Patent ID: 8516821

Claim:
A combustion device comprising: an injection element, the injection element comprising: a front face surface; an inner element forming a first passage in fluid communication with a first source of fuel and having a first outlet opening; an outer element forming a second passage in fluid communication with a second source of fuel, comprising: at least one second outlet opening receiving a first portion of the fuel from the second passage and injecting fuel into a combustion space, and arranged coaxially to the first outlet opening; and third outlet openings receiving the remaining portion of the fuel from the second passage and positioned radially beyond the at least one second outlet opening composed of bores forming a cooling liquid film layer on an inner wall of the combustion space downstream of the injection element, wherein the bores are arranged along a ring, which is coaxial to the first outlet opening and the at least one second outlet opening, and the bores are structured and arranged to supply the cooling liquid film layer in an outwardly-directed direction relative to a longitudinal axis of the first outlet opening upon exiting the injection element, wherein at least two of the first outlet opening, the at least one second outlet opening and the third outlet openings are arranged on the front face surface, wherein the injection element is a rocket drive injection element, and wherein the bores open to the combustion space.