Combustion apparatus and gas turbine engine

[0038]FIG. 1 of the present invention shows a schematic cross-sectional side view of a combustion apparatus according to the prior art. The combustion apparatus shown in FIG. 1 comprises a combustion chamber 12, a pre-chamber 14 located upstream of the combustion chamber 12, a first device 10 for mixing a fuel with an oxidant, wherein the first device 10 is located upstream of the pre-chamber 14. Moreover, the combustion apparatus according to the prior art also comprises a back plate 50 and an outer casing. The combustion chamber 12 exhibits a first wall 20 and a second wall 30, wherein the first wall 20 is spaced to the second wall 30. Therefore, the first wall 20 and the second wall 30 build a cavity 40. The first wall 20 exhibits a first opening for introducing a coolant into the cavity 40. Furthermore, the second wall 30 exhibits at least one opening 21 for outputting the coolant from the cavity 40 into the combustion chamber 12. Thereby, a cooling of the combustion chamber 12 is