Effect of pressure and equivalence ratio on the ignition characteristics of dimethyl ether-hydrogen mixtures

Pan, Lun; Hu, Erjiang; Deng, Fuquan; Zhang, Zihang; Huang, Zuohua

doi:10.1016/j.ijhydene.2014.09.098

Cited by 39 publications

(23 citation statements)

References 49 publications

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“…This study suggested that the mechanism of Li et al [6] is best applicable for the prediction of H 2 /O 2 combustion. However, this finding is incongruous with the studies made by Pan et al [19,20] which indicated that the mechanism of Li et al [6] over-predicted ignition delay times at the high pressure (p ¼ 10 atm). It is noted that the ignition delay times validated against in Str€ ohle et al [10] are from different sources, which may influenced the comparison results due to different experimental facilities and definitions of ignition delay time.…”

Section: Introductioncontrasting

confidence: 70%

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Shock tube study on ignition delay of hydrogen and evaluation of various kinetic models

Pan

Gao

et al. 2016

International Journal of Hydrogen Energy

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Section: Introductioncontrasting

confidence: 70%

“…Definition of sensitivity analysis parameter can be found in numerous studies [19,20] and given as follow:…”

Section: Poor Performance Model Improvementmentioning

confidence: 99%

Shock tube study on ignition delay of hydrogen and evaluation of various kinetic models

Pan

Gao

et al. 2016

International Journal of Hydrogen Energy

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“…While one-step models allow to reproduce the laminar flame speed U L and the adiabatic flame temperature T b with satisfactory good accuracy, the induction times predicted by the one-step models are significantly shorter than the induction times calculated using detailed chemical models, GRI 3.0 Mech, and the experimentally measured induction times. induction times computed with the detailed chemical model [20] and experimental results [25,26,[29][30][31].…”

Section: Comparison Of One-step and Detailed Chemical Schemes; Inductmentioning

confidence: 99%

“…Experimental data are: -Hu et al[28]; • -Wang et al[30]. InFigure 2(b) experimental data are: -Hu et al[30]; • -Pan et al[31].…”

mentioning

confidence: 99%

Influence of chemical kinetics on spontaneous waves and detonation initiation in highly reactive and low reactive mixtures

Liberman

Wang

Qian

et al. 2018

Combustion Theory and Modelling

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Understanding the mechanisms of explosions is important for minimizing devastating hazards. Due to the complexity of real chemistry, a single-step reaction mechanism is usually used for theoretical and numerical studies. The purpose of this study is to look more deeply into the influence of chemistry on detonation initiated by a spontaneous wave. Results of high resolution simulations performed for one-step models are compared with simulations for detailed chemical models for highly reactive and low reactive mixtures. The calculated induction times for H2/air and for CH4/air are validated against experimental measurements for a wide range of temperatures and pressures. It is found that the requirements in terms of temperature and size of the hot spots, which produce a spontaneous wave capable to initiate detonation, are quantitatively and qualitatively different for one-step models compared to the detailed chemical models. The time and locations when the exothermic reaction affects the coupling between the pressure wave and spontaneous wave are considerably different for a one-step and detailed models. The temperature gradients capable to produce a detonation and the corresponding size of hot spots are much shallower and, correspondingly, larger than those predicted with one-step models. The impact of detailed chemical model is particularly pronounced for the methane-air mixture. In this case, not only the hot spot size is much greater than that predicted by a one-step model, but even at elevated pressure the initiation of detonation by a temperature gradient is possible only if the temperature outside the gradient is so high, that can ignite thermal explosion. The obtained results suggest that the one-step models do not reproduce correctly the transient and ignition processes, so that interpretation of the simulations performed using a one-step model for understanding mechanisms of flame acceleration, DDT and the origin of explosions must be considered with great caution.

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“…In addition, because of differences between cycles, it is difficult to investigate the chemical characteristics of the fuel itself. To address these problems, various experimental devices including shock-tubes [12,13], rapid compression machines (RCMs) [14,15], and jet-stirred flow reactors [16] have been investigated to simulate the combustion phenomena in the cylinder of internal combustion engines. Among these devices, the RCM is particularly suitable for measurements of the global parameters, including the ignition delay at low to intermediate temperatures.…”

Section: Introductionmentioning

confidence: 99%

The effects of hydrogen addition on the auto-ignition delay of homogeneous primary reference fuel/air mixtures in a rapid compression machine

Chung²,

Lee

et al. 2015

International Journal of Hydrogen Energy

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Effect of pressure and equivalence ratio on the ignition characteristics of dimethyl ether-hydrogen mixtures

Cited by 39 publications

References 49 publications

Shock tube study on ignition delay of hydrogen and evaluation of various kinetic models

Shock tube study on ignition delay of hydrogen and evaluation of various kinetic models

Influence of chemical kinetics on spontaneous waves and detonation initiation in highly reactive and low reactive mixtures

The effects of hydrogen addition on the auto-ignition delay of homogeneous primary reference fuel/air mixtures in a rapid compression machine

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