Statistics and topology of local flame–flame interactions in turbulent flames

Ankit Tyagi, Isaac Boxx, Stephen J. Peluso, Jacqueline Antonia O'Connor

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Flame–flame interaction events occur frequently in turbulent premixed flames and change the local structure and dynamics of flames. It is essential to understand these flame–flame interaction events to develop high-fidelity combustion models for use in modern combustion devices. In this study, we experimentally investigate the topology of flame–flame interaction events in single- and multi-flame configurations. A dual-burner experiment is probed with high-speed OH-planar laser-induced fluorescence and stereoscopic-particle image velocimetry to obtain simultaneous flame front locations and velocity fields. A non-rigid image registration technique is implemented to track the topological changes occurring in these flames. In both single- and dual-flame configurations, small-scale interactions occur more frequently compared to large-scale interactions, and statistics show that most of the reactant-side interactions contribute to large flame surface destructions than the product-side interactions. It is also found that turbulence length- and velocity-scales can play an important role in facilitating the interaction events and pocket formations from these events. Filamentarity is used to quantify the two-dimensional shape of these interactions and comparisons are made between the orientation and shape of interaction events and the local turbulence in the flowfield. Alignment between the orientation of the interaction shapes and the principal strain rates show that compressive fluid forces drive both types of interaction events.

Original languageEnglish (US)
Pages (from-to)92-104
Number of pages13
JournalCombustion and Flame
Volume203
DOIs
StatePublished - May 1 2019

Fingerprint

turbulent flames
Turbulence
topology
Topology
Statistics
statistics
Image registration
Fuel burners
Velocity measurement
Strain rate
flames
Fluorescence
interactions
Fluids
Lasers
Experiments
turbulence
premixed flames
flame propagation
burners

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)
  • Fuel Technology
  • Energy Engineering and Power Technology
  • Physics and Astronomy(all)

Cite this

Tyagi, Ankit ; Boxx, Isaac ; Peluso, Stephen J. ; O'Connor, Jacqueline Antonia. / Statistics and topology of local flame–flame interactions in turbulent flames. In: Combustion and Flame. 2019 ; Vol. 203. pp. 92-104.
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Statistics and topology of local flame–flame interactions in turbulent flames. / Tyagi, Ankit; Boxx, Isaac; Peluso, Stephen J.; O'Connor, Jacqueline Antonia.

In: Combustion and Flame, Vol. 203, 01.05.2019, p. 92-104.

Research output: Contribution to journalArticle

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