Impingement cooled rotating seal

1. A rotating seal rotatable about a rotational axis and comprising:

a body having a first surface disposable to face the rotational axis and a second surface disposable to contact with a stationary element,

the body defining a cooling channel comprising:

one or more entrance channels respectively extending from the first surface;

one or more exit channels; and

a plenum extending circumferentially through the body and having a hot side adjacent to the second surface,

the plenum being fluidly interposed between the one or more entrance channels and the one or more exit channels whereby fluid exiting the one or more entrance channels and entering the plenum impinges against the hot side and subsequently exits the plenum by moving away from the hot side and the second surface through the exit channels,

wherein the one or more entrance channels are oriented along a radial dimension relative to the rotational axis with angling toward the hot side and the second surface and the one or more exit channels are angled relative to the radial dimension and are directed reversely with respect to a component of the angling of the one or more entrance channels.

2. The rotating seal according to claim 1 , wherein the first surface comprises an axial surface disposable to face radially inwardly toward the rotational axis and the second surface is disposable to face axially toward the stationary element.

3. The rotating seal according to claim 1 , wherein the one or more entrance channels and the one or more exit channels have circular cross-sections.

4. The rotating seal according to claim 1 , wherein the plenum has a racetrack-shaped cross-section and a larger cross-sectional area than the one or more entrance channels and the one or more exit channels.

5. The rotating seal according to claim 1 , wherein the plenum comprises a protrusion surface portion that protrudes toward the one or more entrance channels.

6. The rotating seal according to claim 1 , wherein the one or more entrance channels have flared outlets.

7. A rotating seal rotatable about a rotational axis and comprising:

a body having a first surface disposable to face the rotational axis and a second surface disposable to contact with a stationary element,

the body defining a cooling channel comprising:

one or more entrance channels respectively extending from the first surface;

one or more exit channels; and

a plenum extending circumferentially through the body and having a hot side adjacent to the second surface,

the plenum being fluidly interposed between the one or more entrance channels and the one or more exit channels whereby fluid exiting the one or more entrance channels and entering the plenum impinges against the hot side and subsequently exits the plenum by moving away from the hot side and the second surface through the exit channels,

wherein the one or more entrance channels are angled at about ˜30-60 degrees from the rotational axis toward the hot side and the second surface.

8. A turbine section of a gas turbine engine having an engine centerline, the turbine section comprising:

stationary and rotating seals, which are stationary and rotatable relative to the engine centerline, respectively, the rotating seal comprising:

a body having a first surface disposable to face the engine centerline and a second surface disposable to contact with the stationary element,

the body defining a cooling channel comprising:

one or more entrance channels respectively extending from the first surface;

one or more exit channels; and

a plenum extending circumferentially through the body and having a hot side adjacent to the second surface,

the plenum being fluidly interposed between the one or more entrance channels and the one or more exit channels whereby fluid exiting the one or more entrance channels and entering the plenum flows along outer surfaces of the one or more entrance channels and impinges against the hot side and subsequently exits the plenum by moving away from the hot side and the second surface through the exit channels,

wherein the one or more entrance channels are oriented along a radial dimension relative to the engine centerline with angling toward the hot side and the second surface and the one or more exit channels are angled relative to the radial dimension and are directed reversely with respect to a component of the angling of the one or more entrance channels.

9. The turbine section according to claim 8 , wherein:

the stationary and rotating seals face in the forward and aft directions, respectively, or the stationary and rotating seals face in the aft and forward directions, respectively, and

the first surface comprises an axial surface disposable to face radially inwardly toward the engine centerline and the second surface is disposable to face axially toward the stationary element.

10. The turbine section according to claim 8 , wherein the one or more entrance channels and the one or more exit channels have circular cross-sections.

11. The turbine section according to claim 8 , wherein the one or more entrance channels are angled at about ˜30-60 degrees from the engine centerline toward the hot side and the second surface.

12. The turbine section according to claim 8 , wherein the plenum has a racetrack-shaped cross-section and a larger cross-sectional area than the one or more entrance channels and the one or more exit channels.

13. The turbine section according to claim 8 , wherein the plenum comprises a protrusion surface portion that protrudes toward the one or more entrance channels.

14. The turbine section according to claim 8 , wherein the one or more entrance channels have flared outlets.