Observations on Jet-Flame Blowout

Table 3

Comparison of theories on blowout from past publications.

	Blowout concepts supported	Proposed blowout mechanism
Broadwell et al. [13]	Large-scale structures move hot product to flame leading edge	Mixing between hot products and unburned fuel allows insufficient time for combustion to occur
Dahm and Dibble [15]	Molecular mixing rate	Reduction in the fuel velocity with increased coflow velocity corresponds to a consistent blowout parameter
Tieszen et al. [22]	Local flow velocity exceeds turbulent flame speed	Turbulent flame propagation towards the outer edge of the reaction zone stabilizes flames near blowout
Han and Mungal [16]	Flame propagation against incoming reactants	Flame base moves into a higher-velocity region due to a change in the stoichiometric velocity of the flame surface
Wu et al. [21]	Triple flames/flame pulsation	Lessening of the stoichiometric branch of the triple flame leads to downstream recession and eventual blowout