Combustion chamber arrangement

A combustion chamber arrangement comprising an annular combustion chamber, a plurality of circumferentially arranged vanes, a radially inner sealing ring and a radially outer sealing ring,

• the annular combustion chamber comprising a radially inner annular wall structure, a radially outer annular wall structure spaced radially outwardly from the radially inner annular wall structure and an axially upstream annular wall structure, an upstream end of the radially inner annular wall structure being secured to a radially inner end of the axially upstream annular wall structure and an upstream end of the radially outer annular wall structure being secured to a radially outer end of the axially upstream annular wall structure,
• the vanes being arranged at the axially downstream end of the annular combustion chamber, each of the vanes comprising a radially inner platform, a radially outer platform and an aerofoil extending radially between the radially inner platform and the radially outer platform,
• the radially inner sealing ring being arranged to form a seal between a downstream end of the radially inner annular wall structure and the radially inner platforms of the vanes and the radially outer sealing ring being arranged to form a seal between a downstream end of the radially outer annular wall structure and the radially outer platforms of the vanes,
• at least a portion of the axial length of the radially inner sealing ring comprising a dual wall structure, the dual wall structure including a radially inner wall and a radially outer wall spaced radially from the radially inner wall to define at least one chamber, the radially inner wall having a plurality of apertures to supply coolant into the at least one chamber and the radially outer wall having a radially outer surface and a plurality of effusion cooling apertures to supply coolant from the at least one chamber onto the radially outer surface of the radially outer wall.