Cooling duct arrangement within a hollow-cast casting

1. A cooling passage arrangement inside a hollow-cast cast part, comprising:

a flow region, which is delimited by at least two spaced apart cast-part walls, for a cooling medium;

at least one line of ribs connected to the two cast-part walls and being configured to divide the flow region in a flow direction into two cooling passages; and

at least one gap arranged along the at least one line of ribs, wherein:

two rib ends face each other and are spaced from each other by the at least one gap;

one of the two rib ends has a contour in the style of a wish bone -Y-cross section and another one of the two rib ends being substantially elongate; and

the contour in the style of a wish bone -Y-cross section has an extent transversely to a longitudinal extent of the at least one line of ribs which corresponds to at least 1.5 times a width which is to be assigned to the at least one line of ribs.

2. The cooling passage arrangement as claimed in claim 1 , comprising:

a plurality of gaps arranged along the at least one line of ribs, wherein:

a plurality of pairs of upstream rib ends and downstream rib ends are each oppositely disposed at a corresponding one of the plurality of gaps, respectively; and

along the at least one line of ribs, the contour, which is formed in the style of a wish bone -Y-cross section, is provided uniformly per gap in each case on one of an upstream rib end and a downstream rib end, among the plurality of pairs of upstream rib ends and downstream rib ends.

3. The cooling passage arrangement as claimed in claim 2 , comprising:

at least two lines of ribs which extend essentially parallel to each other, wherein:

along a first one of the at least two lines of ribs, the contour, which is formed in the style of a wish bone -Y-cross section, is attached in each case uniformly on the downstream rib end per gap, and along a second one of the at least two lines of ribs, the contour, which is formed in the style of a wish bone -Y-cross section, is attached in each case uniformly on the upstream rib end per gap.

4. The cooling passage arrangement as claimed in claim 3 , wherein the contour in the style of a wish bone -Y-cross section comprises two symmetrically formed protrusions which project to the side beyond a corresponding line of ribs in each case and have a round external contour which is favorable to flow.

5. The cooling passage arrangement as claimed in claim 4 , comprising:

connecting lands of a peg-link design in a region of the cooling passages, the connecting lands being locally connected to the two cast-part walls.

6. The cooling passage arrangement as claimed in claim 4 , wherein the cast part constitutes a stator blade or rotor blade of a rotating turbomachine.

7. The cooling passage arrangement as claimed in claim 2 , comprising:

at least two lines of ribs which extend essentially parallel to each other,

wherein the gaps along the at least two lines of ribs do not overlap transversely to a path of the at least two lines of ribs.

8. The cooling passage arrangement as claimed in claim 2 , wherein the contour in the style of a wish bone -Y-cross section comprises two symmetrically formed protrusions which project to the side beyond a corresponding line of ribs in each case and have a round external contour which is favorable to flow.

9. The cooling passage arrangement as claimed in claim 8 , comprising:

connecting lands of a peg-link design in a region of the cooling passages, the connecting lands being locally connected to the two cast-part walls.

10. The cooling passage arrangement as claimed in claim 8 , wherein the cast part constitutes a stator blade or rotor blade of a rotating turbomachine.

11. The cooling passage arrangement as claimed in claim 1 , wherein the contour in the style of a wish bone -Y-cross section comprises two symmetrically formed protrusions which project to the side beyond a corresponding line of ribs in each case and have a round external contour which is favorable to flow.

12. The cooling passage arrangement as claimed in claim 11 , wherein the contour in the style of a wish bone -Y-cross section comprises two symmetrically formed protrusions which project to the side beyond a corresponding line of ribs in each case and have a round external contour which is favorable to flow.

13. The cooling passage arrangement as claimed in claim 12 , comprising:

connecting lands of a peg-link design in a region of the cooling passages, the connecting lands being locally connected to the two cast-part walls.

14. The cooling passage arrangement as claimed in claim 12 , wherein the cast part constitutes a stator blade or rotor blade of a rotating turbomachine.

15. The cooling passage arrangement as claimed in claim 14 , wherein the flow region which is provided for a cooling medium is arranged inside the stator blade or rotor blade directly upstream to a trailing edge of the stator blade or rotor blade.

16. The cooling passage arrangement as claimed in claim 1 , comprising:

connecting lands of a peg-link design in a region of the cooling passages, the connecting lands being locally connected to the two cast-part walls.

17. The cooling passage arrangement as claimed in claim 1 , wherein the cast part constitutes a stator blade or rotor blade of a rotating turbomachine.

18. The cooling passage arrangement as claimed in claim 17 , wherein the flow region is arranged inside the stator blade or rotor blade directly upstream to a trailing edge of the stator blade or rotor blade.

19. The cooling passage arrangement as claimed in claim 18 , wherein the cooling medium includes cooling air.

20. The cooling passage arrangement as claimed in claim 17 , wherein the rotating turbomachine includes a gas turbine.