Turbulence-Flame Interaction in the Broken Reaction Regime

Geikie, Marissa K.; Morales, Anthony J.; Engelmann, Christian; Ahmed, Kareem A.

doi:10.2514/6.2018-0162

Cited by 4 publications

(4 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…1b. This turbulence generator is based upon designs used within related works [13,[26][27][28][29][30][31]. The design implements a combination of grid-based and fluidic jet impingement methods, allowing for a wide range of turbulent conditions to be achieved.…”

Section: Experimental Setup and Proceduresmentioning

confidence: 99%

See 1 more Smart Citation

The Characteristics of Flame Stability at High Turbulence Conditions in a Bluff-Body Stabilized Combustor

Morales

Lasky

Engelmann

et al. 2019

AIAA Scitech 2019 Forum

Self Cite

View full text Add to dashboard Cite

Flame extinction dynamics are investigated for highly turbulent premixed bluff-body stabilized flames within a blow-down combustion facility. Blowout is induced through the rapid reduction of fuel flow into the reactant mixture. A novel turbulence generator is designed to modulate inflow turbulence levels. The turbulence generator implements both jet impingement and grid-based methods to vary turbulence across a wide range of intensities, including the thin reaction regime and pushing into the broken reaction regime. The effects of the induced turbulence on the extinction event is captured through simultaneous high-speed time-resolved particle imaging velocimetry (PIV) and C * 2-CH * species measurement techniques. Flame structure, flow field, and strain rate analyses are employed to detail the driving mechanisms of blowout under various turbulent inflow conditions. It is demonstrated that with increased turbulence intensities, the strain rate along the flame boundary is attenuated, resulting in longer of extinction timescales and improved flame stability.

show abstract

Section: Experimental Setup and Proceduresmentioning

confidence: 99%

“…During combustion, turbulence effects drastically influence flame stability mechanisms through hydrodynamic modulation [10][11][12][13]. Borghi demonstrated that increased turbulence intensities correspond to greater flame wrinkling [14] thereby increasing the surface area and in turn the turbulent flame speed [15].…”

Section: Introductionmentioning

confidence: 99%

The Characteristics of Flame Stability at High Turbulence Conditions in a Bluff-Body Stabilized Combustor

Morales

Lasky

Engelmann

et al. 2019

AIAA Scitech 2019 Forum

Self Cite

View full text Add to dashboard Cite

show abstract

“…The turbulence generator combines static grid and active fluidic jet impingement methods for a wide range of turbulence modulation. Detailed characteristics of the turbulence generator are documented in previous works [23][24][25][26]. The bluff body is ballistic in design and is vertically centered within the test section.…”

Section: A Experimental Facilitymentioning

confidence: 99%

“…Pressure gradient tailoring will allow for the manipulation of the flow field vorticity dynamics by altering the flame generated baroclinic torque. [15,23,24]. High-speed PIV diagnostics and C 2 *-CH* species measurements allow for the baroclinic torque, as well as other vorticity mechanisms, to be spatially and temporally resolved throughout flame extinction.…”

Section: Introductionmentioning

confidence: 99%