Base material with cooling air hole

1. A base material with a cooling air hole, through which cooling air laded with particles flows during the operation of the cooling air hole, wherein means which prevent the particles closing the cooling air holes are present at the cooling air hole wherein the means includes a stirrup which is located above the cooling air hole, said stirrup extending continuously and having no apertures.

2. The base material as claimed in claim 1 , wherein the base material is a part of a gas turbine.

3. The base material as claimed in claim 2 , wherein the part of the gas turbine is a cast part or a sheet-metal part.

4. A base material with a cooling air hole, through which cooling air laded with particles flows during the operation of the cooling air hole, wherein means which prevent the particles closing the cooling air holes are present at the cooling air hole, wherein the means includes a wire mesh which is located above the cooling air hole.

5. The base material as claimed in claim 4 , wherein the wire mesh is arranged as a corrugation above the cooling air hole, so that it is fastened to the base material adjacent to the cooling air hole and a certain distance exists between wire mesh and cooling air hole.

6. The base material as claimed in claim 4 , wherein the base material is a part of a gas turbine.

7. The base material as claimed in claim 6 , wherein the part of the gas turbine is a cast part or a sheet-metal part.

8. A base material with a cooling air hole, through which cooling air laded with particles flows during the operation of the cooling air hole, wherein means which prevent the particles closing the cooling air holes are present at the cooling air hole, wherein the means include the edge of the cooling air hole being uneven or having a ridge with a sufficient height to prevent the particle from closing the cooling air hole, wherein the ridge has a form of a star stamped on the base material.

9. The base material as claimed in claim 8 , wherein the base material is a part of a gas turbine.

10. The base material as claimed in claim 9 , wherein the part of the gas turbine is a cast part or a sheet-metal part.

11. A base material with a cooling air hole, through which cooling air laded with particles flows during the operation of the cooling hole, wherein means which prevent the particles closing the cooling air holes are present at the cooling air hole, wherein the means includes a star-shaped cooling air hole.

12. The base material as claimed in claim 11 , wherein the base material is a part of a gas turbine.

13. The base material as claimed in claim 12 , wherein the part of the gas turbine is a cast part or a sheet-metal part.

14. A base material with a cooling air hole, through which cooling air laded with particles flows during the operation of the cooling hole, wherein means which prevent the particles closing the cooling air holes are present at the cooling air hole, wherein the means includes an ellipsoidal cooling air hole.

15. The base material as claimed in claim 14 , wherein the base material is a part of a gas turbine.

16. The base material as claimed in claim 15 , wherein the part of the gas turbine is a cast part or a sheet-metal part.

17. A base material with a cooling air hole, through which cooling air laded with particles flows during the operation of the cooling hole, wherein means which prevent the particles closing the cooling air hole are present at the cooling air hole, wherein the means includes a circular cooling air hole with lateral slots formed as a star-shaped cooling air hole, an extent of the lateral slots of the circular cooling air hole being limited so as to be separate from lateral slots of an adjacent cooling air hole.

18. The base material as claimed in claim 17 , wherein the base material is a part of a gas turbine.

19. The base material as claimed in claim 18 , wherein the part of the gas turbine is a cast part or a sheet-metal part.