Experimental and numerical study of extinction in negative edge laminar flames

Date of Completion

January 2006

Keywords

Engineering, Mechanical

Degree

Ph.D.

Abstract

In order to facilitate research into flame hole dynamics, a stable negative edge flame was created in a simplified burner geometry. This flame represents the unsteady recession portion of flame hole growth in a stable environment allowing detailed investigation of an extinction phenomenon for the first time. Initial measurements focused upon characterization of the burner as well as flame structure, including concentration and strain field influences upon the negative edge. From these initial measurements an improved burner was designed. ^ Numerical simulations of the flame were performed resulting in a detailed understanding of the effect that heat advection through the extinction point has on the scalar dissipation rate relationship to edge velocity. Additional experimental investigations including spontaneous Raman scattering measurements of the temperature field surrounding the extinction point, as well as OH/CH 2O planar laser induced florescence measurements for imaging reaction rate were conducted. These measurements serve as benchmark data for comparison to detailed simulations as well as a powerful demonstration of the utility this flame has in extinction kinetics studies.^

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