摘要:
Ceramic core used for the production of a hollow turbine blade of a turbomachine by the lost-wax casting method and shaped to constitute the cavities of said blade in a single component, comprising, in order to jointly supply the interior of said cavities with cooling air, core portions (60, 62) intended to form the first and second lateral cavities connected to a core portion (48) intended to form at least one central cavity, both at the foot of the core (54) by at least two ceramic junctions (70) as well as at different heights of said core by a plurality of other ceramic junctions (64, 66, 68) the positioning of which defines the thickness of internal partitions of the blade while ensuring a complement of cooling air to the predetermined critical zones of the first and second lateral cavities.
摘要:
The invention concerns a turbine blade (91) comprising a root (P), a vane extending in a spanwise direction (EV), ending at a tip (S) and comprising a leading edge and a trailing edge and a pressure-side wall and a suction-side wall, said vane further comprising: at least one upstream duct (93) configured to collect air at the root (P) to cool the leading edge, discharging said air through holes passing through the wall of the leading edge; at least one downstream duct (96) separate from the upstream duct (93) and configured to collect air at the root (P) to cool the trailing edge, discharging said air through holes (97) passing through the pressure wall upstream from the trailing edge; an inner side cavity (101) running along the pressure-side wall to form a heat shield insulating the downstream duct (96).
摘要:
The internal cooling of the moving blades of the turbines in aircraft turbomachines is limited in effectiveness because of inhomogeneities of this cooling on each of the pressure-face and suction-face walls. To address this problem, there is proposed a blade comprising a circuit (50) for cooling the airfoil part (34) thereof, in which circuit the cavities interconnected in series are such that the stream of air flows radially toward the outside along the pressure-face wall (40) in pressure-face cavities (52, 56), and radially toward the inside along the suction-face wall (42) in a suction-face cavity (54) that is separated from the pressure-face cavities by an internal wall (58) of the airfoil part. In this way, the force of the Coriolis effect deflects the stream of air toward each of the pressure-face and suction-face walls thereby limiting the inhomogeneity.
摘要:
The invention relates to a moulding unit (210) for producing a turbomachine blade blank. The moulding unit (210) has an upstream portion (270) and a downstream portion (280). According to the invention, the moulding unit (210) comprises a raised portion (231) designed to form a downstream opening which, at the level of the trailing edge, passes through at least one of the side edges of the basin-like portion at the blade tip. The raised portion (231) rigidly secures the upstream portion (270) to the downstream portion (280) and comprises a strengthening protuberance extending in the transverse direction.
摘要:
The invention concerns a turbine blade (51) for a turbomachine such as a turboprop or a turbojet, said blade comprising a root (P), a vane carried by said root (P) and extending in a spanwise direction (EV), ending at a tip (S), said vane comprising a pressure-side wall and a suction-side wall spaced apart from each other, and: - at least one duct (53) configured to collect cooling air at the root (P) and to make same flow in the vane in order to cool same; - holes and/or slots (55, 67) made in the walls of same in order to discharge the cooling air out of the vane; - an upper inner cavity (52) located at the tip (S) of the vane in order to cool same; and wherein at least one of said ducts (53) directly supplies the upper cavity with cooling air collected in the root (P).
摘要:
The invention concerns a turbine blade (11) for a turbomachine, comprising a vane (12) extending in a spanwise direction between a root and a tip, a first inner side cavity (54) running along the pressure-side wall (21) and a second inner side cavity (56) running along the suction-side wall. The blade (11) further comprises at least one inner central duct (53) configured to collect air intended to cool the vane (12). The central duct (53) extends between the side cavities (54, 56), being separated from the side cavities (54, 56) so as to be at least partially thermally isolated from the pressure-side wall (21) and the suction-side wall. The side cavities (54, 56) communicate with each other in a junction region (72) located downstream from the central duct (53), over the majority of the height of the central duct in the spanwise direction.