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http://dx.doi.org/10.3795/KSME-B.2003.27.9.1209

An Investigation on Dynamic Behaviors of Single Vortex with CO2 Dilution in a CH4-Air Jet Diffusion Flame  

Hwang, Chul-Hong (인하대학교 대학원 기계공학과)
Oh, Chang-Bo (인하대학교 대학원 기계공학과)
Lee, Dae-Yup (인하대학교 기계공학과)
Lee, Chang-Eon (인하대학교 기계공학과)
Publication Information
Transactions of the Korean Society of Mechanical Engineers B / v.27, no.9, 2003 , pp. 1209-1219 More about this Journal
Abstract
The dynamic behaviors of the single vortex interacting with $CH_4-Air$ jet diffusion flame are investigated numerically. The numerical method is based on a predict-corrector scheme for a low Mach number flow. A two-step global reaction mechanism is adopted as a combustion model. Studies are conducted in fixed initial velocities for the three cases according as where $CO_2$ is added; (1) without dilution, (2) dilution in fuel stream and (3) dilution in oxidizer stream. A single vortex is generated by an axisymmetric jet, which is made by an impulse of a cold fuel when a flame is developed entirely in a computational domain. The simulation shows that $CO_2$ dilution in fuel stream results in somewhat larger vortex radius, and greater amount of entrainment of surrounding fluid than in other cases. Thus, the dilution of $CO_2$ in fuel stream enhances the mixing in single vortex and increases the stretching of the flame surface. The budgets of the vorticity transport equation are examined to reveal the mechanism of vortex formation when $CO_2$ is added. It is found that, in the case of $CO_2$ dilution in fuel stream, the vortex destruction due to volumetric expansion and the vortex production due to baroclinic torque are more dominant than in other cases.
Keywords
Vortex; Flame-Vortex Interaction; $CO_2$ Dilution; Diffusion Flame;
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Times Cited By KSCI : 2  (Citation Analysis)
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1 McMurtry P. A., Jou W. H., Riley J. J. and Metcalfe R. W., 1985, 'Direct Numerical Simulations of a Reacting Mixing Layer with Chemical Heat Release,' AIAA Journal, Vol. 24, No. 6, pp. 962-970   DOI   ScienceOn
2 Kee R. J., Rupley F. M. and Miller J. A., 1989, 'Chemkin-II : A Fortran Chemical Kinetic Package for the Analysis of Gas Phase Chemical Kinetics,' Sandia Report, SAND89-8009B
3 Kee R. J., Lewis G. D. Warnatz J., Coltrin E. and Miller J. A., 1986, 'A Fortran Computer Code Package for the Evaluation of Gas-Phase Multicomponent Transport Properties,' Sandia Report, SAND86-8246
4 Lee C. E., Lee S. R., Han J. W. and Park J., 2000, 'Numerical Study on Effect of $CO_2$ in Flame Structure and NOx Formation of $CH_4-air$ Counterflow Diffusion Flame,' Int. J. Energy Research, Vol. 24, pp. 2-12
5 Han J. W. and Lee C. E., 2002, 'Numerical Study on Flame Structure and NO Formation Characteristics in Oxidizer-controlled Diffusion Flames,' Transactions of KSME B, Vol. 26, No. 5, pp. 742-749
6 Liu H., Guo H., Smallwood G. J. and GuIder O. L., 2001, 'The Chemical Effects of Carbon Dioxide as an Additive in an Ethylene Diffusion Flame: Implications for soot and NOx Formation,' Combustion and Flame, Vol. 125, pp. 778-787   DOI   ScienceOn
7 Bae J. R. and Lee B. J., 2002, 'Effect of Diluents and Oxygen-enrichness on the Stability of Nonpre-mixed Flame,' Proceedings of the KSME 2002 Spring Annual Meeting B, pp. 2019-2024
8 Saito N., Ogawa Y., Saso Y., Liao C. and Sakei R., 1996, 'Flame-extinguishing Concentrations and Peak Concentrations of $N_2,\;Ar,\;CO_2$ and Their Mixtures for Hydrocarbon Fuels,' Fire Safety Journal, Vol. 27, pp. 185-200   DOI   ScienceOn
9 Lee C. E., Hwang C. H. and Kim S. H., 2002, 'Characteristics of Flame Stabilization of the LFG Mixing Gas,' Transactions of KSME B, Vol. 26, No. 2, pp. 328-335
10 Charles E. B., 1998, Oxygen-Enhanced Combustion, CRC Press
11 James S. and Madnia C. K., 1996, 'Direct Numerical Simulation of a Laminar Vortex Ring,' Phys. Fluids, Vol. 8, No. 9, pp. 2400-2414   DOI   ScienceOn
12 Dupont V. Pourkashanian M. and Williams A., 1993, 'Modeling of Process Heaters Fired by Natural Gas,' Institute of Energy, Vol. 66, pp. 20-28
13 Jiang X. and Luo K. H., 2000, 'Spatial Direct Numerical Simulation of the Large Vortical Structures in Forced Plumes,' Flow Turbulence and Combustion, Vol. 64, pp. 43-69   DOI
14 Najm, H. N. and Wyckoff P. S., 1997, 'Premixed Flame Response to Unsteady Strain Rate and Curvature,' Combustion and Flame, Vol. 110, pp. 92-112   DOI   ScienceOn
15 Hirt, C. W. and Cook, J. L., 1972, 'Calculating Three-Dimensional Flows Around Structures and over Rough Terrain,' Journal of Computational Physics, Vol. 10,pp. 324-340   DOI   ScienceOn
16 Oh C. B. and Lee C. E., 2001, 'Numerical Simulation of Unsteady $CH_4/Air$ Jet Diffusion Flame,' Transactions of KSME B, Vol. 25, No. 8, pp. 1087-1096
17 Hewett J. S. and Madnia C. K., 1998, 'Flame-Vortex Interaction in a Reacting Vortex Ring,' Phys. Fluids, Vol. 10, No. 1, pp. 189-205   DOI   ScienceOn