Affiliations: Department of Mechanical and Aerospace Engineering,
North Carolina State University, Box 7910, Raleigh, NC 27695-7910, USA. | Air Force Research Laboratory, Wright-Patterson Air
Force Base, OH 45433-7103, USA. | Innovative Scientific Solutions, Inc., 2786 Indian
Ripple Road, Dayton, OH 45440-3696, USA.
Abstract: The stabilization of lifted jet diffusion flames has long been a
topic of interest to combustion researchers. The flame and flow morphology, the
role of partial premixing, and the effects of large scale structures on the
flame can be visualized through advanced optical imaging techniques. Many of
the current explanations for flame stabilization can benefit from the flow and
flame information provided by laser diagnostics. Additionally, the images
acquired from laser diagnostic experiments reveal features invisible to the eye
and line-of-sight techniques, thereby allowing a deeper insight into flame
stabilization. This paper reports visualizations of flame and flow structures
from Particle Image Velocimetry (PIV), Planar Laser-Induced Fluorescence (PLIF)
and Rayleigh scattering. The techniques are surveyed and the success of
visualization techniques in clarifying and furthering the understanding of
lifted-jet flame stabilization is discussed.