Flame propagation mode transition of premixed syngas-air mixtures in a closed duct

Han, Shixin; Yu, Minggao; Yuan, Xufeng; Li, Haitao; Ma, Zimao

doi:10.1016/j.fuel.2022.123649

Cited by 17 publications

(3 citation statements)

References 56 publications

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“…The study of syngas mixtures and their application has a long history [17][18][19][20][21][22][23]. A brief overview of the use of syngas in engines is given in [17].…”

Section: Introductionmentioning

confidence: 99%

“…An increase in both the volume fraction of hydrogen and the aspect ratio of the duct led to an increase in the amplitude of the flame oscillations; the flame demonstrates stronger deformation and oscillations for the duct with a bigger aspect ratio. In the work [22], a premixed syngas-air flame propagating in a channel with a set of obstacles was investigated experimentally, focusing on the flame propagation mode's dependence on the hydrogen volume fraction. Three modes were identified: steady flame propagation, oscillating flame propagation, and end-gas autoignition.…”

Section: Introductionmentioning

confidence: 99%

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Mathematical Modeling of the Hydrodynamic Instability and Chemical Inhibition of Detonation Waves in a Syngas–Air Mixture

Nikitin,

Mikhalchenko,

Stamov

et al. 2023

Mathematics

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This paper presents the results of the two-dimensional modeling of the hydrodynamic instability of a detonation wave, which results in the formation of an oscillating cellular structure on the wave front. This cellular structure of the wave, unstable due to its origin, demonstrates the constant statistically averaged characteristics of the cell size. The suppression of detonation propagation in synthesis gas mixtures with air using a combustible inhibitor is studied numerically. Contrary to the majority of inhibitors being either inert substances, which do not take part in the chemical reaction, or take part in chemical reaction but do not contribute to energy release, the suggested inhibitor is also a fuel, which enters into an exothermic reaction with oxygen. The unsaturated hydrocarbon propylene additive is used as an inhibitor. The dependence of the effect of the inhibitor content on the mitigation of detonation for various conditions of detonation initiation is researched. The results make it possible to determine a critical percentage of inhibitor which prevents the occurrence of detonation and the critical percentage of inhibitor which destroys a developed detonation wave.

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“…The study of syngas mixtures and their application has a long history [17][18][19][20][21][22][23]. A brief overview of the use of syngas in engines is given in [17].…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Mathematical Modeling of the Hydrodynamic Instability and Chemical Inhibition of Detonation Waves in a Syngas–Air Mixture

Nikitin,

Mikhalchenko,

Stamov

et al. 2023

Mathematics

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show abstract

“…Li et al [29] suggested that the overpressure explosion might stimulate the flame propagation and accelerate the flame propagation again, but the vortex caused by the obstacles can make the flame propagation unsteady [4]. The explosion overpressure, however, can also cause the flame to oscillate [30]. Luo et al [31] found by conducting a numerical simulation that that flame front tip instability was related to the length of the obstacle, and the longer the obstacle, the faster the explosive overpressure and flame propagation speed in the tube.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Premixed Methane–Air Explosion in a Closed Tube with U-Type Obstacles

et al. 2022

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Given the spatial structures and functional requirements, there are a number of different types of obstacles in long and narrow confined spaces that will cause a premixed gas explosion to produce greater overpressure and influence the flame behavior for different obstacles. Because the volume fraction of unburned gas changes with the changing height of the U-type obstacles, we can further study the influence on the volume fraction of the unburned premixed gas for the characteristics of the overpressure and the flame behaviors in the closed tube with the obstacles. The results show that after the premixed gas is successfully ignited in the pipe, the overpressure in the pipe greatly increases as the unburned premixed gas burns between the adjacent plates. Moreover, the increase of the overpressure in the closed duct becomes faster when the decrease of unburned gas becomes faster. The high-pressure areas between the plates move inversely compared with the direction of flame propagation when the height of the U-type increases, whereas the high pressure in the front of the flame moves further when the flame propagation passes all obstacles. In addition, the reversed flow structure of the flame is a coupling result for the overpressure caused by the flame propagation and the vortex between the plates. From the perspective of production safety, this study is a significant basic subject about the characteristics of overpressure and flame behaviors in a closed tube with obstacles.

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Effect of hydrogen addition on explosion characteristics of premixed methane/air mixture under different equivalence ratio distributions

Liu

Wang

Zheng

et al. 2023

Energy

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Flame propagation mode transition of premixed syngas-air mixtures in a closed duct

Cited by 17 publications

References 56 publications

Mathematical Modeling of the Hydrodynamic Instability and Chemical Inhibition of Detonation Waves in a Syngas–Air Mixture

Mathematical Modeling of the Hydrodynamic Instability and Chemical Inhibition of Detonation Waves in a Syngas–Air Mixture

Numerical Simulation of Premixed Methane–Air Explosion in a Closed Tube with U-Type Obstacles

Effect of hydrogen addition on explosion characteristics of premixed methane/air mixture under different equivalence ratio distributions

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