Abstract: A method of making an impeller includes building the impeller in a layer by layer process in a build direction along the rotational axis starting from a base of the hub. The plurality of blades includes a plurality of perforated blades that support the shroud during additively manufacturing the impeller. The method can include installing the impeller in a fuel pump, air compressor, or the like, without removing the perforated blades from the impeller.

Abstract: A method of making an impeller includes building the impeller in a layer by layer process in a build direction along the rotational axis starting from a base of the hub. The plurality of blades includes a plurality of perforated blades that support the shroud during additively manufacturing the impeller. The method can include installing the impeller in a fuel pump, air compressor, or the like, without removing the perforated blades from the impeller.

Abstract: A multi-stage fluid pump system can include a first stage configured to provide a first pressure and a second stage configured to provide a second pressure. The pump system can be configured to prevent output of the second stage in a first stage mode such that only the first pressure is output from the first stage and second stage and to allow output of the second stage in a multi-stage mode such that there is a combined pressure output from the first stage and the second stage.

Abstract: In accordance with at least one aspect of this disclosure, embodiments of fluid pumps, pump cases, valve bodies, and volutes are disclosed herein. Embodiments of methods for manufacturing fluid pumps, pump cases, valve bodies, and volutes are also disclosed herein. Embodiments can include additive manufacturing, for example. Certain embodiments can include additively manufacturing a pump case in a tilted orientation, utilizing only coincidental support structure having a unique shape, and with teardrop shaped volute and/or valve body.

Abstract: A method can include receiving, at a control module, first pump characteristic data from a data source associated with a pump, sensing second pump characteristic data from a flow system using one or more sensors, comparing the first pump characteristic data to the second pump characteristic data sensed in the flow system, and determining a health of the pump based on the comparison of the first pump characteristic data to the second pump characteristic data.

Abstract: A baffle is provided herein. The baffle includes a cylindrical baffle section. The cylindrical baffle section includes one or more holes. The baffle also includes a split line retaining section. The split line retaining section includes one or more mounting bosses. Each of the one or more mounting bosses receives one or more mounting bolts.

Abstract: An exhaust baffle component for an aircraft starter includes a plurality of frames arranged with one another as a single component. At least one of the plurality of frames may include an attachment flange extending therefrom and defining a receiving aperture. Each frame of the plurality of frames may include one or more louvers stacked relative to one another and spaced from one another to define an air opening therebetween. The attachment flange may extend from the frame at a substantially central region of an upper portion of the frame to substantially align the receiving aperture with a starter aperture of a starter component to facilitate securement of the attachment flange to the starter component.

Abstract: A baffle is provided herein. The baffle includes a cylindrical baffle section. The cylindrical baffle section includes one or more holes. The baffle also includes a split line retaining section. The split line retaining section includes one or more mounting bosses. Each of the one or more mounting bosses receives one or more mounting bolts.

Abstract: A method can include receiving, at a control module, first pump characteristic data from a data source associated with a pump, sensing second pump characteristic data from a flow system using one or more sensors, comparing the first pump characteristic data to the second pump characteristic data sensed in the flow system, and determining a health of the pump based on the comparison of the first pump characteristic data to the second pump characteristic data.

Abstract: A fuel system for an engine including a first flow line, an electrically driven startup pump in fluid communication with the first flow line to provide a startup flow, a main flow line, a main pump in fluid communication with the main flow line to provide a main flow, and a switching valve connected to the first flow line and the main flow line, the switching valve configured to select between the first flow line and the main flow line to output either the startup flow or the main flow.

Abstract: A boost pump includes a housing cover and a pump housing engaged opposite to the housing cover. Volute passages are defined between the housing cover and the pump housing. The volute passages include a circumferentially extending volute defining a plurality of cross sections defined in a housing including the pump housing and the housing cover. The plurality of surfaces are defined as a set of dimensions set out in at least one of TABLES 1 through 3.

Abstract: A boost pump includes a boost cover and a main pump housing engaged opposite to the boost cover with an impeller rotatably engaged between the boost cover and main pump housing. The impeller includes an inducer section comprising a hub including a plurality of axial blades extended therefrom, each of the plurality of blades including a root, a tip, first and second surfaces, wherein the each of the first and second surfaces is defined in TABLE 1. The impeller includes an impeller section comprising a shroud extending from the hub including a plurality of radial blades extended therefrom. Each of the plurality of blades can include including a root, a tip, and opposed pressure and suction sides extending from the root to the tip, wherein the each of the pressure and suction sides is a surface defined in at least one of TABLES 2-4.

Abstract: A fuel supply system for a gas turbine engine has a fuel tank, a main fuel pump for receiving fuel from the fuel tank, and an electric pump also for receiving fuel from the fuel tank. The main fuel pump and the electric pump both deliver fuel to a sharing valve. The sharing valve selectively delivers fuel downstream into a gas generator portion of the gas turbine engine and to an augmentor. A control is programmed to control the sharing valve, such that fuel flows from the main fuel pump to the augmentor, and to the gas generator at higher demand operation, and does not flow from the main fuel pump at lower demand operation. A gas turbine engine and a method are also disclosed.

Abstract: An impeller spinner for a fuel pump can include a head and a shank. The head can have a base at one end and a tip at an opposite end. The shank can have a body portion nearest the head with a first diameter and a fastener portion adjacent to the body portion at an end opposite the head with a second diameter.

Abstract: A boost pump includes a boost cover and a main pump housing engaged opposite to the boost cover with an impeller rotatably engaged between the boost cover and main pump housing. The impeller includes an inducer section comprising a hub including a plurality of axial blades extended therefrom, each of the plurality of blades including a root, a tip, first and second surfaces, wherein the each of the first and second surfaces is defined in TABLE 1. The impeller includes an impeller section comprising a shroud extending from the hub including a plurality of radial blades extended therefrom. Each of the plurality of blades can include including a root, a tip, and opposed pressure and suction sides extending from the root to the tip, wherein the each of the pressure and suction sides is a surface defined in at least one of TABLES 2-4.

Abstract: A boost pump includes a housing cover and a pump housing engaged opposite to the housing cover. Volute passages are defined between the housing cover and the pump housing. The volute passages include a circumferentially extending volute defining a plurality of cross sections defined in a housing including the pump housing and the housing cover. The plurality of surfaces are defined as a set of dimensions set out in at least one of TABLES 1 through 3.

Abstract: An impeller spinner for a fuel pump can include a head and a shank. The head can have a base at one end and a tip at an opposite end. The shank can have a body portion nearest the head with a first diameter and a fastener portion adjacent to the body portion at an end opposite the head with a second diameter.

Abstract: A impeller for a centrifugal pump has an inducer section. The inducer section has first and second pluralities of blades, each having a plurality of polygonal cross-sections defined by a plurality of vertices. The pluralities of vertices are defined by tables of vertex locations. A method of making a centrifugal pump includes forming an impeller that has an inducer section, as described above, and an impeller section. The impeller is fluidly connected downstream of the inducer section and has third, fourth, and fifth pluralities of blades, each having a plurality of polygonal cross-sectional areas defined by a plurality of vertices. The pluralities of vertices are defined by tables of vertex locations.

Abstract: A housing has walls that define a volute passage and a diffuser passage fluidly connected to the volute passage. The volute passage has a first subsection and a second subsection, each having cross-sectional areas defined by tabular data. A centrifugal pump has a rotor and a housing, the housing having walls defining a volute passage and a diffuser passage fluidly connected to the volute passage. The volute passage has a first subsection and a second subsection, each having cross-sectional areas defined by tabular data.

Abstract: A impeller for a centrifugal pump has an inducer section. The inducer section has first and second pluralities of blades, each having a plurality of polygonal cross-sections defined by a plurality of vertices. The pluralities of vertices are defined by tables of vertex locations. A method of making a centrifugal pump includes forming an impeller that has an inducer section, as described above, and an impeller section. The impeller is fluidly connected downstream of the inducer section and has third, fourth, and fifth pluralities of blades, each having a plurality of polygonal cross-sectional areas defined by a plurality of vertices. The pluralities of vertices are defined by tables of vertex locations.