Two-dimensional flashback simulation in strongly swirling flows

Frank Kiesewetter, Christoph Hirsch, Jassin Fritz, Martin Kröner, Thomas Sattelmayer

Publikation: KonferenzbeitragPapierBegutachtung

39 Zitate (Scopus)

Abstract

In lean premised swirl stabilized gas turbine combustors a common burner design goal is to obtain lowest NOx-emissions by increasing the mixing length without deterioration of the burner reliability. In these burners flame flashback from the combustion zone into the mixing zone leading to thermal overload and subsequent rapid destruction of the burners must be avoided under all operating conditions. In previous experimental studies (Fritz et al. 2001, Kröner et al. 2002) a new phenomenon, the combustion induced vortex breakdown (CIVB), has been identified as the predominant cause for flashback in swirl stabilized burners. The current work aims at providing a theoretical analysis of this phenomenon as well as tools for the investigation of arbitrary geometries on the basis of a URANS-CFD model. A two-dimensional axialsymmetric model has been developed, which allows to include the computation of the upstream flow path as well as the swirl generator. Following this strategy, the specification of predetermined velocities at the swirler inlet which become unphysical during flashback can be avoided. As the benefit, a much better simulation of the transient flame propagation process is obtained. Comparisons of the numerical results obtained so far with the experiments from the previous studies reveal that the two-dimensional model accurately captures the essential features of the process although the reacting flow exhibits a three-dimensional structure during flashback in reality.

OriginalspracheEnglisch
Seiten293-300
Seitenumfang8
DOIs
PublikationsstatusVeröffentlicht - 2003
Veranstaltung2003 ASME Turbo Expo - Atlanta, GA, USA/Vereinigte Staaten
Dauer: 16 Juni 200319 Juni 2003

Konferenz

Konferenz2003 ASME Turbo Expo
Land/GebietUSA/Vereinigte Staaten
OrtAtlanta, GA
Zeitraum16/06/0319/06/03

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