Patent ID: 8596039

Claim:
A device for injecting a liquid mono-propellant with a large amount of flow rate modulation, the device being disposed at the upstream end of a wall of a combustion chamber of a rocket engine and including a channel for feeding it with a mono-propellant from a tank, wherein the device has a single annular speed-up channel connected to the feed channel and having its outlet opening out via an annular injection section, the speed-up channel and the annular injection section being defined firstly by a first wall forming a stationary surface of revolution situated level with said upstream end, and secondly by a second wall forming a surface of revolution on a part that is movable in translation relative to said first wall forming a stationary surface of revolution and presenting beside the combustion chamber a free end that constitutes a fine edge, and wherein the movable part has a pilot section that is subjected to the effects of the fluid flow rate in the feed channel and that acts against the action of a resilient mechanical element dimensioned to enable the movable part to move into an open position when a predetermined force is exerted on the pilot section.