Kinetic mechanisms for premixed, laminar, steady state methane/air flames

Coffee, Terence P.

doi:10.1016/0010-2180(84)90024-5

Cited by 62 publications

(24 citation statements)

References 15 publications

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“…This is an effect of that the rate of production of OH radicals from chain branching reactions in the H2-0 2 reaction system increases with the amount of hydrogen. However, OH radicals are also produced from chain propagation reactions of various flame intermediates, such as, CHO, CH20 , and H 02 [29]. There are also differences in OH PLIF signal intensity between the lower part and the upper part in the time-averaged images.…”

Section: Resultsmentioning

confidence: 90%

Investigation of Hydrogen Enriched Natural Gas Flames in a SGT-700/800 Burner Using OH PLIF and Chemiluminescence Imaging

Lantz

Collin

Aldén

et al. 2014

Journal of Engineering for Gas Turbines and Power

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The effect o f hydrogen enrichment to natural gas flames was experimentally investigated at atmospheric pressure conditions using flame chemiluminescence imaging, planar laser-induced fluorescence of hydroxyl radicals (OH PLIF), and dynamic pressure moni toring. The experiments were petformed using a third generation dry low emission (DLE) burner used in both SGT-700 and SGT-800 industrial gas turbines from Siemens. The burner was mounted in an atmospheric combustion test rig at Siemens with optical access in the flame region. Four different hydrogen enriched natural gas flames were investi gated; 0 vol. %, 30 vol. %, 60 vol. %, and 80 vol. % of hydrogen. The results from flame chemiluminescence imaging and OH PLIF show that the size and shape of the flame was clearly affected by hydrogen addition. The flame becomes shorter and narrower when the amount of hydrogen is increased. For the 60 vol. % and 80 vol. % hydrogen flames the flame has moved upstream and the central recirculation zone that anchors the flame has moved upstream the burner exit. Furthermore, the position of the flame front fluctuated more for the full premixed flame with only natural gas as fuel than for the hydrogen enriched flames. Measurements of pressure drop over the burner show an increase with increased hydrogen in the natural gas despite same airflow thus confirming the observa tion that the flame front moves upstream toward the burner exit and thereby increasing the blockage of the exit. Dynamic pressure measurements in the combustion chamber wall confirms that small amounts of hydrogen in natural gas changes the amplitude of the dynamic pressure fluctuations and initially dampens the axial mode but at higher levels of hydrogen an enhancement of a transversal mode in the combustion chamber at higher frequencies could occur.

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Section: Resultsmentioning

confidence: 90%

Investigation of Hydrogen Enriched Natural Gas Flames in a SGT-700/800 Burner Using OH PLIF and Chemiluminescence Imaging

Lantz

Collin

Aldén

et al. 2014

Journal of Engineering for Gas Turbines and Power

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“…Based on CH 4 oxidation reaction mechanism (Bone, 1932;Newitt and Szego, 1934;Minkoff and Tipper, 1962;Coffee, 1984), it shows that CH 4 oxidation reaction is done by a series of free radicals. During the gas explosion, the intermediate products, transient products, and free radicals, such as CO 2 , H 2 O, H, O, OH, CH 3 , and CHO were experimentally observed, so gas explosion reaction depends on the free radicals.…”

Section: Theoretical Analysis On Effect Of Electric Field On Gas Explmentioning

confidence: 99%

Experimental study and theoretical analysis on the effect of electric field on gas explosion and its propagation

Lin

Cong-guang

et al. 2011

J Coal Sci Eng China

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The effect of the electric field with different intensity on explosion wave pressure and flame propagation velocity of gas explosion was experimentally studied, and the effect of electric field on gas explosion and its propagation was theoretically analyzed from heat transportation, mass transportation, and reaction process of gas explosion. The results show that the electric field can affect gas explosion by enhancing explosion intensity and explosion pressure, thus increasing flame velocity. The electric field can offer energy to the gas explosion reaction; the effect of the electric field on gas explosion increases with the increase of electric field intensity. The electric field can increase mass transfer action, heat transfer action, convection effects, diffusion coefficient, and the reaction system entropy, which make the turbulence of gas explosion in electric field increase; therefore, the electric field can improve flame combustion velocity and flame propagation velocity, release more energy, increase shock wave energy, and then promote the gas explosion and its propagation.

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“…4 The mechanism used consists of 8 species and 17 reversible reactions. Last, we consider methane/al-flames, 5 with 20 species and 63 reversible reactions; however, the mechanism used here is different than that used in I and is more accurate tor rich flames.…”

Section: Flames To Be Consideredmentioning

confidence: 99%

The overall reaction concept in premixed, laminar, steady-state flames. II. Initial temperatures and pressures

Coffee¹,

Kotlar²,

Miller³

1984

Combustion and Flame

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Kinetic mechanisms for premixed, laminar, steady state methane/air flames

Cited by 62 publications

References 15 publications

Investigation of Hydrogen Enriched Natural Gas Flames in a SGT-700/800 Burner Using OH PLIF and Chemiluminescence Imaging

Investigation of Hydrogen Enriched Natural Gas Flames in a SGT-700/800 Burner Using OH PLIF and Chemiluminescence Imaging

Experimental study and theoretical analysis on the effect of electric field on gas explosion and its propagation

The overall reaction concept in premixed, laminar, steady-state flames. II. Initial temperatures and pressures

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