Gas turbine with HP and LP counter-rotating turbines

摘要

The turbine has a low pressure (LP) turbine with moving wheels (56-1-56-3) alternating with nozzles (52-1, 52-2). The wheels rotate in a direction opposite to direction of rotation of a moving wheel (46) of a high pressure (HP) turbine (40). An inter-turbine casing (60) includes an inner wall (62) and an outer wall (64) defining a passage (66) between the turbines with the structural arms (68) extending across the passage between the walls. The turbine does not include a nozzle for deflecting a stream between an outlet from the HP turbine and the wheel of the LP turbine.