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|Publication type:||Article in scientific journal|
|Type of review:||Peer review (publication)|
|Title:||Direct Numerical Simulation of hydrogen combustion at auto-ignitive conditions : ignition, stability and turbulent reaction-front velocity|
Chen, Jacqueline H.
Williams, Forman A.
|Published in:||Combustion and Flame|
|Publisher / Ed. Institution:||Elsevier|
|Subjects:||Hydrogen; Spontaneous ignition; Reheat combustion; Flame pulsation; Turbulent flame velocity; Direct Numerical Simulation|
|Subject (DDC):||621.04: Energy engineering|
|Abstract:||Direct Numerical Simulations (DNS) are performed to investigate the process of spontaneous ignition of hydrogen flames at laminar, turbulent, adiabatic and non-adiabatic conditions. Mixtures of hydrogen and vitiated air at temperatures representing gas-turbine reheat combustion are considered. Adiabatic spontaneous ignition processes are investigated first, providing a quantitative characterization of stable and unstable flames. Results indicate that, in hydrogen reheat combustion, compressibility effects play a key role in flame stability and that unstable ignition and combustion are consistently encountered for reactant temperatures close to the mixture’s characteristic crossover temperature. Furthermore, it is also found that the characterization of the adiabatic processes is also valid in the presence of non-adiabaticity due to wall heat-loss. Finally, a quantitative characterization of the instantaneous fuel consumption rate within the reaction front is obtained and of its ability, at auto-ignitive conditions, to advance against the approaching turbulent flow of the reactants, for a range of different turbulence intensities, temperatures and pressure levels.|
|Fulltext version:||Published version|
|License (according to publishing contract):||CC BY 4.0: Attribution 4.0 International|
|Departement:||School of Engineering|
|Organisational Unit:||Institute of Energy Systems and Fluid Engineering (IEFE)|
|Appears in collections:||Publikationen School of Engineering|
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|2021_Gruber-etal_Direct-Numerical-Simulation-of-hydrogen-combustion.pdf||5.11 MB||Adobe PDF|
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