MID-TURBINE DUCT FOR GEARED GAS TURBINE ENGINE

摘要

A mid-turbine vaned duct comprises a duct upstream end to abut a downstream end of an upstream turbine rotor. A duct downstream end abuts an upstream end of a downstream turbine rotor. The vaned duct includes a first gap extending between the upstream turbine rotor and an upstream end of a vane positioned within the duct, intermediate the vaned duct upstream and downstream ends. A second gap is defined between a downstream end of the vane and the downstream turbine rotor. The first gap extends for a first axial distance and the second gap extends for a second axial distance. A length ratio of the first axial distance to the second axial distance is less than or equal to 2.0.

主权项

1. A mid-turbine vaned duct comprising:
a duct upstream end to abut a downstream end of an upstream turbine rotor, and a duct downstream end to abut an upstream end of a downstream turbine rotor; said vaned duct including a first gap extending between said upstream turbine rotor and an upstream end of a vane positioned within said duct, intermediate said vaned duct upstream and downstream ends, a second gap defined between a downstream end of said vane and said downstream turbine rotor; and said first gap extending for a first axial distance and said second gap extending for a second axial distance, and a length ratio of said first axial distance to said second axial distance being less than or equal to 2.0.