An experimental and kinetic modeling study of a premixed nitromethane flame at low pressure

Tian, Zhen‐Yu; Zhang, Lidong D.; Li, Yuyang Y.; Yuan, Tao; Qi, Fei

doi:10.1016/j.proci.2008.06.098

Cited by 82 publications

(51 citation statements)

References 34 publications

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“…While literature photoionization cross-sections of most species identified in this experiment are available [31][32][33][34][35][36], only few are available for nitrogenous intermediates. Thus an estimated value of 10 Mb was used when the photon energy was 0-0.95 eV higher than their respective IEs; and 20 Mb was used when the photon energy was 1-2 eV higher than the IEs [12]. The uncertainties of the mole fractions are 5-10% for major species, 25% for intermediates with known photoionization cross-sections, a factor of 2 for those with estimated photoionization cross-sections, and even larger for radicals due to their quenching effect on the probe surface [37].…”

Section: Resultsmentioning

confidence: 99%

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An experimental and kinetic modeling study of premixed nitromethane flames at low pressure

Zhang

Yuan

et al. 2011

Proceedings of the Combustion Institute

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An experimental and modeling study is reported on three premixed nitromethane/oxygen/argon flames at low pressure (4.655 kPa) with equivalence ratios (/) of 1.0, 1.5 and 2.0. Flame species were identified with tunable synchrotron vacuum ultraviolet photoionization. The mole fraction profiles of more than 30 species including intermediates and radicals were obtained by near-threshold burner scan with selected photon energies. With a Pt-6%Rh/Pt-30%Rh thermocouple, the flame temperature profiles were measured. A detailed kinetic mechanism with 88 species and 701 reactions was proposed and validated against experimental results of all three flames. The computed predictions showed satisfactory agreement with the experimental results. Based on a rate-of-production analysis, reaction pathway diagrams were obtained to describe the hydrocarbon oxidation process and nitrogenous species chemistry in the nitromethane flame with / = 1.5.

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Section: Resultsmentioning

confidence: 99%

“…Tian et al performed an experiment on a premixed CH 3 NO 2 /O 2 /Ar flame at low pressure [12]. A mechanism developed from previous models of nitromethane decomposition [9] and nitromethane flame [3] involving 69 species and 314 reactions was proposed.…”

Section: Introductionmentioning

confidence: 99%

An experimental and kinetic modeling study of premixed nitromethane flames at low pressure

Zhang

Yuan

et al. 2011

Proceedings of the Combustion Institute

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“…In such cases, the knowledge of the characteristics of the ignition and explosion of gaseous nitromethane is an important basis of accident prevention. In earlier time, Tricot et al [12,13] studied the reaction of nitromethane with oxygen, and Hsu et al [14] suggested a detailed chemical mechanism describing the ignition of hightemperature gaseous nitromethane. It has been found that the ignition characteristics of flammable gases [15][16][17][18] explosion performances [19,20] bear close relationship with their concentrations.…”

Section: Introductionmentioning

confidence: 99%

Influence of nitromethane concentration on ignition energy and explosion parameters in gaseous nitromethane/air mixtures

Zhang

Lin

et al. 2011

Journal of Hazardous Materials

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“…Detailed chemistry mechanisms of Miller (Miller et al, 1983), Lindstedt (Lindstedt et al, 1994), Tian (Tian et al, 2009) and GRI-Mech 3.0 (Smith et al, 2000) were used. As those mechanisms were not specifically developed for NH3/air combustion, and in order to speed up the calculation, species including carbon atoms and the associated elementary reactions were removed from Miller's, Lindstedt's and Tian's mechanisms, keeping only species and elementary reactions including nitrogen, hydrogen and oxygen atoms.…”

Section: Methodsmentioning

confidence: 99%

“…It can be seen from this figure that the extinction stretch rate, εext, of NH3 flame is low, with a maximum around 100 s -1 for φ = 0.95. The numerical results are also plotted for the detailed mechanisms of Miller (Miller et al, 1983), Lindstedt (Lindstedt et al, 1994), Tian (Tian et al, 2009) and GRI-Mech 3.0 (Smith et al, 2000). Numerical results show the same variations in terms of the effect of equivalence ratio; however the magnitude of εext varies extensively depending on the reaction mechanism.…”

Section: Extinction Stretch Ratementioning

confidence: 99%

Extinction characteristics of ammonia/air counterflow premixed flames at various pressures

Colson

Hayakawa

Kudo

et al. 2016

JTST

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Ammonia has promising features as a carbon-free fuel without greenhouse gas emission. However, due to its low combustion intensity, the combustion characteristics of ammonia have been rarely investigated. The design of ammonia based industrial applications requires the development of effective turbulent ammonia combustion models. Thus, a study of the flame stretch effect in ammonia/air premixed combustion is necessary. The objective of this research was to study the ammonia flame extinction stretch rate both experimentally and numerically and to investigate the effects of pressure on its extinction characteristics. Experiments were conducted using a counterflow flame burner. Numerical simulations were run on CHEMKIN-PRO, using the PREMIX opposedflow model, for various detailed chemistry mechanisms. The effects of pressure on the extinction stretch rate of ammonia/air premixed flame were compared with that of methane/air flame, and the effects of pressure on the detailed reaction paths were clarified. It was found that the extinction stretch rate of ammonia/air flame is low compared with that of methane/air flame, as could be expected from its low laminar burning velocity. However, the increase of extinction stretch rate with pressure was found to be greater in the case of ammonia/air flame. From detailed chemistry analysis, it was found that the different dependence on pressure of the reaction path of the two fuels could explain this difference. Indeed, the heat release process and flame strength are affected by a greater dependence on pressure of the reactions contributing the most to heat released in the case of methane/air flame. For methane/air flame, CH3 is consumed in the main heat releasing reactions, and they experience competition by the third body recombination, 2CH3+M⇋C2H6+M at high pressure. In the case of ammonia/air flame, the heat release process is mainly related to NH3+OH ⇋ NH2+H2O, NH2+OH ⇋ NH+H2O and NH2+NO⇋N2+H2O, which remain preponderant when pressure increases. Thus, the decrease of characteristic reaction time with pressure was found to be greater in the case of ammonia/air flame, explaining a larger increase in extinction stretch rate when pressure increases.

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An experimental and kinetic modeling study of a premixed nitromethane flame at low pressure

Cited by 82 publications

References 34 publications

An experimental and kinetic modeling study of premixed nitromethane flames at low pressure

An experimental and kinetic modeling study of premixed nitromethane flames at low pressure

Influence of nitromethane concentration on ignition energy and explosion parameters in gaseous nitromethane/air mixtures

Extinction characteristics of ammonia/air counterflow premixed flames at various pressures

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