Evaluation of partially premixed turbulent flame stability from mixture fraction statistics in a slot burner

Partially premixed combustion is characterized by mixture fraction inhomogeneity upstream of the reaction zone and occurs in many applied combustion systems. The temporal and spatial fluctuations of the mixture fraction have tremendous impact on the combustion characteristics, emission formation, an...

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Bibliographic Details
Published in:Combustion science and technology 2023-05, Vol.195 (7), p.1-17
Main Authors: Kruse, Stephan, Mansour, Mohy S., Elbaz, Ayman M., Varea, Emilien, Grünefeld, Gerd, Beeckmann, Joachim, Pitsch, Heinz
Format: Article
Language:English
Subjects:
Combustion
Emission analysis
Equivalence ratio
Flame stability
Fluid flow
Gas composition
Inhomogeneity
line-Raman measurement
Mixtures
Partially premixed flame
Physics
Premixed flames
Raman spectra
Rayleigh measurements
Reynolds number
Stability analysis
turbulent combustion
Turbulent flames
turbulent slot burner
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Summary:Partially premixed combustion is characterized by mixture fraction inhomogeneity upstream of the reaction zone and occurs in many applied combustion systems. The temporal and spatial fluctuations of the mixture fraction have tremendous impact on the combustion characteristics, emission formation, and flame stability. In this study, turbulent partially premixed flames are experimentally studied in a slot burner configuration. The local temperature and gas composition is determined by means of one-dimensional, simultaneous detection of Rayleigh and Raman scattering. The statistics of the mixture fraction are utilized to characterize the impact of the Reynolds number, the global equivalence ratio, the progress of mixing within the flame, as well as the mixing length on the mixing field. Furthermore, these effects are evaluated by means of a regime diagram for partially premixed flames. In this study, it is shown that the increase of the mixing length results in a significantly more stable flame. The impact of the Reynolds number on flame stability is found to be minor.
ISSN:0010-2202
1563-521X
DOI:10.1080/00102202.2018.1452393