Journal of the Korean Society of Safety (한국안전학회지)

The Korean Society of Safety (한국안전학회)
권호 표지

Numerical Investigation of the Flamelet Structure of Buoyant Jet Diffusion Flames

부력 영향을 받는 제트 확산화염의 화염편 구조에 관한 수치계산 연구

  • Oh, Chang-Bo (Division of Safety Engineering, Pukyong National University) ;
  • Lee, Eui-Ju (Division of Safety Engineering, Pukyong National University)
  • 오창보 (부경대학교 안전공학부) ;
  • 이의주 (부경대학교 안전공학부)
  • Published : 2009.02.28
Download PDF
⟨ Previous Next ⟩

Abstract

Direct numerical simulations(DNS) were performed for the prediction of transient buoyant jet diffusion flames where the Froude numbers(Fr) are 5 and 160, respectively. The thermodynamic and transport properties were evaluated using CHEMKIN package to enhance the prediction performance of the DNS code. The simulated buoyant jet diffusion flame of Fr=5 and 160 showed the transient, dynamic motion well. It was identified that the buoyant jet flames were flickered periodically, and the simulated flickering frequency of the jet diffusion flame of Fr=5 was 12.5Hz, which was in good agreement with the experimental results. The flamelet structures of the buoyant jet diffusion flames could be well understood by comparing the scalar dissipation rates(SDR) and the heat release rates(HRR) of the flames. It was found that the SDR was strongly coupled with the HRR in the buoyant jet diffusion flames.

Keywords

References

  1. V. Novozhilov, 'Computational Fluid Dynamics Modeling of Compartment Fires', Progress in Energy and Combustion Science, Vol. 27, pp. 611-666, 2001 https://doi.org/10.1016/S0360-1285(01)00005-3
  2. K. McGrattan, B. Klein, S. Hstikka, and J. Floyd, 'Fire Dynamic Simulator(Version 5) User's Guide', NIST Special Publication 1019-5,2008
  3. S. Mahalingam, B. J. Cantwell and J. H. Ferziger, 'Full Numerical Simulation of Coflowing, Axisymmetric Jet Diffusion Flames', Physics of Fluids A, Vol. 2, No.5, pp. 720-728, 1990 https://doi.org/10.1063/1.857725
  4. R. Zhong, 'Direct Numerical Simulation of Turbulent Nonpremixed Reacting Flows with Buoyancy Effects', Ph.D. Dissertation of University of California at Irvine, 1999
  5. R. J. Kee, F. M. Rupley and J. A. Miller, 'Chemkin-II :20 A Fortran Chemical Kinetic Package for the Analysis of Gas Phase Chemical Kinetics', Sandia Report, SAND89-8009B,1989
  6. R. J. Kee, G, Dixon-Lewis, J. Warnatz, M. E. Coltrin and J. A. Miller, 'A Fortran Computer Code Package for the Evaluation of Gas-Phase Multicomponent Transport Properties', Sandia Report, SAND86-8246, 1986
  7. 오창보, 이청언, '비정상 $CH_4$/공기 제트 확산화염에 관한 수치모사', 대한기계학회논문집 B권, 제 25권, 제8호, pp. 1087-1096, 2001
  8. C. B. Oh, A. Hamins, M. Bundy and J. Park, 'The Two-dimensional Structure of Low Strain Rate Counterflow Nonpremixed Methane Flames in Normal and Microgravity', Combustion Theory and Modelling, Vol. 12, No.2, pp. 283-302,2008 https://doi.org/10.1080/13647830701642201
  9. H. N. Najm, P. S. Wyckoff and o. M. Knio, 'A Semiimplicit Numerical Scheme for Reacting Flow. I. Stiff Chemistry', Journal of Computational Physics, Vol. 143, pp. 381-402,1998 https://doi.org/10.1006/jcph.1997.5856
  10. C. W. Hirt and J. L. Cook, 'Calculating Three-dimensional Flows around Structures and over Rough Terrain', Journal of Computational Physics, Vol. 10, pp. 324-340, 1972 https://doi.org/10.1016/0021-9991(72)90070-8
  11. V. Dupont, M. Pourkashanian and A. Williams, 'Modelling of Process Heaters Fired by Natural Gas', Journal of the Institute of Energy, Vol. 66, pp. 20-28, 1993
  12. L.-D. Chen, J. P. Seaba, W. M. Roquemore and L. P. Goss, 'Buoyant Diffusion Flames', Proceedings of the Combustion Institute, Vol. 22, pp. 677-684, 1988