| CPC F01D 5/187 (2013.01) [F05D 2240/303 (2013.01); F05D 2240/304 (2013.01); F05D 2240/305 (2013.01); F05D 2240/306 (2013.01)] | 19 Claims |
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1. An airfoil comprising:
a suction side and a pressure side that are each provided with a cooling hole;
at least one main cavity which is formed in an inner space formed by the suction side and the pressure side and into which a cooling fluid is introduced;
an inner cooling flow path formed inside a wall body forming the pressure side and the suction side, the inner cooling flow path comprising a plurality of collision jet holes;
the collision jet holes being configured to impinge the cooling fluid against a first inner wall surface of the inner cooling flow path and to direct the cooling fluid along the inner cooling flow path toward a cooling flow path outlet formed on an end portion of the inner cooling flow path, thereby providing both impingement and convective cooling; and
a sub-cavity formed such that the sub-cavity protrudes into the inner space from inner surfaces of the suction side and the pressure side and surrounds the inner cooling flow path outlet, the sub-cavity being configured such that the inner cooling flow path outlet and a cooling hole inlet are in communication with each other.
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