File:Fse-premixed-flame-v4.svg

Fse-premixed-flame-v4.svg (SVG file, nominally 900 × 600 pixels, file size: 8 KB)

Summary

A premixed flame in a duct: the curved flame front has two to three times the area of the duct section, so it moves along the duct two to three times faster than the burning velocity. Based on Simmons (2002), p. 1-147.

Original vector illustration for Premixed flame, level 2 Intermediate.

Source basis: Simmons (2002), p. 1-147 (Equation 3, area ratio of two or three, acceleration of the flame when products cannot vent, transition to detonation at 1,500 to 3,000 m/s)
Alt text: Duct section with a curved flame front whose area is two to three times the duct cross-section, moving into unburnt mixture.

Licensing

New drawing by Fire Safety Academy. © Fire Safety Academy.

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	Date/Time	Thumbnail	Dimensions	User	Comment
current	16:54, 2 November 2026		900 × 600 (8 KB)	Lisa (talk \| contribs)	Watermark: Fire Safety Academy logo icon, 70 px, 45 % opacity

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Premixed flame

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Short title	A premixed flame in a duct: the curved flame front has two to three times the area of the duct section, so it moves along the duct two to three times faster than the burning velocity. Based on Simmons (2002), p. 1-147.
Image title	Duct section with a curved flame front whose area is two to three times the duct cross-section, moving into unburnt mixture. Source basis: Simmons (2002), p. 1-147 (Equation 3, area ratio of two or three, acceleration of the flame when products cannot vent, transition to detonation at 1,500 to 3,000 m/s)
Width	900
Height	600