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ISSN Печать: 1065-3090
ISSN Онлайн: 1940-4336
Indexed in
SPLITTING OF FORCED ELLIPTIC JETS AND FLAMES
Краткое описание
A 'split' diffusion flame has been observed in response to high-amplitude axial velocity perturbations of the methane fuel jet. At specific excitation frequencies and amplitudes the driven flame splits into a central jet and one or two side jets. The splitting is accompanied by a partial detachment of the flame from the nozzle exit, a shortening of the flame by a factor of two, and a change from the common yellow color of soot radiation to a clear blue flame. Phase locked laser sheet flow visualization has been applied to reacting and nonreacting methane jets. Similar flow structures are observed in both reacting and nonreacting split jets. A roller-braid interaction similar to that seen in absolutely unstable jets may be responsible for the split flow, but additional features are observed.