Self-acceleration of cellular flames and laminar flame speed of syngas/air mixtures at elevated pressures

Xie, Yongliang; Wang, Jinhua; Cai, Xiao; Huang, Zuohua

doi:10.1016/j.ijhydene.2016.07.239

Cited by 86 publications

(10 citation statements)

References 36 publications

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“…The critical Peclet number can be described as the critical radius normalized by the laminar flame thickness of the mixture [71]. The cellular critical radius is defined as the radius where the flame velocity increases significantly [72].…”

Section: Laminar Burning Characteristics Of Dmcmentioning

confidence: 99%

Dimethyl Carbonate as a Promising Oxygenated Fuel for Combustion: A Review

Abdalla

Liu

2018

Energies

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Energy shortage and environmental problems are two dominant subjects. Dimethyl carbonate (DMC) is one of the oxygenated fuels with increasing interest as the alternative to diesel fuel or additive for conventional hydrocarbon fuels. In the last decade, comprehensive studies on DMC have been carried out in terms of synthesis, use, and oxidation and combustion mechanism. DMC synthesis from greenhouse gas such as carbon dioxide can achieve the carbon circulation between air and fuel. Ethylene carbonate route is one of the most promising ways to utilize carbon dioxide and synthesize DMC in terms of particle efficiency, energy consumption per one unit of product, and net carbon dioxide emission. In addition, the results show that pure DMC in compression ignition (CI) engines or DMC addition in diesel/gasoline could decrease emissions significantly. Moreover, DMC pyrolysis form carbon dioxide before carbon monoxide which is different from other oxygenated fuels. However, DMC can produce formaldehyde during oxidation process in high concentration, which is harmful to the environment and human health as well. The present DMC kinetic model needs to update the major reactions constant through recognizing the initial decomposition routes and low-temperature oxidation. In addition, further studies on the DMC/hydrocarbon fuels mixtures for the interaction chemistry are needed.

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Section: Laminar Burning Characteristics Of Dmcmentioning

confidence: 99%

Dimethyl Carbonate as a Promising Oxygenated Fuel for Combustion: A Review

Abdalla

Liu

2018

Energies

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“…The values of u l show reduction by increasing the initial pressure for a specific equivalence ratio and hydrogen fraction. Xie et al 7 using spherical outwardly expanding flames investigated u l of CO/ H 2 /air mixtures at high pressures ranging from 4 to 6 bar. They performed their experiments with the H 2 fraction in the fuel changing from 0.2 to 0.8 and the equivalence ratios ranging from 0.5 to 1.0.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Investigation of the Laminar Burning Velocity and Combustion Characteristics of Biogas at High Pressures

2017

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Continuous variation in the composition of gaseous fuels derived from biomass is a challenge in designing efficient combustors for using them. In this study, experimental measurement of the laminar burning velocity (u l) of three different compositions of biogas fuel containing equimolar H2/CO mixtures and N2 ranging from 40 to 60% by volume is conducted. Numerical calculations of the flame structure, adiabatic flame temperature (T ad), species concentrations, and sensitivity analysis are also performed. Investigations are conducted over a practical range of equivalence ratios (ranging from 0.4 to 1.2) and at high pressures up to 4 bar. The experimental method of schlieren in a high-pressure combustion chamber is used for flame speed measurement. Numerical calculations are performed using the premixed code of CHEMKIN using four well-known reaction mechanisms. Laminar burning velocities calculated using the USC Mech Version II mechanism showed the best agreement with the experiments. The results indicated that the mole fraction of the H radical increases by equivalence ratio at the whole range considered in this study, while the OH radical declares its maximum concentration at stoichiometric conditions. This causes the maximum value of u l to occur at the equivalence ratio of 1.2. T ad increases by increasing pressure, especially near stoichiometric conditions and for lower N2-containing fuels. The equivalence ratio of the maximum flame temperature changes from the rich state (at φ = 1.05) to the stoichiometric state by increasing the N2 content of fuel from 40 to 60%. H2 plays a dominant role in the combustion of biogas fuel at high H2 concentration conditions. More than 50% of hydrogen burns before the flame front, while CO mainly burns after this position.

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“…The ame front becomes unstable under the action of instabilities such as diffusional/thermal instability or hydrodynamic instability, increasing the contact area between the ame surface and the unburned gas, which causes the ame to self-accelerate. [1][2][3][4][5][6] This self-acceleration effect can affect the entire ame combustion process and cause more serious damage. Therefore, it is of great practical signicance to limit the formation and growth of cellular ames in the initial stage of a methane/air explosion to reduce explosion hazards.…”

Section: Introductionmentioning

confidence: 99%

Synergistic inhibition effect on the self-acceleration characteristics in the initial stage of methane/air explosion by CO₂ and ultrafine water mist

et al. 2019

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Self-acceleration of cellular flames and laminar flame speed of syngas/air mixtures at elevated pressures

Cited by 86 publications

References 36 publications

Dimethyl Carbonate as a Promising Oxygenated Fuel for Combustion: A Review

Dimethyl Carbonate as a Promising Oxygenated Fuel for Combustion: A Review

Experimental and Numerical Investigation of the Laminar Burning Velocity and Combustion Characteristics of Biogas at High Pressures

Synergistic inhibition effect on the self-acceleration characteristics in the initial stage of methane/air explosion by CO₂ and ultrafine water mist

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Self-acceleration of cellular flames and laminar flame speed of syngas/air mixtures at elevated pressures

Cited by 86 publications

References 36 publications

Dimethyl Carbonate as a Promising Oxygenated Fuel for Combustion: A Review

Dimethyl Carbonate as a Promising Oxygenated Fuel for Combustion: A Review

Experimental and Numerical Investigation of the Laminar Burning Velocity and Combustion Characteristics of Biogas at High Pressures

Synergistic inhibition effect on the self-acceleration characteristics in the initial stage of methane/air explosion by CO2 and ultrafine water mist

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Synergistic inhibition effect on the self-acceleration characteristics in the initial stage of methane/air explosion by CO₂ and ultrafine water mist