Dilution effect of air stream on NO emission characteristic in H2/Ar counterflow diffusion flame

2002 ◽  
Vol 26 (6) ◽  
pp. 455-473 ◽  
Author(s):  
Jeong Park ◽  
Kyung-Hwan Lee ◽  
Ki-Seong Kim
Keyword(s):  
Diffusion Flame ◽  
Dilution Effect ◽  
Emission Characteristic ◽  
No Emission ◽  
Air Stream ◽  
Counterflow Diffusion Flame

scholarly journals Numerical study of the Effect of CO2 on the NH3/CH4 Counterflow Diffusion Flame in O2/CO2/N2 Atmosphere

2021 ◽  
Vol 898 (1) ◽  
pp. 012006
Author(s):  
Conghao Li ◽  
Jingfu Wang ◽  
Ying Chen ◽  
Xiaolei Zhang
Keyword(s):  
Diffusion Flame ◽  
Numerical Study ◽  
Flame Structure ◽  
Flame Temperature ◽  
Combustion Characteristics ◽  
No Emission ◽  
N2 Atmosphere ◽  
Fraction Increase ◽  
Temperature And Pressure ◽  
Counterflow Diffusion Flame

Abstract Ammonia, as a carbon-neutral fuel, draws people attentions recently. NH3/CH4 blends is considered as a kind of fuel. A numerical simulation of the effects of CO2 dilution on the combustion characteristics and NO emission of NH3/CH4 counterflow diffusion flame was conducted in this study. Diffusion flame structure, the influence of CO2 radiation characteristics on temperature and NO emission characteristics were studies at normal temperature and pressure. The dilution and radiation of CO2 reduce the flame temperature significantly. NO concentration decreased with the CO2 mole fraction increase effectively. The study extends the basic combustion characteristics of NH3 containing fuel.

Analysis of LPG diffusion flame in tube type burner

2019 ◽  
Vol 13 (3) ◽  
pp. 5278-5293
Author(s):  
Vipul Patel ◽  
Rupesh Shah
Keyword(s):  
Diffusion Flame ◽  
Emission Characteristic ◽  
Flame Stability ◽  
Liquefied Petroleum Gas ◽  
Air Velocity ◽  
Length Fraction ◽  
Low Emission ◽  
Tube Type ◽  
Stability Limits ◽  
Co Emission

The present research aims to analyse diffusion flame in a tube type burner with Liquefied petroleum gas (LPG) as a fuel. An experimental investigation is performed to study flame appearance, flame stability, Soot free length fraction (SFLF) and CO emission of LPG diffusion flame. Effects of varying air and fuel velocities are analysed to understand the physical process involved in combustion. SFLF is measured to estimate the reduction of soot. Stability limits of the diffusion flame are characterized by the blowoff velocity. Emission characteristic in terms of CO level is measured at different equivalence ratios. Experimental results show that the air and fuel velocity strongly influences the appearance of LPG diffusion flame. At a constant fuel velocity, blue zone increases and the luminous zone decreases with the increase in air velocity. It is observed that the SFLF increases with increasing air velocity at a constant fuel velocity. It is observed that the blowoff velocity of the diffusion flame increases as fuel velocity increases. Comparison of emission for flame with and without swirl indicates that swirl results in low emission of CO and higher flame stability. Swirler with 45° vanes achieved the lowest CO emission of 30 ppm at Φ = 1.3.

NO emission characteristic during fluidized combustion of biomass with limestone addition

Fuel ◽  
2021 ◽  
Vol 291 ◽  
pp. 120264
Author(s):  
Liu Xiaorui ◽  
Yang Xudong ◽  
Xie Guilin ◽  
Yu Yiming
Keyword(s):  
Emission Characteristic ◽  
No Emission

Effects of Air Temperature on Combustion Characteristics of LPG Diffusion Flame

2020 ◽  
Vol 1008 ◽  
pp. 128-138
Author(s):  
Ahmed M. Salman ◽  
Ibrahim A. Ibrahim ◽  
Hamada M. Gad ◽  
Tharwat M. Farag
Keyword(s):  
Air Temperature ◽  
Diffusion Flame ◽  
Nitrogen Addition ◽  
Flame Length ◽  
Combustion Characteristics ◽  
Operating Conditions ◽  
Low Oxygen ◽  
Air Temperatures ◽  
Air Stream ◽  
Wide Range

In the present study, the combustion characteristics of LPG gaseous fuel diffusion flame at elevated air temperatures were experimentally investigated. An experimental test rig was manufactured to examine a wide range of operating conditions. The investigated parameters are the air temperatures of 300, 350, 400, 450, and 500 K with constant percentage of nitrogen addition in combustion air stream of 5 % to give low oxygen concentration of 18.3 % by mass at constant air swirl number, air to fuel mass ratio, and thermal load of 1.5, 30, and 23 kW, respectively. The gaseous combustion characteristics were represented as axial and radial temperatures distributions, temperatures gradient, visible flame length and species concentrations. The results indicated that as the air temperature increased, the chemical reaction rate increased and flame volume decreased, the combustion time reduced leading to a reduction in flame length. The NO concentration reaches its maximum values near the location of the maximum centerline axial temperature. Increasing the combustion air temperature by 200 K, the NO consequently O2 concentrations are increased by about % 355 and 20 % respectively, while CO2 and CO concentrations are decreased by about % 21 and 99 % respectively, at the combustor end.

NOx emission from high-temperature air/methane counterflow diffusion flame

2002 ◽  
Vol 41 (7) ◽  
pp. 693-698 ◽  
Author(s):  
Ryugo Fuse ◽  
Hideaki Kobayashi ◽  
Yiguang Ju ◽  
Kaoru Maruta ◽  
Takashi Niioka
Keyword(s):  
High Temperature ◽  
Diffusion Flame ◽  
Nox Emission ◽  
Counterflow Diffusion Flame

The extinction limits of a hydrogen counterflow diffusion flame above liquid oxygen

2003 ◽  
Vol 135 (1-2) ◽  
pp. 87-96 ◽  
Author(s):  
Matthew Juniper ◽  
Nasser Darabiha ◽  
Sébastien Candel
Keyword(s):  
Diffusion Flame ◽  
Liquid Oxygen ◽  
Counterflow Diffusion Flame

scholarly journals Application of the “counterflow diffusion flame” method in simulating the final ballistics of ammunition based on reaction materials

2018 ◽  
pp. 37-45
Author(s):  
E. A. Khmelnikov ◽  
T. E. Zavodova ◽  
K. V. Smagin ◽  
S. F. Dubinina
Keyword(s):  
Mathematical Simulation ◽  
Diffusion Flame ◽  
Light Alloy ◽  
Additional Energy ◽  
Counterflow Diffusion Flame ◽  
Flame Method ◽  
Soft Targets

Due to the constant modernization of weapons and ammunition production, it has become necessary to search for new types of equipment. Within the research, we examine the possibility of using fluoroplastic as a reaction material which can replace explosives in ammunition used to destroy lightly armored and soft targets. The paper shows the results of experiments and mathematical simulation of the fluoroplastic striker penetrating into the light alloy barriers. The counterflow diffusion flame method was used to take into account the additional energy released as a result of interaction during the simulation

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