Probe Sampling Measurements and Modeling of Nitric Oxide Formation in Methane-Air Flames

Konnov, Alexander A.; Dyakov, Igor; Ruyck, Jacques De

doi:10.1080/00102200108907843

Cited by 52 publications

(50 citation statements)

References 18 publications

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“…In methane + air [3] and CH 4 + O 2 + N 2 mixtures with different dilution ratios D = O 2 /(O 2 + N 2 ) [4,5], the model slightly over-predicts NO concentrations in lean flames and slightly under-predicts these in rich flames; overall good agreement was observed. In C 2 H 4 + O 2 + N 2 flames with dilution ratios D = 0.15-0.18 [6], the measurements were found to be in good agreement with those of Fenimore [9].…”

Section: Introductionmentioning

confidence: 78%

“…In the following, the measurements of NO concentrations in the post-flame zone of different hydrocarbon + O 2 + N 2 flames at standard temperature and atmospheric pressure [3][4][5][6][7][8] are compared with the predictions of the original Konnov reaction mechanism [2] and with the same mechanism extended by the reaction of C 2 O with N 2 . One more modification was made: the thermodynamic data for C 2 O were updated to reflect the heat of formation, which is significantly higher (92.7 kcal/mole [11]) than the previously accepted value.…”

Section: Resultsmentioning

confidence: 99%

“…Probe sampling measurements of NO concentrations in the post-flame zone of different hydrocarbon + O 2 + N 2 flames at standard temperature and atmospheric pressure have been performed and compared with predictions of the Konnov reaction mechanism [3][4][5][6][7][8]. In methane + air [3] and CH 4 + O 2 + N 2 mixtures with different dilution ratios D = O 2 /(O 2 + N 2 ) [4,5], the model slightly over-predicts NO concentrations in lean flames and slightly under-predicts these in rich flames; overall good agreement was observed.…”

Section: Introductionmentioning

confidence: 99%

“…The goal of the present work was, therefore, to investigate a possible role of the re- action of C 2 O with N 2 through modeling of the experiments performed at atmospheric pressure [3][4][5][6][7][8] and implementing modifications proposed by Williams and Fleming [1].…”

Section: Introductionmentioning

confidence: 99%

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On the role of C2O radicals in the prompt-NO mechanism

Konnov

2008

Combust Explos Shock Waves

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The measurements of NO concentrations in the post-flame zone of different hydrocarbon + O 2 + N 2 flames at standard temperature and atmospheric pressure available in the literature are compared with predictions of the original Konnov reaction mechanism and with the same mechanism extended by the reaction of C 2 O with N 2 . The goal was to investigate the possible role of this reaction proposed by Williams and Fleming [P roc. Combust. Inst., Vol. 31 (2007), pp. 1109-1117]. This new reaction of C 2 O with N 2 seems to be a reasonable explanation of the deficiencies in the prompt-NO route. Direct comparisons of the experimental measurements performed in different flames with the modeling strongly suggests that the upper limit of this reaction rate constant is k = 7 · 10 11 exp(−17,000/RT ) [cm 3 /(mole · sec)].

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Section: Introductionmentioning

confidence: 78%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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On the role of C2O radicals in the prompt-NO mechanism

Konnov

2008

Combust Explos Shock Waves

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“…This installation has been described in detail previously [28,29] and has been used extensively for adiabatic stabilization of premixed flames and for measuring laminar burning velocity of different gaseous fuels. Adiabatic flames were stabilized using the heat flux method on a perforated plate burner at atmospheric pressure.…”

Section: Vub Flamesmentioning

confidence: 99%

An experimental and modeling study of propene oxidation. Part 2: Ignition delay time and flame speed measurements

Burke

Donagh

et al. 2015

Combustion and Flame

285

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Experimental data obtained in this study (Part II) complement the speciation data presented in Part I, but also offer a basis for extensive facility cross-comparisons for both experimental ignition delay time (IDT) and laminar flame speed (LFS) observables.To improve understanding of the ignition characteristics of propene, a series IDT experiments were performed in six different shock tubes and two rapid compression machines (RCMs) under conditions not previously studied. This study is the first of its kind to directly compare ignition in several different shock tubes over a wide range of conditions. For common nominal reaction conditions among these facilities, cross-comparison of shock tube IDTs suggests 20-30% reproducibility (2σ) for the IDT observable. The combination of shock tube and RCM data greatly expands the data available for validation of propene oxidation models to higher pressures (2-40 atm) and lower temperatures (750-1750 K).Propene flames were studied at pressures from 1-20 atm and unburned gas temperatures of 295-398 K for a range of equivalence ratios and dilutions in different facilities. The present propene-air LFS results at 1 atm were also compared to LFS measurements from the literature. With respect to initial reaction conditions, the present experimental LFS cross-comparison is not as comprehensive as the IDT comparison; however, it still suggests reproducibility limits for the LFS observable. For the LFS results, there was agreement between certain data sets and for certain equivalence ratios (mostly in the lean region), but the remaining discrepancies highlight the need to reduce uncertainties in laminar flame speed experiments amongst different groups and different methods. Moreover, this is the first study to investigate the burning rate characteristics of propene at elevated pressures (> 5 atm).IDT and LFS measurements are compared to predictions of the chemical kinetic mechanism presented in Part I and good agreement is observed.

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