INTERMEDIATE CASING FOR A TURBOFAN ENGINE

摘要

An intermediate casing comprising an inner annular hub, an outer annular barrel and an annular part for separating flows situated between the hub and the outer barrel. A primary stream is delimited between the hub and the separation part. A secondary stream is delimited between the separation part and the outer barrel. At least one hollow arm extends radially from the hub to the outer barrel, passing through the primary and secondary streams. A transmission shaft extends radially in the hollow arm. The hollow arm comprises a hydraulic-fluid outlet situated downstream of the transmission shaft. The arm further comprises a bypass channel or pocket able to bypass the transmission shaft.

主权项

1. An intermediate casing for a turbofan comprising a radially internal annular hub, a radially external annular barrel and an annular flow-separation part situated radially between the hub and the outer barrel, a primary stream for flow of a primary flow being delimited between the hub and the separation part, a secondary stream allowing flow of a secondary flow being delimited between the separation part and the outer barrel, at least one hollow arm extending radially from the hub to the outer barrel passing through the primary and secondary streams, a transmission shaft extending radially in said hollow arm, wherein the hollow arm comprises a hydraulic-fluid outlet situated downstream of the transmission shaft with respect to the direction of circulation of the primary flow or secondary flow, said arm further comprising a bypass channel or pocket able to bypass the transmission shaft and extending from upstream to downstream of said transmission shaft.