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URANS- AND LARGE-EDDY-SIMULATIONS OF COMBUSTION-INDUCED VORTEX BREAKDOWN IN PREMIXED SWIRLING FLOWS

Eike Tangermann
Institut für Mathematik und Rechneranwendung, Universitat der Bundeswehr Munchen Werner-Heisenberg-Weg 39, 85577 Neubiberg, Germany

Michael Pfitzner
Department of Aerospace Engineering, Institute for Thermodynamics, University of the Federal Armed Forces Munich, 85577 Neubiberg, Germany

Abstract

A swirl burner configuration has been investigated using URANS and LES methods. The flow field was analyzed in isothermal non-reactive state as well as in the reactive state including the flame flashback phenomenon. The URANS quasi two-dimensional calculations have been performed using the Lindstedt-Vaos combustion model supplemented with flame quenching models to prevent the flame from propagating along the cold wall. In the LES an artificially thickened flame combustion model was used. The limits of the flashback starting from a stable flame were determined under several operating conditions and compared with experimental results.