Turbomachine with turbine section having integrated fluid separator

1. A turbomachine with a turbine section comprising:

a turbine wheel supported for rotation about an axis;

a turbine housing that houses the turbine wheel and that includes an inlet, a first outlet, and a second outlet, the inlet configured to receive an inlet flow that includes a first fluid and a second fluid;

the turbine housing including a first housing member, the first housing member at least partly defining a separator chamber of the turbine housing, the first housing member at least partly defining the second outlet; and

the turbine housing and the turbine wheel cooperatively defining a first flow path extending downstream from the inlet, across the turbine wheel, to the first outlet, the turbine housing defining a second flow path extending downstream from the inlet to the second outlet, the first flow path and the second flow path both extending through the separator chamber, the separator chamber configured to separate the first fluid from the second fluid allowing the first fluid to flow along the first flow path toward the first outlet and allowing the second fluid to flow along the second flow path toward the second outlet.

2. The turbomachine of claim 1 , wherein the turbine wheel includes a front face and a back face that face in opposite directions along the axis;

wherein the inlet is directed radially with respect to the axis; and

wherein the turbine housing includes a second housing member that cooperates with the first housing member to house the turbine wheel, the front face facing toward the first housing member along the axis, and the back face facing toward the second housing member.

3. The turbomachine of claim 2 , wherein the second housing member is unitary and includes a flow surface facing the back face of the turbine wheel; and

wherein the first housing member and the flow surface cooperatively define a turbine wheel upstream area of the first flow path.

4. The turbomachine of claim 3 , wherein the second housing member includes a plurality of vane members that project axially from the flow surface, the vane members disposed in the turbine wheel upstream area of the first flow path.

5. The turbomachine of claim 4 , wherein the separator chamber is defined by an inner radial wall, an outer radial wall, an axial wall, and a lip of the first housing member, the inner radial wall and the outer radial wall spaced apart radially with respect to the axis, the axial wall extending radially between the inner radial wall and the outer radial wall, the lip spaced apart axially from the axial wall with respect to the axis, the lip projecting radially from the inner radial wall; and

wherein the flow surface and the lip cooperatively define the turbine wheel upstream area of the first flow path; and

wherein the plurality of vane members are disposed axially between the flow surface and the lip.

6. The turbomachine of claim 1 , wherein the second outlet is a drain hole extending through the first housing member and fluidly connected to the separator chamber.

7. The turbomachine of claim 6 , wherein the separator chamber is defined by an inner surface of the first housing member, and wherein the first housing member includes at least one concave sink surface that is contoured and transitions between the inner surface and the drain hole.

8. The turbomachine of claim 7 , wherein the at least one concave sink surface surrounds the drain hole.

9. The turbomachine of claim 1 , wherein the turbine wheel is made from a steel material, and wherein the first housing member is made from an aluminum alloy.

10. The turbomachine of claim 1 , wherein the first housing member is unitary.

11. A method of manufacturing a turbomachine with a turbine section comprising:

supporting a turbine wheel for rotation about an axis within a turbine housing, the turbine housing including an inlet, a first outlet, and a second outlet, the inlet configured to receive an inlet flow that includes a first fluid and a second fluid, the turbine housing including a first housing member that at least partly defines a separator chamber of the turbine housing, the first housing member at least partly defining the second outlet;

defining, cooperatively with the turbine housing and the turbine wheel, a first flow path extending downstream from the inlet, across the turbine wheel, to the first outlet; and

defining, with the turbine housing, a second flow path extending downstream from the inlet to the second outlet, the first flow path and the second flow path both extending through the separator chamber, the separator chamber configured to separate the first fluid from the second fluid allowing the first fluid to flow along the first flow path toward the first outlet and allowing the second fluid to flow along the second flow path toward the second outlet.

12. The method of claim 11 , wherein the turbine wheel includes a front face and a back face that face in opposite directions along the axis;

wherein supporting the turbine wheel for rotation about the axis within the turbine housing includes:

directing the inlet radially with respect to the axis; and

housing the turbine wheel cooperatively with a second housing member of the turbine housing and the first housing member, the front face facing toward the first housing member along the axis, and the back face facing toward the second housing member.

13. The method of claim 12 , wherein the second housing member is unitary and includes a flow surface facing the back face of the turbine wheel; and

wherein the first housing member and the flow surface cooperatively define a turbine wheel upstream area of the first flow path.

14. The method of claim 13 , wherein the second housing member includes a plurality of vane members that project axially from the flow surface; and

wherein supporting the turbine wheel for rotation about the axis within the turbine housing includes disposing the vane members in the turbine wheel upstream area of the first flow path.

15. The method of claim 14 , wherein the separator chamber is defined by an inner radial wall, an outer radial wall, an axial wall, and a lip of the first housing member, the inner radial wall and the outer radial wall spaced apart radially with respect to the axis, the axial wall extending radially between the inner radial wall and the outer radial wall, the lip spaced apart axially from the axial wall with respect to the axis, the lip projecting radially from the inner radial wall; and

further comprising defining, cooperatively with the flow surface and the lip, the turbine wheel upstream area of the first flow path, wherein the plurality of vane members are disposed axially between the flow surface and the lip.

16. The method of claim 11 , wherein the second outlet is a drain hole extending through the first housing member and fluidly connected to the separator chamber.

17. The method of claim 16 , wherein the separator chamber is defined by an inner surface of the first housing member, and wherein the first housing member includes at least one concave sink surface that is contoured and transitions between the inner surface and the drain hole.

18. The method of claim 11 , further comprising forming the first housing member.

19. The method of claim 18 , wherein forming the first housing member includes forming the first housing member from an aluminum alloy; and

wherein the turbine wheel is made from a steel material.

20. A fuel cell system comprising:

a fuel cell stack; and

a turbomachine with a turbine section that is fluidly coupled to the fuel cell stack and configured to receive an exhaust stream therefrom;

the turbine section including:

a turbine wheel supported for rotation about an axis;

a turbine housing that houses the turbine wheel and that includes an inlet, a first outlet, and a second outlet, the inlet configured to receive the exhaust stream as an inlet flow that includes a first fluid and a second fluid;

the turbine housing including a first housing member that is unitary, the first housing member at least partly defining a separator chamber of the turbine housing, the first housing member at least partly defining the second outlet; and

the turbine housing and the turbine wheel cooperatively defining a first flow path extending downstream from the inlet, across the turbine wheel, to the first outlet, the turbine housing defining a second flow path extending downstream from the inlet to the second outlet, the first flow path and the second flow path both extending through the separator chamber, the separator chamber configured to separate the first fluid from the second fluid allowing the first fluid to flow along the first flow path toward the first outlet and allowing the second fluid to flow along the second flow path toward the second outlet.