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Influence of precessing vortex core on flame flashback in swirling hydrogen flames

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Author

Summary, in English

This study examines the influence of vortex core precession on flame flashback of swirl-stabilised hydrogen flames. Theoretical considerations suggest that the angular velocity of a swirling flow is reduced as vortex precession causes it to acquire an eccentric motion around the central axis of the burner. The eccentric motion of the vortex generates a secondary flow, which is thought to reduce the angular velocity and tangential momentum available to the primary flow, and thereby reduce the flashback propensity at the centre of the vortex core. Experiments measuring the influence of the eccentric motion of the flame tip on flame flashback behaviour were conducted using high-speed sequences of OH*-chemiluminescence images. Temporal analysis of a large sample of images revealed the existence of a systematic rotational frequency of the flame tip around the central axis of the burner. Analysis of the radial position of the flame tip in relation to its axial propagation velocity showed that flashback velocity increased as the flame tip eccentricity approached zero and flashback velocity decreased as the eccentricity amplitude of the flame tip reached larger values. This suggested that flame eccentricity caused by vortex core precession may be detrimental to upstream flame propagation and may be effective in inhibiting flame flashback in swirl-stabilised flames. Copyright (C) 2014, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.

Publishing year

2014

Language

English

Pages

20233-20241

Publication/Series

International Journal of Hydrogen Energy

Volume

39

Issue

35

Document type

Journal article

Publisher

Elsevier

Topic

  • Energy Engineering

Keywords

  • Hydrogen
  • Flashback
  • Gas turbine
  • Precessing vortex core (PVC)
  • OH-chemiluminescence

Status

Published

ISBN/ISSN/Other

  • ISSN: 1879-3487