Patent ID: 7155913

Claim:
An annular combustion chamber, said combustion chamber comprising an outer axial wall, an inner axial wall and a chamber bottom end connecting said outer and inner axial walls, the chamber bottom end being provided firstly with several injection orifices intended at least to inject fuel inside the combustion chamber, and secondly passages allowing at least an initiation of a first cooling air film along a hot inner surface of the outer axial wall and of a second cooling air film along a hot inner surface of the inner axial wall, said outer axial wall and inner axial wall being multi-perforated roughly over their full length in order to enable reinforcement of the first and second cooling air films, wherein said outer axial wall and inner axial wall are provided with a first zone of perforations in an upstream part, formed such that cooling air is introduced inside the combustion chamber toward an upstream side of said combustion chamber, wherein the chamber bottom end has an inter-heads wall provided, from the upstream side of the combustion chamber toward a downstream side of the combustion chamber, with a first zone of perforations formed such that cooling air is introduced toward said upstream side inside the combustion chamber, with a transition zone of perforations, and with a second zone of perforations formed such that a cooling air flow is introduced into said combustion chamber toward said downstream side of the combustion chamber.