Generator with jet pump having motive fluid for fluidly coupling to a cooling circuit

1. A generator comprising:

a housing defining an interior and fluidly separating the interior from surrounding ambient air;

at least one of a rotor or stator located within the housing;

a cooling circuit passing through at least a portion of the housing to cool the interior and recirculating a coolant having a density greater than the ambient air;

a jet pump having a motive fluid conduit fluidly coupled to the cooling circuit, a transport fluid circuit fluidly coupled to the ambient air, and a mixing chamber fluidly connecting the motive fluid conduit and the transport fluid circuit to form a mixed flow within the mixing chamber, with the mixing chamber having a chamber outlet to the interior; and

an air shut-off valve fluidly coupled to the transport fluid circuit located downstream of the inlet and upstream of the jet pump.

2. The generator of claim 1 wherein the jet pump comprises a nozzle fluidly connecting the transport fluid circuit to the mixing chamber.

3. The generator of claim 2 wherein the nozzle is a converging nozzle.

4. The generator of claim 2 wherein the jet pump further comprises a swirl inducer located in fluid flow line with the motive fluid conduit and upstream of the nozzle.

5. The generator of claim 1 wherein the jet pump further comprises a diffuser located at the chamber outlet.

6. The generator of claim 5 wherein the diffuser is a diverging nozzle.

7. The generator of claim 5 wherein the diffuser is a baffle.

8. The generator of claim 1 wherein the jet pump further comprises a swirl inducer located in fluid flow line with the motive fluid conduit.

9. The generator of claim 1 wherein the jet pump further comprises a filter located in fluid flow line with the motive fluid conduit.

10. The generator of claim 1 wherein the air shut-off valve fluidly connects the transport fluid circuit to the ambient air.

11. The generator of claim 10 wherein the air shut-off valve further comprises a first check valve movable between an opened position and a closed position, where the opened position occurs when an interior pressure is less than a predetermined pressure.

12. The generator of claim 1 wherein the ambient air has a pressure equivalent to atmospheric pressure at an altitude between 9,000 m (30,000 ft) and 22,000 m (70,000 ft).

13. An air pressurization system comprising:

a housing defining an interior, including a sump for collecting a motive fluid, and fluidly separating the interior from an exterior of surrounding ambient air;

a transport fluid circuit for transporting an ambient airflow extending between an inlet fluidly coupled to the exterior and an outlet fluidly coupled to the interior;

a cooling circuit fluidly coupled to the housing at the sump for recirculating the motive fluid;

a jet pump fluidly coupling the transport fluid circuit and the cooling circuit and comprising a mixing chamber for mixing the motive fluid and the ambient air to produce a pressurized mixture of air and motive fluid that is released into the interior via the outlet; and

an air shut-off valve fluidly coupled to the transport fluid circuit located downstream of the inlet and upstream of the jet pump.

14. The air pressurization system of claim 13 wherein the jet pump further includes a first jet inlet fluidly coupled with the transport fluid circuit and a second jet inlet fluidly coupled with the cooling circuit.

15. The air pressurization system of claim 14 wherein the first and second jet inlets are fluidly coupled to the mixing chamber at a chamber inlet.

16. The air pressurization system of claim 15 wherein the mixing chamber extends between the chamber inlet and a chamber outlet fluidly coupled with the interior.

17. The air pressurization system of claim 15 further comprising a swirl inducer upstream from the chamber inlet in line with the cooling circuit.

18. The air pressurization system of claim 17 further comprising a filter upstream from the swirl inducer in line with the cooling circuit.

19. The air pressurization system of claim 18 wherein the chamber inlet comprises a first nozzle.

20. The air pressurization system of claim 19 further comprising an interior nozzle in line with the cooling circuit.

21. The air pressurization system of claim 20 where at least one of the first nozzle or the interior nozzle is a converging nozzle.

22. The air pressurization system of claim 21 further comprising a diffuser at the chamber outlet.

23. The air pressurization system of claim 22 wherein the diffuser is at least one of a diverging nozzle or a baffle.

24. The air pressurization system of claim 13 wherein the air shut-off valve further comprises a first check valve movable between an opened position and a closed position, where the opened position occurs when an interior pressure has dropped below a predetermined pressure.

25. A method of maintaining a predetermined pressure within a housing defining an interior and fluidly separating the interior from an ambient air, the method comprising:

receiving an ambient airflow within a jet pump mixing chamber;

receiving a motive fluid flow having a higher density than the ambient airflow within the jet pump mixing chamber;

mixing the ambient airflow with the motive fluid flow to transfer momentum from the motive fluid to the ambient airflow; and

discharging the ambient airflow into the interior to form a pressurized interior.

26. The method of claim 25 further comprising recirculating the motive fluid flow back through the jet pump mixing chamber.

27. The method of claim 25 further comprising discharging the ambient airflow through a diffuser.

28. The method of claim 25 further comprising swirling the motive fluid flow through a swirl inducer.

29. The method of claim 25 further comprising recirculating the motive fluid flow through a sump.