초록 ▼

An airfoil includes a body that includes leading and trailing edges joined by spaced apart pressure and suction sides to provide an exterior airfoil surface. A cooling passage is arranged interiorly of the exterior airfoil surface and provides an interior surface. The interior cooling surface includ

An airfoil includes a body that includes leading and trailing edges joined by spaced apart pressure and suction sides to provide an exterior airfoil surface. A cooling passage is arranged interiorly of the exterior airfoil surface and provides an interior surface. The interior cooling surface includes micro-bumps that protrude from the interior cooling surface into the cooling passage. The micro-bumps are discrete from and noncontiguous relative to one another in multiple directions along the interior cooling surface. The micro-bumps may be provided while forming the airfoil or using correspondingly shaped micro-depressions on an airfoil core.

대표청구항 ▼

1. A method of manufacturing an airfoil comprising the steps of: depositing multiple layers of powdered metal onto one another;joining the layers to one another with reference to CAD data relating to a particular cross-section of an airfoil; andproducing the airfoil with leading and trailing edges j

1. A method of manufacturing an airfoil comprising the steps of: depositing multiple layers of powdered metal onto one another;joining the layers to one another with reference to CAD data relating to a particular cross-section of an airfoil; andproducing the airfoil with leading and trailing edges joined by spaced apart pressure and suction sides to provide an exterior airfoil surface, a cooling passage arranged interiorly of the exterior airfoil surface and providing an interior surface, the interior cooling surface including micro-bumps protruding from the interior cooling surface into the cooling passage, the micro-bumps discrete from and noncontiguous relative to one another in multiple directions along the interior cooling surface, wherein the micro-bumps are noncontiguous from one another 360° about each micro-bump along the interior cooling surface. 2. The method according to claim 1, comprising the step processing the airfoil to provide desired structural characteristics. 3. The method according to claim 2, wherein the processing step includes heating the airfoil to reconfigure the joined layers into at least one of a equi-axed structure, directionally solidified structure and single crystalline structure. 4. The method according to claim 1, wherein at least one of the micro-bumps includes a spherical cap. 5. The method according to claim 1, wherein at least one of the micro-bumps is teardrop shaped. 6. The method according to claim 1, wherein the cooling passage is provided by opposing cooling surfaces, each of the opposing cooling surfaces including first and second micro-bumps that are offset relative to one another. 7. The method according to claim 1, wherein the interior cooling surface and the micro-bumps include a uniform microstructure relative to one another. 8. The method according to claim 1, wherein at least one of the micro-bumps include secondary micro-bumps on the at least one of the micro-bumps. 9. A method of manufacturing an airfoil comprising the steps of: depositing multiple layers of powdered metal onto one another;joining the layers to one another with reference to CAD data relating to a particular cross-section of an airfoil; andproducing the airfoil with leading and trailing edges joined by spaced apart pressure and suction sides to provide an exterior airfoil surface, a cooling passage arranged interiorly of the exterior airfoil surface and providing an interior surface, the interior cooling surface including micro-bumps protruding from the interior cooling surface into the cooling passage, the micro-bumps discrete from and noncontiguous relative to one another in multiple directions along the interior cooling surface, wherein the interior cooling surface includes first and second micro-bumps adjacent to one another and separated by a length in a stream-wise direction, wherein the length is about 1 to 10 times a micro-bump length, and the first and second micro-bumps are separated in a span-wise direction perpendicular to the stream-wise direction a width, wherein the width is about 0.5 to 5 times a micro-bump width. 10. The method according to claim 9, wherein the micro-bump length and micro-bump width are the same and correspond to a radius providing a circular base to the micro-bump on the interior cooling surface. 11. A method of manufacturing an airfoil comprising the steps of: depositing multiple layers of powdered metal onto one another;joining the layers to one another with reference to CAD data relating to a particular cross-section of an airfoil; andproducing the airfoil with leading and trailing edges joined by spaced apart pressure and suction sides to provide an exterior airfoil surface, a cooling passage arranged interiorly of the exterior airfoil surface and providing an interior surface, the interior cooling surface including micro-bumps protruding from the interior cooling surface into the cooling passage, the micro-bumps discrete from and noncontiguous relative to one another in multiple directions along the interior cooling surface, wherein the micro-bumps include a height configured to be 10% to 200% of a flow boundary layer thickness along the interior cooling surface.