Numerical Prediction of Premixed Syngas/Air Explosion in a Closed Duct Using a Reduced Combustion Mechanism

Опубликована: Янв. 1, 2025

A reduced combustion mechanism for syngas/air has been developed with the aim of accurately predicting premixed flame behavior during explosions. The evolution flames in a closed duct, hydrogen volume fractions 50%, 70%, and 90%, was investigated using detached eddy simulation thickened model. results indicate that numerical simulations based on can effectively replicate explosion dynamics observed experiments, e.g., structures speeds. key elementary reactions significantly affect laminar burning velocity were identified by analyzing chemical reaction kinetics. As fraction increases, variation active free radicals influences relative production rates corresponding to primary pathway. coupling relationship between structure further elucidated comparing mass net rate O, H, OH, HO2 HCO radicals.

Язык: Английский

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Three-dimensional numerical prediction of premixed hydrogen/ammonia/air flames using large eddy simulation

International Journal of Hydrogen Energy, Год журнала: 2025, Номер 105, С. 1328 - 1339

Опубликована: Янв. 31, 2025

Язык: Английский

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Influence of Chemical Kinetics on Tulip Flame Formation in Highly Reactive (H2/Air) and Low Reactive (CH4/Air) Mixtures

Energies, Год журнала: 2025, Номер 18(4), С. 885 - 885

Опубликована: Фев. 13, 2025

The early stages of hydrogen–air and methane–air flame dynamics the development evolution tulip flames in closed tubes various aspect ratios a semi-open tube are studied by solving fully compressible reactive Navier–Stokes equations using high-order numerical method coupled to detailed chemical models for stoichiometric hydrogen/air methane/air mixtures. use adaptive mesh refinement (AMR) provides adequate resolution reaction zone, pressure waves, flame–pressure wave interactions. purpose this study is gain deeper insight into influence kinetics on combustion regimes leading formation its subsequent evolution. simulations highlight effect thickness, velocity, order intensity rarefaction generated during deceleration phase, which principal physical mechanism formation. obtained results explain most experimentally observed features formation, e.g., faster with shape compared slower flames.

Язык: Английский

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Numerical prediction of premixed syngas/air explosion in a closed duct using a reduced combustion mechanism

Fuel, Год журнала: 2025, Номер 392, С. 134798 - 134798

Опубликована: Фев. 26, 2025

Язык: Английский

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Flame dynamics, three-dimensional structure and flow field of premixed H2/air flame with heat loss

Renewable Energy, Год журнала: 2025, Номер unknown, С. 122805 - 122805

Опубликована: Март 1, 2025

Язык: Английский

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Chemiluminescence emissions of OH measured at different positions during flame propagation of H2/CH4 mixtures explosion

International Journal of Hydrogen Energy, Год журнала: 2025, Номер 113, С. 420 - 428

Опубликована: Март 1, 2025

Язык: Английский

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Explosion behavior of premixed hydrogen/ammonia/air mixtures with the addition of N2 and CO2

International Journal of Hydrogen Energy, Год журнала: 2025, Номер 117, С. 50 - 61

Опубликована: Март 14, 2025

Язык: Английский

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Investigation of real-fluid effects on NH3 oxidation and blending characteristics at supercritical conditions via high-order Virial equation of state coupled with ab initio intermolecular potentials

Combustion and Flame, Год журнала: 2024, Номер 272, С. 113887 - 113887

Опубликована: Дек. 3, 2024

Язык: Английский

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Deflagration propagation characteristics of hydrogen-air premixed gas in a closed duct: Effects of ammonia addition and obstacle arrangement

International Journal of Hydrogen Energy, Год журнала: 2024, Номер 100, С. 816 - 831

Опубликована: Дек. 27, 2024

Язык: Английский

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