X-shaped flames were visually observed when a coaxial burner consisting of two coaxial streams of different premixed streams of methane-air was operated near blowout. High-speed photography showed that a rotating, slanted flamelet was formed; the shape of the flamelet was an asymmetric triangle with a curved surface. The rotational frequency was about 30 Hz and made no sound. Similar X-shaped flames have previously been observed in sudden-expansion tubes. Particle tracks were photographed by introducing seed …
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