Nitrogen dilution effect on stability limits of methane and propane turbulent lifted jet diffusion flame

2015 ◽  
pp. 597-600
Author(s):  
Ye Yan ◽  
Haitao Zhang ◽  
Nianpeng Jiang ◽  
Taohong Ye
Keyword(s):  
Diffusion Flame ◽  
Dilution Effect ◽  
Nitrogen Dilution ◽  
Stability Limits

scholarly journals The dilution effect on the extinction of wall diffusion flame

2014 ◽  
Vol 35 (4) ◽  
pp. 43-54
Author(s):  
Nadjib Ghiti
Keyword(s):  
Dilution Rate ◽  
Diffusion Flame ◽  
Flame Temperature ◽  
Dilution Effect ◽  
Lateral Wall ◽  
Flame Extinction ◽  
Jet Flame ◽  
Extinction Process ◽  
Nitrogen Dilution ◽  
Flame Response

Abstract The dynamic process of the interaction between a turbulent jet diffusion methane flame and a lateral wall was experimentally studied. The evolution of the flame temperature field with the Nitrogen dilution of the methane jet flame was examined. The interaction between the diffusion flame and the lateral wall was investigated for different distance between the wall and the central axes of the jet flame. The dilution is found to play the central role in the flame extinction process. The flame response as the lateral wall approaches from infinity and the increasing of the dilution rate make the flame extinction more rapid than the flame without dilution, when the nitrogen dilution rate increase the flame temperature decrease.

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.

Extended Le Chatelier's formula and nitrogen dilution effect on the flammability limits

2006 ◽  
Vol 41 (5) ◽  
pp. 406-417 ◽  
Author(s):  
Shigeo Kondo ◽  
Kenji Takizawa ◽  
Akifumi Takahashi ◽  
Kazuaki Tokuhashi
Keyword(s):  
Dilution Effect ◽  
Flammability Limits ◽  
Nitrogen Dilution

scholarly journals Nitrogen Dilution and Extinction Effects for Methane Impinging Diffusion Flame

IERI Procedia ◽  
2012 ◽  
Vol 1 ◽  
pp. 39-46 ◽  
Author(s):  
Nadjib Ghiti ◽  
Abed Alhalim Bentebbiche ◽  
Ramzi Boulkroune
Keyword(s):  
Diffusion Flame ◽  
Nitrogen Dilution

scholarly journals Dilution Effect on the Extinction of Impinging Diffusion Flame with a Lateral Wall

2013 ◽  
Vol 1 (2) ◽  
pp. 30-33 ◽  
Author(s):  
Nadjib Ghiti ◽  
Abed Alhalim Bentebbiche ◽  
Ramzi Boulkroune
Keyword(s):  
Diffusion Flame ◽  
Dilution Effect ◽  
Lateral Wall

Nitrogen Diluted Jet Flames in the Presence of Coflowing Air

2011 ◽  
Author(s):  
James D. Kribs ◽  
Tamir S. Hasan ◽  
Kevin M. Lyons
Keyword(s):  
Diffusion Flame ◽  
Axial Position ◽  
Flammability Limit ◽  
Jet Flames ◽  
Flow Rates ◽  
Nitrogen Dilution ◽  
Flame Shape ◽  
Methane Flow

The purpose of this study is to observe methane jet flames under varying levels of nitrogen dilution and coflowing air. The jet flames were examined in order to determine the conditions for which liftoff and blowout occur under conditions that strain the flame. Methane flow rates were varied, corresponding to intermediate lifted positions to blowout. A sequence of images were taken at each level of dilution and coflow, and were used to determine the lowest radial and axial position of the flammability limit. These flammability regions were compared to the lean flammability limit. It was observed that flame shape and liftoff were considerably more influenced by the effects of the coflowing air compared to the presence of the diluents, and that flames under coflow lost the trailing diffusion flame earlier, which has been shown to be a marker for flame blowout.

Diffusion Flame Stability of Low Calorific Fuels

2015 ◽  
Vol 362 ◽  
pp. 29-37 ◽  
Author(s):  
N.R. Caetano ◽  
T.Z. Stapasolla ◽  
F.B. Peng ◽  
P.S. Schneider ◽  
F.M. Pereira ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Diffusion Flame ◽  
Large Scale ◽  
Industrial Applications ◽  
Flame Stabilization ◽  
Flame Stability ◽  
Classical Literature ◽  
Regions Of Stability ◽  
Lift Off ◽  
Stability Limits

Mechanisms related to diffusion flame stabilization have been the subject of several studies within the last decades due the industrial and scientific interests. Information on flame stability is of fundamental importance in energy efficiency and safety regarding industrial applications. Thus, an experimental study was performed in order to examine the flame characteristics and regions of stability limits. In this study, a representative burner of industrial applications was employed, which allows the stabilization of several combustion regimes. The lift-off and blow-out flame regimes were investigated for different proportions of carbon dioxide in natural gas. In this way, an analysis of the calorific fuel influence on the flame stability was performed based on the measurements and a comparison with classical literature models was done. The fuel dilution by adding carbon dioxide was found to decrease the soot production, leading to lower flame heights and also, lower lift-off and blow-out limits. Results obtained from this study encourage future works which consider flames in large scale, in order to equate to industrial applications.

Nitrogen dilution effect on flame stability in a lifted non-premixed turbulent hydrogen jet with coaxial air

Fuel ◽  
2010 ◽  
Vol 89 (7) ◽  
pp. 1492-1498 ◽  
Author(s):  
Jeongseog Oh ◽  
Qasim Sarwar Khan ◽  
Youngbin Yoon
Keyword(s):  
Dilution Effect ◽  
Flame Stability ◽  
Nitrogen Dilution
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