File:Fse-trench-effect-v2.svg

Fse-trench-effect-v2.svg (SVG file, nominally 900 × 600 pixels, file size: 8 KB)

Summary

Heated length ahead of a spreading flame. Opposed-flow spread heats about 1 to 3 mm of fuel; in wind-aided spread the heated length is of the order of the flame length, 0.1 to 10 m. Based on Quintiere (2002b), p. 2-251.

Original illustration for Trench effect, level 4 Expert.

Source basis: Quintiere (2002b), p. 2-251 (control volume of wind-aided spread; Δ of the order of the flame length, 0.1 to 10 m, compared with 1 to 3 mm in opposed-flow spread; wind-aided spread can be acceleratory), Figure 2-12.5 (redraw, do not copy)
Alt text: Two fuel strips: left, a flame heating only a few millimetres ahead; right, a flame lying along the fuel and heating a long stretch ahead.

Licensing

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

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	Date/Time	Thumbnail	Dimensions	User	Comment
current	17:13, 2 November 2026		900 × 600 (8 KB)	Jan (talk \| contribs)	Watermark: Fire Safety Academy logo icon, 70 px, 45 % opacity

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Trench effect

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Short title	Heated length ahead of a spreading flame. Opposed-flow spread heats about 1 to 3 mm of fuel; in wind-aided spread the heated length is of the order of the flame length, 0.1 to 10 m. Based on Quintiere (2002b), p. 2-251.
Image title	Two fuel strips: left, a flame heating only a few millimetres ahead; right, a flame lying along the fuel and heating a long stretch ahead. Source basis: Quintiere (2002b), p. 2-251 (control volume of wind-aided spread; Δ of the order of the flame length, 0.1 to 10 m, compared with 1 to 3 mm in opposed-flow spread; wind-aided spread can be acceleratory), Figure 2-12.5 (redraw, do not copy)
Width	900
Height	600