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Coherent structures in unsteady swirling jet flow

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Abstract

An LDA technique and phase-averaging analysis were used to study unsteady precessing flow in a model vortex burner. Detailed measurements were made for Re=15,000 and S=1.01. On the basis of the analysis of phase-averaged data and vortex detection by the λ2-technique of Joeng and Hussain (1995), three precessing spiral vortex structures were identified: primary vortex (PV), inner secondary vortex (ISV), and outer secondary vortex (OSV). The PV is the primary and most powerful structure as it includes primary vorticity generated by the swirler; the ISV and OSV are considered here as secondary vortical structures. The jet breakdown zone is the conjunction of a pair of co-rotating co-winding spiral vortices, PV and ISV. The interesting new feature described is that the secondary vortices form a three-dimensional vortex dipole with a helical geometry. The effect of coupling of secondary vortices was suggested as a mechanism of enhanced stability reflected in their increased axial extent.

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Acknowledgements

The authors are pleased to acknowledge support from the Portuguese Science and Technology Foundation (through Research Grant POCTI/34768/EME/1999 and Research Fellowship SFRH/BPD/1641/2000 provided for S.I. Shtork). The help of Mr. Eduardo Bimba in assembling the experimental setup is also gratefully appreciated.

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  1. S. I. Shtork

    Present address: Institute of Thermophysics SB RAS, 630090, Novosibirsk, Russia

Authors and Affiliations

  1. Laboratory of Thermofluids, Combustion and Energy Systems, Center for Innovation, Technology and Policy Research IN+, Department of Mechanical Engineering, Instituto Superior Técnico, Av. Rovisco Pais, 1049-001, Lisbon, Portugal

    C. E. Cala, E. C. Fernandes, M. V. Heitor & S. I. Shtork

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  1. C. E. Cala
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  2. E. C. Fernandes
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  3. M. V. Heitor
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  4. S. I. Shtork
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Correspondence to S. I. Shtork.

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Cala, C.E., Fernandes, E.C., Heitor, M.V. et al. Coherent structures in unsteady swirling jet flow. Exp Fluids 40, 267–276 (2006). https://doi.org/10.1007/s00348-005-0066-9

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  • DOI: https://doi.org/10.1007/s00348-005-0066-9

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