Shock-tube investigations on the self-ignition of hydrocarbon-air mixtures at high pressures

Fieweger, K.; Blumenthal, Ralf; Adomeit, G.

doi:10.1016/s0082-0784(06)80803-9

Cited by 85 publications

(57 citation statements)

References 8 publications

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“…These data together with the model simulations are depicted in Fig 4. It is clear that, in the temperature range 600 to 675 K, the model simulation predicts more reactivity than observed experimentally, with more O 2 reacted and more CO, CO 2 , and H 2 O produced. We have not been able to gain better agreement as to do so would result in poorer agreement with the shock tube ignition-delay data of Fieweger et al [6,7], discussed below.…”

Section: Princeton Variable Pressure Flow Reactormentioning

confidence: 62%

“…Below, we describe how this mechanism was used to simulate experimental results obtained in an atmospheric pressure flow reactor [20], a variable pressure flow reactor [15,22] at 12.5 atm, and a complementarily different flow reactor [23]. Moreover, results obtained in a jet-stirred reactor [10], shock tubes [5][6][7], and in a motored engine [17] are also simulated. Overall, good agreement is obtained between model and experiment.…”

Section: Mechanism Validationmentioning

confidence: 99%

“…Our detailed chemical kinetic model has been used, assuming constant-volume, homogeneous, adiabatic conditions behind the reflected shock wave, to simulate the autoignition of iso-octane, at high temperatures studied by Vermeer et al [5] and at low temperatures as studied by Fieweger et al [6,7]. Vermeer et al studied the autoignition of iso-octane/oxygen/argon mixtures behind reflected shock waves in the pressure range of 1 to 4 atm and the temperature range of 1200 to 1700 K. Stoichiometric fueloxygen mixtures were diluted with 70% argon to reduce the influence of the boundary layer.…”

Section: Shock Tubementioning

confidence: 99%

“…Influence of equivalence ratio for iso-octane oxidation in a shock tube at 13 bar, ϭ 1.0 in air. Experimental (points) [6,7] and model predictions (lines). Dashed line corresponds to open symbols.…”

Section: Co-operative Fuels Research Enginementioning

confidence: 99%

“…Previous experimental studies of iso-octane oxidation have focused on shock tubes [5][6][7], jet-stirred reactors [8 -11], rapid compression machines [12][13][14][15][16], engines [17][18][19], flow reactors [20 -22] and [23], in which a dynamic behaviour is observed. All of these systems exhibit phenomena including self ignition, cool flame, and negative temperature coefficient (NTC) behavior.…”

Section: Introductionmentioning

confidence: 99%

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A comprehensive modeling study of iso-octane oxidation

Curran

2002

Combustion and Flame

1,235

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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Section: Princeton Variable Pressure Flow Reactormentioning

confidence: 62%

Section: Mechanism Validationmentioning

confidence: 99%

Section: Shock Tubementioning

confidence: 99%

Section: Co-operative Fuels Research Enginementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

A comprehensive modeling study of iso-octane oxidation

Curran

2002

Combustion and Flame

1,235

722

View full text Add to dashboard Cite

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Shock tube investigation of methyl tert butyl ether and methyl tetrahydrofuran high‐temperature kinetics

Jouzdani

Zheng

Zhou

et al. 2019

Int J of Chemical Kinetics

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The autoignition and pyrolysis of two C5 ethers, methyl tert butyl ether (MTBE) and 2‐methyltetrahydrofuran (2‐MTHF), are investigated using the shock tube reactor. The experiments are carried out at pressures of 3.5 and 12 atm at temperatures above 1000 K with argon as a diluent gas. By means of direct laser absorption, carbon monoxide time histories and associated chemical kinetic timescales are also determined. It is observed that the competition between ignition and pyrolysis times depends on the temperature and equivalence ratio of the ignition mixture, such that there is a temperature above which pyrolysis predominates oxidative kinetics. This crossover temperature shifts toward higher temperatures for reactive systems with a fixed fuel concentration but higher oxygen content. The resulting experimental observations are also compared with predictions of existing chemical kinetic models from the literature. The results point to differences in chemical reactivity, such that in pyrolysis conditions, the reactivity of the cyclic ether, 2‐MTHF, is generally higher than that of the aliphatic ether, MTBE. While agreement between experimental observations and model predictions is observed under certain conditions, significant variance between observations and predictions is observed under other conditions. With respect to prediction of the pyrolysis time used to capture the global kinetics of pyrolysis, it is observed that the relation of this time to the time needed to attain 90% of the equilibrium CO concentration varies greatly with the result that the models used in this work generally predict a faster initial formation of CO but a much slower approach to the equilibrium concentration. This is thought to arise from the slow transformation of intermediate CH2O and CH2CO to CO. The chemical kinetic models considered in this work are therefore not capable of predicting the CO time histories during pyrolysis.

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Chemical kinetic analysis on the auto‐ignition characteristics of natural gas–diesel dual‐fuel combustion under engine‐relevant conditions

Liu

Wang

Xie

et al. 2023

Int J of Chemical Kinetics

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With the advent of energy crisis and stringent emission regulations, natural gas (NG)/diesel dual‐fuel engines have entered the popular view. In this paper, the accurate boundary conditions are determined by the Converge model and the transient parameters were introduced into the chemical kinetics model to make the operating conditions more closely match the actual engine operating conditions. The effects of different methane/n‐heptane ratios, initial temperatures, initial pressures, and equivalence ratios on the IDT of methane/n‐heptane fuel mixtures were analyzed using comprehensive chemical kinetic tools such as mole fraction analysis, ROP analysis, and sensitivity analysis. The IDT of methane/n‐heptane mixture decreased significantly with increasing the equivalence ratio, initial pressure, and the proportion of n‐heptane in the mixture, but the change of temperature was more complicated for the IDT. The NTC behavior of methane/n‐heptane mixture was also affected by the NTC behavior of n‐heptane. With the increase of initial temperature, the consumption of methane and n‐heptane appeared to be significantly accelerated. The peak of radicals and intermediate groups appeared earliest and had the highest radical concentration when the n‐heptane content was 30%. With the increase of initial pressure, the peak moments of the six radicals were further advanced, but the mole concentrations of O, OH, H radicals decreased significantly. This paper not only provides a reference for the design of NG/diesel dual‐fuel engines, but also provides a theoretical basis and data support for improving the ignition and initial condition setting strategies of the engines.

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Shock-tube investigations on the self-ignition of hydrocarbon-air mixtures at high pressures

Cited by 85 publications

References 8 publications

A comprehensive modeling study of iso-octane oxidation

A comprehensive modeling study of iso-octane oxidation

Shock tube investigation of methyl tert butyl ether and methyl tetrahydrofuran high‐temperature kinetics

Chemical kinetic analysis on the auto‐ignition characteristics of natural gas–diesel dual‐fuel combustion under engine‐relevant conditions

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