Extinguishing fires and suppressing explosions

摘要

A fire extinguishing or explosion suppression device comprises a chamber (38) and a nozzle (29, 32a-d). The nozzle (29, 32a-d) defines a discharge pathway from the chamber (38). The chamber has an inlet (40) for pressure-driven introduction of a liquid (46) into the chamber (38). The chamber (38) is shaped so that a gas contained in the chamber before the introduction of the liquid (46) is entrained into the liquid (46) during the pressure driven introduction of the liquid such that a mixture of the liquid and the gas is discharged through the nozzle (29, 32a-d) to create a mist (50) for extinguishing a fire or suppression of an explosion. After the gas has been discharged from the chamber (38), the nozzle (29) produces a spray having a core of larger liquid droplets (54) with the core being surrounded by smaller liquid droplets (56).