On the Flame-generated Vorticity Dynamics of Bluff-body-stabilized Premixed Flames

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 velocimetr...

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Bibliographic Details
Published in:Flow, turbulence and combustion turbulence and combustion, 2017-09, Vol.99 (2), p.487-509
Main Authors: Geikie, Marissa K., Carr, Zakery R., A. Ahmed, Kareem, Forliti, David J.
Format: Article
Language:English
Subjects:
Automotive Engineering
Chemiluminescence
Combustion chambers
Downstream effects
Engineering
Engineering Fluid Dynamics
Engineering Thermodynamics
Experimentation
Fluid- and Aerodynamics
Heat and Mass Transfer
Mie scattering
Premixed flames
Static pressure
Velocimetry
Velocity measurement
Vorticity
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Summary: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 ∗ 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.
ISSN:1386-6184
1573-1987
DOI:10.1007/s10494-017-9822-1