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

Published: Jan. 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.

Language: Английский

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

International Journal of Hydrogen Energy, Journal Year: 2025, Volume and Issue: 105, P. 1328 - 1339

Published: Jan. 31, 2025

Language: 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, Journal Year: 2025, Volume and Issue: 18(4), P. 885 - 885

Published: Feb. 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.

Language: Английский

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

Fuel, Journal Year: 2025, Volume and Issue: 392, P. 134798 - 134798

Published: Feb. 26, 2025

Language: Английский

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

Renewable Energy, Journal Year: 2025, Volume and Issue: unknown, P. 122805 - 122805

Published: March 1, 2025

Language: 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, Journal Year: 2025, Volume and Issue: 113, P. 420 - 428

Published: March 1, 2025

Language: 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, Journal Year: 2025, Volume and Issue: 117, P. 50 - 61

Published: March 14, 2025

Language: 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, Journal Year: 2024, Volume and Issue: 272, P. 113887 - 113887

Published: Dec. 3, 2024

Language: 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, Journal Year: 2024, Volume and Issue: 100, P. 816 - 831

Published: Dec. 27, 2024

Language: Английский

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