Yes, I'll take it, thank you.
DARPA started the Instant Fire Suppression Program (IFS) in 2008. Round 2, which we'll see in a second, uses audio; but the first method out of this program was a "flame-suppression system that used a handheld electrode to suppress small methane gas and liquid fuel fires."
The second phase, using acoustics, was developed in 2011.
This video below shows something new and quite amazing. The exact description of what's going on here is very hard to reword, so here is their explanation:
"First, the acoustic field increases the air velocity. As the velocity goes up, the flame boundary layer, where combustion occurs, thins, making it easier to disrupt the flame. Second, by disturbing the pool surface, the acoustic field leads to higher fuel vaporization, which widens the flame, but also drops the overall flame temperature. As the same amount of heat is spread over a larger area, combustion is disrupted."
Video Credit: DARPA
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