Hydrogen–oxygen reactions behind shock waves assisted by OH(2Σ+) formation

Skrebkov, O. V.; Karkach, S. P.; Vasil'ev, V. M.; Smirnov, A. L.

doi:10.1016/s0009-2614(03)00875-3

Cited by 17 publications

(32 citation statements)

References 9 publications

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“…OH * formation was experimentally studied in various H 2 /O 2 systems [9][10][11][12][13][14]. Theoretical investigations [15][16][17] of the formation pathways were done by ab-initio analysis by Skrebkov et al [15,16] and Smekhov et al [17]. More recently, Kopp et al [18] investigated the OH * chemiluminescence in various shock-heated H 2 /O 2 mixtures for technical relevant pressures up to 32 bar.…”

Section: Kinetics Of Electronically Excited Speciesmentioning

confidence: 99%

Investigation of the kinetics of OH∗ and CH∗ chemiluminescence in hydrocarbon oxidation behind reflected shock waves

2012

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The temporal variation of chemiluminescence emission from OH * (A 2 Σ + ) and CH * (A 2 Δ) in reacting Ar-diluted H 2 /O 2 /CH 4 , C 2 H 2 /O 2 and C 2 H 2 /N 2 O mixtures was studied in a shock tube for a wide temperature range at atmospheric pressures and various equivalence ratios. Time-resolved emission measurements were used to evaluate the relative importance of different reaction pathways. The main formation channel for OH * in hydrocarbon combustion was studied with CH 4 as benchmark fuel. Three reaction pathways leading to CH * were studied with C 2 H 2 as fuel. Based on well-validated groundstate chemistry models from literature, sub-mechanisms for OH * and CH * were developed. For the main OH * -forming reaction CH + O 2 = OH * + CO, a rate coefficient of k 2 = (8.0 ± 2.6) × 10 10 cm 3 mol −1 s −1 was determined. For CH * formation, best agreement was achieved when incorporating reactions C 2 + OH = CH * + CO (k 5 = 2.0 × 10 14 cm 3 mol −1 s −1 ) and C 2 H + O = CH * + CO (k 6 = 3.6 × 10 12 exp(−10.9 kJ mol −1 /RT) cm 3 mol −1 s −1 ) and neglecting the C 2 H + O 2 = CH * + CO 2 reaction.

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Section: Kinetics Of Electronically Excited Speciesmentioning

confidence: 99%

Investigation of the kinetics of OH∗ and CH∗ chemiluminescence in hydrocarbon oxidation behind reflected shock waves

2012

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“…The models of chemical kinetics of hydrogen combustion [3][4][5] are compared with the experimental data of [6][7][8][9][10]. The test conditions and the criteria for determining t ign are summarized in Table 1.…”

Section: Comparison Of Results Computed By Different Models Of Chemicmentioning

confidence: 99%

“…Luminescence of OH * radical ions at temperatures 1000 < T < 2500 K and pressures 0.3 < p 1 < 2 atm during ignition and combustion of hydrogen behind the SW in a mixture of H 2 , O 2 , and Ar was measured in [10] (stoichiometric mixtures 2H 2 + O 2 were considered with 1.4-5.6% of 2H 2 + O 2 ). Experimental data on the time t * between the moment the SW passed through a certain point and the maximum signal of OH * radical luminescence at this point were also reported in that paper.…”

Section: Comparison Of Results Computed By Different Models Of Chemicmentioning

confidence: 99%

“…The computed results were also compared with the experimental data of [10]. The computations were performed for mixtures of argon with 1.4, 2.5, and 5.6% of 2H 2 + O 2 under conditions consistent with the experimental data: the pressure behind the SW was 0.3 < p 1 < 2 atm, and the temperature behind the SW was 1000-2200 K. To obtain the needed temperature behind the SW, the pressure in the low-pressure chamber ahead of the SW was varied in the experiments.…”

Section: Comparison Of Results Computed By Different Models Of Chemicmentioning

confidence: 99%

“…To choose a particular kinetic scheme and rate constants, however, it is desirable to make comparisons with experimental data from several sources and in terms of several parameters. Detailed kinetic schemes [3][4][5] are used for this purpose in the present work, and the computed results are compared with the experimental data of [6][7][8][9][10] on the ignition delay as a function of temperature. Ignition and combustion of hydrogen behind a shock wave in a H 2 -O 2 -Ar mixture containing 1-10% of H 2 -O 2 are computed for temperatures 800 < T < 2500 K and pressures 0.3 < p 1 < 5 atm.…”

Section: Introductionmentioning

confidence: 99%

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Comparative Analysis of Three Mathematical Models of Hydrogen Ignition

Бедарев

Федоров

2006

Combust Explos Shock Waves

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Three models of chemical kinetics of hydrogen combustion in oxygen and three gasdynamic models of the flow of a reacting mixture behind the front of an initiating shock wave are analyzed. The computed data are compared with experimental results in terms of the ignition delay versus temperature. It is demonstrated that the choice of the criterion determining the ignition delay for comparisons with experimental data is of major importance. A numerical analysis of three kinetic schemes of hydrogen ignition shows that a scheme with 38 reactions of 8 species offers the best description of experimental data in the range of temperatures from 1000 to 2800 K.

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Study of the H+O+M reaction forming OH∗: Kinetics of OH∗ chemiluminescence in hydrogen combustion systems

Kathrotia

Fikri

Bozkurt

et al. 2010

Combustion and Flame

125

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a b s t r a c tThe temporal variation of OH * (A 2 R + ) chemiluminescence in hydrogen oxidation chemistry has been studied in a shock tube behind reflected shock waves at temperatures of 1400-3300 K and at a pressure of 1 bar. The aim of the present work is to obtain a validated reaction scheme to describe OH * formation in the H 2 /O 2 system. Temporal OH * emission profiles and ignition delay times for lean and stoichiometric H 2 /O 2 mixtures diluted in 97-98% argon were obtained from the shock-tube experiments. Based on a literature review for the hydrogen combustion system, the key reaction considered was H + O + M = OH * + M (R1). The temperature dependence of the measured peak OH * emission from the shock tube and the peak OH * concentration from a homogeneous closed reactor model are compared. Based on these results a reaction rate coefficient of k 1 = (1.5 ± 0.4) Â 10 13 exp(À25 kJ mol À1 /RT) cm 6 mol À2 s À1 was found for the forward reaction (R1) which is slightly higher than the rate coefficient suggested by Hidaka et al. (1982). The comparison of measured and simulated absolute concentrations shows good agreement. Additionally, a one-dimensional laminar premixed low-pressure flame calculation was performed for where absolute OH * concentration measurements have been reported by Smith et al. (2005). The absolute peak OH * concentration is fairly well reproduced if the above mentioned rate coefficient is used in the simulation.

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Hydrogen–oxygen reactions behind shock waves assisted by OH(2Σ+) formation

Cited by 17 publications

References 9 publications

Investigation of the kinetics of OH∗ and CH∗ chemiluminescence in hydrocarbon oxidation behind reflected shock waves

Investigation of the kinetics of OH∗ and CH∗ chemiluminescence in hydrocarbon oxidation behind reflected shock waves

Comparative Analysis of Three Mathematical Models of Hydrogen Ignition

Study of the H+O+M reaction forming OH∗: Kinetics of OH∗ chemiluminescence in hydrogen combustion systems

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