Injection element

1. 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.

2. The combustion device according to claim 1 , wherein the outer element further comprises a swirler space in which the bores are located.

3. The combustion device according to claim 2 , wherein the swirler space comprises a tapering area in which the bores are located.

4. The combustion device according to claim 2 , wherein the bores are arranged and aligned in the outer element such that the cooling liquid film layer and the fuel injected into the combustion space do not touch one another or mix just after entry into the combustion space.

5. The combustion device according to claim 1 , wherein the outer element further comprises an annular gap, and wherein the bores connect with the annular gap to generate a swirl.

6. The combustion device according to claim 1 , wherein the bores are uniformly distributed over an entire circumference of the outer element.

7. The combustion device according to claim 1 , wherein the bores are uniformly distributed over a portion of an entire circumference of the outer element.

8. The combustion device according to claim 1 , wherein the outer element is arranged coaxially with the inner element.

9. The combustion device according to claim 1 , wherein each of the first outlet opening, the at least one second outlet opening and the third outlet openings are arranged on the front face surface.

10. A combustion device comprising:

an injection element, comprising:

a front face surface;

an inner element forming a first passage in fluid communication with a first source of fuel and comprising a first outlet opening that receives a first portion of fuel from the first passage;

an outer element forming a second passage in fluid communication with a second source of fuel and having at least one second outlet opening for receiving and injecting fuel into a combustion space, and arranged coaxially to the first outlet opening;

the inner element further comprising third outlet openings receiving the remaining portion of fuel from the first passage and 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 to surround the first 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.

11. The combustion device according to claim 10 , wherein the bores are uniformly distributed over an entire circumference of the inner element.

12. The combustion device according to claim 10 , wherein the bores are uniformly distributed over a portion of an entire circumference of the inner element.

13. The combustion device according to claim 10 , wherein the at least one second outlet opening comprises component feed bores, wherein the bores and the component feed bores are arranged such that liquid jets exiting from the bores mix with liquid jets exiting from the component feed bores.

14. The combustion device according to claim 10 , wherein the outer element is arranged coaxially with the inner element.

15. The combustion device according to claim 10 , wherein each of the first outlet opening, the at least one second outlet opening and the third outlet openings are arranged on the front face surface.

16. A method of injecting fuel from an injection element into a combustion chamber comprising:

guiding fuel into the combustion chamber through a first passage formed by an inner element of the injection element and out of a first outlet opening;

guiding fuel into the combustion chamber through a second passage formed by an outer element of the injection element and out of a second outlet opening of the injection element arranged coaxially with the first outlet opening; and

forming a cooling liquid film layer on an inner wall of a combustion space downstream of the injection element in the combustion chamber through bores arranged along a ring to coaxially surround the first outlet opening, and 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 the bores are supplied with fuel from one of the first passage or the second passage upstream of the first outlet and the second outlet.

17. The method of claim 16 , wherein the bores are arranged to coaxially surround the second outlet opening.