초록 ▼

A coolable stator assembly is positioned outwardly of an array of rotor blades in a high by pass turbofan gas turbine engine as disclosed. The stator assembly includes case tied air seals positioned by rails and a shield which extends circumferentially about the rails and the rail connector section

A coolable stator assembly is positioned outwardly of an array of rotor blades in a high by pass turbofan gas turbine engine as disclosed. The stator assembly includes case tied air seals positioned by rails and a shield which extends circumferentially about the rails and the rail connector section extending between the rails. Various constructions details for improving the control of clearances and circumferential temperature gradients in the rails are developed. In one particular embodiment, cooling air tubes are employed with the shield.

대표청구항 ▼

For a high bypass turbofan gas turbine engine of the type which is disposed in a nacelle compartment, the turbofan engine having an annular flow path for working medium gases, a rotor assembly which includes rows of rotor blades extending outwardly across the working medium flow path and a stator as

For a high bypass turbofan gas turbine engine of the type which is disposed in a nacelle compartment, the turbofan engine having an annular flow path for working medium gases, a rotor assembly which includes rows of rotor blades extending outwardly across the working medium flow path and a stator assembly which includes an outer case and seal structure disposed about the rotor blades, the seal structure including a first outer air seal which is attached to the outer case and which circumscribes a row of rotor blades, and a second outer air seal which is attached to the outer case and which circumscribes another row of rotor blades, a stator assembly which comprises: an outer case which extends circumferentially about the working medium flow path, the outer case having an interior surface bounding a flow path for cooling air in flow communication with the working medium flow path, an exterior surface facing the interior of the nacelle compartment, a first rail and a second rail spaced axially from the first rail, the rails extending circumferentially about the outer case, extending radially outward from the outer surface of the outer case into the nacelle compartment, and being located radially outward of at least one of the outer air seals, and, a rail connector section of the outer case which extends axially to join the first rail and the second rail; and, a shield disposed in the nacelle compartment which is spaced radially from the outer case leaving an annular chamber therebetween which is in flow communication with the nacelle compartment, the shield extending axially beyond the rails and over the rail connector section to reduce circumferential temperature gradients in the rails and in the case by shielding the rails and the rail connector section from temperature gradients within the nacelle.