Method for impingement cooling of a turbine airfoil with large platform to airfoil fillet radius, as well as corresponding system and airfoil

摘要

A method of impingement cooling a turbine airfoil (60) with a large platform (66) to airfoil fillet (74) radius which includes coring the airfoil fillet such that the fillet wall is maintained at a minimum thickness. An impingement tube (72) is used which follows the fillet contour as it transitions from airfoil (60) to platform (66) and supplies impingement air to the airfoil walls. The air subsequently flows across the airfoil internal wall and finally exits the airfoil through airfoil holes (68) to provide film cooling to the airfoil fillet (64).