Apparatus and method for operating a gas turbine engine during windmilling
A gas turbine engine according to an exemplary aspect of the present disclosure includes a windmill pump driven by a spool. A first pump driven by said spool with an air-oil cooler is located downstream of the first pump. A second pump is also driven the spool with an air-air precooler located downstream of the second pump. A method of operating a gas turbine engine during a “windmilling” condition includes driving a windmill pump with a spool during a “windmilling ” condition. A lubricant is communicated to a geared architecture with the windmill pump. A first pump is driven by the spool and an air-oil cooler is located downstream of the first pump.
1. A gas turbine engine comprising:
a spool;
a windmill pump driven by said spool through a constant speed transmission;
a first pump driven by said spool;
an air-oil cooler downstream of said first pump;
a second pump driven by said spool; and
an air-air precooler downstream of said second pump.
2. The gas turbine engine as recited in claim 1 , wherein said constant speed transmission is driven by a towershaft geared to said spool.
3. The gas turbine engine as recited in claim 1 , wherein said spool operates at speed excursions of up to 80% between a first condition and a second condition.
4. The gas turbine engine as recited in claim 3 , wherein said first condition is an idle condition and said second condition is a takeoff condition.
5. The gas turbine engine as recited in claim 1 , wherein said spool is a low spool.
6. The gas turbine engine as recited in claim 1 , wherein said spool drives a fan through a geared architecture.
7. The gas turbine engine as recited in claim 1 , wherein said first pump is an axial pump.
8. The gas turbine engine as recited in claim 1 , wherein said second pump is a centrifugal pump.
9. The gas turbine engine as recited in claim 1 , wherein said air-air precooler is downstream of said air-oil cooler.
10. The gas turbine engine as recited in claim 1 , wherein said windmill pump communicates a lubricant to a geared architecture.
11. The gas turbine engine as recited in claim 1 , wherein said spool is a low spool.
12. The gas turbine engine as recited in claim 1 , wherein said spool drives a fan through a geared architecture.
13. A method of gas turbine engine operations during a “windmilling” condition comprising:
driving a windmill pump with a spool during a “windmilling” condition;
communicating a lubricant to a geared architecture with the windmill pump;
driving a first pump by the spool with an air-oil cooler downstream of the first pump; and
driving the windmill pump through a constant speed transmission.
14. The method as recited in claim 13 , further comprising:
driving the constant speed transmission with a towershaft geared to said spool.
15. The method as recited in claim 13 , further comprising:
driving a second pump by the spool, an air-air precooler downstream of the second pump.
16. The method as recited in claim 13 , further comprising driving a fan with the spool through the geared architecture.