Structure of Flames in Flame Interaction Zones

Tyagi, Ankit; Boxx, Isaac; Peluso, Stephen; Shupp, Ryan; O’Connor, Jacqueline

doi:10.2514/6.2018-0161

Cited by 3 publications

(2 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Changes from dual-flame to single-flame configuration can be made in this experiment by attaching the back-support pilot flame of one burner as a secondary pilot to the other burner. More details on the burner dimensions can be found in our previous work [1,18,19]. The test matrix used in this study is a subset of the datasets used in a previous study; definitions of each of the operational parameters can be found in Ref.…”

Section: Burner Configurationmentioning

confidence: 99%

Pocket formation and behavior in turbulent premixed flames

Tyagi

Boxx

Peluso

et al. 2020

Combustion and Flame

Self Cite

View full text Add to dashboard Cite

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.

show abstract

Section: Burner Configurationmentioning

confidence: 99%

Pocket formation and behavior in turbulent premixed flames

Tyagi

Boxx

Peluso

et al. 2020

Combustion and Flame

Self Cite

View full text Add to dashboard Cite

show abstract

“…The perforated plates have a hole diameter of 3.18 mm and an open area of 40%, resulting in the generation of averaged non-reacting flow turbulence-intensities of 18%. More details of the burner are described in [48]. Each burner design also includes two types of pilot flames: small "anchoring" pilots, which are located close to the exit of the burners and help anchor the flames on the experiment, and larger "back-support" pilots, which provide adiabatic or super-adiabatic combustion products around the flames; however, pilot flames are not used in the current study.…”

Section: A Burner Configurationsmentioning

confidence: 99%

Statistics of Local Flame-Flame Interactions in Flame Interaction Zones of Two V-Flames

Tyagi

Boxx

Peluso

et al. 2019

AIAA Scitech 2019 Forum

Self Cite

View full text Add to dashboard Cite

The flame structure and dynamics of interacting turbulent premixed flames are dependent on interactions between the flow fields and scalar fields of individual flames. Studies have shown that local flame-flame interactions introduce a variety of effects on flame structure and propagation by changing the statistics of flame curvature, displacement speed, flame area fluctuations, and stretch-rates. The topology of interaction events can vary significantly in the interaction zones of turbulent flames. These interactions can also result in the formation of unburned and burned gas pockets. Understanding the behavior of these interaction events is of important to capture the destruction of the flame surface to develop better sub-grid scale turbulent combustion models for enhancing the design and operation of modern combustion devices. The goal of this study is to characterize the behavior of two interacting V-flames and the local flame-flame interaction characteristics in their interaction zones. High-speed OHplanar laser-induced fluorescence (OH-PLIF) is implemented to obtain instantaneous flame front locations of rod-stabilized V-flames in a dual-burner experiment. A non-rigid image registration technique is applied to flame images to track the topological changes occurring in small time steps. In particular, results are presented for the dynamics of the interaction zones of these flames to illustrate that large-scale oscillations are important in the occurrence of small-scale flame-flame interactions. Lower arrival frequencies for flame-flame interactions are widely distributed along the streamwise direction, connecting the large-scale global behavior to the sub-grid level behavior of turbulent V-flames.

show abstract