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Investigation of the isothermal flow inside a new combustor with two-stage axial swirler
Author(s): ping wang, xiangyu wei, Prashant Shrotriya, weichao li, Antonio Ferrante
Keywords: Double swirl; Particle Image Velocimetry; Large eddy simulation; Coherent structure; Vortex breakdown
Experiments and numerical simulations are performed to study the cold flow field characteristics in a two-stage axial swirl combustion chamber. Large eddy simulation with dynamic turbulent kinetic energy sub-grid scale model is used to calculate the flow field, and particle image velocimetry is used to measure the turbulent flow field. The calculated results are found to be in a good agreement with the experiment results. Due to the shear layers and the density difference between CO2 and air flows, the central recirculation zone appears. With the variation of the ratio of flow velocity between inner and outer tubes, the recirculation zone changes. The vortex structure develops in the axial and radial directions, and the collapse of vortex structure mostly occurs in the upstream regions. However, outside the central recirculation zone, only one shear layer is observed, and its vortex structure is almost extended up to the exit of the combustion chamber. In addition, precession vortex core is not seen in all the conditions.

Journal of Applied Fluid Mechanics

The Journal of Applied Fluid Mechanics (JAFM) is an international, peer-reviewed journal which covers a wide range of theoretical, numerical and experimental aspects in fluid mechanics. The emphasis is on the applications in different engineering fields rather than on pure mathematical or physical aspects in fluid mechanics. Although many high quality journals pertaining to different aspects of fluid mechanics presently exist, research in the field is rapidly escalating.