Large eddy simulations (LES) of turbulent isothermal swirling flows have been investigated. The Sydney swirl burner configuration has been used for all simulated test cases from a low to a high swirl and Reynolds numbers. Four test cases based on different swirl numbers have been considered and the influence of the swirl number for producing recirculation, vortex breakdown, precession vortex core and the precession frequencies have been investigated. The governing equations for the continuity and momentum are solved on a structured Cartesian grid, and a Smagorinsky eddy viscosity model with the localised dynamic procedure is used as the subgrid scale turbulence model. The results show that the LES successfully predicts both the upstream first recirculation zone generated by the bluff body and the downstream vortex breakdown bubble (VBB) induced by swirl. The plots reveal that the expansion of the upstream recirculation zone is almost similar for each test case. LES results revealed that the increasing swirl number affect to form the VBB in the downstream region, however it promotes the shear layer instability in the recirculation zones. The frequency spectrums indicate the presence of low frequency oscillations and the existence of a central jet precession. Results demonstrated distinct precession frequencies at the considered spatial jet locator and agreed well with the experimental values. The results also highlight the formation of a precessing vortex core (PVC).
Skip Nav Destination
ASME Turbo Expo 2009: Power for Land, Sea, and Air
June 8–12, 2009
Orlando, Florida, USA
Conference Sponsors:
- International Gas Turbine Institute
ISBN:
978-0-7918-4883-8
PROCEEDINGS PAPER
LES of Turbulent Swirling Jets: Study of Jet Precession, Recirculation and Vortex Breakdown Available to Purchase
Ranga Dinesh,
Ranga Dinesh
Cranfield University, Cranfield, Bedford, UK
Search for other works by this author on:
Karl Jenkins,
Karl Jenkins
Cranfield University, Cranfield, Bedford, UK
Search for other works by this author on:
Michael Kirkpatrick
Michael Kirkpatrick
The University of Sydney, Sydney, Australia
Search for other works by this author on:
Ranga Dinesh
Cranfield University, Cranfield, Bedford, UK
Karl Jenkins
Cranfield University, Cranfield, Bedford, UK
Michael Kirkpatrick
The University of Sydney, Sydney, Australia
Paper No:
GT2009-59386, pp. 309-315; 7 pages
Published Online:
February 16, 2010
Citation
Dinesh, R, Jenkins, K, & Kirkpatrick, M. "LES of Turbulent Swirling Jets: Study of Jet Precession, Recirculation and Vortex Breakdown." Proceedings of the ASME Turbo Expo 2009: Power for Land, Sea, and Air. Volume 2: Combustion, Fuels and Emissions. Orlando, Florida, USA. June 8–12, 2009. pp. 309-315. ASME. https://doi.org/10.1115/GT2009-59386
Download citation file:
20
Views
Related Proceedings Papers
Related Articles
Statistical Properties of Round, Square, and Elliptic Jets at Low and Moderate Reynolds Numbers
J. Fluids Eng (October,2017)
Calculation of High-Lift Cascades in Low Pressure Turbine Conditions Using a Three-Equation Model
J. Turbomach (July,2011)
Numerical Analysis of Sweeping Jets for Active Flow Control Application
J. Fluids Eng (March,2020)
Related Chapters
Cavitating Structures at Inception in Turbulent Shear Flow
Proceedings of the 10th International Symposium on Cavitation (CAV2018)
On the Influence of Eddy Viscosity in the Numerical Modelling of Air Cavities
Proceedings of the 10th International Symposium on Cavitation (CAV2018)
Large Eddy Simulation of a Collapsing Vapor Bubble Containing Non-Condensable Gas
Proceedings of the 10th International Symposium on Cavitation (CAV2018)