Effect of Pyrolyzing Fuel Position on Ignition and Flame Propagation in a Cylindrical Enclosure

- Journal title : Transactions of the Korean Society of Mechanical Engineers B
- Volume 25, Issue 1, 2001, pp.133-142
- Publisher : The Korean Society of Mechanical Engineers
- DOI : 10.22634/KSME-B.2001.25.1.133

Title & Authors

Effect of Pyrolyzing Fuel Position on Ignition and Flame Propagation in a Cylindrical Enclosure

Han, Jo-Yeong; Kim, Jeong-Su;

Han, Jo-Yeong; Kim, Jeong-Su;

Abstract

Investigation on ignition and flame propagation of pyrolyzing fuel in a cylindrical enclosure is accomplished. The pyrolyzing fuel of cylindrical shape is located in an outer cylinder sustained at high-temperature. Due to gravity, the buoyancy motion is inevitably incurred in the enclosure and this affects the flame initiation and propagation behavior. The radiative heat transfer plays an important role since a high temperature difference is involved in the problem. Therefore in all cases presented here, the intrinsic radiation effects are considered. Numerical studies have been performed over various governing parameters, such as Grashof number, overheat ratio, and vertical fuel eccentricity. Depending on the Grashof number, the flame behavior is found to be totally different: a separated visible flame appears as the Grashof number reaches 10(sup)7. The location of flame onset is also affected by the vertical eccentricity of inner pyrolyzing fuel as well as thermal conditions applied.

Keywords

Ignition;Flame Propagation;Radiation;Vertical Eccentricity;GrashofNumber;Overheat Ratio;

Language

Korean

References

1.

Chen, C. H., and Cheng, M. C., 1994, 'Gas-Phase Radiative Effects in Downward Flame Spread in Low Gravity,' Combust. Sci. and Tech., Vol. 97, pp. 63-83

2.

Grayson, G., Sacksteder, K., Ferkul, P. V., and T'ien, J. S., 1994, 'Flame Spreading Over a Thin Fuel in Low Speed Concurrent Flow: Droptower Experimental Results and Comparison with Theory,' Microgravity Sci. Tech., pp. 187-196

3.

Ferkul, P. V., and T'ien, J. S., 1994, 'A Model of Low-Speed Concurrent Flow Flame Spread Over a Thin Solid,' Combust. Sci. and Tech., Vol. 99, pp. 345-370

4.

Han, C. Y., and Baek, S. W., 1995, 'Radiative Ignition of Volatile Gases on a Vertical Fuel Plate,' Combust. Sci. and Tech., Vol. 109, pp. 309-325

5.

Baek, S. W., Kim, T. Y., and Kaplan, C. R., 1997, 'Ignition Phenomenon of Solid Fuel in a confined Rectangular Enclosure,' Int. J. Heat Mass Transfer, Vol. 40, No. 1, pp. 89-99

6.

Foutch, D. W., and T'ien, J. S., 1987, 'Extinction of a Stagnation-Point Diffusion Flame at Reduced Gravity,' AIAA J., Vol. 25, No. 7, pp. 972-976

7.

Han, C. Y., and Baek, S. W., 1999, 'Natural Convection Phenomena Affected by Radiation in Concentric and Eccentric Horizontal Cylindrical Annuli,' Numer. Heat Transfer, Part A, Vol. 36, pp. 473-488

8.

Kuehn, T. H., and Goldstein, R. J., 1978, 'An Experimental Study of Natural Convection Heat Transfer in Concentric and Eccentric Horizontal Cylindrical Annuli,' J. Heat Transfer, Vol. 100, pp. 635-640

9.

Dua, S. S., and Cheng, P., 1975, 'Multi-Dimensional Radiative Transfer in Non-isothermal Cylindrical Media with Non-isothermal Bounding Walls,' Int. J. Heat Mass Transfer, Vol. 18, pp. 245-259

10.

한조영, 2000, '원형공간내 열분해 연료의 점화 및 화염전파,' KAIST 박사학위논문

11.

Yang, C. T., and T'ien, J. S., 1998, 'Numerical Simulation of Combustion and Extinction of a Solid Cylinder in a Low-Speed Cross Flow,' J. Heat Transfer, Vol. 120, pp. 1055-1063