TY - JOUR
T1 - Pocket formation and behavior in turbulent premixed flames
AU - Tyagi, Ankit
AU - Boxx, Isaac
AU - Peluso, Stephen
AU - O'Connor, Jacqueline
N1 - Funding Information:
This work was supported by the Air Force Office of Scientific Research under Grants FA9550-16-1-0044 and FA9550-16-1-0075 with program manager Dr. Chiping Li. The authors would like to acknowledge Dr. Campbell Carter at the AFRL for providing equipment support for performing these experiments.
Funding Information:
This work was supported by the Air Force Office of Scientific Research under Grants FA9550-16-1-0044 and FA9550-16-1-0075 with program manager Dr. Chiping Li. The authors would like to acknowledge Dr. Campbell Carter at the AFRL for providing equipment support for performing these experiments.
Publisher Copyright:
© 2019
PY - 2020/1
Y1 - 2020/1
N2 - 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.
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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U2 - 10.1016/j.combustflame.2019.09.033
DO - 10.1016/j.combustflame.2019.09.033
M3 - Article
AN - SCOPUS:85073469931
VL - 211
SP - 312
EP - 324
JO - Combustion and Flame
JF - Combustion and Flame
SN - 0010-2180
ER -