Patent ID: 7914257
Filing Date: 2011-03-29
Classification: F01D

Abstract:
1. A turbine airfoil having a leading edge and a trailing edge, and a pressure side and a suction side forming the airfoil surface, the turbine airfoil comprising: a five-pass spiral serpentine flow cooling circuit comprising a first pressure side up-pass channel extending along the pressure side of the airfoil; a first suction side down-pass channel located on the suction side of the airfoil and in fluid communication with the first pressure side up-pass channel at the airfoil tip region; a second pressure side up-pass channel located on the pressure side of the airfoil and in fluid communication with the first suction side down-pass channel at the airfoil root region, where the first pressure side up-pass channel and the first suction side down-pass channel and the second pressure side up-pass channel form both a spiral and serpentine flow between them; a second suction side down-pass channel in fluid communication with the second pressure side up-pass channel at the airfoil tip region; and, a trailing edge cooling channel in fluid communication with the second suction side down-pass channel at the airfoil root region.