Ignition of acetylene-oxygen mixtures behind shock waves

Tereza, А. М.; Slutskii, V. G.; Severin, E. S.

doi:10.1134/s1990793109010163

Cited by 14 publications

(6 citation statements)

References 41 publications

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“…The same trend is seen in Fig. , which presents ignition delay times of C 2 H 2 /O 2 /Ar measured by Tereza et al at 6.5 bar. Both sets of experiments show that ignition delays are shorter under fuel‐rich conditions, compared to stoichiometric and fuel‐lean conditions.…”

Section: Resultssupporting

confidence: 85%

“…Ignition delay times of C 2 H 2 at 6.5 bar under fuel‐rich (Φ = 3, 20.3% C 2 H 2 + 16.7%O 2 in Ar), stoichiometric (Φ = 1, 7.75% C 2 H 2 + 19.38%O 2 in AR), and fuel‐lean (Φ = 0.3, 2.27% C 2 H 2 + 20.4%O 2 in AR) conditions. Symbols mark experimental results taken from Tereza et al , whereas lines denote modeling predictions. The ignition delay time was defined by the maximum temperature gradient.…”

Section: Resultsmentioning

confidence: 99%

“…Comprehensive modeling studies of acetylene oxidation have been published by Tan et al and by Lindstedt and Skevis . Even though these studies cover a fairly wide range of stoichiometries and temperatures, results for the low‐to‐medium temperature oxidation chemistry of acetylene is limited to the early static reactor work , and the few experiments conducted at increased pressure are limited to pressures up to 20 bar.…”

Section: Introductionmentioning

confidence: 99%

“…Acetylene (C 2 H 2 ) is an important intermediate in combustion of hydrocarbons and a precursor of PAH and soot. Previous studies of C 2 H 2 oxidation have been conducted in static reactors , jet‐stirred reactors , flow reactors , shock tubes , and premixed laminar flames . Comprehensive modeling studies of acetylene oxidation have been published by Tan et al and by Lindstedt and Skevis .…”

Section: Introductionmentioning

confidence: 99%

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Experimental and Kinetic Modeling Study of C₂H₂ Oxidation at High Pressure

Giménez-López

Rasmussen

Hashemi

et al. 2016

Int J of Chemical Kinetics

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A detailed chemical kinetic model for oxidation of C 2 H 4 in the intermediate temperature range and high pressure has been developed and validated experimentally. New ab initio calculations and RRKM analysis of the important C 2 H 3 + O 2 reaction was was used to obtain rate coefficients over a wide range of conditions (0.003-100 bar, 200-3000 K). The results indicate that at 60 bar vinyl peroxide, rather than CH 2 O and HCO, is the dominant product.The experiments, involving C 2 H 4 /O 2 mixtures diluted in N 2 , were carried out in a high pressure flow reactor at 600-900 K and 60 bar, varying the reaction stoichiometry from very lean to fuel-rich conditions. Model predictions are generally satisfactory. The governing reaction mechanisms are outlined based on calculations with the kinetic model. Under the investigated conditions the oxidation pathways for C 2 H 4 are more complex than those prevailing at higher temperatures and lower pressures. The major differences are the importance of the hydroxyethyl (CH 2 CH 2 OH) and 2-hydroperoxyethyl 1 (CH 2 CH 2 OOH) radicals, formed from addition of OH and HO 2 to C 2 H 4 , and vinyl peroxide, formed from C 2 H 3 + O 2 . Hydroxyethyl is oxidized through the peroxide HOCH 2 CH 2 OO (lean conditions) or through ethenol (low O 2 concentration), while 2-hydroperoxyethyl is converted through oxirane. [2][3][4][5][6][7], shock tubes [8][9][10][11][12] and premixed laminar flames [13][14][15][16][17], covering a wide range of stoichiometries and temperatures. Most of the reported work, however, have been carried out at near atmospheric pressure. A few results are available from flow reactor studies at 5-10 bar [6], but despite their relevance for the chemistry in engines, gas turbines, and gas-to-liquid processes, data at high pressures are limited.The objective of the present study is to obtain experimental results for the oxidation of C 2 H 4 at high pressure (60 bar) as functions of temperature (600-900 K) and stoichiometry (lean to fuel-rich) and analyze them in terms of a detailed chemical kinetic model. The oxidation pathways for C 2 H 4 under these conditions are different from those prevailing at higher temperatures and lower pressures and the results of the current work help to extend the validation range for chemical kinetic modeling of C 2 H 4 oxidation. This paper is part of a series investigating the high-pressure, medium temperature oxidation of simple fuels: previously work has been reported for CO/H 2 , CH 4 , and CH 4 /C 2 H 6 mixtures [18,19]. The present kinetic model draws on this work, as well as recent results in tropospheric chemistry. Furthermore, the important reaction of C 2 H 3 with O 2 was characterized from ab initio calculations over a wide range of pressure and temperature. 3 ExperimentalThe experimental setup is a laboratory-scale high pressure laminar flow reactor designed to approximate plug-flow. The setup is described in detail elsewhere [18] and only a brief description is provided here. The system enables well-defined investigations of...

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Section: Resultssupporting

confidence: 85%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Experimental and Kinetic Modeling Study of C₂H₂ Oxidation at High Pressure

Giménez-López

Rasmussen

Hashemi

et al. 2016

Int J of Chemical Kinetics

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“…Published by Elsevier Inc. All rights reserved. [2][3][4][5] , and few experiments have been conducted at increased pressure [6][7][8][9] . In particular, there is little knowledge about the interaction of acetylene with nitrogen oxides.…”

Section: Introductionmentioning

confidence: 99%

The C2H2 + NO2 reaction: Implications for high pressure oxidation of C2H2/NOx mixtures

Marshall,

Leung,

Gimenez-Lopez

et al. 2019

Proceedings of the Combustion Institute

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The reaction of C 2 H 2 with NO 2 has been studied theoretically. It is a complex overall reaction with multiple wells and multiple product channels. The calculated rate constant for the preferred channel, formation of a CHOCHON adduct, is compatible with the only experimental determination. The CHOCHON adduct is assumed to dissociate rapidly to form the triplet carbene CHCHO and NO. An experimental and kinetic modeling study of the interaction between C 2 H 2 , O 2 and NO x was performed under flow reactor conditions in the intermediate temperature range (600-900 K), high pressure (50-60 bar), and for stoichiometries ranging from reducing to strongly oxidizing. The results show that presence of NO x serves both to sensitize and inhibit oxidation of C 2 H 2. Calculations with a detailed chemical kinetic model, partly established in the present work, confirm that C 2 H 2 + NO 2 is the major initiation step, as well as the major sensitizing reaction. This reaction converts NO 2 to NO, which is then partly converted to HCN by reaction with C 2 H 3 and CHCHOH. The latter reactions are both chain terminating and serve as the major inhibiting steps.

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Acceleration of the Flame in a Smooth Channel and Detonation Transition

Kiverin,

Krivosheyev,

Novitskii

et al. 2023

J Eng Phys Thermophy

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Ignition of acetylene-oxygen mixtures behind shock waves

Cited by 14 publications

References 41 publications

Experimental and Kinetic Modeling Study of C₂H₂ Oxidation at High Pressure

Experimental and Kinetic Modeling Study of C₂H₂ Oxidation at High Pressure

The C2H2 + NO2 reaction: Implications for high pressure oxidation of C2H2/NOx mixtures

Acceleration of the Flame in a Smooth Channel and Detonation Transition

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Ignition of acetylene-oxygen mixtures behind shock waves

Cited by 14 publications

References 41 publications

Experimental and Kinetic Modeling Study of C2H2 Oxidation at High Pressure

Experimental and Kinetic Modeling Study of C2H2 Oxidation at High Pressure

The C2H2 + NO2 reaction: Implications for high pressure oxidation of C2H2/NOx mixtures

Acceleration of the Flame in a Smooth Channel and Detonation Transition

Contact Info

Product

Resources

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Experimental and Kinetic Modeling Study of C₂H₂ Oxidation at High Pressure

Experimental and Kinetic Modeling Study of C₂H₂ Oxidation at High Pressure