A gas jet is simply a device designed to emit
a stream of gas with a particular set of intended properties. Uses range from stove
s (where gas jets are intended to mix natural gas
with atmospheric oxygen
for even burning and heat generation) to spacecraft
and to recoilless gun
s. In spacecraft, or on aircraft
s, such jets are intended to produce thrust
, and are either cold gas jet
s (emitting gas from a pressurized
source) or hot gas jets, with gases resulting from combustion
In recoilless guns, the gas jets are specially designed ducts and vents which allow the hot gases from the combustion of the shell's propellant (or rocket exhaust) to escape the weapon in such a way that the impulse produced by the gas jet mitigates the recoil experienced by the weapon and shooter.
One problem with the use of gas jets on recoil neutralization systems (and muzzle brakes) is that on larger weapons the gas can itself be a hazard to the shooter, causing burns through heat and chemical action.