DOI QR코드

DOI QR Code

예혼합화염 영역에서 확산화염의 불안정성에 관한 연구

이수룡;김종수
Lee, Su-Ryong;Kim, Jong-Su

  • 발행 : 1997.09.01

초록

The diffusional-thermal instability of diffusion flames in the premixed-flame regime is studied in a constant-density two-dimensional counterflow diffusion-flame configuration, to investigate the instability mechanism by which periodic wrinkling, travelling or pulsating of the reaction sheet can occur. Attention is focused on flames with small departures of the Lewis number from unity and with small values of the stoichiometric mixture fraction, so that the premixed-flame regime can be employed for activation-energy asymptotics. Cellular patterns will occur near quasisteady extinction when the Lewis number of the more completely consumed reactant is less than a critical value( ~ =0.7). Parametric studies for the instability onset conditions show that flames with smaller values of the Lewis number and stoichiometric mixture fraction and with larger values of the Zel'dovich number tend to be more unstable. For Lewis number greater than unity, near-extinction flame are found to exhibit either travelling instability or pulsating instability.

키워드

확산화염;안정성;소염;맥동;셀모양 불안정성

참고문헌

  1. Combust. Sci. Technol. v.15 pp.137-146 Diffusional-Thermal Theory of Cellular Flames Sivashinsky, G. I.
  2. Acta Astronautica v.1 pp.1007-1039 The Asymptotic Structure of Counterflow Diffusion Flame for Large Activation Energies Linan, A.
  3. Combust. Flame v.10 pp.205-220 An Analytical Study of the Stability of a Laminar Diffusion Flame Kirkby, L. L.;Schmitz, R. A.
  4. Combust. Sci. Technol. v.31 pp.75-90 On the Dynamics of Nearly-Extinguished Non-adiabatic Cellular Flames Joulin, G.;Sivashinsky, G. I.
  5. Combust. Flame v.35 pp.139-153 Linaer Stability Analysis of Nonadiabatic Flames:Diffusional-Thermal Model Joulin, G.;Clavin, P.
  6. 18th Symp.(Int'l) on Combustion, The Combustion Institute pp.695-703 An Experimental Study of Effect of Inert Gases on Extinction of Laminar Diffusion Flames Ishizuka, S.;Tsuji, H.
  7. Combust. Sci. Technol. v.55 pp.83-88 Instability-Induced Quenching of Plane Non-Adiabatic Flames Joulin, G.;Sivashinsky, G. I.
  8. 24th Symp. (int'l) on Combustion, the Combustion Institute, Pittsburgh pp.213-221 Diffusive-Thermal Instability and Flame Extinction in Nonpremixed Combustion Chen, R.;Mitchell, G. B.;Ronney, P. D.
  9. Theory of Laminar Flames pp.38-57 Buckmaster, J. D.;Ludford, G. S. S.
  10. J. of Fluid Mech. v.327 pp.273-301 Diffustional-Thermal Instability of a Diffusion Flames Kim, J. S.;Williams, F. A.;Ronney, P. D.
  11. Combustion Theory and Modeling v.1 pp.13-40 Linear Analysis of Diffusional-Thermal Instability in Diffusion Flames with Lewis Numbers Close to Unity Kim, J. S.
  12. Combust. Sci. Technol. v.14 pp.177-182 The Transition to Instability in a Steady Hydrogen-Oxygen Diffusion Flame Dongworth M. R.;Melvin, A.