Journal
FLOW TURBULENCE AND COMBUSTION
Volume 99, Issue 2, Pages 487-509Publisher
SPRINGER
DOI: 10.1007/s10494-017-9822-1
Keywords
Turbulent premixed combustion; Flame-turbulence interactions; Bluff-body flames; Flame-generated vorticity; Flame structural dynamics; Baroclinic torque
Categories
Funding
- Office of Naval Research [N00014-06-1-0498]
- Air Force Office of Scientific Research [FA9550-16-1-0403]
- National Defense Education Program for the Science, Mathematics & Research for Transformation (SMART)
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This investigation considers the dynamics of flame-generated vorticity for a premixed, submerged bluff-body stabilized flame. Experimentation characterizes the far-field region in particular with a level of detail not previously afforded to this type of flow. Simultaneous particle imaging velocimetry (PIV), Mie scattering and CH (au) chemiluminescence are used to obtain velocity fields and flame location. Mean static pressure measurements at the combustion chamber wall capture the pressure field. Analysis of the flame fronts in relation to the mean velocity and vorticity fields provides useful insight into the interaction of the flame and the flow. The unique nature of the velocity and vorticity fields and their effect on downstream flame structures are explained by the baroclinic torque generation of vorticity. The coupling that exists among pressure, heat release, and baroclinic generation is acknowledged and will influence strategies for control of the baroclinic mechanism.
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