초록 ▼

A thermally highly loaded machine component (10), which is protected from overheating by film cooling, is provided with conical cooling passages (30) of circular cross section. The cooling passages are designed so as to be divergent from the cold-gas side (13) toward the hot-gas side. The conical co

A thermally highly loaded machine component (10), which is protected from overheating by film cooling, is provided with conical cooling passages (30) of circular cross section. The cooling passages are designed so as to be divergent from the cold-gas side (13) toward the hot-gas side. The conical cooling passages, as compared with cylindrical passages with regard to the mass flow of cooling medium (35) fed through the cooling passages, are substantially less dependent on the pressure ratio between the cold-gas side (13) and hot-gas side (14) of the component. The straight conical cooling passages of round cross section throughout may be produced in a very simple manner by laser drilling, with a convergent cutting beam being used for the machining.

대표청구항 ▼

1. A component which can be subjected to high thermal loading and to which a hot-gas flow can be admitted during operation, the component comprising:at least one hot-gas side for exposure to the hot-gas flow and a cold-gas side not for exposure to the hot-gas flow; component cooling passages connect

1. A component which can be subjected to high thermal loading and to which a hot-gas flow can be admitted during operation, the component comprising:at least one hot-gas side for exposure to the hot-gas flow and a cold-gas side not for exposure to the hot-gas flow; component cooling passages connecting the hot-gas side and the cold-gas side so that when a cooling medium flows from the cold-gas side to the hot-gas side, the cooling medium, when passing through a component passage, absorbs heat from the component and draws off the heat to the hot-gas side; wherein at least one of the component cooling passages has a length, a hot-side orifice, a cold-side orifice, and a circular cross section over the entire length of the at least one component cooling passage, which cross section increases continuously from the cold-gas side to the hot-gas side, the at least one component cooling passage enclosing an opening half angle so that the at least one component cooling passage is frustoconical; wherein the opening half angle of the at least one component cooling passage is essentially constant over the length of the passage; wherein the opening half angle is between 0.2° and 2.5°; and wherein a ratio of the cross-sectional area of the hot-side orifice of the at least one component cooling passage to the cross-sectional area of the cold-side orifice of the at least one component cooling passage is less than 1.2.