TY  - JOUR
A1  - El Harrab, Hayat
A1  - Askar, Enis
A1  - Franken, T.
A1  - Mauss, F.
T1  - Experimental and reaction kinetic study of hydrogen ignition behavior at ignition limits
JF  - Proceedings of the Combustion Institute
N2  - The paper presents the results of an experimental and reaction kinetic investigation of hydrogen ignition at different pressures in a closed vessel, highlighting its non-linear behavior and the effects of radical wall termination. The reaction kinetic simulation predicts the three characteristic ignition limits of hydrogen caused by radical and thermal auto-ignition and is in close agreement with the experimental measurements. The first ignition limit is determined by the chain branching reaction H+O_2→O+ OH. This limit shows strong sensitivity towards the wall termination of O, H and OH radicals. The second ignition limit is influenced by the wall termination of O, H, OH, HO2 and H2O2 radicals. The third ignition limit is dominated by the reaction paths HO_2+HO_2→H_2 O_2+O_2 and H_2 O_2+M→2 OH+M, which is why it shows strong sensitivity towards wall termination of HO₂ and H₂O₂ radicals. Increasing the radical wall termination rate by increasing the sticking coefficient of the radicals at the wall or the surface-to-volume-ratio leads to an increase of the auto-ignition temperature at the same pressure. The introduction of radical wall termination reactions improved the prediction of ignition limits and highlighted the profound effect of the autoclave wall and vessel size on the hydrogen ignition behavior.
KW  - Radical Wall Termination Reaction
KW  - Hydrogen
KW  - Auto-ignition Temperature
KW  - Ignition Limit
PY  - 2025
UR  - https://nbn-resolving.org/urn:nbn:de:kobv:b43-647609
DO  - https://doi.org/10.1016/j.proci.2025.105980
SN  - 1540-7489
VL  - 41
SP  - 1
EP  - 7
PB  - Elsevier Inc.
AN  - OPUS4-64760
LA  - eng
AD  - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER  -