Windage blocker for oil routing
A scupper suitable for a bearing compartment of a gas turbine engine includes a windage blocker in a gutter section upstream of a drain hole, the windage blocker extends from a wall of the gutter section. A method for capturing wept oil in a bearing compartment of a gas turbine engine includes positioning a windage blocker adjacent to a drain hole forming a passage space and increasing a pressure upstream of the windage blocker to generate a vortex downstream of the windage blocker creating an oil re-circulation zone promoting oil drainage into the drain hole.
1. An oil drainback system suitable for a bearing compartment of a gas turbine engine comprising:
a scupper defined about an engine longitudinal axis;
a gutter section formed in the scupper, the gutter section having a drain hole; and
a windage blocker in the gutter section upstream of and circumferentially aligned with the drain hole with respect to windage in the gutter section, the windage blocker extends from a wall of the gutter section;
wherein the windage blocker extends from the wall of the clutter section to define a passage space 25%-30% a total width of the clutter section to allow a percentage of oil pass through.
2. The system as recited in claim 1 , wherein the drain hole extends at least partially into the wall of the gutter section.
3. The system as recited in claim 1 , wherein the windage blocker is upstream of the drain hole by a distance equivalent to a width of the windage blocker.
4. The system as recited in claim 1 , wherein the gutter section is a 360 degree gutter section, and wherein the windage blocker is upstream of the drain hole by 2-5 degrees of the 360 degree gutter section.
5. The system as recited in claim 1 , wherein the windage blocker is a pin affixed within an aperture formed in the wall of the gutter section.
6. The system as recited in claim 1 , wherein the windage blocker is machined in the wall of the gutter section.
7. A bearing compartment of a gas turbine engine comprising:
a scupper defined about an engine longitudinal axis;
a gutter section formed in the scupper, the gutter section having a drain hole;
a windage blocker in the gutter section upstream of and circumferentially aligned with the drain hole with respect to windage in the gutter section, the windage blocker extends from a wall of the gutter section; and
an oil drain tube assembly in communication with the drain hole;
wherein the windage blocker extends from the wall of the clutter section to define a passage space 25%-30% a total width of the clutter section to allow a percentage of oil pass through.
8. The bearing compartment as recited in claim 7 , wherein the scupper extends aft of a rear bearing of the bearing compartment.
9. The bearing compartment as recited in claim 8 , further comprising a seal assembly within the scupper.
10. The bearing compartment as recited in claim 9 , wherein the seal assembly is aft of the rear bearing.
11. The bearing compartment as recited in claim 7 , wherein the oil drain tube assembly is located at bottom dead center of the gutter section.
12. The bearing compartment as recited in claim 2 , wherein the windage blocker is upstream of the drain hole by a distance equivalent to a width of the windage blocker.
13. The bearing compartment as recited in claim 7 , wherein the gutter section is a 360 degree gutter section, and wherein the windage blocker is upstream of the drain hole by 2-5 degrees of the 360 degree gutter section.
14. A method for capturing wept oil in a bearing compartment of a gas turbine engine comprising a scupper defined about an engine longitudinal axis; a gutter section formed in the scupper, the gutter section having a drain hole; and a windage blocker in the gutter section, the method comprising:
positioning the windage blocker adjacent to, upstream of and circumferentially aligned with the drain hole forming a passage space for increasing a pressure upstream of the windage blocker and generating a vortex downstream of the windage blocker so as to create an oil re-circulation zone promoting oil drainage into the drain hole;
wherein the windage blocker extends from the wall of the clutter section to define a passage space 25%-30% a total width of the clutter section to allow a percentage of oil pass through.
15. The method as recited in claim 14 , further comprising positioning the windage blocker to extend from a wall in a gutter section, the drain hole positioned at least partially on the wall.
16. The method as recited in claim 14 , further comprising creating both a calming area for oil to pool and build head pressure for the oil to drain down the drain hole as well as a pumping action due to the direction of rotation of the recirculation zone.
17. The method as recited in claim 14 , further comprising changing an oil concentration circumferentially around the gutter section due to the presence of the windage blocker.