The invention relates to a turbomachine, as described and shown below.
In order to diminish structural component temperatures in the region of the final compressor stage and also a rotor shaft segment adjoining the compressor stage, cooling air is preferably blown in from an air distribution chamber between an outlet diffuser of the compressor and an associated combustion chamber, instead of using cooling air from the boundary layers in the flow conduit of the compressor in the region of the inner shrouds. The supply of cooling air into a cavity from the region in front of the combustion chamber occurs conventionally through a plurality of successively arranged intervening chambers of the outlet diffuser, which are in fluid connection with one another. The drawback of this cooling air supply, however, is that, owing to the plurality of intervening chambers, the cooling air undergoes a significant loss of pressure. If, in addition, radial supply lines, such as air bleed or oil lines traverse an intervening chamber, the pressure loss to which the cooling air is subject is augmented. In addition, leakage can occur in the region of inlet and outlet points of the supply lines due to the intervening chambers.