Abstract: An additive manufacturing extrusion head includes a nozzle for accepting and depositing a heated material onto a work surface and/or part. The nozzle includes a valve body and an internal poppet body moveable between positions to permit deposition of at least two bead sizes of heated material onto a work surface and/or part.

Abstract: An additive manufacturing extrusion head includes a nozzle for accepting and depositing a heated material onto a work surface and/or part. The nozzle includes a valve body and an internal poppet body moveable between positions to permit deposition of at least two bead sizes of heated material onto a work surface and/or part.

Abstract: A variable area fan nozzle for use with a gas turbine engine system includes a nozzle section that is attachable to a gas turbine engine for influencing flow through the fan bypass passage of the gas turbine engine. The nozzle section is movable between a first length and a second length that is larger than the first length to influence the flow. For example, the nozzle section includes members that are woven together to form collapsible openings that are open when the nozzle section is moved to the first length and that are closed when the nozzle section is moved to the second length.

Abstract: A fluid dynamic article includes a treated surface 32 and a transversely opposite surface 34. The treated surface 32 is substantially completely populated by a series of boundary layer flow guides 36 comprising longitudinally extending, laterally distributed, alternating troughs 40 and ridges 42. The depth d and height h of the troughs and ridges are substantially constant in a longitudinal direction. The opposite surface 34 has a configuration independent of the treated surface 32. The article may take the form of a nacelle 16 or 20 for an aircraft turbine engine.

Abstract: A variable area fan nozzle for use with a gas turbine engine system includes a nozzle section that is attachable to a gas turbine engine for influencing flow through the fan bypass passage of the gas turbine engine. The nozzle section is movable between a first length and a second length that is larger than the first length to influence the flow. For example, the nozzle section includes members that are woven together to form collapsible openings that are open when the nozzle section is moved to the first length and that are closed when the nozzle section is moved to the second length.

Abstract: Disclosed is a compliant seal arrangement 50 for restricting leakage through a gap between a first 54 and second 56 component. A seal assembly 58 is formed by stacking leaf strips 70 flat and sandwiching the stacked leaf strips 70 between a back plate 76 and a side plate 78. The leaf strips 70 are secured to the plates at a joint 84 along an edge 86 of the strips 70 that are in contact with the plates 76, 78. The seal assembly 58 is installed across the gap 52 to form the seal arrangement 50. The strips 70 extend from the first component 54, bridge the gap 52 and contact the second component 56, thereby restricting the leakage of fluid through the gap. Because the strips 70 are compliant, relative motion between the components 54, 56 deflects the strips 70, not causing permanent deformation.