Combustion chamber for a turbomachine

A combustion chamber for a turbomachine, comprising:

• a bottom wall comprising at least one opening,
• at least one sleeve mounted upstream of the bottom wall and fixed to the bottom wall,
• a closing ring defining an annular groove with the sleeve and fixed to the sleeve,
• at least one air and fuel injection system, having an axis, mounted in the opening of the bottom wall, the injection system comprising an annular flange extending radially with respect to said axis, mounted in said groove with a radial clearance,
• a baffle situated downstream of the bottom wall, fixed to the sleeve and/or to the bottom wall, comprising a radially internal part situated axially between the bottom wall and a downstream end of the injection system,
• wherein the injection system comprises at least one projecting part configured to be introduced into one of a recessed part of the baffle and a first angular mounting position of the injection system with respect to the baffle, said projecting part being configured to come axially into abutment on a radial face or downstream face of the baffle, or respectively, of the injection system, in a second angular position for holding the injection system with respect to the baffle, said projecting part being angularly offset from the recessed part in said second position.