Patent ID: 7234917
Filing Date: 2007-06-26
Classification: F01D,F02C,Y02T

Abstract:
1. A rotary apparatus for a gas turbine engine, the apparatus comprising first and second stator assemblies and a rotor assembly mounted coaxially with respect to each other, the first stator assembly being upstream of the second stator assembly, and the second stator assembly being upstream of the rotor assembly, the rotor assembly comprising an annular array of rotor blades, and each stator assembly comprising an annular array of stator vanes, each vane having a leading edge and a trailing edge wherein the vanes of one of the stator assemblies are movable relative to the vanes of the other of the stator assemblies between a first condition in which each of the vanes of the second stator assembly is substantially in aerodynamic alignment with a respective one of the vanes of the first stator assembly, and the exit angle of gas from the stator assemblies is relatively high, and a second condition in which the exit angle of gas from the stator assemblies is relatively low and wherein the vanes of the second stator assembly are arranged wholly downstream of the vanes of the first stator assembly, and the vanes of the second stator assembly can be moved between the first and second conditions across the trailing edge of the respective vanes of the first stator assembly.