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

Sanjin Saric
Technische Universität Darmstadt, Department of Mechanical Engineering, Chair of Fluid Mechanics and Aerodynamics, Darmstadt, Germany,

Bjorn Kniesner
Fachgebiet Stromungslehre und Aerodynamik, Technische Universitat Darmstadt Petersenstr. 30, D-64287 Darmstadt, Germany

Paul Altenhofer
Fachgebiet Stromungslehre und Aerodynamik, Technische Universitat Darmstadt Petersenstr. 30, D-64287 Darmstadt, Germany

Suad Jakirlic
Department of Mechanical Engineering Institute of Fluid Mechanics and Aerodynamics (SLA) / Center of Smart Interfaces (CSI) Technische Universitat Darmstadt Petersenstrasse 17, D-64287 Darmstadt, Germany

Cameron Tropea
Technische Universität Darmstadt, Institute of Fluid Mechanics and Aerodynamics, Center of Smart Interfaces, International Research Training Group Darmstadt-Tokyo on Mathematical Fluid Dynamics, Germany

Dalibor Cavar
Fluid Mechanics Section, Department of Mechanical Engineering, Technical University of Denmark Nils Koppels Alee 403, 2800 Kgs. Lyngby, Denmark

Branislav Basara
AVL LIST GmbH, Advanced Simulation Technologies, Hans List Platz 1, 8020 Graz, Austria

Abstrakt

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.