급격한 평균유속 변동에 의한 관내 Air/$C_3$$H_8$ 예혼합 화염의 소화특성에 관한 실험적 연구

DOI QR코드

DOI QR Code

김남일;이은도;신현동
Kim, Nam-Il;Lee, Eun-Do;Sin, Hyeon-Dong

  • 발행 : 2001.04.01

초록

Many previous researches on the premixed flame in a tube have treated the unsteady flame behaviors in which the shape, position and intensity of the flame varied, but more detail and fundamental research has been necessary. The flame stabilization condition in a tube, a unique steady state, and the unsteady behaviors, using the stabilization condition as an initial condition, were carried out in recent years. In this paper, propane-air premixed flame was stabilized in a tube and the flame behavior was observed when the mean velocity variation was imposed into the opposite direction of the initial mean velocity. The velocity variation is larger than the burning velocity and longer than the reaction time scale. During the period of the velocity variation flame is not extinguished. But after the period of the mean velocity variation the flame could be re-stabilized or be extinguished depending on the experimental conditions: equivalence ratio, period of velocity variation and magnitude of velocity variation. The extinction mechanisms were classified into the two cases, one is caused by the flame stretch in the shear layer near the wall, and the other is caused by the vortices and vortexes, which are generted by the acoustic waves.

키워드

예혼합 화염;관내 화염 전파;스트레치;유속변동;소화경계층

참고문헌

  1. 최병일, 신현동, '원관내에서 진동하는 예혼합화염의 거동에 관한 실험적 연구,' 대한기계학회 1998년도 춘계학술대회논문집 B, pp. 308-313
  2. Kim, N. I., Lee, U. D., Shin, H. D., (2000) 'Laminar Premixed Flame Propagation Using Large Axial Velocity Variation,' Proc. Combust. Inst. 28: to be published
  3. Clavin, P., Pelce, P., He, L., (1990) 'One-Dimensional Vibratory Instability of Planar Flames Propagation in tubes,' J. Fluid Mech. 216, 299-322 https://doi.org/10.1017/S0022112090000441
  4. Searby, G., Rochwerger, D., (1991) 'A Parametric Acoustic Instability in Premixed Flames,' J. Fluid Mech. 231, 529-543 https://doi.org/10.1017/S002211209100349X
  5. Markstein, G., (1956) 'A Shock Tube Study of Flame Front Pressure Wave Interaction,' Proc. Combust. Inst. 6: 387-398
  6. Kaskan, W. E., (1953) 'An Investigation of Vibrating Flames,' Proc. Combust. Inst. 4: 575-591
  7. Clanet, C., Searby, G., (1996) 'On the 'Tulip Flame' Phenomenon,' Combust. Flame, 105, 225-238 https://doi.org/10.1016/0010-2180(95)00195-6
  8. Hackert, C. L., Ellzey, J. L., Ezekoye, O. A., (1998) 'Effects of Thermal Boundary Condition on flame Shape and Quenching in Ducts,' Combust. Flame , 112, 73-84 https://doi.org/10.1016/S0010-2180(97)81758-0
  9. Dold, J. W., Joulin, G., (1995) 'An Evolution Equation Modeling Inversion of Tulip Flames,' Combust. Flame, 100, 450-456 https://doi.org/10.1016/0010-2180(94)00156-M
  10. Starke, R., Roth, P., (1986) 'An Experimental Investigation of Flame Behavior During Cylindrical Vessel Explosions,' Combust. Flame, 66, 249-259 https://doi.org/10.1016/0010-2180(86)90138-0
  11. Lewis, B., Elbe, G., (1987) 'Combustion, Flames and Explosions of Gases,' ACADEMIC PRESS, INC
  12. Salamandra, G. D., (1958), 'Formation of Detonation Wave During Combustion of Gas in Combustion Tube,' Proc. Combust. Inst. 7: 851-855