Patent ID: 8141338

Claim:
A device for injecting a liquid mono-propellant with a high degree of flow rate modulation and an injection speed that is stable, the device being closable for extinction and re-ignition purposes, being disposed at an upstream end of the wall of a combustion chamber of a rocket engine, and including at least one feed channel for feeding mono-propellant from a tank, wherein: the device includes first and second concentric annular speed-up channels connected to the feed channels and having outlets opening out respectively via first and second annular injection sections that are situated in a plane that is substantially perpendicular to the axis of the chamber, the first and second concentric annular channels being oriented to converge towards each other with a resultant that lies substantially along the axis of the chamber, forming a predefined angle so as to output two sheets of injected liquid mono-propellant that impact against each other in an atomization ring at a predetermined distance from the upstream end forming the end wall of the combustion chamber and in the vicinity of the axis of the combustion chamber; the first annular speed-up channel and the first annular injection section are 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 secured to a part that is movable in translation relative to said first wall forming a stationary surface of revolution; the second annular speed-up channel and the second annular injection section are defined firstly by a third wall forming a stationary surface of revolution situated at the level of said upstream end and secondly by a fourth wall forming a surface of revolution secured to said part that is movable in translation relative to said first and third walls forming stationary surfaces of revolution; and the part that is movable in translation relative to the first and third walls forming stationary surfaces of revolution has a plurality of radial orifices to enable the second speed-up channel to be fed from a common feed channel that feeds the first speed-up channel directly.