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Numerical modelling of flow pattern for high swirling flows

Parra, Teresa; Perez, J. R.; Szász, Robert-Zoltán LU ; Rodriguez, M. A. and Castro, F. (2015) 9th International Conference on Experimental Fluid Mechanics In Efm14 - Experimental Fluid Mechanics 2014 92. p.02059-02059
Abstract
This work focuses on the interaction of two coaxial swirling jets. High swirl burners are suitable for lean flames and produce low emissions. Computational Fluid Dynamics has been used to study the isothermal behaviour of two confined jets whose setup and operating conditions are those of the benchmark of Roback and Johnson. Numerical model is a Total Variation Diminishing and PISO is used to pressure velocity coupling. Transient analysis let identify the non-axisymmetric region of reverse flow. The center of instantaneous azimuthal velocities is not located in the axis of the chamber. The temporal sampling evidences this center spins around the axis of the device forming the precessing vortex core (PVC) whose Strouhal numbers are more... (More)
This work focuses on the interaction of two coaxial swirling jets. High swirl burners are suitable for lean flames and produce low emissions. Computational Fluid Dynamics has been used to study the isothermal behaviour of two confined jets whose setup and operating conditions are those of the benchmark of Roback and Johnson. Numerical model is a Total Variation Diminishing and PISO is used to pressure velocity coupling. Transient analysis let identify the non-axisymmetric region of reverse flow. The center of instantaneous azimuthal velocities is not located in the axis of the chamber. The temporal sampling evidences this center spins around the axis of the device forming the precessing vortex core (PVC) whose Strouhal numbers are more than two for Swirl numbers of one. Influence of swirl number evidences strong swirl numbers are precursor of large vortex breakdown. Influence of conical diffusers evidence the reduction of secondary flows associated to boundary layer separation. (Less)
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author
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
in
Efm14 - Experimental Fluid Mechanics 2014
volume
92
pages
02059 - 02059
publisher
EDP Sciences
conference name
9th International Conference on Experimental Fluid Mechanics
external identifiers
  • wos:000358249900061
  • scopus:84937468682
ISSN
2100-014X
2101-6275
DOI
10.1051/epjconf/20159202059
language
English
LU publication?
yes
id
13b5aa19-6c70-4cd9-9626-2daf7786921a (old id 7779565)
date added to LUP
2015-09-07 13:28:37
date last changed
2017-01-01 03:08:50
@inproceedings{13b5aa19-6c70-4cd9-9626-2daf7786921a,
  abstract     = {This work focuses on the interaction of two coaxial swirling jets. High swirl burners are suitable for lean flames and produce low emissions. Computational Fluid Dynamics has been used to study the isothermal behaviour of two confined jets whose setup and operating conditions are those of the benchmark of Roback and Johnson. Numerical model is a Total Variation Diminishing and PISO is used to pressure velocity coupling. Transient analysis let identify the non-axisymmetric region of reverse flow. The center of instantaneous azimuthal velocities is not located in the axis of the chamber. The temporal sampling evidences this center spins around the axis of the device forming the precessing vortex core (PVC) whose Strouhal numbers are more than two for Swirl numbers of one. Influence of swirl number evidences strong swirl numbers are precursor of large vortex breakdown. Influence of conical diffusers evidence the reduction of secondary flows associated to boundary layer separation.},
  author       = {Parra, Teresa and Perez, J. R. and Szász, Robert-Zoltán and Rodriguez, M. A. and Castro, F.},
  booktitle    = {Efm14 - Experimental Fluid Mechanics 2014},
  issn         = {2100-014X},
  language     = {eng},
  pages        = {02059--02059},
  publisher    = {EDP Sciences},
  title        = {Numerical modelling of flow pattern for high swirling flows},
  url          = {http://dx.doi.org/10.1051/epjconf/20159202059},
  volume       = {92},
  year         = {2015},
}