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学者姓名:王金华

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Flame morphology and self-acceleration of syngas spherically expanding flames EI SCIE Scopus
期刊论文 | 2018 , 43 (36) , 17531-17541 | INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
WoS CC Cited Count: 1 SCOPUS Cited Count: 1
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Abstract :

The self-acceleration of spherically expanding flames were investigated using a constant volume combustion chamber for CO/H-2/O-2/N-2 mixtures over a wide range of initial pressure from 0.2 to 0.6 MPa, CO/H-2 ratio from 50/50 to 10/90 and equivalence ratio from 0.4 to 1.5. The adiabatic flame temperature was kept constant by adjusting O-2/N-2 ratio at different equivalence ratios. Schlieren images were recorded to investigate the flame front evolution of spherically expanding flames. Local acceleration exponents were extracted using a proper equation to study the process of flame self-acceleration. Results show that the flame cells develop on the smooth flame fronts and finally reach fractal-like structures due to the hydrodynamic and diffusional-thermal instabilities, resulting in flame self-accelerative propagation. The critical Peclet number corresponding to the onset of self acceleration, Pe(cr) increases nonlinearly with the Markstein length, Ma. The observation further reveals that the onset of self-acceleration is mainly controlled by the diffusional-thermal effect. There exists two distinct flame propagation regimes in the self acceleration, namely quick transition accelerative and quasi self-similar accelerative regimes. The quick transition regime is controlled by the destabilization effect of hydrodynamic perturbation and stabilization effect of flame stretch. While the quasi self-similar regime is primarily affected by the cascading process of flame front cells controlled by hydrodynamic instability. The self-similar acceleration exponent, alpha(s) varies with the initial pressure and Lewis number, Le. The values of alpha(s) are measured to be 1.1-1.25 (smaller than 1.5), indicating the flame dose not attain self-turbulization. (C) 2018 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.

Keyword :

Flame instability Syngas Spherically expanding flame Acceleration exponent Flame self-acceleration Self-acceleration regime

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GB/T 7714 Cai, Xiao , Wang, Jinhua , Zhao, Haoran et al. Flame morphology and self-acceleration of syngas spherically expanding flames [J]. | INTERNATIONAL JOURNAL OF HYDROGEN ENERGY , 2018 , 43 (36) : 17531-17541 .
MLA Cai, Xiao et al. "Flame morphology and self-acceleration of syngas spherically expanding flames" . | INTERNATIONAL JOURNAL OF HYDROGEN ENERGY 43 . 36 (2018) : 17531-17541 .
APA Cai, Xiao , Wang, Jinhua , Zhao, Haoran , Zhang, Meng , Huang, Zuohua . Flame morphology and self-acceleration of syngas spherically expanding flames . | INTERNATIONAL JOURNAL OF HYDROGEN ENERGY , 2018 , 43 (36) , 17531-17541 .
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Investigation of the Heat Loss Effect on Cellular Flames via Proper Orthogonal Decomposition EI SCIE Scopus
期刊论文 | 2018 , 190 (5) , 803-822 | COMBUSTION SCIENCE AND TECHNOLOGY
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Abstract :

For better control of a lean premixed combustion system, it is necessary to understand the mechanism of unsteady cellular flame. The objective of the present study is to investigate how heat loss influences the cellular instability of lean premixed flame. The lean premixed CH4/H-2/air cellular flames generated on a McKenna burner were studied, and heat loss was responsible for the manifestation of unsteady cellular structure. A method of applying proper orthogonal decomposition in scale analysis is presented, which has proven helpful in characterizing the cellular flame. The multiple scale nature of unstable cellular flame was identified, and the small scales were found to act in the random movement of cells. The contribution of each scale is obtained. The energy distribution on modes indicates that the energy on higher-order modes, equivalently the contribution of smaller scales, is decreased with decreasing heat loss. Through analyzing the principal modes and temporal coefficients, heat loss is found to influence a flame's unstable behavior by promoting the oscillation of large scales, and the wrinkling factor is estimated. It is found that there is a cut-off length scale, below which the wrinkles make little contribution to the enhancement of combustion intensity.

Keyword :

OH-PLIF Heat loss McKenna burner Cellular flame Proper orthogonal decomposition

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GB/T 7714 Jin, Wu , Wang, Jinhua , Zhang, Weijie et al. Investigation of the Heat Loss Effect on Cellular Flames via Proper Orthogonal Decomposition [J]. | COMBUSTION SCIENCE AND TECHNOLOGY , 2018 , 190 (5) : 803-822 .
MLA Jin, Wu et al. "Investigation of the Heat Loss Effect on Cellular Flames via Proper Orthogonal Decomposition" . | COMBUSTION SCIENCE AND TECHNOLOGY 190 . 5 (2018) : 803-822 .
APA Jin, Wu , Wang, Jinhua , Zhang, Weijie , Cai, Xiao , Nie, Yaohui , Huang, Zuohua . Investigation of the Heat Loss Effect on Cellular Flames via Proper Orthogonal Decomposition . | COMBUSTION SCIENCE AND TECHNOLOGY , 2018 , 190 (5) , 803-822 .
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Numerical simulation of premixed combustion using the modified dynamic thickened flame model coupled with multi-step reaction mechanism EI SCIE Scopus
期刊论文 | 2018 , 233 , 346-353 | FUEL
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Abstract :

Thickened flame (TF) model is one of the effective methods to resolve the flame front in turbulent premixed combustion modeling. The multi-step reaction mechanism is becoming increasingly important for combustion simulations such as pollutant formation, ignition and extinction. The effect of TF model on flame structures when coupling with multi-step reaction mechanism was investigated. The simulation results show that, no matter in laminar or turbulent condition, the global TF model coupling with multi-step reaction mechanism results in an incomplete combustion, which is mainly due to the enhanced species diffusion. Although Durand and Polifke's dynamic thickened flame (DTF) sensor performs well for predicting laminar flame structure when coupling with multi-step reaction mechanism, it underestimates the effective thickening factor. In turbulent premixed flame simulation, the underestimated thickening factor leads to a faster local fuel consumption speed because of the over-predicted sub-grid flame wrinkling factor. A modified DTF sensor suitable for multi-step reaction mechanism is proposed. This sensor using the hyperbolic tangent function of progress variable to calculate thickening factor dynamically. It ensures that both the preheated and reaction zones are thickened effectively. The sub-grid wrinkling factor is hence estimated corresponding to the calculated flame thickness. Results of 1D laminar and 3D turbulent flame show that this method performs well for predicting both burned gas temperature and species concentration in burnt gas, which is important for predicting emissions.

Keyword :

Large Eddy Simulation Premixed flame Dynamic thickened flame model Multi-step reaction mechanism

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GB/T 7714 Guo, Shilong , Wang, Jinhua , Wei, Xutao et al. Numerical simulation of premixed combustion using the modified dynamic thickened flame model coupled with multi-step reaction mechanism [J]. | FUEL , 2018 , 233 : 346-353 .
MLA Guo, Shilong et al. "Numerical simulation of premixed combustion using the modified dynamic thickened flame model coupled with multi-step reaction mechanism" . | FUEL 233 (2018) : 346-353 .
APA Guo, Shilong , Wang, Jinhua , Wei, Xutao , Yu, Senbin , Zhang, Meng , Huang, Zuohua . Numerical simulation of premixed combustion using the modified dynamic thickened flame model coupled with multi-step reaction mechanism . | FUEL , 2018 , 233 , 346-353 .
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Effect of DC electric field on laminar premixed spherical propagation flame at elevated pressures up to 0.5MPa EI SCIE Scopus
期刊论文 | 2018 , 190 (11) , 1900-1922 | COMBUSTION SCIENCE AND TECHNOLOGY
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Abstract :

The effects of DC electric field on laminar premixed CH4/air spherical propagation flames with excess air ratio =1.0, 1.2, 1.4 were investigated in a constant volume combustion chamber at elevated pressures up to 0.5MPa. Mesh electrodes were used to generate electric field inside the chamber. The flame front structure, flame displacement speed, and pressure-related combustion parameters were derived to evaluate the effects of electric field on flame propagation. The results show that the mean flame displacement speed increases in the electric field direction with the increase of applied voltages and it is more significant at lean conditions. The mean flame displacement speed decreases in the direction perpendicular to the electric field with the voltage at low pressures, while it increases with voltage due to flame instability induced by the electric field at higher pressures. The effect of electric field on flame displacement speed is more obvious with pressure rise. Electric-induced flame instability combined with the hydrodynamic instability both promoted at high pressure lead to much more cracked structure and enhance the flame displacement speed. An obvious acceleration stage during the flame propagation under electric field is also observed. The combustion peak pressure slightly increases and the timing of peak pressure is in advance with the increasing of applied voltage. The flame initiation time derived from pressure decreases with voltage and it is more obvious at higher pressures. In this study, a new ionic wind velocity calculation method was developed based on the ionic wind development degree and conservation of momentum. As pressure increases, the corrected ionic wind velocity decreases, and the tendency is consistent with the experimental results about increment of flame displacement speed at elevated pressures.

Keyword :

High pressure Ionic wind Flame instability Electric-assisted combustion Spherically expanding flame

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GB/T 7714 Li, Yiming , Wang, Jinhua , Xia, Hao et al. Effect of DC electric field on laminar premixed spherical propagation flame at elevated pressures up to 0.5MPa [J]. | COMBUSTION SCIENCE AND TECHNOLOGY , 2018 , 190 (11) : 1900-1922 .
MLA Li, Yiming et al. "Effect of DC electric field on laminar premixed spherical propagation flame at elevated pressures up to 0.5MPa" . | COMBUSTION SCIENCE AND TECHNOLOGY 190 . 11 (2018) : 1900-1922 .
APA Li, Yiming , Wang, Jinhua , Xia, Hao , Li, Chao , Zhang, Meng , Wu, Xiaomin et al. Effect of DC electric field on laminar premixed spherical propagation flame at elevated pressures up to 0.5MPa . | COMBUSTION SCIENCE AND TECHNOLOGY , 2018 , 190 (11) , 1900-1922 .
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Effects of Initiation Radius Selection and Lewis Number on Extraction of Laminar Burning Velocities from Spherically Expanding Flames EI SCIE Scopus
期刊论文 | 2018 , 190 (2) , 286-311 | COMBUSTION SCIENCE AND TECHNOLOGY
WoS CC Cited Count: 2 SCOPUS Cited Count: 3
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Abstract :

Experimental flame trajectories of hydrogen/air and n-butane/air spherically expanding flames were measured over a wide range of equivalence ratios at pressures of 0.1 MPa and 0.05 MPa. An experimental radius range selection method was developed to determine the critical initiation and end radii for extraction of laminar burning velocity. The results showed that both flame radius range selection and nonlinear flame stretch have significant effects on laminar burning velocity extraction. As the selected initiation radius increases, the flame radius range effect increases. Thus, the widest unaffected radius range should be processed using a proper method to reduce the extraction induced uncertainty. Additionally, the extraction method, which reflects a linear relationship between the flame propagation speed and the flame curvature, well fits the experimental data for a wide radius range when Lewis number, Le > 1. And the performances of all tested extraction methods are almost equal when Le < 1, especially for Le slightly smaller than unity. The nonlinear method is still recommended in extraction for very small Le. The critical initiation radius depends strongly on the Lewis number and initial pressure, and increases linearly with the absolute value of Markstein length. At large and small Le, the initiation radius used in measurements should be large enough to ensure reliable extraction results. Furthermore, the critical initiation radius is affected by transition and spark-assisted propagation regimes for Le > 1 and Le < 1, respectively. It is concluded that the proper flame radius range for extraction is narrowed primarily by the strong flame stretch effects, which increase the critical initiation radius for stable flames.

Keyword :

Laminar burning velocity Critical initiation radius Flame radius range Spherically expanding flame Flame stretch

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GB/T 7714 Cai, Xiao , Wang, Jinhua , Zhao, Haoran et al. Effects of Initiation Radius Selection and Lewis Number on Extraction of Laminar Burning Velocities from Spherically Expanding Flames [J]. | COMBUSTION SCIENCE AND TECHNOLOGY , 2018 , 190 (2) : 286-311 .
MLA Cai, Xiao et al. "Effects of Initiation Radius Selection and Lewis Number on Extraction of Laminar Burning Velocities from Spherically Expanding Flames" . | COMBUSTION SCIENCE AND TECHNOLOGY 190 . 2 (2018) : 286-311 .
APA Cai, Xiao , Wang, Jinhua , Zhao, Haoran , Xie, Yongliang , Huang, Zuohua . Effects of Initiation Radius Selection and Lewis Number on Extraction of Laminar Burning Velocities from Spherically Expanding Flames . | COMBUSTION SCIENCE AND TECHNOLOGY , 2018 , 190 (2) , 286-311 .
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A comparison study of cyclopentane and cyclohexane laminar flame speeds at elevated pressures and temperatures EI SCIE Scopus
期刊论文 | 2018 , 234 , 238-246 | FUEL
SCOPUS Cited Count: 1
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Abstract :

Laminar flame speeds of cyclopentane/air and cyclohexane/air mixtures were determined at equivalence ratios of 0.7-1.6, initial pressures of 1-5 atm, and initial temperatures of 353-453 K using the spherically propagating flame method. Four recently published models of cyclopentane and cyclohexane were validated by current experimental data and showed a reasonable agreement, especially for JetSurF2.0 model and Tian model. A comparison of cyclopentane/air and cyclohexane/air laminar flame speeds was conducted over wide conditions. A comprehensive analysis was conducted through thermal, transport and chemical kinetic effects, and the reaction path analysis and sensitive analysis were employed to further investigate the chemical kinetic effects. The results showed that the laminar flame speed of cyclohexane/air mixture is larger than that of cyclopentane/air and the discrepancy increases with the initial pressure. The discrepancy mainly results from the chemical kinetic effects. Specifically, cyclopentane generates more methyl and allyl intermediates which can consume large amounts of H radicals and induce chain terminating reactions. While, cyclohexane generates a larger amount of ethyl and 1,3-butadiene intermediates which can further yield more vinyl, and the later can induce chain branching reactions and increase the overall burning rate. Thus, it is the different distribution of the cracked products in cyclopentane/air and cyclohexane/air flames that leads to the discrepancy of laminar flame speeds.

Keyword :

Cyclohexane Elevated pressures Elevated temperatures Laminar flame speeds Cyclopentane

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GB/T 7714 Zhao, Haoran , Wang, Jinhua , Cai, Xiao et al. A comparison study of cyclopentane and cyclohexane laminar flame speeds at elevated pressures and temperatures [J]. | FUEL , 2018 , 234 : 238-246 .
MLA Zhao, Haoran et al. "A comparison study of cyclopentane and cyclohexane laminar flame speeds at elevated pressures and temperatures" . | FUEL 234 (2018) : 238-246 .
APA Zhao, Haoran , Wang, Jinhua , Cai, Xiao , Tian, Zemin , Li, Qianqian , Huang, Zuohua . A comparison study of cyclopentane and cyclohexane laminar flame speeds at elevated pressures and temperatures . | FUEL , 2018 , 234 , 238-246 .
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Investigation of the fuel effects on burning velocity and flame structure of turbulent premixed flames based on leading points concept EI SCIE Scopus
期刊论文 | 2018 , 190 (8) , 1354-1376 | COMBUSTION SCIENCE AND TECHNOLOGY
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The measurements on flame structure and burning velocities of C3H8/air, CH4/air and CO/H-2/air turbulent premixed flames were conducted. Various experimental conditions for these mixtures were considered to understand the molecular and thermal diffusion process in turbulent flame, which was referred to the fuel effects. The fuel effects are interpreted as local burning velocity variation caused by molecular and thermal diffusivity with stretch effect. Leading points concept is a promising scaling approach to incorporate the fuel effects in turbulent flames recently. In this article, data across a variety of equivalence ratio and hydrogen fractions were obtained using Bunsen burner. Flame front was detected with OH-PLIF technique and turbulent burning velocity S-T referred to leading edge was derived. A new leading points characteristic speed S-L,S-LP was presented invoking both negative and positive Markstein number mixtures, revising the previous model in literature which is only suitable for negative Markstein number fuels. The turbulent burning velocity S-T under relatively weak turbulence intensity in this study and data of high turbulence intensity, high pressure from literature were renormalized with S-L,S-LP instead of S-L,S-0 based on leading points concept, where S-L,S-0 is the unstretched laminar flame speed. The results show that all the data sets were collapsed well which validated the significance of S-L,S-LP in normalizing S-T of different mixtures. An empirical formula for turbulent burning velocity correlation was obtained as. This formula is similar to that of Kobayashi; however, it shows superiority in incorporating the fuel effects.

Keyword :

leading points concept turbulent premixed flame Turbulent burning velocity fuel effects

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GB/T 7714 Zhang, Weijie , Wang, Jinhua , Yu, Qianqian et al. Investigation of the fuel effects on burning velocity and flame structure of turbulent premixed flames based on leading points concept [J]. | COMBUSTION SCIENCE AND TECHNOLOGY , 2018 , 190 (8) : 1354-1376 .
MLA Zhang, Weijie et al. "Investigation of the fuel effects on burning velocity and flame structure of turbulent premixed flames based on leading points concept" . | COMBUSTION SCIENCE AND TECHNOLOGY 190 . 8 (2018) : 1354-1376 .
APA Zhang, Weijie , Wang, Jinhua , Yu, Qianqian , Jin, Wu , Zhang, Meng , Huang, Zuohua . Investigation of the fuel effects on burning velocity and flame structure of turbulent premixed flames based on leading points concept . | COMBUSTION SCIENCE AND TECHNOLOGY , 2018 , 190 (8) , 1354-1376 .
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Investigation on the highly negative curved syngas Bunsen flame and the critical local Karlovitz number when tip opening EI SCIE Scopus
期刊论文 | 2018 , 215 , 429-437 | FUEL
WoS CC Cited Count: 1
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The characteristics of local extinction on the tip of syngas premixed Bunsen flames with different hydrogen fractions have been investigated experimentally with OH-PLIF technique and numerical simulation. Coupled effects of stretch and diffusion on the syngas Bunsen flame with highly negative curvature were studied. Local Karlovitz number was introduced to indicate the onset of local extinction at the Bunsen flame tip. Results showed that the onset equivelance ratio of local extinction at the syngas Bunsen flame tip does not change with the outlet velocity. The coupled effects of stretch and diffusion result in the decrease of flame reaction rate along the syngas Bunsen flame at fuel-lean condition. When the flame reaction rate decrease to a critical extent, local extinction of Bunsen flame tip occures. The local Karlovitz number can be considered as a parameter of the critical condition. The syngas Bunsen flame tip will extinguish when the local Karlovitz number reaches around 4, irrespective of hydrogen fractions and outlet velocity. This means that Bunsen flame tip starts to appear local extinction when the tangential flow time is comparable to normal chemical reaction time, which is the same as counterflow flames with positive stretch. Furthermore, results also showed that there is no H-2 leakage even the syngas Bunsen flame tip extinguishes at the numerical study conditions.

Keyword :

OH-PLIF Local extinction Flame stretch Local Karlovitz number Syngas

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GB/T 7714 Wang, Jinhua , Nie, Yaohui , Cai, Xiao et al. Investigation on the highly negative curved syngas Bunsen flame and the critical local Karlovitz number when tip opening [J]. | FUEL , 2018 , 215 : 429-437 .
MLA Wang, Jinhua et al. "Investigation on the highly negative curved syngas Bunsen flame and the critical local Karlovitz number when tip opening" . | FUEL 215 (2018) : 429-437 .
APA Wang, Jinhua , Nie, Yaohui , Cai, Xiao , Guo, Shilong , Zhang, Weijie , Xie, Yongliang et al. Investigation on the highly negative curved syngas Bunsen flame and the critical local Karlovitz number when tip opening . | FUEL , 2018 , 215 , 429-437 .
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Turbulent flame topology and the wrinkled structure characteristics of high pressure syngas flames up to 1.0 MPa EI Scopus
期刊论文 | 2018 | International Journal of Hydrogen Energy
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The turbulent flame topology characteristics of the model syngas with two different hydrogen ratios were statistically investigated, namely CO/H2 ratio at 65/35 and 80/20, at equivalence ratio of 0.7. The combustion pressure was kept at 0.5 MPa and 1.0 MPa, to simulate the engine-like condition. The model syngas was diluted with CO2 with a mole fraction of 0.3 which mimics the flue gas recycle in the turbulent combustion. CH4/air flame with equivalence ratio of 1.0 was also tested for comparison. The flame was anchored on a premixed type Bunsen burner, which can generate a controllable turbulent flow. Flame front, which is represented by the sharp increased interface of the OH radical distribution, was measured with OH-PLIF technique. Flame front parameters were obtained through image processing to interpret the flame topology characteristics. Results showed that the turbulent flames possess a wrinkled character with smaller scale concave/convex structure superimposed on a larger scale convex structure under high pressure. The wrinkled structure of syngas flame is much finer and more corrugated than hydrocarbon fuel flames. The main reason is that scale of wrinkled structure is smaller for syngas flame, resulting from the unstable physics. Hydrogen in syngas can increase the intensity of the finer structure. Moreover, the model syngas flames have larger flame surface density than CH4/air flame, and hydrogen ratio in syngas can increase flame surface density. This would be mainly attributed to the fact that the syngas flames have smaller flame intrinsic instability scale li than CH4/air flame. ST/SL of the model syngas tested in this study is higher than CH4/air flames for both pressures, due to the high diffusivity and fast burning property of H2. This is mainly due to smaller LM and li. Vf of the two model syngas is much smaller than CH4/air flames, which suggests that syngas flame would lead to a larger possibility to occur combustion oscillation. © 2018 Hydrogen Energy Publications LLC

Keyword :

High pressure Hydrogen ratio Syn-gas Turbulent flame Turbulent premixed flame

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GB/T 7714 Zhang, Meng , Wang, Jinhua , Chang, Min et al. Turbulent flame topology and the wrinkled structure characteristics of high pressure syngas flames up to 1.0 MPa [J]. | International Journal of Hydrogen Energy , 2018 .
MLA Zhang, Meng et al. "Turbulent flame topology and the wrinkled structure characteristics of high pressure syngas flames up to 1.0 MPa" . | International Journal of Hydrogen Energy (2018) .
APA Zhang, Meng , Wang, Jinhua , Chang, Min , Huang, Zuohua . Turbulent flame topology and the wrinkled structure characteristics of high pressure syngas flames up to 1.0 MPa . | International Journal of Hydrogen Energy , 2018 .
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Effect of hydrogen enrichment and electric field on lean CH4/air flame propagation at elevated pressure EI Scopus
期刊论文 | 2018 | International Journal of Hydrogen Energy
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Electric assisted combustion for hydrogen enriched hydrocarbons may even extend the lean burn limit and provide the further improvement on combustion stability. This study investigates the effect of hydrogen enrichment and DC electric field on lean CH4/air flame propagation. Electric field inside the chamber was generated by mesh and needle electrodes. Effect of hydrogen enrichment on the ion mole fraction in the flame was discussed based on reaction mechanism included neutral and ion reactions. The flame propagation images, flame displacement speed were used to evaluate the combined influences of hydrogen enrichment and electric field on propagating flame. Results showed that the hydrogen addition would increase positive ions mole fraction and the peak value is mainly determined by H3O+. This would be due to that CH increases with hydrogen fraction, which is the main species in the initial reaction for the ion reactions. Electric field effect about flame propagation was suppressed with hydrogen addition due to the competition between the increment in ion mole fraction and the decrement in flame time. Electric assisted combustion is more evident at leaner conditions and elevated pressure. The ratio of ionic wind velocity to flow velocity may be the determined factor to predict the electric field effect about propagating flame. The tendency based on this ratio is in accordance with the experimental results for various hydrogen fraction and equivalence ratio at elevated pressure. © 2018 Hydrogen Energy Publications LLC

Keyword :

Elevated pressure Flame propagation Hydrogen enrichment Ionic wind Mole fraction

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GB/T 7714 Wang, Jinhua , Li, Yiming , Xia, Hao et al. Effect of hydrogen enrichment and electric field on lean CH4/air flame propagation at elevated pressure [J]. | International Journal of Hydrogen Energy , 2018 .
MLA Wang, Jinhua et al. "Effect of hydrogen enrichment and electric field on lean CH4/air flame propagation at elevated pressure" . | International Journal of Hydrogen Energy (2018) .
APA Wang, Jinhua , Li, Yiming , Xia, Hao , Ju, Rongyuan , Zhang, Meng , Mu, Haibao et al. Effect of hydrogen enrichment and electric field on lean CH4/air flame propagation at elevated pressure . | International Journal of Hydrogen Energy , 2018 .
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