US 12,078,351 B2
Double wall for aircraft gas turbine combustion chamber and method of producing same
Thomas Sébastien Alexandre Gresy, Moissy-Cramayel (FR); Jean-Paul Didier Autret, Moissy-Cramayel (FR); and Nicolas Roland Guy Savary, Moissy-Cramayel (FR)
Assigned to SAFRAN HELICOPTER ENGINES, Bordes (FR)
Appl. No. 18/258,356
Filed by SAFRAN HELICOPTER ENGINES, Bordes (FR)
PCT Filed Dec. 20, 2021, PCT No. PCT/EP2021/086791
§ 371(c)(1), (2) Date Jun. 20, 2023,
PCT Pub. No. WO2022/144206, PCT Pub. Date Jul. 7, 2022.
Claims priority of application No. 2100013 (FR), filed on Jan. 4, 2021.
Prior Publication US 2024/0044492 A1, Feb. 8, 2024
Int. Cl. F23R 3/00 (2006.01)
CPC F23R 3/005 (2013.01) [F23R 3/002 (2013.01); F23R 2900/03043 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A method for making a double wall for a combustion chamber for an aircraft gas turbine, the double wall comprising:
an inner wall configured to be in contact with a combustion reaction; and
an outer wall, spaced apart from the inner wall, the inner wall and the outer wall being additively manufactured, the outer wall comprising a plurality of ports so as to allow circulation of cooling air flow, external to the outer wall, which cool the inner wall, the inner wall being free from perforation so as to prohibit any circulation of the cooling air flow to a center of the combustion chamber, wherein the inner wall comprises a plurality of projecting members projecting towards the outer wall, each of the projecting members comprising a foot portion and a cylindrical head portion of circular cross-section, the cylindrical head portion extending into a circular cross-section port of the plurality of ports in order to define a calibrated flow cross-section between the projecting member and the port for the passage of the cooling air flow, wherein the inner wall and the outer wall are secured to a temporary support by incremental addition of metal powders and then unsecured from the temporary support by cutting at an interface between the inner wall, the outer wall, and the temporary support.