Abstract: A method of additively manufacturing a workpiece may include depositing and melting a material on a build plate by translating a deposition head of an additive manufacturing apparatus over the build plate to form a layer of deposited material; and heating the deposited material with an oven after the layer is deposited on the build plate, wherein the oven comprises a furnace body and an oven lid movable with the deposition head and disposable on the furnace body to enclose a heated build chamber of the oven.

Abstract: In some embodiments, apparatuses are provided herein useful to sealing a gap, such as a gap between a gas turbine engine nozzle flap and sidewall. An apparatus for sealing such a gap may be a plunger seal that includes a plunger, a retaining element, a guide pin, and a biasing element. The plunger includes a sealing edge and an actuating edge having at least one recess and an opening formed therein. The biasing element and a portion of the guide pin are nested in the recess. The retaining element anchor the plunger to the retaining element. The retaining element also anchors the plunger seal to the housing When installed in a gap, the housing engages the flap and the plunger engages the sidewall. The biasing element is under compression and urges the guide pin into the actuating edge to urge the plunger toward the sidewall and seal the gap.

Abstract: In some embodiments, apparatuses are provided herein useful to sealing a gap between a movable flap and a stationary structure, such as a gap between a gas turbine engine nozzle flap and a corresponding sidewall. An apparatus for sealing such a gap may be a dynamic skirted leaf seal which may include a flap arm and a wall arm opposite the flap arm. A distal end portion of the flap arm may comprise a first skirt and the distal end portion of the wall arm may comprise a second skirt that engages the first skirt. When positioned in a gap between the movable flap and the stationary structure, the skirted leaf seal may exert a force to urge the flap arm towards the flap and to urge the wall arm towards the structure to seal the gap.

Abstract: In some embodiments, apparatuses are provided herein useful to sealing a gap, such as a gap between a gas turbine engine nozzle flap and sidewall. An apparatus for sealing such a gap may be a plunger seal that includes a plunger, a retaining element, a guide pin, and a biasing element. The plunger includes a sealing edge and an actuating edge having at least one recess and an opening formed therein. The biasing element and a portion of the guide pin are nested in the recess. The retaining element anchor the plunger to the retaining element. The retaining element also anchors the plunger seal to the housing When installed in a gap, the housing engages the flap and the plunger engages the sidewall. The biasing element is under compression and urges the guide pin into the actuating edge to urge the plunger toward the sidewall and seal the gap.

Abstract: Apparatuses are provided herein useful to sealing a gap between a movable flap and a stationary structure, such as a gap between a gas turbine engine nozzle flap and a corresponding sidewall. An apparatus for sealing such a gap may be a dynamic skirted leaf seal which may include a flap arm, a wall arm opposite the flap arm, and a support arm disposed between the flap and wall arms. A distal end portion of the flap arm may comprise a first skirt and a distal end portion of the support arm may comprise a second skirt that engages the first skirt. When positioned in a gap, the skirted leaf seal may exert a force to urge the first flap arm towards the flap and to urge the wall arm and the support arm towards the structure to seal the gap.

Abstract: Apparatuses and methods are provided herein useful to sealing a dynamic gap between a moveable flap and a sidewall. The apparatus may be a seal assembly that includes a spring body, a clip coupled to a distal end of the spring body, and a wear shoe coupled to the clip. The spring body includes a flap arm adjacent the flap and a wall arm adjacent the sidewall. The flap arm and the wall arm bias away from one another when under compression in the gap. A distal end of the wall arm includes a first knuckle and a second knuckle that are pivotally coupled to the clip to create a hinge feature. The wear shoe is pivotally coupled to the clip to create another hinge feature. A distal end of the flap arm includes a skirt that is received by the clip seal an interior space of the spring body.

Abstract: Apparatuses are provided herein useful to sealing a gap between a movable flap and a stationary structure, such as a gap between a gas turbine engine nozzle flap and a corresponding sidewall. An apparatus for sealing such a gap may be a dynamic skirted leaf seal which may include a flap arm, a wall arm opposite the flap arm, and a support arm disposed between the flap and wall arms. A distal end portion of the flap arm may comprise a first skirt and a distal end portion of the support arm may comprise a second skirt that engages the first skirt. When positioned in a gap, the skirted leaf seal may exert a force to urge the first flap arm towards the flap and to urge the wall arm and the support arm towards the structure to seal the gap.

Abstract: In some embodiments, apparatuses are provided herein useful to sealing a gap between a movable flap and a stationary structure, such as a gap between a gas turbine engine nozzle flap and a corresponding sidewall. An apparatus for sealing such a gap may be a dynamic skirted leaf seal which may include a flap arm and a wall arm opposite the flap arm. A distal end portion of the flap arm may comprise a first skirt and the distal end portion of the wall arm may comprise a second skirt that engages the first skirt. When positioned in a gap between the movable flap and the stationary structure, the skirted leaf seal may exert a force to urge the flap arm towards the flap and to urge the wall arm towards the structure to seal the gap.

Abstract: An augmentor screech suppressor for a gas turbine engine includes a screech suppressor liner mounted on a screech housing and an actuator for translating the screech suppressor liner axially forward and aft, with the actuator located outside the outer duct of the engine. In a preferred embodiment in a variable cycle gas turbine engine, a variable area bypass injector (VABI) valve with a circumferentially conical surface slopes into the screech suppressor liner surface and inner and outer crank arms transfer linear motion from the actuator through the outer duct wall, cooperating with idler arms to translate the screech suppressor housing, and thus the VABI valve and screech suppressor linear, axially between open and closed valve position.

Abstract: A variable area bypass injector (VABI) for a variable cycle gas turbine engine includes a circumferentially continuous valve with a conical surface sloping into a screech suppressor surface, a circumferentially segmented seal attached to the diffuser, and a valve actuator located outside the outer duct of the engine. Each seal segment is spring loaded to allow for different axial movement between circumferentially adjacent segments, and has a seat portion complimentary to the valve conical surface for sealingly engaging the valve when in closed position. Additionally, the seal segments are shaped with a low aerodynamic profile and cooperate with the VABI conical surface, when the valve is in an open position, to provide an annular conic channel that keeps the bypass flow attached to the VABI valve and core flowpath walls as it is injected into the core gas stream.

Abstract: A variable area bypass injector (VABI) seal for a variable cycle gas turbine engine includes a circumferentially segmented seal attached to the diffuser. Each seal segment is spring loaded to allow for different axial movement between circumferentially adjacent segments, and has a seat portion complimentary to a VABI valve conical surface for sealingly engaging the VABI valve when the VABI valve is in closed position. Additionally, the seal segments are shaped with a low aerodynamic profile and cooperate with the VABI valve conical surface, when the valve is in an open position, to provide an annular conic channel that keeps the bypass flow attached to the VABI valve and core flowpath walls as it is injected into the core gas stream.

Abstract: First and second annular clamping elements are coupled together by an annular clamping ring and a Belleville spring coupled to the clamping ring urges the clamping elements toward each other so that they grip the annular ceramic piece without the need to utilize fasteners which would call for the machining of the annular ceramic piece to weaken it. The clamping elements thus support the ceramic piece and can couple it to an annular gas turbine machine frame or the like.

Abstract: A seal assembly includes a housing having a plenum, a leaf seal rotatably joined to the housing to define a hinge. The leaf seal includes flow channels which receive a cooling fluid from the plenum for both cooling the leaf seal and preventing leakage of gases through the hinge.

Abstract: Large and small seal ring segments are interconnected to allow for circumferentially overlapping sliding engagement therebetween. The seal ring segments form an annular seal ring having a radial flange which is mounted within an annular radial groove formed in one end of a conduit. An adjoining conduit is formed with a sealing band having a spherical contour for engaging a cylindrical base portion of the seal ring with an axially slidable and pivotable fit.