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Numerical Study of Flow Through 3x3 Multiswirler Arrays With Co and Counter Swirler Arrangements

[+] Author Affiliations
Prachi Rojatkar, Milind A. Jog, San-Mou Jeng

University of Cincinnati, Cincinnati, OH

Paper No. GT2015-43616, pp. V04BT04A045; 9 pages
doi:10.1115/GT2015-43616
From:
  • ASME Turbo Expo 2015: Turbine Technical Conference and Exposition
  • Volume 4B: Combustion, Fuels and Emissions
  • Montreal, Quebec, Canada, June 15–19, 2015
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-5669-7
  • Copyright © 2015 by ASME

abstract

A numerical study of turbulent flow through 3×3 multi swirler arrangement has been performed using the realizable k-ε turbulence model on a grid with about 19 million points. All co and alternate co/counter swirler configurations comprised of radial-radial swirler with counter rotating vanes are analyzed. The offset distances of swirler exit from the base wall of confinement of 0.02D and 0.31D are considered where D is the diameter of swirler exit. For both arrangements, a strong jet is issued as the flow exits individual swirl cup. Recirculation is observed at the walls and between each swirl cup along with the formation of central toroidal recirculation zone (CTRZ) at each individual swirler. It is observed that all co swirling arrangement has a stronger more compact individual CTRZ. On the other hand alternate co and counter arrangement produces more swirler-to-swirler interactions. When the offset between swirler exit and base wall of confinement is increased to 0.31D, longer but more compact CTRZ are formed at each swirler cup. The velocity gradient for 0.31D offset case is also higher than that of 0.02D. These differences in the flow field indicate better combustion performance, fuel breakup and flame anchoring for the higher offset case.

Copyright © 2015 by ASME
Topics: Flow (Dynamics)

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