Patent ID: 8500405

Claim:
An industrial engine turbine stator vane comprising: an airfoil extending between an outer diameter endwall and an inner diameter endwall; a rib extending across the airfoil from a pressure side wall to a suction side wall and dividing the airfoil into a forward section and an aft section; a forward impingement cooling insert secured within the forward section of the airfoil; an aft impingement cooling insert secured within the aft section of the airfoil; the forward impingement cooling insert forming three impingement cooling zones with a first impingement cooling zone on the pressure side wall and the second and third impingement cooling zones on the suction side wall; the first and second and third impingement cooling zones are connected in series flow; the aft impingement cooling insert forming two impingement cooling zones with a fourth impingement cooling zone on the pressure side wall and the fifth impingement cooling zone on the suction side wall; the fourth and the fifth impingement cooling zones are connected in series flow; and, both impingement cooling inserts have an alternating series of impingement cooling holes and return air openings that produce impingement cooling and channel spent impingement cooling air to the next impingement cooling zone.