Abstract: An aft heat shield for a fuel nozzle tip includes: an annular shield wall; an annular shield flange extending radially outward from an aft end of the shield wall; an annular baffle flange surrounding the conical section, and disposed such that an axial gap is defined between the shield flange and the baffle flange, the baffle flange including a radially outer rim extending axially forward therefrom; and a plurality of impingement cooling holes passing through the baffle flange and oriented to as to direct air flow towards the shield wall.

Abstract: An additive manufacturing apparatus includes: first and second spaced apart side walls extending along a pre-defined path and defining a build chamber therebetween; one or more build units mounted for movement along the pre-defined path, the one or more build units collectively including: a powder dispenser positioned above the build chamber; an applicator configured to scrape powder dispensed into the build chamber; and a directed energy source configured to fuse the scraped powder; a moveable build platform disposed between the first and second spaced-apart side walls; and an actuator assembly connected to the build platform, the actuator assembly being configured to rotate and move the build platform continuously along a build axis to provide a spiral movement and permit a part to be built continuously in a spiral configuration.

Abstract: An additive manufacturing machine includes a heated gas circulation system for regulating the temperature of additive powder throughout an annular powder bed and parts formed therein. The additive manufacturing machine includes an annular build platform defining a plurality of perforations and a heated gas supply that provides a flow of heated air through the plurality of perforations and the powder bed. The additive manufacturing machine further includes a plurality of fairings for guiding the flow of heated gas to temperature sensitive regions to minimize temperature gradients within the powder bed which might otherwise result in distortion, thermal stresses, or cracking in the finished part.

Abstract: An additive manufacturing machine includes a heated gas circulation system for regulating the temperature of additive powder throughout an annular powder bed and parts formed therein. The additive manufacturing machine includes an annular build platform defining a plurality of perforations and a heated gas supply that provides a flow of heated air through the plurality of perforations and the powder bed. The additive manufacturing machine further includes a plurality of fairings for guiding the flow of heated gas to temperature sensitive regions to minimize temperature gradients within the powder bed which might otherwise result in distortion, thermal stresses, or cracking in the finished part.

Abstract: An aft heat shield for a fuel nozzle tip includes: an annular shield wall; an annular shield flange extending radially outward from an aft end of the shield wall; an annular baffle flange surrounding the conical section, and disposed such that an axial gap is defined between the shield flange and the baffle flange, the baffle flange including a radially outer rim extending axially forward therefrom; and a plurality of impingement cooling holes passing through the baffle flange and oriented to as to direct air flow towards the shield wall.

Abstract: An aft heat shield for a fuel nozzle tip includes: an annular shield wall; an annular shield flange extending radially outward from an aft end of the shield wall; an annular baffle flange surrounding the conical section, and disposed such that an axial gap is defined between the shield flange and the baffle flange, the baffle flange including a radially outer rim extending axially forward therefrom; and a plurality of impingement cooling holes passing through the baffle flange and oriented to as to direct air flow towards the shield wall.

Abstract: An additive manufacturing apparatus includes: first and second spaced apart side walls extending along a pre-defined path and defining a build chamber therebetween; one or more build units mounted for movement along the pre-defined path, the one or more build units collectively including: a powder dispenser positioned above the build chamber; an applicator configured to scrape powder dispensed into the build chamber; and a directed energy source configured to fuse the scraped powder; a moveable build platform disposed between the first and second spaced-apart side walls; and an actuator assembly connected to the build platform, the actuator assembly being configured to rotate and move the build platform continuously along a build axis to provide a spiral movement and permit a part to be built continuously in a spiral configuration.

Abstract: An aft heat shield for a fuel nozzle tip includes: an annular shield wall; an annular shield flange extending radially outward from an aft end of the shield wall; an annular baffle flange surrounding the conical section, and disposed such that an axial gap is defined between the shield flange and the baffle flange, the baffle flange including a radially outer rim extending axially forward therefrom; and a plurality of impingement cooling holes passing through the baffle flange and oriented to as to direct air flow towards the shield wall.

Abstract: A modeling system predicts natural frequency responses in tube sub-systems including shrouded bellows components. The system determines a stiffness multiplier from input values and uses the determined flexibility factor to determine the natural frequency responses. The input values include geometry inputs and dynamic operating condition inputs. The flexibility factor is determined with a regression equation. The regression equation, based on dynamic stiffness test data of various shrouded bellows configurations, permits the system to characterize the shrouded bellows using a geometry element that includes an assigned flexibility factor based on dynamic stiffness test data.

Abstract: An article assembly comprising a plurality of members includes a multi-layered brazed joint provided in the assembly between a first member that can be affected adversely by thermal exposure at a limiting and a second member requiring exposure, such as for brazing, at least at the limiting temperature. The assembly is provided with a multi-layered brazed joint directly or indirectly between such members by brazing to the second member a second brazing alloy that can be brazed at a temperature required to braze the second member, providing a preform. The assembly is brazed to include the first member by brazing members of the assembly together with a first brazing alloy, brazing at a temperature less than the limiting temperature, brazed at the second brazing alloy.