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

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Mechanical Engineering Department

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Stephan Kruse; Mohy S. Mansour; Ayman M. Elbaz; Emilien Varea; Gerd Grünefeld; Joachim Beeckmann; Heinz Pitsch

Document Type

Research Article

Publication Title

Combustion Science and Technology

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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.

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