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A detailed investigation of the stabilization point of lifted turbulent diffusion flames

Authors
Journal
Symposium (International) on Combustion
0082-0784
Publisher
Elsevier
Publication Date
Volume
27
Issue
1
Identifiers
DOI: 10.1016/s0082-0784(98)80518-3

Abstract

The stabilization point of lifted turbulent hydrogen diffusion flames is investigated by Raman/Rayleigh/laser-induced fluorescence (LIF) spectroscopy. The stabilization point is determined from simultaneously taken planar laser-induced fluorescence (PLIF) images. It is shown from averaged statistics that lift-off height has negligible influence on the flame length and the far region of the jet. Reactants, premixed downstream of the stabilization point, are rapidly consumed over a very short distance. A new method to generate stabilization point conditioned species and temperature data is proposed and applied to the data. With this method it is possible to describe the surrounding of an observer located at the instantaneous stabilization point. The data are presented by constant contour plots of mixture fraction, species, and temperature in a stabilization point fixed coordinate system. The data obtained by this method are used to assess previously proposed theories on the behavior of lifted turbulent diffusion flames. Experimental findings presented are inconsistent with predictions by the concept of premixed flame stabilization as well as with the flamelet concept. The insensitivity of the spatial location of the stabilization point to the variation of the stoichiometric mixture fraction of the fuels investigated suggests a stabilization mechanism through large-scale turbulent structures. Large-scale structures also explain the existence of products upstream of the stabilization point. The conclusion of this analysis is that large-scale turbulent structures play a dominant role in the stabilization mechanisms of the lifted turbulent diffusion flames, subject to this study.

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