OH*-chemiluminescence during autoignition of hydrogen with air in a pressurised turbulent flow reactor

Research output: Contribution to journalArticle

Abstract

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.

Details

Authors
Organisations
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Atom and Molecular Physics and Optics
  • Energy Engineering

Keywords

  • Autoignition, Hydrogen, OH-chemiluminescence, Surface reactions, Kinetic, modelling, Flow reactor
Original languageEnglish
Pages (from-to)12166-12181
JournalInternational Journal of Hydrogen Energy
Volume39
Issue number23
Publication statusPublished - 2014
Publication categoryResearch
Peer-reviewedYes