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Fifth International Symposium on Turbulence and Shear Flow Phenomena
August, 27-29, 2007, Technische Universität München, Munich, Germany

DOI: 10.1615/TSFP5

SWIRL INTENSITY INFLUENCE ON INTERACTION BETWEEN NON-SWIRLING AND SWIRLING CO-AXIAL JETS IN A COMBUSTOR CONFIGURATION: LES AND MODELLING STUDY

pages 911-916
DOI: 10.1615/TSFP5.1430
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RESUMO

Structural characterization of flow and turbulence in the model of a tubo-annular combustion chamber is investigated computationally using LES (Large Eddy Simulation) method and the ζ − ƒ RANS (Reynolds-averaged Navier-Stokes) model of Hanjalic et al. (2004). The latter model, representing a robust eddy-viscosity-based model of turbulence, is used in conjunction with the universal wall treatment combining the integration up to the wall and wall functions. Reference LDA (inlet section including central and annular pipes) and PIV (combustor) measurements were performed by Palm (2006). The focus of the investigation was on the swirl intensity influence on the interaction between central non-swirling stream and a swirling co-axial jet issuing from an annular inlet section in the near-field of the flue. The results obtained demonstrate gradual expansion of the free flow reversal zone into the radial direction with corner (wall-bounded) bubble being substantially suppressed. The increasing swirl intensity contributes significantly to the intensification of the radial movement associated with strong turbulence level increase in the region of the swirling shear layer, thus promoting the mixing.

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