초록 ▼

There is provided a hardwall fan case for encasing a forward fan in a gas turbine engine. The fan case has a stiff annular shell spaced radially outward from the tips of the fan blades and a flexible ring which is an integral structural part of the shell. The flexible ring has a frusto-conical shape

There is provided a hardwall fan case for encasing a forward fan in a gas turbine engine. The fan case has a stiff annular shell spaced radially outward from the tips of the fan blades and a flexible ring which is an integral structural part of the shell. The flexible ring has a frusto-conical shape with a lip adjacent to the blade trailing edge. The ring extends axially rearwardly from the fixed root to the free inner edge forming a cantilevering resilient ring. A hollow cavity defined between an inner surface of the shell and an outer surface of the flexible ring provides clearance for the flexible ring to deform radially outwardly on impact with a released blade, or to elastically flex on contact with the trailing edge blade tip during bird strike events.

대표청구항 ▼

[ We claim:] [1.]1. A hardwall fan case for encasing the radial periphery of a forward fan in a gas turbine engine, the fan including a circumferentially spaced apart array of fan blades, each blade having: a centre of gravity; a leading edge; a trailing edge; and a blade tip, the fan case comprisin

[ We claim:] [1.]1. A hardwall fan case for encasing the radial periphery of a forward fan in a gas turbine engine, the fan including a circumferentially spaced apart array of fan blades, each blade having: a centre of gravity; a leading edge; a trailing edge; and a blade tip, the fan case comprising:a stiff annular shell spaced radially outward from the tips of the fan blades:a flexible ring having a root circumferentially mounted to an inner surface of the shell, and an inner edge adjacent the trailing edges of the fan blade tips, the ring extending axially rearwardly from the root to the inner edge; anda cavity defined between an inner surface of the shell and an outer surface of the flexible ring.