Effect of ammonia/oxygen/nitrogen equivalence ratio on spherical turbulent flame propagation of pulverized coal/ammonia co-combustion

2020 ◽  
Author(s):  
Yu Xia ◽  
Khalid Hadi ◽  
Genya Hashimoto ◽  
Nozomu Hashimoto ◽  
Osamu Fujita
Keyword(s):  
Flame Propagation ◽  
Equivalence Ratio ◽  
Turbulent Flame ◽  
Pulverized Coal

scholarly journals Spherical turbulent flame propagation of pulverized coal particle clouds in an O2/N2 atmosphere

2019 ◽  
Vol 37 (3) ◽  
pp. 2935-2942 ◽  
Author(s):  
Khalid Hadi ◽  
Ryo Ichimura ◽  
Nozomu Hashimoto ◽  
Osamu Fujita
Keyword(s):  
Flame Propagation ◽  
Coal Particle ◽  
Turbulent Flame ◽  
Pulverized Coal ◽  
N2 Atmosphere ◽  
Particle Clouds

Comparison of a spectral model for premixed turbulent flame propagation to DNS and experiments

2000 ◽  
Vol 4 (3) ◽  
pp. 241-264 ◽  
Author(s):  
Mark Ulitsky ◽  
Chaouki Ghenaï ◽  
Iskender Gökalp ◽  
Lian-Ping Wang ◽  
Lance R Collins
Keyword(s):  
Flame Propagation ◽  
Turbulent Flame ◽  
Spectral Model ◽  
Premixed Turbulent Flame

Flame Characteristics and Turbulent Flame Speeds of Turbulent, High-Pressure, Lean Premixed Methane/Air Flames

2005 ◽  
Author(s):  
P. Griebel ◽  
R. Bombach ◽  
A. Inauen ◽  
R. Scha¨ren ◽  
S. Schenker ◽  
...  
Keyword(s):  
Flame Front ◽  
Gas Turbines ◽  
Equivalence Ratio ◽  
Turbulent Flame ◽  
Flame Speed ◽  
Operating Conditions ◽  
Turbulent Flame Speed ◽  
Front Position ◽  
Preheating Temperature ◽  
Lean Premixed

The present experimental study focuses on flame characteristics and turbulent flame speeds of lean premixed flames typical for stationary gas turbines. Measurements were performed in a generic combustor at a preheating temperature of 673 K, pressures up to 14.4 bars (absolute), a bulk velocity of 40 m/s, and an equivalence ratio in the range of 0.43–0.56. Turbulence intensities and integral length scales were measured in an isothermal flow field with Particle Image Velocimetry (PIV). The turbulence intensity (u′) and the integral length scale (LT) at the combustor inlet were varied using turbulence grids with different blockage ratios and different hole diameters. The position, shape, and fluctuation of the flame front were characterized by a statistical analysis of Planar Laser Induced Fluorescence images of the OH radical (OH-PLIF). Turbulent flame speeds were calculated and their dependence on operating conditions (p, φ) and turbulence quantities (u′, LT) are discussed and compared to correlations from literature. No influence of pressure on the most probable flame front position or on the turbulent flame speed was observed. As expected, the equivalence ratio had a strong influence on the most probable flame front position, the spatial flame front fluctuation, and the turbulent flame speed. Decreasing the equivalence ratio results in a shift of the flame front position farther downstream due to the lower fuel concentration and the lower adiabatic flame temperature and subsequently lower turbulent flame speed. Flames operated at leaner equivalence ratios show a broader spatial fluctuation as the lean blow-out limit is approached and therefore are more susceptible to flow disturbances. In addition, because of a lower turbulent flame speed these flames stabilize farther downstream in a region with higher velocity fluctuations. This increases the fluctuation of the flame front. Flames with higher turbulence quantities (u′, LT) in the vicinity of the combustor inlet exhibited a shorter length and a higher calculated flame speed. An enhanced turbulent heat and mass transport from the recirculation zone to the flame root location due to an intensified mixing which might increase the preheating temperature or the radical concentration is believed to be the reason for that.

The role of low temperature fuel chemistry on turbulent flame propagation

2014 ◽  
Vol 161 (2) ◽  
pp. 475-483 ◽  
Author(s):  
Sang Hee Won ◽  
Bret Windom ◽  
Bo Jiang ◽  
Yiguang Ju
Keyword(s):  
Low Temperature ◽  
Flame Propagation ◽  
Turbulent Flame

scholarly journals Hydrogen–air turbulent flame propagation in the presence of microdroplets

2016 ◽  
Vol 774 ◽  
pp. 012091
Author(s):  
S P Medvedev ◽  
S V Khomik ◽  
O G Maximova ◽  
G L Agafonov ◽  
V N Mikhalkin ◽  
...  
Keyword(s):  
Flame Propagation ◽  
Turbulent Flame
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