초록 ▼

A hollow cooled turbine airfoil is provided having pressure and suction side walls and a plurality of trailing edge cooling passages that feed cooling air bleed slots at the trailing edge. The suction side wall has a selectively reduced thickness, which allows shortened trailing edge slots, improvin

A hollow cooled turbine airfoil is provided having pressure and suction side walls and a plurality of trailing edge cooling passages that feed cooling air bleed slots at the trailing edge. The suction side wall has a selectively reduced thickness, which allows shortened trailing edge slots, improving trailing edge cooling.

대표청구항 ▼

A hollow cooled turbine airfoil is provided having pressure and suction side walls and a plurality of trailing edge cooling passages that feed cooling air bleed slots at the trailing edge. The suction side wall has a selectively reduced thickness, which allows shortened trailing edge slots, improvin

A hollow cooled turbine airfoil is provided having pressure and suction side walls and a plurality of trailing edge cooling passages that feed cooling air bleed slots at the trailing edge. The suction side wall has a selectively reduced thickness, which allows shortened trailing edge slots, improving trailing edge cooling. cave inner surface (36) in an area circumferentially surrounding the blower wheel (8) which concave inner surface (36) is formed such that the medium, exiting radially from the blower wheel (8), is guided by the concave inner surface (36) in a direction toward the constricted flow gap (30) in a flow-enhancing way. 10. The radial blower according to claim 1, wherein the blower wheel (8) has radial vanes (14) having radially inner ends forming an intake area (16) of the blower wheel (8) and being positioned on a circle having a diameter that is at least identical to or greater than a diameter of the intake opening (4). 11. The radial blower according to claim 1, wherein the housing (2) has a circumferential wall (44), a radial end face wall (46) opposite the intake opening (4), and an inner concavely curved housing surface (42) forming a transition between the circumferential wall (44) and the radial end face wall (46), wherein the at least one of a radial outlet opening and a substantially tangential outlet opening (6) adjoins directly the inner concavely curved housing surface (42). 12. The radial blower according to claim 1, wherein the radial blower has a blower working point located in an area of the blower characteristic line where for the rated volume flow a relatively small volume flow and a relatively high pressure are present. 13. The radial blower according to claim 12, wherein the rated volume flow and a free-blowing volume flow have a ratio of approximately 1:12 to 1:6, corresponding approximately to 8 to 16%. 14. A radial blower (1) comprising: a blower housing (2) having a central, axial intake opening (4) and at least one of a radial outlet opening and a substantially tangential outlet opening (6); a radial blower wheel (8) having a central intake area (16) and being arranged within the blower housing (2) such that the central intake area (16) is arranged adjacent to the intake opening (4); an intake spiral (18) having a spiral channel (20) connected to the blower housing (2) on an exterior housing side having arranged therein the intake opening (4) so that the intake spiral (18) is positioned upstream of the intake opening (4) and a medium flows radially or approximately tangentially (22) into the spiral channel (20) of the intake spiral (18) and from the spiral channel (20) axially into the intake opening (4); wherein the spiral channel (20) is delimited by a spirally shaped channel wall (38) which ends in the vicinity of the intake opening (4) such that any imaginary tangent (40) placed on the channel wall (38) is positioned outside of the intake opening (4) and the intake area (16) of the blower wheel(S) or is at most positioned tangentially thereto. 15. The radial blower according to claim 14, wherein the radial blower wheel (6) is arranged axially between the intake opening (4) and the outlet opening (6) of the blower housing (2), wherein the radial blower wheel (8) comprises a first cover disk (10) arranged at an axial side of the radial blower wheel (8) facing the outlet opening (6), and wherein the first cover disk (10) has such a diameter (D1) that a constricted annular flow gap (30) for the medium, flowing through the radial blower wheel (8) from the intake opening (4) in the direction toward the at least one of a radial outlet opening and a substantially tangential outlet opening (6), is formed between an outer circumference (26) of the first cover disk (10) and an inner circumferential surface (28) of the blower housing (2). 16. The radial blower according to claim 15, wherein the flow gap (30) has an annular flow cross-section (AR) which has a range of smaller than up to maximally 60% greater than the flow cross-section (AA) of the at least one of a radial outlet opening and a substantially tangential outlet opening (6). 17. The radial blower according to claim 15, wherein the blower wheel (8) has a second cover disk (12) facing the intake opening (4) and wherein the se