Autoignition of Adiabatically Compressed Combustible Gas Mixtures

Hu, Haoran; Keck, James C.

doi:10.4271/872110

Cited by 146 publications

(52 citation statements)

References 15 publications

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“…The adiabatic core gas model [16] is based on the assumption of an adiabatic core zone, surrounded by a boundary zone that cools by heat transfer. Pressure is assumed homogeneous in the chamber, but not the temperature.…”

Section: Resultsmentioning

confidence: 99%

Ignition of isomers of pentane: An experimental and kinetic modeling study

Ribaucour

Minetti

Sochet

et al. 2000

Proceedings of the Combustion Institute

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Experiments in a rapid compression machine were used to examine the influences of variations in fuel molecular structure on the autoignition of isomers of pentane. Autoignition of stoichiometric mixtures of the three isomers of pentane were studied at compressed gas initial temperatures between 640 K and 900 K and at precompression pressures of 300 and 400 torr. Numerical simulations of the same experiments were carried out using a detailed chemical kinetic reaction mechanism. The results are interpreted in terms of a low-temperature oxidation mechanism involving addition of molecular oxygen to alkyl and hydroperoxyalkyl radicals. Results indicate that in most cases, the reactive gases experience a two-stage autoignition. The first stage follows a low-temperature alkylperoxy radical isomerization pathway that is effectively quenched when the temperature reaches a level where dissociation reactions of alkylperoxy and hydroperoxyalkylperoxy radicals are more rapid than the reverse addition steps. The second stage is controlled by the onset of dissociation of hydrogen peroxide. At the highest compression temperatures achieved, little or no first-stage ignition is observed. Particular attention is given to the influence of heat transfer and the importance of regions of variable temperature within the compressed gas volume. Implications of this work on practical ignition problems are discussed.

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Section: Resultsmentioning

confidence: 99%

Ignition of isomers of pentane: An experimental and kinetic modeling study

Ribaucour

Minetti

Sochet

et al. 2000

Proceedings of the Combustion Institute

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“…Most of these models assume that the chemical details of fuel autoignition are so complex that many simplifications are essential to be able to simulate the oxidation process. Some of the most prominent of these simplified model treatments of hydrocarbon ignition are the "Shell Model" [57] and related developments by Hu and Keck [58] and Cox and Cole [59]. A recent survey and critical analysis of these simplified approaches by Griffiths [60] has summarised the strengths and limitations of these models.…”

Section: Low Temperature Mechanismmentioning

confidence: 99%

A comprehensive modeling study of iso-octane oxidation

Curran

2002

Combustion and Flame

1,225

722

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A detailed chemical kinetic mechanism has been developed and used to study the oxidation of iso-octane in a jet-stirred reactor, flow reactors, shock tubes and in a motored engine. Over the series of experiments investigated, the initial pressure ranged from 1 to 45 atm, the temperature from 550 K to 1700 K, the equivalence ratio from 0.3 to 1.5, with nitrogen-argon dilution from 70% to 99%. This range of physical conditions, together with the measurements of ignition delay time and concentrations, provide a broad-ranging test of the chemical kinetic mechanism. This mechanism was based on our previous modeling of alkane combustion and, in particular, on our study of the oxidation of n-heptane. Experimental results of ignition behind reflected shock waves were used to develop and validate the predictive capability of the reaction mechanism at both low and high temperatures. Moreover, species' concentrations from flow reactors and a jet-stirred reactor were used to help complement and refine the low and intermediate temperature portions of the reaction mechanism, leading to good predictions of intermediate products in most cases. In addition, a sensitivity analysis was performed for each of the combustion environments in an attempt to identify the most important reactions under the relevant conditions of study.

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“…This last model was particularly well detailed for a reduced model, as it distinguished the different types of alkyl radicals and of isomerizations of peroxy radicals. The model of Hu and Keck [63] has been recently extended by Tanaka et al [64] to produce a model that included 32 species and 55 reactions with a good prediction of the major autoignition features of n-heptane, iso-octane and mixtures. The development of the older reduced models has greatly helped the writing of the below-described detailed kinetic models.…”

Section: 2a/ Mechanisms Written Without Computer Helpmentioning

confidence: 99%

“…Following this, progress was made in the development of a priori reduced mechanisms (to be distinguished from a posteriori reduced mechanisms obtained by reduction techniques from detailed mechanisms), including elementary steps, but involving globalized species (alkanes were represented by RH, all alkyl radicals by "R•", all peroxy radicals by "ROO•"…) such as the models of Cox and Cole [48], Hu and Keck [63] and the unified one of Griffiths et al [23]. This last model was particularly well detailed for a reduced model, as it distinguished the different types of alkyl radicals and of isomerizations of peroxy radicals.…”

Section: 2a/ Mechanisms Written Without Computer Helpmentioning

confidence: 99%