Library Subscription: Guest
TSFP DL Home Archives Executive Committee

EXPERIMENTAL INVESTIGATION AND MODELLING OF FLOW AND TURBULENCE IN A SWIRL COMBUSTOR

R. Palm
Chair of Fluid Mechanics and Aerodynamics, Darmstadt University of Technology Petersenstr. 30, D-64287 Darmstadt, Germany

Sven Grundmann
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

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

Abstract

The interaction between a swirling annular jet and a central, non-swirling stream expanding into a model of a tuboannular combustor was investigated experimentally using Particle Image Velocimetry (PIV) under conditions of variable swirl intensity (0.0<S<1.2) and mass flow rate ratio. Two flow domains in the x − r plane were measured covering the most intense regions of mixing immediately after the sudden expansion. The focus of the investigation was on the swirl intensity influence on the size and shape of the backflow region being generated in the flow core. In addition, the numerical computations of the entire experimental configuration including swirl generator, inlet section and the combustor (flue) itself using a version of the Second-Moment Closure (SMC) model were performed. The results obtained demonstrate gradual expansion of the free recirculation zone into the radial direction with the separation onset shifted upstream towards the combustor entrance under increasing swirl intensity.