OH*-chemiluminescence during autoignition of hydrogen with air in a pressurised turbulent flow reactor
Author
Summary, in English
Autoignition of hydrogen in air was studied in a turbulent flow reactor using OH*-chemiluminescence. High-speed imaging was used to visualise the formation of auto-ignition kernels in the flow, and to analyse the conditions under which temporary stabilisation of the flame kernels occurred. The experiments were carried out at temperatures of 800-850 K, pressures of 0.8-1.2 MPa and an equivalence ratio of phi = 0.25. Measurements of the autoignition delays yielded values in the range of tau = 210-447 ms. The autoignition delay results indicated that, over the range of conditions studied, ignition delays reduced with decreasing pressure. This observation contradicted homogeneous gas-phase kinetic calculations, which predicted an increase in autoignition delay with decreasing pressure. If the kinetic model was altered to include surface reactions at the reactor walls, the calculations could be qualitatively reconciled with the experimental data, suggesting that wall reactions had a significant influence on autoignition delays. Copyright (C) 2014, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
Department/s
Publishing year
2014
Language
English
Pages
12166-12181
Publication/Series
International Journal of Hydrogen Energy
Volume
39
Issue
23
Document type
Journal article
Publisher
Elsevier
Topic
- Atom and Molecular Physics and Optics
- Energy Engineering
Keywords
- Autoignition
- Hydrogen
- OH-chemiluminescence
- Surface reactions
- Kinetic
- modelling
- Flow reactor
Status
Published
ISBN/ISSN/Other
- ISSN: 1879-3487