Patent ID: 7264445

Claim:
A cooled blade or vane for a gas turbine, having an installed radial direction and an installed axial direction, which blade or vane has a main blade or vane part, which starts from a blade or vane root and a blade or vane shank and extends in the radial direction, and the main blade or vane part having a leading edge and a trailing edge, as well as, within the main blade or vane part, a plurality of cooling ducts which extend in the radial direction, are connected in series in terms of flow and of which a first cooling duct is arranged along the leading edge and a second cooling duct is arranged along the trailing edge, which first and second cooling ducts have a direction of through-flow for a main stream of a cooling medium which extends in the installed radial direction starting from the blade or vane root, a downstream end of the first cooling duct being in fluid communication, via a first diverting region, a third cooling duct arranged between the first and second cooling ducts, and a second diverting region, with an inflow-side end of the second cooling duct, and first means being provided, through which an additional stream of cooling medium is added from the outside to the heated main stream of the cooling medium flowing from the third cooling duct into the second cooling duct, wherein the first means comprise bores which are in communication with the second diverting region, wherein a core opening oriented in the installed radial direction is arranged in the blade or vane root, and wherein the bores run through the blade or vane shank and open out into the core opening.