Fuel Ignition Whump

How it's made

Source

a spilled fuel pool ignites across its surface. Expanding hot gas makes a rounded pressure whump, modelled by broad 45-230 Hz filtered noise with a 25-65 ms rise and a 0.6 s falling body.

Body

turbulent combustion has no stable pitch; pink and brown noise overlap at 100-700 Hz. The flame front opens the roar bandwidth from 350 Hz to 1-3 kHz in 120 ms, then cools toward 450-900 Hz.

Envelope

ignition rises in 25-65 ms, roaring flame peaks at 120 ms and holds unevenly until 45 percent of the duration; its diminishing fuel-fed tail closes smoothly by 2-3.3 s. No shock crack or debris.

Events

small vapor pockets rupture as 1-3 ms attacks with 5-18 ms noise tails, 90 events/s initially, thinning to 3/s after 350 ms. These are gas crackles, without ringing wood or metal resonances.

Modulation

independent 7-13 Hz random turbulence modulates the two sides; a shared 2 Hz drift moves their spectral edge. The pressure stays centered while the flame surface has restrained stereo width.

Variation

seeded noise, pocket timing, duration and pan; macros set burn duration, pool depth, heat, onset crackle and spread. Presets cover a shallow flash, deep pool, ragged spill and broad flame sheet.

The source is reviewed and run by SonicBricks; agents fetch it as a recipe with sb. It is not published on this page.