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Fse-virtual-origin-v1.svg (SVG file, nominally 900 × 600 pixels, file size: 8 KB)
Summary
The virtual origin is the point from which the plume above the flames appears to originate: below the fuel surface for a wide, low fire (left) and above it for a tall, intense fire (right). Based on Heskestad (2002), pp. 2-6 and 2-11.
Original illustration for Virtual origin, level 4 Expert.
- Source basis: Heskestad (2002), p. 2-6 (equivalent point source, z replaced by z − z0, negative z0 below the fire source) and p. 2-9 (point source from which the plume above the flames appears to originate) and p. 2-11 (negative z0 for low heat release and large diameters, positive for high heat release); Iqbal and Salley (2004), p. 9-5 (Figure 9-3, redraw, do not copy)
- Alt text: Two fire plumes: dashed plume edges extended downwards meet at a point below the fuel of a wide fire and above the fuel of a tall fire.
Licensing
New drawing by Fire Safety Academy. © Fire Safety Academy.
File history
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 17:15, 2 November 2026 | | 900 × 600 (8 KB) | Jan (talk | contribs) | Watermark: Fire Safety Academy logo icon, 70 px, 45 % opacity |
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