Air turbine starter with containment assembly
An air turbine starter that includes a housing defining an interior having a primary air flow path. A rotatable turbine member located in the interior includes a plurality of circumferentially spaced blades that extend into the primary air flow path. A containment assembly couples to the housing and circumscribes at least a portion of the plurality of circumferentially spaced blades. The containment assembly includes a hollow tube and a laminate.
1 . An air turbine starter comprising:
a housing defining an interior, wherein the housing includes a primary inlet and a primary outlet to define a primary air flow path from the primary inlet to the primary outlet;
a rotatable turbine member comprising a plurality of circumferentially spaced blades extending into the primary air flow path; and
a containment assembly located in the interior and circumscribing at least a portion of the plurality of circumferentially spaced blades, the containment assembly comprising:
a hollow tube coupled to the housing and comprising a first material, wherein the hollow tube includes an exterior surface and an interior surface spaced from the exterior surface; and
a laminate comprising a second material different from the first material, wherein the laminate is a series of axially spaced annular rings applied to a radially inner side of the exterior surface of the hollow tube.
2 . The air turbine starter of claim 1 , further comprising a plurality of recesses defined, at least in part, by the radially inner side of the exterior surface of the hollow tube, wherein each recess of the plurality of recesses is located between two annular rings of the series of axially spaced annular rings.
3 . The air turbine starter of claim 1 , wherein the series of axially spaced annular rings are secured, by electroforming, to the radially inner side of the exterior surface.
4 . The air turbine starter of claim 1 , wherein at least a portion of the laminate has a thickness measured from an outer surface to an inner surface in a range from 0.2 millimeters to 7.65 millimeters.
5 . The air turbine starter of claim 1 , wherein at least a portion of the laminate has a thickness measured from an outer surface to an inner surface in a range from 0.1% to 80% of a total radial thickness of the containment assembly.
6 . The air turbine starter of claim 1 , further comprising a third ring coupled to the exterior surface of the hollow tube or one or more of the series of axially spaced annular rings.
7 . The air turbine starter of claim 6 , wherein the third ring is additively manufactured and located at an inner surface or an outer surface of the laminate.
8 . The air turbine starter of claim 6 , wherein the third ring is additively manufactured and located at the exterior surface of the hollow tube.
9 . The air turbine starter of claim 6 , wherein the third ring comprises a third material different than the first material and the second material.
10 . The air turbine starter of claim 6 , wherein the third ring is located between two or more of the series of axially spaced annular rings.
11 . The air turbine starter of claim 6 , further comprising additional laminates or additional rings applied to one or more portions of the exterior surface of the hollow tube.
12 . The air turbine starter of claim 1 , wherein the first material comprises titanium, nickel, or a combination thereof.
13 . The air turbine starter of claim 12 , wherein the nickel is a nickel superalloy having chromium.
14 . The air turbine starter of claim 12 , wherein the second material comprises nickel, cobalt, phosphorus, or combination thereof.
15 . The air turbine starter of claim 1 , further comprising a support structure that spans at least a portion of a cavity defined by the interior surface of the hollow tube.
16 . The air turbine starter of claim 15 , wherein the support structure is a set of support structures, and wherein two or more of the support structures of the set of support structures have different thicknesses.
17 . The air turbine starter of claim 1 , further comprising a mechanical surface interlock defined by portions of the hollow tube and the laminate.
18 . The air turbine starter of claim 17 , wherein the mechanical surface interlock includes tabs extending from the exterior surface of the hollow tube received by recesses at an outer surface of the laminate, or tabs extending from the outer surface of the laminate that are received by recesses in the exterior surface of the hollow tube.
19 . The air turbine starter of claim 1 , wherein a total radial thickness of the containment assembly is measured radially along a direction extending from an axis of rotation, and wherein the total radial thickness is between 2.54 millimeters and 20.32 millimeters.
20 . The air turbine starter of claim 1 , further comprising one or more apertures that fluidly couple a cavity defined by the interior surface of the hollow tube with the interior of the air turbine starter.