A steam turbine may include a casing defining an interior cavity, wherein the casing comprises a first casing half and a second casing half, which are connected to one another to form the casing, wherein an interior surface of the first casing half has a first portion with a first curvature and a second portion with a second curvature, wherein the first curvature and the second curvature are different, and wherein an interior surface of the second casing half has a first portion with a first curvature and a second portion with a second curvature, wherein the first curvature and the second curvature are different. An interior surface of the casing may have a substantially oval-shaped cross-section. Internal pressure acting on the oval interior surface allows better sealing at the split line.

A fan assembly for gas turbine engine according to an exemplary embodiment of this disclosure includes, among other possible things, a plurality of fan blades rotatable about a fan rotation axis, each of the plurality of fan blades movable about an axis transverse to the fan rotation axis, a fan nacelle partially surrounding the plurality of fan blades, and a pitch mechanism coupled to the plurality of blades that changes an angle of pitch for each of the plurality of blades corresponding to a circumferential position of the fan blade about the fan rotation axis.

A fan assembly for gas turbine engine according to an exemplary embodiment of this disclosure includes, among other possible things, a plurality of fan blades rotatable about a fan rotation axis, each of the plurality of fan blades movable about an axis transverse to the fan rotation axis, a fan nacelle partially surrounding the plurality of fan blades, and a pitch mechanism coupled to the plurality of blades that changes an angle of pitch for each of the plurality of blades corresponding to a circumferential position of the fan blade about the fan rotation axis.

The invention relates to a method for controlling a pitch angle of the vanes or blades of a propellant body of a turbine engine, comprising generating a pitch command (i.sub.final) according to a rotational speed of the propeller (XN.sub.mes) and a speed setpoint (XN.sub.cons), the method comprises a nominal regulating chain (13), wherein the pitch command is further generated according to a value of a pitch angle (mes) of the vanes or blades of the propellant body, and an off-nominal regulating chain (16), wherein the pitch command is generated independently of a value of a pitch angle of the vanes or blades of the propellant body.

A propulsion device that defines a central axis and a circumferential direction is provided. The propulsion device may include a core engine and a core casing. The core engine may include an engine shaft extending along the central axis. The core casing may have an inner surface and an outer surface. The core casing may extend along the circumferential direction about the propulsion device, as well as along the central axis from a forward end to an aft end. The core casing may define a primary air flowpath having an annular inlet at the forward end and an exhaust at the aft end. The core casing may further define a reverse flow passage extending from an outer surface entrance to an inner surface exit.

A propulsion device that defines a central axis and a circumferential direction is provided. The propulsion device may include a core engine and a core casing. The core engine may include an engine shaft extending along the central axis. The core casing may have an inner surface and an outer surface. The core casing may extend along the circumferential direction about the propulsion device, as well as along the central axis from a forward end to an aft end. The core casing may define a primary air flowpath having an annular inlet at the forward end and an exhaust at the aft end. The core casing may further define a reverse flow passage extending from an outer surface entrance to an inner surface exit.

A blower assembly for providing air to an airframe system, including a rotor configured to be mechanically coupled to a spool of a gas turbine engine and a flow modifier configured to receive and/or direct flow to the rotor; wherein the blower assembly is configured to permit relative movement between the rotor and the flow modifier to move between: a compressor configuration in which the rotor is configured to be driven to rotate by the spool and to receive and compress air from the gas turbine engine, and discharge the compressed air for supply to the airframe system; and a turbine configuration in which the rotor is configured to receive air from an external air source to drive the spool to rotate.

A rotary assembly for driving spool rotation includes a rotor and a flow modifier. The rotor is mechanically coupled to a spool of a gas turbine engine. The flow modifier receives flow from and/or direct flow to the rotor. The rotary assembly permits relative movement between the rotor and the flow modifier to move between: a turbine configuration wherein the rotor receives air from an external air source to drive the spool to rotate; and a compressor configuration wherein the rotor is driven to rotate by the spool and to receive and compress air from the gas turbine engine, and discharge the compressed air for supply to the airframe system. The rotary assembly also includes controller to control relative movement between the rotor and the flow modifier through a range of turbine positions of the turbine configuration to vary a torque applied to the rotor for driving the spool.

A turbine system includes a housing with a fluid inlet, a fluid outlet, and a rotational mount, and a turbine mounted on the rotational mount. The turbine comprises a first disk with a through-hole, a plurality of first foils arranged radially, and a last disk with a smaller through-hole and. The first foils define a fluid path from the fluid inlet to the fluid outlet. The design allows for efficient fluid flow and rotation of the turbine about the axis, providing an effective and reliable turbine system for various applications.

A turbine inlet includes an annular housing and a main inlet port, a steam outlet, and a flow diversion port in the annular housing. A center axis of flow from the flow diversion port avoids intersecting a center axis of the steam outlet. A turbine system includes a turbine inlet, a fluid supply, and a flow diversion supply conduit. The turbine inlet has an annular housing including a main inlet port therein, a steam outlet therein, and a flow diversion port therein. The flow diversion supply conduit couples the fluid supply to the flow diversion port. A method of retrofitting a turbine inlet in a turbine system comprises opening a flow diversion port through an annular housing of a turbine inlet, connecting a flow diversion supply conduit to the flow diversion port, and connecting the flow diversion supply conduit to the fluid supply.