Combustion chamber arrangement

A combustion chamber arrangement comprising:

• an outer casing;
• an inner casing;
• an annular combustion chamber;
• and
• a heat shield, wherein:
• the annular combustion chamber is arranged radially between the inner casing and the outer casing,
• the annular combustion chamber comprises an inner annular wall, an outer annular wall, an upstream end wall, a plurality of fuel injectors, a metering wall and a plurality of air swirlers,
• the metering wall is arranged upstream of the upstream end wall,
• the upstream end wall has a first plurality of circumferentially spaced apertures,
• the metering wall has a second plurality of circumferentially spaced apertures,
• each of the second plurality of circumferentially spaced apertures in the metering wall is aligned with a respective one of the first plurality of circumferentially spaced apertures in the upstream end wall,
• each of the plurality of fuel injectors is arranged in the respective one of the first plurality of circumferentially spaced apertures in the upstream end wall,
• each air swirler of the plurality of air swirlers is aligned with a respective one of the plurality of fuel injectors,
• each air swirler of the plurality of air swirlers is arranged axially between the upstream end wall and the metering wall, the metering wall having a plurality of metering holes arranged to provide a controlled supply of air to each air swirler of the plurality of air swirlers,
• the annular combustion chamber is secured to the inner casing or the outer casing by a first mounting feature,
• the annular combustion chamber is mounted at an upstream end of the annular combustion chamber,
• one of the upstream end wall and the metering wall is secured to the inner casing or the outer casing by the first mounting feature,
• the first mounting feature is annular,
• the first mounting feature has a plurality of metering apertures to supply air to a first annular chamber between the inner casing and the annular combustion chamber or to a second annular chamber between the outer casing and the annular combustion chamber,
• the heat shield is arranged downstream of the upstream end wall,
• the upstream end wall supports the heat shield,
• the annular combustion chamber comprises a plurality of sealing rings, each fuel injector of the plurality of fuel injectors locating in and abutting a respective one of the plurality of sealing rings, each sealing ring of the plurality of sealing rings carrying a respective associated air swirler of the plurality of air swirlers,
• each air swirler of the plurality of air swirlers is a radial flow air swirler,
• each sealing ring of the plurality of sealing rings has a radially extending flange and an upstream end of vanes of the radial flow air swirler being secured to the radially extending flange of each sealing ring of the plurality of sealing rings and the downstream ends of the vanes of the radial flow air swirler being secured to an L-shaped member, and
• the radially extending flange of each sealing ring abuts the metering wall and the L-shaped member abuts the upstream end wall.

A combustion chamber arrangement comprising:

• an outer casing;
• an inner casing;
• an annular combustion chamber;
• and
• a heat shield, wherein:
• the annular combustion chamber is arranged radially between the inner casing and the outer casing,
• the annular combustion chamber comprises an inner annular wall, an outer annular wall, an upstream end wall, a plurality of fuel injectors, a metering wall and a plurality of air swirlers,
• the metering wall is arranged upstream of the upstream end wall,
• the upstream end wall has a first plurality of circumferentially spaced apertures,
• the metering wall has a second plurality of circumferentially spaced apertures,
• each of the second plurality of circumferentially spaced apertures in the metering wall is aligned with a respective one of the first plurality of circumferentially spaced apertures in the upstream end wall,
• each of the plurality of fuel injectors is arranged in the respective one of the first plurality of circumferentially spaced apertures in the upstream end wall,
• each air swirler of the plurality of air swirlers is aligned with a respective one of the plurality of fuel injectors,
• each air swirler of the plurality of air swirlers is arranged axially between the upstream end wall and the metering wall, the metering wall having a plurality of metering holes arranged to provide a controlled supply of air to each air swirler of the plurality of air swirlers,
• the annular combustion chamber is secured to the inner casing or the outer casing by a first mounting feature,
• the annular combustion chamber is mounted at an upstream end of the annular combustion chamber,
• one of the upstream end wall and the metering wall is secured to the inner casing or the outer casing by the first mounting feature,
• the first mounting feature is annular,
• the first mounting feature has a plurality of metering apertures to supply air to a first annular chamber between the inner casing and the annular combustion chamber or to a second annular chamber between the outer casing and the annular combustion chamber,
• the heat shield is arranged downstream of the upstream end wall,
• the upstream end wall supports the heat shield,
• the plurality of metering holes of the metering wall comprise elongate metering slots extending circumferentially with respect to each aperture of the second plurality of circumferentially spaced apertures in the metering wall, the elongate metering slots are arranged at a radius greater than an outer radius of an associated radial flow swirler with respect to an axis of the respective aperture of the second plurality of circumferentially spaced apertures in the metering wall.