초록 ▼

A turbofan gas turbine engine (10) comprises a fan rotor (32) carrying a plurality of radially extending fan blades (34). A fan blade containment assembly (38) surrounds the fan blades (34) and the fan blade containment assembly (38) comprises a generally cylindrical, or frustoconical, metal casing

A turbofan gas turbine engine (10) comprises a fan rotor (32) carrying a plurality of radially extending fan blades (34). A fan blade containment assembly (38) surrounds the fan blades (34) and the fan blade containment assembly (38) comprises a generally cylindrical, or frustoconical, metal casing (40). The casing (40) comprises an annular hook (54) positioned axially upstream of the tip (37) of the fan blade (34). The annular hook (54) extends in a radially inwardly and axially downstream direction from the metal casing (40) towards the tip (37) of the fan blade (34). The metal casing (40) has a containment portion (A) downstream of the annular hook (54) and substantially in the plane of the leading edge of the tip (37) of the fan blade (34). The containment portion (A) of the casing (40) has a greater diameter than the diameter of the casing (40) at the annular hook (54) to restrain upstream movement of a detached fan blade (34).

대표청구항 ▼

1. A gas turbine engine rotor blade containment assembly comprising a generally cylindrical, or frustoconical, casing arranged in operation coaxially around a rotor carrying a plurality of rotor blades, the casing having an upstream portion upstream of a plane containing the most upstream point of t

1. A gas turbine engine rotor blade containment assembly comprising a generally cylindrical, or frustoconical, casing arranged in operation coaxially around a rotor carrying a plurality of rotor blades, the casing having an upstream portion upstream of a plane containing the most upstream point of the leading edge of the rotor blades, the casing having a containment portion downstream of the plane containing the most upstream point of the leading edge of the rotor blades, at least a part of the containment portion of the casing having a greater diameter than the diameter of the upstream portion of the casing, the containment portion having a zone substantially in the plane of the leading edge of the tips of the rotor blades, the containment portion of the casing having a maximum diameter in the zone substantially in the plane of the leading edge of the tips of the rotor blades to restrain upstream movement of a detached rotor blade, the casing being rigid to substantially restrain a fan blade from passing therethrough, said containment portion progressively increasing in diameter from the upstream portion of the casing to the zone substantially in the plane of the leading edge of the tips of the rotor blades and the containment portion progressively increasing in diameter from a plane containing or downstream of the trailing edges of the rotor blades to form a substantially radially outwardly dished shape in the casing.