Pocket formation and behavior in turbulent premixed flames

Ankit Tyagi, Isaac Boxx, Stephen Peluso, Jacqueline O'Connor

Research output: Contribution to journalArticle

Abstract

Pocket formation is an important characteristic of turbulent premixed flames and understanding pocket behavior is key to developing high-fidelity numerical combustion models. In this study, a dual-burner experiment is used to study pockets in single- and dual-flame configurations and synchronized high-speed OH-planar laser-induced fluorescence and stereoscopic-particle image velocimetry imaging techniques are implemented to track flame pockets and the surrounding flow field. Statistical analysis of pocket origin and fate is performed using a novel tracking algorithm incorporating non-rigid image registration. Results show that pocket formation rates increase as a function of increasing inlet turbulence level; reactant pocket formation increases as a function of downstream distance, whereas product pocket formation decreases. Tracking reactant pocket lifetime shows that a majority of these pockets burn out and displacement speeds are characterized. Product pockets usually merge with the main flame surface, which could have an impact on local flame structure and propagation. Results presented in this study show that pocket behavior in turbulent flames can change local flame dynamics and it is important to capture these effects in sub-grid scale combustion models to accurately predict flame behavior.

Original languageEnglish (US)
Pages (from-to)312-324
Number of pages13
JournalCombustion and Flame
Volume211
DOIs
StatePublished - Jan 2020

Fingerprint

turbulent flames
premixed flames
flames
Image registration
Fuel burners
Velocity measurement
Flow fields
Statistical methods
Turbulence
Fluorescence
Imaging techniques
Lasers
capture effect
Experiments
burners
particle image velocimetry
products
imaging techniques
statistical analysis
laser induced fluorescence

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 ; O'Connor, Jacqueline. / Pocket formation and behavior in turbulent premixed flames. In: Combustion and Flame. 2020 ; Vol. 211. pp. 312-324.
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Pocket formation and behavior in turbulent premixed flames. / Tyagi, Ankit; Boxx, Isaac; Peluso, Stephen; O'Connor, Jacqueline.

In: Combustion and Flame, Vol. 211, 01.2020, p. 312-324.

Research output: Contribution to journalArticle

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T1 - Pocket formation and behavior in turbulent premixed flames

AU - Tyagi, Ankit

AU - Boxx, Isaac

AU - Peluso, Stephen

AU - O'Connor, Jacqueline

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AB - Pocket formation is an important characteristic of turbulent premixed flames and understanding pocket behavior is key to developing high-fidelity numerical combustion models. In this study, a dual-burner experiment is used to study pockets in single- and dual-flame configurations and synchronized high-speed OH-planar laser-induced fluorescence and stereoscopic-particle image velocimetry imaging techniques are implemented to track flame pockets and the surrounding flow field. Statistical analysis of pocket origin and fate is performed using a novel tracking algorithm incorporating non-rigid image registration. Results show that pocket formation rates increase as a function of increasing inlet turbulence level; reactant pocket formation increases as a function of downstream distance, whereas product pocket formation decreases. Tracking reactant pocket lifetime shows that a majority of these pockets burn out and displacement speeds are characterized. Product pockets usually merge with the main flame surface, which could have an impact on local flame structure and propagation. Results presented in this study show that pocket behavior in turbulent flames can change local flame dynamics and it is important to capture these effects in sub-grid scale combustion models to accurately predict flame behavior.

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