Patent ID: 8770920

Claim:
A turbine blade or vane comprising: at least one internal radial channel for the circulation of cooling medium bordered on a pressure side by a pressure side wall and on a suction side by a suction side wall joined at a upstream side at a leading edge and at and downstream side at the trailing edge; at least one exit hole through at least one of the pressure side wall or the suction side wall for blowing out of cooling medium from the internal radial channel to a medium surrounding the blade or vane; at least one trailing edge exit hole along the trailing edge and having a surfacial exit opening disposed at the pressure side of the trailing edge; and at least one radial leading-edge cooling passage disposed in proximity to the leading edge, at least one intermediate cooling passage and at least one trailing edge cooling passage disposed in proximity to the trailing edge, the trailing edge exit hole being supplied by the trailing edge cooling passage; wherein at the trailing edge, the pressure side wall of the blade or vane includes a step recessed towards the suction side, the at least one trailing edge exit hole being at least partly open towards the surrounding medium in a reqion of the step, and wherein the trailing edge exit hole is supplied by cooling medium via a bore which only partly opens in a radially extending leading-edge surface of the step and which at least partly channels through the bottom surface of the step forming scarfed holes.