Method for perforating a wall of a combustion chamber , said method comprising: - a step to calculate mechanical stresses applied on said wall for a use of said wall in a first zone and a second zone, after the calculation step , - a step to perforate at least one orifice having an outer end with a circular cross-section in a first determined zone of said wall , said perforation being made using a tool with a cross-section dependent on the mechanical stresses calculated in said first determined zone where the mechanical stresses F1 are perpendicular and parallel to the axis (A) of the combustion chamber, the perpendicular and parallel mechanical stresses F1 being noticeably similar, a reiteration of the perforation step in a second determined zone of said wall of at least one orifice having an outer end with an elliptical cross-section which major axis (Ga) is parallel to the axis (A) of the combustion chamber, said perforation step being made using a tool with a cross-section dependent on the mechanical stresses calculated in said second determined zone where the mechanical stresses F2 are parallel to the axis (A) of the combustion chamber, for a plurality of perforated orifices each orifice being perforated along a specific perforation axis passing through the same line circumferential to the axis (A) of the combustion chamber , all of the perforation axes intersecting at a single point. - a step to calculate mechanical stresses applied on said wall for a use of said wall in a first zone and a second zone, after the calculation step , - a step to perforate at least one orifice having an outer end with a circular cross-section in a first determined zone of said wall , said perforation being made using a tool with a cross-section dependent on the mechanical stresses calculated in said first determined zone where the mechanical stresses F1 are perpendicular and parallel to the axis (A) of the combustion chamber, the perpendicular and parallel mechanical stresses F1 being noticeably similar, - a step to perforate at least one orifice having an outer end with a circular cross-section in a first determined zone of said wall , said perforation being made using a tool with a cross-section dependent on the mechanical stresses calculated in said first determined zone where the mechanical stresses F1 are perpendicular and parallel to the axis (A) of the combustion chamber, the perpendicular and parallel mechanical stresses F1 being noticeably similar, a reiteration of the perforation step in a second determined zone of said wall of at least one orifice having an outer end with an elliptical cross-section which major axis (Ga) is parallel to the axis (A) of the combustion chamber, said perforation step being made using a tool with a cross-section dependent on the mechanical stresses calculated in said second determined zone where the mechanical stresses F2 are parallel to the axis (A) of the combustion chamber, for a plurality of perforated orifices each orifice being perforated along a specific perforation axis passing through the same line circumferential to the axis (A) of the combustion chamber , all of the perforation axes intersecting at a single point. <EOS>