Abstract:
A mounting system for a gas turbine engine includes a compressor case portion, an inlet frame, an outlet frame, and a mounting structure. The compressor case portion houses rotatable compressor blades. The inlet frame connects to an inlet end of the compressor case. The outlet frame connects to an outlet end of the compressor case portion at an end opposite the compressor case inlet end. An axially fore mounting structure of the mounting structure connects to the inlet frame. An axially aft mounting structure of the mounting structure connects to the outlet frame. A bridging structure of the mounting structure is offset from the compressor case and connects the fore and aft mounting structures, thereby bridging engine loads across the inlet and outlet frames to reduce load induced distortion of the compressor case portion.
Abstract:
A gas turbine engine includes a core engine including a central engine axis and a nacelle surrounding the core engine. At least a portion of the nacelle is axially movable relative to the core engine between open and fully closed positions. A ceramic-based liner is located at an aft portion of the core engine. The ceramic-based component mechanically interfaces with the movable portion of the nacelle when the nacelle is in the fully closed position. A turbine section and a method of accommodating thermally-induced dimensional change of engine components are also disclosed.
Abstract:
A nozzle assembly for a dual gas turbine engine propulsion system includes a housing mountable proximate to a first bypass passage of a first gas turbine engine and a second bypass passage of a second gas turbine engine, first and second upper doors, and first and second lower doors. Each of the first and second upper doors and the first and second lower doors are pivotally mounted to the housing for movement between a stowed position and a deployed position in which airflow through the first and second bypass passages is redirected relative to respective centerline axes of the first and second gas turbine engines.
Abstract:
In a featured embodiment, a gas turbine engine has a first compressor rotor driven by a first turbine rotor, and a second compressor rotor driven by a second turbine rotor. The second compressor rotor is upstream of the first compressor rotor and the first turbine rotor is upstream of the second turbine rotor. An air mixing system taps air from a location upstream of the first compressor rotor for delivery to an environmental control system. The air mixing system receives air from a first air source and a second air source. The first air source includes air at a first pressure upstream of the first compressor rotor. The second air source includes air at a lower second pressure. At least one valve controls a mixture of air from the first and second sources to achieve a predetermined pressure for the environmental control system.
Abstract:
A gas turbine engine (20) has a propulsion unit and a gas generating core (28). The propulsion unit includes a fan (24) and a free turbine (42) that is connected to drive the fan (24) about a first axis (X). The gas generating core (28) includes a compressor (30), a combustion section (36) and a gas generating core turbine (34). The compressor (30) and the gas generating core turbine (34) are configured to rotate about a second axis (Y). An inlet duct (46) is configured to deliver air from the fan (24) to the gas generating core (28). The inlet duct (46) has a crescent shaped cross-section near the fan (24).
Abstract:
A gas generator (22) has at least one compressor rotor (24), at least one gas generator turbine rotor (30) and a combustion section (32). A fan drive turbine (36) is positioned downstream of a path of the products of combustion having passed over the at least one gas generator turbine rotor (30). The fan drive turbine (36) drives a shaft (40) and the shaft engages gears to drive at least three fan rotors (42,44,46,48).
Abstract:
An electromechanical system for a gas turbine engine includes a mechanical component (50) located at a first side of a firewall (44) of a gas turbine engine, and an electrical motor (52) located at a second side of the firewall (44) and configured to drive the mechanical component (50). The electrical motor (52) is mechanically connected to the mechanical component (50) through a firewall opening (56) in the firewall (44), the first side having a higher operating temperature than the second side. An electrical connection (60, 62) extends between the mechanical component (50) and the electrical motor (52) via the same firewall opening (56).