Turbine airfoil ceramic core with strain relief slot
AssigneeFlorida Turbine Technologies, Inc.
InventorGeorge Liang
Life of this patent
Estimating the term…
Abstract
A ceramic core used for cast an air cooled turbine rotor blade or stator vane for a gas turbine engine, the ceramic core includes a larger ceramic core piece connected to a smaller ceramic core piece with a number of even smaller cross-over hole forming pieces connecting the larger piece to the smaller piece, and a strain relief slot formed in the larger ceramic core piece adjacent to the cross-over hole forming pieces that prevent the smaller cross-over hole pieces from breaking during the casting process from relative movement of the larger ceramic core piece with respect to the smaller ceramic core piece. The strain relief slot can be used to cast a rotor blade or a stator vane.
Claims12
A ceramic core for use in casting a high temperature air cooled turbine airfoil, the ceramic core comprising:
- a cooling air supply channel forming ceramic core piece;
- an impingement pocket ceramic core forming piece;
- the cooling air supply channel forming ceramic core piece being larger than the impingement pocket ceramic core forming piece;
- a cross-over hole forming ceramic core connecting the cooling air supply channel forming ceramic core piece to the impingement pocket ceramic core forming piece;
- the cross-over hole forming ceramic core being smaller than the impingement pocket ceramic core forming piece;
- and,
- a strain relief slot formed in the cooling air supply channel forming ceramic core piece overlapping with the cross-over hole forming ceramic core in a direction perpendicular to a longitudinal direction of the ceramic core.
A ceramic core for use in casting a high temperature air cooled turbine rotor blade, the ceramic core comprising:
- a blade root cooling air supply channel forming piece;
- a blade airfoil cooling air supply channel forming piece connected to the blade root cooling air supply channel forming piece to form a continuous cooling air supply channel forming piece;
- a cross over hole forming piece located in a lower section of the blade airfoil cooling air supply channel forming piece;
- and,
- a strain relief slot extending into the blade airfoil cooling air supply channel forming piece and overlapping with the cross over hole forming piece in a direction perpendicular to a longitudinal direction of the ceramic core.
A ceramic core for use in casting a high temperature air cooled turbine stator vane, the ceramic core comprising:
- a cooling air supply channel forming piece extending from an outer diameter endwall forming piece;
- a leading edge region impingement cavity forming piece located in an upper span of the ceramic core near to the outer diameter endwall forming piece;
- a cross-over hole forming piece connecting the impingement cavity forming piece to the cooling air supply channel forming piece;
- and,
- a strain relief cut extending into the cooling air supply channel forming piece and overlapping with the cross-over hole forming piece in a direction perpendicular to a longitudinal direction of the ceramic core.
A ceramic core for use in casting a high temperature air cooled turbine airfoil, the ceramic core comprising:
- a cooling air supply channel forming piece having a progressively decreasing cross sectional flow area;
- an impingement cooling cavity forming piece located adjacent to the cooling air supply channel forming piece;
- a row of cross-over hole forming pieces connecting the cooling air supply channel forming piece to the impingement cooling cavity forming piece;
- and,
- a strain relief slot in the cooling air supply channel forming piece into a narrower section of the cooling air supply channel forming piece and overlapping with the cross-over hole forming piece in a direction perpendicular to a longitudinal direction of the ceramic core.
Dependencies are inferred from the claim text.