Experimental and numerical study of the effect of initial temperature on the combustion characteristics of premixed syngas/air flame

Xu, Zhuangzhuang; Deng, Haoxin; Wei, Shengnan; Yan, Mengmeng; Wen, Xiaoping; Wang, Fahui; Chen, Guoyan

doi:10.1016/j.ijhydene.2022.11.025

Cited by 11 publications

(4 citation statements)

References 46 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%

“…Simultaneously, the maximum excess pressure increases, and the time to reach the maximum pressure decreases. In the work [20], the effect of different initial temperatures and volume fractions of hydrogen on the combustion characteristics of premixed syngas/air flames in rectangular tubes was experimentally investigated. It was found that the flame propagation velocity increases with the increase of the initial temperature before the flame touches the wall, while after it touches the wall, the opposite happens.…”

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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“…To the authors’ knowledge, the theoretical model developed by Valiev et al is the most recent theoretical model that seeks to characterize the acceleration of deflagrations in the initial stages of their propagation inside ducts (or tubes). The vast majority of experimental studies available in the literature ,− ,− focusing on the flame front inversion phenomenon inside closed (or half-open) ducts have not compared their experimental results with the analytical model of Valiev et al Likewise, the effect of Le and Ze numbers in the early stages of flame propagation inside closed ducts has not been considered to evaluate the model by Valiev et al…”

Section: Introductionmentioning

confidence: 99%

Experimental and Theoretical Analyses of Deflagrations of Mixtures Involving Hydrogen Enrichment and Helium Dilution Inside a Closed Duct

Quines da Silva,

Lauermann,

Nzinga

et al. 2023

Energy Fuels

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The aim of the present work is to analyze experimentally and theoretically the deflagrations in a closed duct of mixtures in which natural gas is enriched with hydrogen or diluted with helium. In the first case, hydrogen would increase the flame propagation velocity, while in the second case, helium should make the mixture less reactive. The characterization of these mixtures is carried out with the help of Lewis (Le) and Zeldovich (Ze) numbers. Therefore, eight mixtures were considered. These mixtures covered a Le interval from 0.60 to 1.36 and a Ze interval from 4.24 to 8.45. Moreover, the mixtures involved species such as natural gas, hydrogen, helium, and air. It was observed that higher dimensionless flame tip velocities were obtained for mixtures with Le below unity. For mixtures with similar Le numbers, it was observed that lower Ze numbers produced higher velocities. A theoretical model available in the literature was applied and compared with the experimental data obtained in the present work for the dimensionless flame speed. It was noticed that the model presented greater discrepancies for mixtures with Le different from unity. The model was also applied to predict the evolution of the dimensionless flame tip position and was compared with published experimental data. Inaccuracies were observed for this comparison. In addition, two possible modifications of the existing theoretical model for determining the evolution of the dimensionless flame tip position are presented and validated in this paper. One of them showed good accuracy.

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“…It is spoken that this way in concert with EGR method allows to improve the engine efficiency (by up to 5%) and reduce CO emissions (by up to 10%). The results by Z. Xu et al [10] are proposed that the increase in initial temperature of premixed syngas/air flames leads to the increase in the laminar burning velocity and adiabatic flame temperature. In [11] authors considered how intake air temperature (40 ℃ and 60 ℃) influence on combustion characteristics od diesel engine.…”

Section: Introductionmentioning

confidence: 99%

Combustion of liquid hydrocarbons sprayed by air jet

Mukhina,

Kopyev,

Shadrin

2023

E3S Web Conf.

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In the present work, the combustion of liquid hydrocarbons sprayed by air jet was studied using diesel fuel as an example. The dependences of nitrogen oxides and carbon monoxide concentrations in combustion products on the fuel and air flow rates were investigated using an atmospheric burner device. It is shown that while diesel fuel sprayed by air jet there is a wider range of operating parameters in comparison with steam spraying due to the flameout. Compared with atomization by air jet at room temperature, steam and heated air spraying have advantages, for these regimes the NOx concentrations are observed to be lower.

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Experimental and numerical study of the effect of initial temperature on the combustion characteristics of premixed syngas/air flame

Cited by 11 publications

References 46 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

Experimental and Theoretical Analyses of Deflagrations of Mixtures Involving Hydrogen Enrichment and Helium Dilution Inside a Closed Duct

Combustion of liquid hydrocarbons sprayed by air jet

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