Experiments in Fluids

, Volume 40, Issue 2, pp 267–276 | Cite as

Coherent structures in unsteady swirling jet flow

  • C. E. Cala
  • E. C. Fernandes
  • M. V. Heitor
  • S. I. Shtork
Research Article


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.


Vortex Vorticity Nozzle Exit Vortical Structure Secondary Vortex 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.



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.


  1. Al-Abdeli YM, Masri AR (2004) Precession and recirculation in turbulent swirling isothermal jets. Combust Sci Technol 176:645–665CrossRefGoogle Scholar
  2. Alekseenko SV, Kuibin PA, Okulov VL, Shtork SI (1999) Helical vortices in swirl flow. J Fluid Mech 382:195–243zbMATHCrossRefMathSciNetGoogle Scholar
  3. Alekseenko SV, Shtork SI (1995) Experimental study of vortex breakdown in intensively swirling flows. In: EUROMECH colloquium N 336 on flows dominated by centrifugal and Coriolis forces, Trondheim, NorwayGoogle Scholar
  4. Althaus W, Brücker C, Weimer M (1995) Breakdown of slender vortices. In: Green S (ed) Fluid vortices. Kluwer Academic Publishers, pp 373–426Google Scholar
  5. Anacleto PM, Fernandes EC, Heitor MV, Shtork SI (2003) Swirl flow structure and flame characteristics in a model lean premixed combustor. Combust Sci Technol 175(8):1369–1388CrossRefGoogle Scholar
  6. Billant P, Chomaz J-M, Huerre P (1998) Experimental study of vortex breakdown in swirling jets. J Fluid Mech 376:183–219zbMATHCrossRefMathSciNetGoogle Scholar
  7. Chanaud RC (1965) Observations of oscillatory motion in certain swirling flows. J Fluid Mech 21:11–127CrossRefGoogle Scholar
  8. Derksen J, Van den Akker HEA (2000) Simulation of vortex core precession in a reverse-flow cyclone. AIChE J 46(7):1317–1331CrossRefGoogle Scholar
  9. Escudier MP (1988) Vortex breakdown: observations and explanations. Prog Aerosp Sci 25:189–229CrossRefGoogle Scholar
  10. Fernandes EC (1998) The onset of combustion-driven acoustic oscillations. Ph.D. thesis, Instituto Superior TécnicoGoogle Scholar
  11. Froud D, O’Doherty T, Syred N (1995) Phase averaging of the precessing vortex core in a swirl burner under piloted and premixed combustion conditions. Combust Flame 100:407–412CrossRefGoogle Scholar
  12. Gallaire F, Chomaz J-M (2003a) Instability mechanisms in swirling flows. Phys Fluids 15(9):2622–2639CrossRefMathSciNetGoogle Scholar
  13. Gallaire F, Chomaz J-M (2003b) Mode selection in swirling jet experiments: a linear stability analysis. J Fluid Mech 494:223–253zbMATHCrossRefMathSciNetGoogle Scholar
  14. Gallaire F, Rott S, Chomaz J-M (2004) Experimental study of a free and forced swirling jet. Phys Fluids 16(8):2907–2917CrossRefGoogle Scholar
  15. Galletti C, Paglianti A, Lee KC, Yianneskis M (2004) Reynolds number and impeller diameter effects on instabilities in stirred vessels. AIChE J 50(9):2050–2063CrossRefGoogle Scholar
  16. Goto S, Kida S (2003) Enhanced stretching of material lines by antiparallel vortex pairs in turbulence. Fluid Dyn Res 33:403–431zbMATHCrossRefMathSciNetGoogle Scholar
  17. Griffiths AJ, Yazdabadi PA, Syred N (1998) Alternate eddy shedding set up by the nonaxisymmetric recirculation zone at the exhaust of a cyclone dust separator. J Fluids Eng 120(1):193–199Google Scholar
  18. Grosjean N, Graftieaux L, Michard M, Hübner W, Tropea C, Volkert J (1997) Combining LDA, PIV for turbulence measurements in unsteady swirling flows. Meas Sci Technol 8:1523–1532CrossRefGoogle Scholar
  19. Hartmann H, Derksen JJ, Van den Akker HEA (2004) Macroinstability uncovered in a rushton turbine stirred tank by means of LES. AIChE J 50(10):2383–2393CrossRefGoogle Scholar
  20. Heitor MV, Moreira ALN (1992) Velocity characteristics of a swirling recirculating flow. Exp Therm Fluid Sci 5:369–380CrossRefGoogle Scholar
  21. Heitor MV, Whitelaw JH (1986) Velocity, temperature, and species characteristics of the flow in a gas-turbine combustor. Combust Flame 64:1–32CrossRefGoogle Scholar
  22. Huang Y, Sung H-G, Hsieh S-Y, Yang V (2003) Large-eddy simulation of combustion dynamics of lean-premixed swirl-stabilized combustor. J Propul Power 19(5):782–794Google Scholar
  23. Jeong J, Hussain F (1995) On the identification of a vortex. J Fluid Mech 285:69–94zbMATHCrossRefMathSciNetGoogle Scholar
  24. Jiang M, Machiraju R, Thompson DS (2003) In: Johnson CR, Hansen CD (eds) Detection and visualization of vortices, visualization handbook. Academic, LondonGoogle Scholar
  25. Kollmann W, Ooi ASH, Chong MS, Soria J (2001) Direct numerical simulations of vortex breakdown in swirling jets. J Turb 2-005 (
  26. Labbé R, Pinton J-F, Fauve S (1996) Study of the von Karman flow between coaxial corotating disks. Phys Fluids 8(4):914–922CrossRefGoogle Scholar
  27. Levy Y, Degani D, Seginer A (1990) Graphical visualization of vortical flows by means of helicity. AIAA J 28(8):1347–1352CrossRefGoogle Scholar
  28. Liang H, Maxworthy T (2005) An experimental investigation of swirling jets. J Fluid Mech 525:115–159zbMATHCrossRefGoogle Scholar
  29. Loiseleux T, Chomaz J-M (2003) Breaking of rotational symmetry in a swirling jet experiment. Phys Fluids 15(2):511–523CrossRefMathSciNetGoogle Scholar
  30. Lucca-Negro O, O’Doherty T (2001) Vortex breakdown: a review. Prog Energy Combust Sc 27:431–481CrossRefGoogle Scholar
  31. Meunier P, Leweke T (2001) Three-dimensional instability during vortex merging. Phys Fluids 13(10):2747–2750CrossRefGoogle Scholar
  32. Montgomery MT, Vladimirov VA, Denisenko PV (2002) An experimental study on hurricane mesovortices. J Fluid Mech 471:1–32zbMATHCrossRefGoogle Scholar
  33. Nicolet C, Arpe J, Avellan F (2004) Identification and modeling of pressure fluctuations of a francis turbine scale model at part load operation. In: 22nd IAHR symposium on hydraulic machinery and systems, Stockholm, SwedenGoogle Scholar
  34. Okulov VL, Fukumoto Y (2004) Helical Dipole. Doklady Phys 49(11):662–667CrossRefGoogle Scholar
  35. Panda J, McLaughlin DK (1994) Experiments on the instabilities of a swirling jet. Phys Fluids 6(1):263–276CrossRefGoogle Scholar
  36. Ruith MR, Chen P, Meiburg E, Maxworthy T (2003) Three-dimensional vortex breakdown in swirling jets and wakes: direct numerical simulation. J Fluid Mech 486:331–378zbMATHCrossRefMathSciNetGoogle Scholar
  37. Schram C, Rambaud P, Riethmuller ML (2004) Wavelet based eddy structure eduction from a backward facing step flow investigated using particle image velocimetry. Exp Fluids 36:233–245CrossRefGoogle Scholar
  38. Selle L, Lartigue G, Poinsot T, Koch R, Schildmacher K-U, Krebs W, Prade B, Kaufmann P, Veynante D (2004) Compressible large eddy simulation of turbulent combustion in complex geometry on unstructured meshes. Combust Flame 137:489–505CrossRefGoogle Scholar
  39. Syred N, Beer JM (1972) The damping of precessing vortex cores by combustion in swirl generators. Astronautica Acta 17:783–801Google Scholar
  40. Syred N, Wong C, Rodriquez-Martinez V, Dawson J, Kelso R (2004) Characterisation of the occurrence of the precessing vortex core in partially premixed and non-premixed swirling flow. In: Proceedings of the 12th international symposium on applications of laser techniques to fluid mechanics, LisbonGoogle Scholar
  41. Vonnegut B (1954) A vortex whistle. J Acoust Soc Am 26:18–20CrossRefGoogle Scholar
  42. Wang P, Bai XS, Wessman M, Klingmann J (2004) Large eddy simulation and experimental studies of a confined turbulent swirling flow. Phys Fluids 16(9):3306–3324CrossRefGoogle Scholar
  43. Wegner B, Maltsev A, Schneider C, Sadiki A, Dreizler A, Janicka J (2004) Assessment of unsteady RANS in predicting swirl flow instability based on LES and experiments. Int J Heat Fluid Flow 25:528–536CrossRefGoogle Scholar

Copyright information

© Springer-Verlag 2005

Authors and Affiliations

  • C. E. Cala
    • 1
  • E. C. Fernandes
    • 1
  • M. V. Heitor
    • 1
  • S. I. Shtork
    • 1
    • 2
  1. 1.Laboratory of Thermofluids, Combustion and Energy Systems, Center for Innovation, Technology and Policy Research IN+, Department of Mechanical EngineeringInstituto Superior TécnicoLisbonPortugal
  2. 2.Institute of Thermophysics SB RASNovosibirskRussia

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