffusion Flames ◽  
Numerical Study ◽  
Small Scale ◽  
Extinction Condition ◽  
Jet Diffusion Flames ◽  
Heat Recirculation ◽  
Near Extinction

Joint planar CH and OH lif imaging in piloted turbulent jet diffusion flames near extinction

1992 ◽  
Vol 24 (1) ◽  
pp. 341-349 ◽  
Author(s):  
S.H. Strner ◽  
R.W. Bilger ◽  
R.W. Dibble ◽  
R.S. Barlow ◽  
D.C. Fourguette ◽  
...  
Keyword(s):  
Diffusion Flames ◽  
Turbulent Jet ◽  
Jet Diffusion Flames ◽  
Near Extinction

Experimental and numerical study on the quenching limits and mechanism of small-scale H2 diffusion flames

2020 ◽  
Vol 45 (58) ◽  
pp. 34281-34291
Author(s):  
Xing Li ◽  
Shengrong Xie ◽  
Jing Zhang ◽  
Daiqing Zhao ◽  
Xiaohan Wang
Keyword(s):  
Diffusion Flames ◽  
Numerical Study ◽  
Small Scale

Numerical Study on Merging and Interaction of Jet Diffusion Flames

2018 ◽  
Vol 140 (10) ◽  
Author(s):  
T. C. Ho ◽  
S. C. Fu ◽  
Christopher Y. H. Chao ◽  
Sharad Gupta
Keyword(s):  
High Velocity ◽  
Diffusion Flames ◽  
Numerical Study ◽  
Separation Distance ◽  
Flame Height ◽  
Jet Flame ◽  
Jet Diffusion Flames ◽  
Pressure Relief Valves ◽  
Computational Fluid Dynamics Cfd ◽  
The Individual

A high velocity jet fire can cause catastrophic failure due to flame impingement or radiation. The scenario becomes more complicated when multiple jet fires exist following ignition of release from pressure relief valves (PRV) as the thermal effect not only distorts the individual jet flame but also changes the flame height and temperature profile and such kind of high velocity jet flames have not been studied in the past. Therefore, prediction of the flame shape including the merging and interaction of multiple jet fires is essential in risk analysis. In this paper, fire interaction of two high velocity (>10 m/s) jet fires is investigated using computational fluid dynamics (CFD) techniques. Different radiation models are analyzed and validated by experimental data from the literature. Based on the simulation result, the merging of high velocity jet fires is divided into three stages. An empirical equation considering the fire interaction for the average flame height with different release velocities and separation distance is developed. The flame height increases dramatically when the separation distance decreases resulting in a shortage of oxygen. So, part of the methane is reacted in a higher height, which explains the change in the merging flame height and temperature.

scholarly journals Effect of Burner Wall Material on Microjet Hydrogen Diffusion Flames near Extinction: A Numerical Study

Energies ◽  
2021 ◽  
Vol 14 (24) ◽  
pp. 8266
Author(s):  
Aravind Muraleedharan ◽  
Jithin Edacheri Veetil ◽  
Akram Mohammad ◽  
Sudarshan Kumar ◽  
Ratna Kishore Velamati
Keyword(s):  
Thermal Radiation ◽  
Wall Thickness ◽  
Hydrogen Diffusion ◽  
Diffusion Flames ◽  
Numerical Study ◽  
Flame Temperature ◽  
Flame Height ◽  
Wall Material ◽  
Minor Effect ◽  
Near Extinction

Characteristics of microjet hydrogen diffusion flames stabilized near extinction are investigated numerically. Two-dimensional simulations are carried out using a detailed reaction mechanism. The effect of burner wall material, thickness, and thermal radiation on flame characteristics such as flame height and maximum flame temperature are studied. Results show that the flame stabilizes at lower fuel jet velocities for quartz burner than steel or aluminum. Higher flame temperatures are observed for low conductive burners, whereas the flame length increases with an increase in thermal conductivity of the burner. Even though thermal radiation has a minor effect on flame characteristics like flame temperature and flame height, it significantly influences the flame structure for low conductive burner materials. The burner tip and its vicinity are substantially heated for low conductive burners. The effect of burner wall thickness on flame height is significant, whereas it has a more negligible effect on maximum flame temperature. Variation in wall thickness also affects the distribution of H and HO2 radicals in the flame region. Although the variation in wall thickness has the least effect on the overall flame shape and temperature distribution, the structure near the burner port differs.

Effects of partial gravity and g-jitter radiation from jet diffusion flames

1997 ◽  
Author(s):  
M. Bahadori ◽  
L. Zhou ◽  
D. Stocker ◽  
M. Bahadori ◽  
L. Zhou ◽  
...  
Keyword(s):  
Diffusion Flames ◽  
Jet Diffusion Flames ◽  
Partial Gravity ◽  
Jitter Radiation

A PIV investigation of weakly buoyant laminar jet diffusion flames

2000 ◽  
Author(s):  
Mark Wernet ◽  
Paul Greenberg ◽  
Peter Sunderland ◽  
William Yanis
Keyword(s):  
Diffusion Flames ◽  
Laminar Jet ◽  
Jet Diffusion Flames

Piloted Diffusion Flames of Diluted Methane Near Extinction: Detailed Structure from Laser Measurements

1990 ◽  
Vol 72 (4-6) ◽  
pp. 255-269 ◽  
Author(s):  
S. H. STÅRNER ◽  
R W. BILGER ◽  
R. W. DIBBLE ◽  
R. S. BARLOW
Keyword(s):  
Diffusion Flames ◽  
Detailed Structure ◽  
Laser Measurements ◽  
Near Extinction
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