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Interaction of lean premixed flame with active grid generated turbulence

  • I. A. Mulla
  • R. Sampath
  • S. R. Chakravarthy
Original
  • 16 Downloads

Abstract

The present work adopts an active turbulence grid (ATG) with an aim to study the interaction of a premixed flame with isotropic turbulence. The ATG allows control over turbulence intensities and integral length scales independent of mean velocity. Active grid generated turbulence is characterized using hot-wire anemometer in a non-reacting flow. A lean V-flame interacting with active grid generated turbulence is investigated. Simultaneous particle image velocimetry and OH-planar laser induced fluorescence are performed to deduce the velocity and the scalar fields, respectively. Proper orthogonal decomposition (POD) is applied to these scalar and the velocity fields. Further, the flame surface density is evaluated to quantify the extent of flame wrinkling. The statistics of tangential strain along the flame front is evaluated as well. The POD shows flapping modes and turbulent fluctuations of the flame. The energetic modes correspond to the flapping modes, whereas the flame dynamics pertaining to the turbulent fluctuations are found in lower energy modes. The mode shapes of the lower energy modes are found to be physically meaningful as they compare well with the instantaneous realizations. The lower energy modes are as important as the energetic modes to capture the complete dynamics. ATG is recommended for combustion studies if the effect of relatively larger integral scales needs to be investigated.

Notes

Acknowledgments

This research was supported by Gas Turbine Enabling Technologies Initiative, and the National Centre for Combustion R&D is supported by the Department of Science and Technology, Government of India.

References

  1. 1.
    Larssen JV, Devenport WJ (2011) On the generation of large-scale homogeneous turbulence. Exp Fluids 50:1207–1223CrossRefGoogle Scholar
  2. 2.
    Andrews GE, Bradley D, Lwakabamba SB (1975) Measurement of turbulent burning velocity for large turbulent Reynolds numbers. Proc Combust Inst 15:655–664CrossRefGoogle Scholar
  3. 3.
    Abdel-Gayed RG, Bradley D (1977) Dependence of turbulent burning velocity on turbulent Reynolds number and ratio of laminar burning velocity to r.m.s. turbulent velocity. Proc Combust Inst 16:1725–1735CrossRefGoogle Scholar
  4. 4.
    Abdel-Gayed R, Al-Khishali K, Bradley D (1984) Turbulent burning velocities and flame straining in explosions. Proc R Soc Lond Ser A Math Phys Sci 391:393–414CrossRefGoogle Scholar
  5. 5.
    Lian H, Charalampous G, Hardalupas Y (2013) Preferential concentration of poly-dispersed droplets in stationary isotropic turbulence. Exp Fluids 54.  https://doi.org/10.1007/s00348-013-1525-3
  6. 6.
    Videto B, Santavicca D (1991) A turbulent flow system for studying turbulent combustion processes. Combust Sci Technol 76:159–164CrossRefGoogle Scholar
  7. 7.
    Bédat B, Cheng RK (1995) Experimental study of premixed flames in intense isotropic turbulence. Combust Flame 100:485–494CrossRefGoogle Scholar
  8. 8.
    Marshall A, Venkateswaran P, Noble D, Seitzman J, Lieuwen T (2011) Development and characterization of a variable turbulence generation system. Exp Fluids 51:611–620CrossRefGoogle Scholar
  9. 9.
    Driscoll JF (2008) Turbulent premixed combustion: Flamelet structure and its effect on turbulent burning velocities. Prog Energy Combust Sci 34:91–134CrossRefGoogle Scholar
  10. 10.
    Ballal DR, Lefebvre AH (1974) Turbulence effects on enclosed flames. Acta Astronautica 1:471–483CrossRefGoogle Scholar
  11. 11.
    Hurst D, Vassilicos JC (2007) Scalings and decay of fractal-generated turbulence. Phys Fluids 19.  https://doi.org/10.1063/1.2676448
  12. 12.
    Makita H (1991) Realization of a large-scale turbulence field in a small wind tunnel. Fluid Dyn Res 8:53–64CrossRefGoogle Scholar
  13. 13.
    Kang HS, Chester S, Meneveau C (2003) Decaying turbulence in an active-grid-generated flow and comparisons with large-eddy simulation. J Fluid Mech 480:129–160MathSciNetCrossRefMATHGoogle Scholar
  14. 14.
    Poortey REG, Biesheuvel A (2002) Experiments on the motion of gas bubbles in turbulence generated by an active grid. J Fluid Mech 461:127–154MATHGoogle Scholar
  15. 15.
    Stöhr M, Sadanandan R, Meier W (2011) Phase-resolved characterization of vortex–flame interaction in a turbulent swirl flame. Exp Fluids 51:1153–1167CrossRefGoogle Scholar
  16. 16.
    Roach PE (1987) The generation of nearly isotropic turbulence by means of grids. Int J Heat Fluid Flow 8:82–92CrossRefGoogle Scholar
  17. 17.
    Meares S, Masri AR (2014) A modified piloted burner for stabilizing turbulent flames of inhomogeneous mixtures. Combust Flame 161:484–495CrossRefGoogle Scholar
  18. 18.
    Pitts WM, Kashiwagi T (1984) The application of laser-induced Rayleigh light scattering to the study of turbulent mixing. J Fluid Mech 141:391–429CrossRefGoogle Scholar
  19. 19.
    Mulla IA, Chakravarthy SR (2014) Flame speed and tangential strain measurements in widely stratified partially premixed flames interacting with grid turbulence. Combust Flame 161:2406–2418CrossRefGoogle Scholar
  20. 20.
    Raffel M, Willert C, Kompenhans J (1998) Particle image velocimetry: a practical guide, second edition, Springer-Verlag, pp. 164–192Google Scholar
  21. 21.
    Benedict LH, Gould RD (1996) Towards better uncertainty estimates for turbulence statistics. Exp Fluids 22:129–136CrossRefGoogle Scholar
  22. 22.
    Sciacchitano A, Wieneke B (2016) PIV uncertainty propagation. Meas Sci Technol 27:084006CrossRefGoogle Scholar
  23. 23.
    Peters N (2000) Turbulent combustion. Cambridge University Press, Cambridge, pp 78–80CrossRefMATHGoogle Scholar
  24. 24.
    Berkooz G, Holmes P, Lumley JL (1993) The proper orthogonal decomposition in the analysis of turbulent flows. Annu Rev Fluid Mech 25:539–575MathSciNetCrossRefGoogle Scholar
  25. 25.
    Sirovich L (1987) Turbulence and the dynamics of coherent structures. Q Appl Math 45:561–590MathSciNetCrossRefMATHGoogle Scholar
  26. 26.
    Donbar JM, Driscoll JF, Carter CD (2000) Reaction zone structure in turbulent nonpremixed jet flames-from CH-OH PLIF images. Combust Flame 122:1–19CrossRefGoogle Scholar
  27. 27.
    Balachandran R, Ayoola BO, Kaminski CF, Dowling AP, Mastorakos E (2005) Experimental investigation of the nonlinear response of turbulent premixed flames to imposed inlet velocity oscillations. Combust Flame 143:37–55CrossRefGoogle Scholar
  28. 28.
    Donbar JM, Driscoll JF, Carter CD (2001) Strain rates measured along the wrinkled flame contour within turbulent non-premixed jet flames. Combust Flame 125:1239–1257CrossRefGoogle Scholar
  29. 29.
    Cheng RK, Shepherd IG (1991) The influence of burner geometry on premixed turbulent flame propagation. Combust Flame 85:7–26CrossRefGoogle Scholar
  30. 30.
    Sahu KB, Kundu A, Ganguly R, Datta A (2009) Effects of fuel type and equivalence ratios on the flickering of triple flames. Combust Flame 156:484–493CrossRefGoogle Scholar
  31. 31.
    Veynante D, Duclos JM, Piana J (1994) Experimental analysis of flamelet models for premixed turbulent combustion. Proc Combust Inst 25:1249–1256CrossRefGoogle Scholar

Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.National Centre for Combustion Research and Development & Department of Aerospace EngineeringIndian Institute of Technology MadrasChennaiIndia

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