- Author
- Sohrab, S. H. | Ye, Z. Y. | Law, C. K.
- Title
- Experimental Study on flame Interactions.
- Coporate
- Northwestern Univ., Evanston, IL
- Report
- WSS/CI 83-37,
- Book or Conf
- Combustion Institute/Western States Section. Spring Meeting, 1983. April 11-12, 1983, Pasadena, CA, 27 p., 1983
- Keywords
- flame interaction
- Abstract
- Downstream interactions between two counterflow premixed flames of identical or different fuels under various stoichiometries are investigated. In addition to the single lean or rich premixed flames (LPF, RPF) or diffusion flame (DF), interactive combustion between (LPF-LPF), (RPF-RPF), (LPF-DF-RPF), (RPF-DF), and (LPF-DF) are encountered. Also, the existence of premixed-diffusion (hybrid) flames (PDF) is established in which either oxidizer or fuel are supplied to the reaction zone from both sides. The contours corresponding to the critical extinction concentrations for (LPF-LPF) and (RPF-RPF) corresponding to CH4/CH4, C4H10/C4H10 and CH4/C4H10 fuels have been determined. Results show that while the conventional flammability limits are contracted in the presence of downstream interactive heat loss, they can also be significantly widened through both heat gain and concentration interactions such that burning of a superadiabatic limit mixture, can persist even as the concentrtion of the deficient species vanishes. Our experiments also demonstrate the existence of superadiabatic negative flames whose propgation velocity is in the same general direction as that of the bulk convective flow. The potential implications of the present results on the understanding of turbulent flames are discussed.