Hysteresis of methane inverse diffusion flames with co-flowing air and combustion products

作者：Johnson Michael B^*; Sobiesiak Andrzej

来源：Proceedings of the Combustion Institute, 2011, 33(1): 1079-1085.

DOI：10.1016/j.proci.2010.07.090

• Inverse diffusion flame
• Partially-premixed combustion
• Multi-port burner
• Numerical simulation

Non-premixed flames of methane in co-flowing air and co-flowing combustion products from a lean, premixed, burner-stabilized, methane-air flame are studied with an additional central air flow, creating a double-flame structure. As the central air velocity is increased, a partially-premixed flame forms on the centreline. The height of this flame is found to be linear with the central fuel velocity, and a constant fraction of the outer diffusion flame height. Numerical simulations suggest that when the mixture upstream of the partially-premixed flame reaches Phi approximate to 1, it propagates upstream and stabilizes closer to the burner as an inverse diffusion flame. This hysteresis between the transition to, and extinction of the inverse diffusion flame is found to be larger with co-flowing combustion products.

• 出版日期2011