Turbomachine i.e. twin-spool turbine engine, for use in civil aircraft, has supply unit with annular air circulation cavity that traverses high pressure turbine from downstream till upstream radially towards interior with respect to space

摘要

The turbomachine (42) has high and low pressure compressors traversed via an annular gas flow space i.e. primary stream (10), and compressing a primary gas flow (12). High and low pressure turbines (14, 16) are traversed via the space to drive the respective high and low pressure compressors. A sampling unit samples a portion of flow in the high pressure compressor to form a purging and ventilation flow (66). A supply unit has an annular air circulating cavity (51) that traverses the high pressure turbine from downstream till upstream radially towards an interior with respect to the space.