Patent ID: 7942005

Claim:
A combustion chamber for a turbomachine, the chamber comprising: an outer coaxial circularly-symmetrical wall; an inner coaxial circularly-symmetrical wall extending inside the outer wall; an annular chamber end wall which connects the inner wall and the outer wall at upstream ends of the inner and outer walls; primary air inlet orifices and dilution air inlet orifices disposed on the inner and outer walls which are formed by die stamping, the orifices including edges projecting into the inside of the chamber; and stress relaxation or reduction means in the edges or in the vicinity of the edges of at least some of said orifices, said stress relaxation or reduction means consisting, for each orifice, of one, two, or three slots formed in the edge or around a portion of the edge of said orifice, each slot being connected at least one of its ends to a crack propagation stop orifice, wherein the slots include inner walls and the stop orifices include inner walls, said inner walls of the slots and of the stop orifices being inclined relative to a normal to the inner or outer wall and are substantially parallel to inner walls of microperforations formed in said inner or outer wall for cooling the chamber by air flowing through the slots, the stop orifices and the microperforations.