Turbine blade with near-wall multi-metering and diffusion cooling circuit
First Claim
1. A turbine airfoil comprising:
- an airfoil main structure having the general shape of the airfoil and forming a leading edge and a trailing edge, and a pressure side and a suction side of the airfoil structure, the airfoil main structure forming a cooling air supply cavity;
a plurality of impingement cells formed on the airfoil main structure on the pressure side and the suction side;
an impingement hole connecting the cooling air supply cavity to the impingement cell;
a film cooling hole connecting the impingement cell to an outer surface of the airfoil;
a thin outer wall secured over the airfoil main structure, the thin outer wall enclosing the impingement cell and forming part of the film cooling hole; and
,the rows of impingement cells are staggered in which an impingement cell in a first row is positioned between adjacent impingement cells in an adjacent second row.
4 Assignments
0 Petitions
Accused Products
Abstract
A turbine airfoil with a near wall cooling design that reduces the airfoil main body metal temperature and reduces the cooling flow requirement for increased turbine efficiency. The airfoil includes a main body portion with internal cooling air supply cavities separated by one or more ribs, and a plurality of impingement cells formed on the outer surface on the pressure side and suction side of the airfoil main body. The impingement cells with film cooling holes are formed by placing a filler material within the cells and partially formed film cooling holes extending from the side wall of the cell. A thin outer airfoil wall is formed over the main body with the filler material filled cells. The filler material is leached out from the airfoil, leaving the impingement cells with the film cooling hole extending out from the side and covered by the thin outer airfoil wall. The airfoil is thus formed with a thin outer wall and the film cooling holes are formed within the outer wall without machining. The film cooling holes can be formed as straight holes, diffusion holes, or metering and diffusions holes. Also, the metering and diffusion hole connecting the cooling supply cavity to the impingement cell can be varied throughout the airfoil to regulate the pressure and cooling flow over the airfoil to control the metal temperature thereof.
-
Citations
23 Claims
-
1. A turbine airfoil comprising:
-
an airfoil main structure having the general shape of the airfoil and forming a leading edge and a trailing edge, and a pressure side and a suction side of the airfoil structure, the airfoil main structure forming a cooling air supply cavity; a plurality of impingement cells formed on the airfoil main structure on the pressure side and the suction side; an impingement hole connecting the cooling air supply cavity to the impingement cell; a film cooling hole connecting the impingement cell to an outer surface of the airfoil; a thin outer wall secured over the airfoil main structure, the thin outer wall enclosing the impingement cell and forming part of the film cooling hole; and
,the rows of impingement cells are staggered in which an impingement cell in a first row is positioned between adjacent impingement cells in an adjacent second row. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 22, 23)
-
-
16. A process of forming a turbine airfoil having an internal cooling air supply cavity and a plurality of film cooling holes, the process comprising the steps of:
-
forming an airfoil main structure with a plurality of impingement cells on the pressure side and the suction side of the airfoil; forming part of a film cooling hole on the airfoil main structure and leading from the impingement cell; drilling an impingement hole into the impingement cell connected to the cooling air supply cavity; placing a filler material in the impingement cell and the partial film cooling hole having the form of the impingement cell and the film cooling hole; forming a thin outer airfoil wall over the airfoil main structure and the impingement cell; and
,leaching out the filler material to form an open space forming the impingement cell and the film cooling hole leading out from the impingement cell. - View Dependent Claims (17, 18, 19, 20, 21)
-
Specification