Experimental and modeling study of the effect of elevated pressure on lean high-hydrogen syngas flames

Goswami, M Mayuri; Griensven, van Jgh Hans; Bastiaans, Rjm Rob; Konnov, Alexander A.; Goey, de Lph Philip

doi:10.1016/j.proci.2014.05.057

Cited by 42 publications

(32 citation statements)

References 21 publications

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“…Goswami et al [51] also found that in H2/CO syngas fuel mixture, where CO is 15-30%, chemistry is subsequently dominated by H2, and therefore the production of carbon containing radicals such as CH2O, HCO further helps by H+O2=OH+O.…”

Section: Normalised Hydrogen-to-oxygen Mass Ratio and Radical Speciesmentioning

confidence: 98%

“…The H2/CO syngas-air combustion is simulated using a skeletal mechanism developed by Goswami et al [50,51]. This skeletal mechanism incorporates the thermodynamic, kinetic, and species transport properties related to elevated pressure H2 and CO oxidation, consisting of 14 species (O, O2, N2, H, H2, H2O, OH, H2O2, HO2, CO, CO2, HOCO, HCO, CH2O) and 52 individual reactions.…”

Section: Mathematical Equationsmentioning

confidence: 99%

“…This may be due to the physical effects of pressure discussed above but could also be related to the pressuresensitive reaction mechanisms. For example, the sensitivity analysis carried out by Goswami et al [51] found that the reaction H+O2=OH+O, and CO oxidation reaction CO+OH=CO2+H are very sensitive to changes in pressure. In addition, Goswami et al…”

Section: Normalised Hydrogen-to-oxygen Mass Ratio and Radical Speciesmentioning

confidence: 99%

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Effects of pressure on cellular flame structure of high hydrogen content lean premixed syngas spherical flames: A DNS study

Dinesh

Shalaby

Luo

et al. 2016

International Journal of Hydrogen Energy

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2016). Effects of pressure on cellular flame structure of high hydrogen content lean premixed syngas spherical flames: A DNS study. International Journal of Hydrogen Energy, 41(46), 21516-21531. DOI: 10.1016/j.ijhydene.2016 General rights Copyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights.• Users may download and print one copy of any publication from the public portal for the purpose of private study or research.• You may not further distribute the material or use it for any profit-making activity or commercial gain • You may freely distribute the URL identifying the publication in the public portal ? Take down policyIf you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim. The joint probability density functions of OH radical mass fraction and temperature show broadening OH values in the high temperature zone at elevated pressures compared to its distribution at the atmospheric pressure. Comparisons of mean species distributions of 3 OH and HO2 over temperature between laminar and turbulent flames show that pressure elevation has a major influence on the flame structure in the composition space.

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Section: Normalised Hydrogen-to-oxygen Mass Ratio and Radical Speciesmentioning

confidence: 98%

Section: Mathematical Equationsmentioning

confidence: 99%

Section: Normalised Hydrogen-to-oxygen Mass Ratio and Radical Speciesmentioning

confidence: 99%

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Effects of pressure on cellular flame structure of high hydrogen content lean premixed syngas spherical flames: A DNS study

Dinesh

Shalaby

Luo

et al. 2016

International Journal of Hydrogen Energy

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“…In this investigation we have employed a H2/CO kinetic scheme developed and validated at elevated pressure by Goswami et al [35,36]. This reaction model incorporates the thermodynamic, kinetic, and species transport properties related to elevated pressure H2…”

Section: Governing Equations Chemistry and Diffusion Modelmentioning

confidence: 99%

“…Only recent studies [33][34][35][36] have reported hydrogen and HHC syngas fuel chemical kinetic mechanisms at elevated pressures, which are yet to be applied to scrutinize the role of detailed chemical mechanisms in predicting key chemical species mass fractions in lean premixed syngas combustion at elevated pressures.…”

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confidence: 99%

High hydrogen content syngas fuel burning in lean premixed spherical flames at elevated pressures: Effects of preferential diffusion

Dinesh

Shalaby

Luo

et al. 2016

International Journal of Hydrogen Energy

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This study addresses the effects of preferential diffusion on flame structure and propagation of high hydrogen content (HHC) turbulent lean premixed hydrogen-carbon monoxide syngas flames at elevated pressures. The direct numerical simulations with detailed chemistry were performed in three-dimensional domain for expanding spherical flame configuration in a constant pressure combustion chamber. To identify the role of preferential diffusion on flame structure and propagation under low and high turbulence levels at elevated pressure, simulations were performed at an initial turbulent Reynolds number of 15 and 150 at a pressure value of 4bar. The results demonstrate that the thermo-diffusive instability greatly influences the lean premixed syngas cellular flame structure due to strong preferential diffusion effects under low turbulence level at elevated pressure. In contrast, the results reveal that the thermo-diffusive effects are destabilising and preferential diffusion is overwhelmed by turbulent mixing under high turbulence level at elevated pressure. This finding suggests that the development of cellular flame structure is dominated by turbulence with little or no contribution from the thermo-diffusive instability for the lean premixed syngas flame which operates under conditions of high turbulence and elevated pressures. However, results demonstrate that the flame acceleration and species diffusive flux are still influenced by the preferential diffusion for the lean premixed syngas flame which operates under conditions of high turbulence and elevated pressures.

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Demarcation of reaction effects on laminar burning velocities of diluted syngas–air mixtures at elevated temperatures

Varghese

Kolekar

Kumar

2018

Int J of Chemical Kinetics

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Laminar burning velocities of CO2/N2 (60%, 70%) diluted H2/CO/air mixtures were measured at elevated temperatures using the externally heated diverging channel method. The computed burning velocities using the two reaction mechanisms (Davis et al., Proc. Combust. Inst. 2005;30(1):1283–1292; FFCM‐1, http://nanoenergy.stanford.edu/ffcm1) are compared with the experimentally determined burning velocities. The accuracy of the chemical kinetic mechanisms at high dilution rates and elevated temperatures was investigated for various hydrogen fractions in the fuel composition. The burning velocity is observed to increase at high temperatures due to higher mixture enthalpy. The dilution effect on the variation of laminar burning velocity was stronger for the CO2 dilution case compared to N2 dilution. A comparison between the FFCM‐1 mechanism and experimental measurements shows an accurate depiction of the reaction chemistry regarding the prediction of laminar burning velocities. The role of third‐body reactions and direct inhibiting effect of N2 and CO2 molecules on burning velocity of diluted syngas–air mixtures is analyzed in detail. Detailed kinetic analysis revealed that the use of GRI 3.0 collision efficiency factors in the Davis mechanism helps in accurately predicting the burning velocities at elevated temperatures and high CO2 dilution rates. The thermal effect dominates the reduction in laminar burning velocity for N2 dilution case. The FFCM‐1 mechanism agrees well with the experiments for syngas flames diluted with N2 compared to the Davis mechanism. The addition of third‐body efficiency of N2 in the FFCM‐1 mechanism improved the predictions of laminar burning velocities for the N2 dilution case.

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Experimental and modeling study of the effect of elevated pressure on lean high-hydrogen syngas flames

Cited by 42 publications

References 21 publications

Effects of pressure on cellular flame structure of high hydrogen content lean premixed syngas spherical flames: A DNS study

Effects of pressure on cellular flame structure of high hydrogen content lean premixed syngas spherical flames: A DNS study

High hydrogen content syngas fuel burning in lean premixed spherical flames at elevated pressures: Effects of preferential diffusion

Demarcation of reaction effects on laminar burning velocities of diluted syngas–air mixtures at elevated temperatures

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