Turbine engine components with near surface cooling channels and methods of making the same
A turbine component includes an airfoil-shaped core having an outer peripheral surface. A plurality of channels is formed in the core, each opening to the outer peripheral surface. The channels extend substantially radially to be elongated in the radial direction. A first platform is attached to the core. The component also includes an airfoil-shaped non-permeable skin having a hollow interior, an inner peripheral surface and an outer peripheral surface. The skin is sized so that the core can be received in the hollow interior of the skin. A second platform is attached to the skin. The core is received in the hollow interior of the skin such that the outer peripheral surface of the core engages the inner peripheral surface of the skin such that a plurality of generally radial cooling channels are formed between the channels in the core and the inner peripheral surface of the skin.
1. A method of forming a turbine component comprising the steps of:
forming an airfoil-shaped core having an outer peripheral surface;
forming a plurality of channels in the core such that each channel opens to the outer peripheral surface of the core, the plurality of channels extending radially so as to be elongated in the radial direction;
forming a non-permeable, airfoil-shaped skin having a hollow interior, the skin having an inner peripheral surface and an outer peripheral surface, the skin being sized so that the core can be received in the hollow interior of the skin;
after the step of forming the plurality of channels in the core, bringing the core and the skin together such that the core is received in the hollow interior of the skin such that the outer peripheral surface of the core engages the inner peripheral surface of the skin to thereby form a plurality of radial cooling channels between the channels in the core and the inner peripheral surface of the skin; and
attaching the skin to the core over at least a portion of the engaging surfaces of the outer peripheral surface of the core and the inner peripheral surface of the skin,
wherein the method further includes:
forming a first platform together with the core, whereby a unitary structure is formed; and
forming a second platform together with the skin, whereby a unitary structure is formed.
2. The method of claim 1 wherein the skin includes a distal end and wherein, after the step of bringing the core and the skin together, the distal end of the skin engages the first platform, and further including the step of:
attaching the distal end of the skin to the first platform.
3. The method of claim 1 , wherein the core is formed such that it includes at least one transverse channel extending in a direction that is transverse to the radially extending channels, the at least one transverse channel connects between two neighboring radially extending channels.
4. The method of claim 1 , wherein the core is made of a material that has a higher coefficient of thermal expansion than the material of the skin.
5. The method of claim 1 , including matingly engaging the outer peripheral surface of the core with the inner peripheral surface of the skin.
6. The method of claim 1 , wherein the core has an associated radial length, wherein each of the channels extends more than 50 percent of the radial length of the core.
7. The method of claim 1 , wherein the turbine component is a vane.