Ignition system for combustible gases or liquids

An ignition system comprising a plurality of igniters, each constituted by a receptacle, an ignition initiator disposed at one end of said receptacle, and a solid charge placed inside the receptacle, the solid charge comprising pyrotechnic compositions and reactive divided metals capable of reacting with one another exothermically, said compositions successively comprising, from the end of the receptacle carrying the initiator, a pyrotechnic ejection composition, a pyrotechnic ignition composition, and reactive divided metals respectively of decreasing activity, wherein said igniters are associated with a common combustion chamber containing a fluid constituted by liquid products or formed by mixtures of gases and liquids or solid particles, to ensure, by projection of said solid charge within said fluid, the heating or ignition of said fluid and wherein at least one igniter is disposed on a supply conduit of the combustion chamber and projects the pyrotechnic products that it generates substantially in the direction of main flow of the fluid circulating in said conduit.