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Experiments in Fluids

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01.10.2010 | Research Article

Laser-based investigations in gas turbine model combustors

verfasst von: W. Meier, I. Boxx, M. Stöhr, C. D. Carter

Erschienen in: Experiments in Fluids | Ausgabe 4/2010

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Abstract

Dynamic processes in gas turbine (GT) combustors play a key role in flame stabilization and extinction, combustion instabilities and pollutant formation, and present a challenge for experimental as well as numerical investigations. These phenomena were investigated in two gas turbine model combustors for premixed and partially premixed CH₄/air swirl flames at atmospheric pressure. Optical access through large quartz windows enabled the application of laser Raman scattering, planar laser-induced fluorescence (PLIF) of OH, particle image velocimetry (PIV) at repetition rates up to 10 kHz and the simultaneous application of OH PLIF and PIV at a repetition rate of 5 kHz. Effects of unmixedness and reaction progress in lean premixed GT flames were revealed and quantified by Raman scattering. In a thermo-acoustically unstable flame, the cyclic variation in mixture fraction and its role for the feedback mechanism of the instability are addressed. In a partially premixed oscillating swirl flame, the cyclic variations of the heat release and the flow field were characterized by chemiluminescence imaging and PIV, respectively. Using phase-correlated Raman scattering measurements, significant phase-dependent variations of the mixture fraction and fuel distributions were revealed. The flame structures and the shape of the reaction zones were visualized by planar imaging of OH distribution. The simultaneous OH PLIF/PIV high-speed measurements revealed the time history of the flow field–flame interaction and demonstrated the development of a local flame extinction event. Further, the influence of a precessing vortex core on the flame topology and its dynamics is discussed.

Vorheriger Artikel Experimental analysis of flashback in lean premixed swirling flames: upstream flame propagation

Nächster Artikel Spatial resolution of a chemiluminescence sensor for local heat-release rate and equivalence ratio measurements in a model gas turbine combustor

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Titel: Laser-based investigations in gas turbine model combustors
verfasst von: W. Meier
I. Boxx
M. Stöhr
C. D. Carter
Publikationsdatum: 01.10.2010
Verlag: Springer-Verlag
Erschienen in: Experiments in Fluids / Ausgabe 4/2010
Print ISSN: 0723-4864
Elektronische ISSN: 1432-1114
DOI: https://doi.org/10.1007/s00348-010-0889-x

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