Turbine blade with diverging and tandem cooling passages

Abstract

The application provides a turbine blade with bifurcated cooling pipes and tandem cooling pipes, comprising a turbine cooling blade; the turbine cooling blade comprises an outer wall, an inner cavity, an inner wall, a plurality of spread-wise arranged bifurcated cooling pipes, a plurality of flow-wise arranged bifurcated cooling pipes and a tandem cooling pipe; the inner cavity is arranged in the outer wall; the inner wall is arranged in the inner cavity; the plurality of spread-wise arranged bifurcated cooling pipes, the plurality of flow-wise arranged bifurcated cooling pipes and the tandem cooling pipe are connected with the inner wall and the outer wall; and the plurality of spread-wise arranged bifurcated cooling pipes, the plurality of flow-wise arranged bifurcated cooling pipes and the tandem cooling pipe are arranged on the turbine cooling blade. By adopting the structure of the plurality of spread-wise arranged bifurcated cooling pipes, the plurality of flow-wise arranged bifurcated cooling pipes and the tandem cooling pipe, the contact area of the cooling fluid and the cooling pipe can be increased, the cooling fluid can be more fully exchanged with the blade, and the cooling efficiency is improved.

Description

Technical Field

[0001] This invention relates to the technical field of turbine blades, and more specifically, to turbine blades having bifurcated cooling channels and tandem cooling channels. Background Technology

[0002] Turbine blades (or airfoils) operate in high-temperature, high-pressure environments and cannot function long-term without a cooling system. Existing technology includes turbine blades with cooling structures. Patent document CN111335960B discloses a component for a turbine engine that may include an airfoil, wherein an outer wall defines an outer surface defining the interior and defines a pressure side and a suction side, extending between the leading and trailing edges to define a chordal direction, and extending between the root and tip to define a spanwise direction. This component may also include at least one cooling passage internally. These turbine blade cooling systems can reduce the temperature of the turbine blade during operation, thereby extending its lifespan. However, the turbine blade's center is not a hollow structure, leading to increased structural weight. Furthermore, the first set of cooling passages extends along a first plane, and the second set extends along a second plane different from the first plane, preventing the cooling channels from extending along multiple planes for flexible control of the cooling range.

[0003] Therefore, a new technical solution is needed to improve the above-mentioned technical problems. Summary of the Invention

[0004] In view of the deficiencies in the prior art, the purpose of this invention is to provide a turbine blade with bifurcated cooling pipes and tandem cooling pipes.

[0005] According to the present invention, a turbine blade having bifurcated cooling pipes and tandem cooling pipes includes a turbine cooling blade; the turbine cooling blade includes an outer wall, an inner cavity, an inner wall, multi-stage bifurcated cooling pipes arranged in the spanwise direction, multi-stage bifurcated cooling pipes arranged in the flowwise direction, and tandem cooling pipes;

[0006] The inner cavity is located inside the outer wall; the inner wall is located inside the inner cavity; the spanwise multi-stage branched cooling pipes are connected to the outer wall, and the spanwise multi-stage branched cooling pipes, the flow-oriented multi-stage branched cooling pipes, and the tandem cooling pipes are connected to the inner wall and the outer wall; the spanwise multi-stage branched cooling pipes, the flow-oriented multi-stage branched cooling pipes, and the tandem cooling pipes are located on the turbine cooling blades.

[0007] Preferably, the outer wall includes a pressure surface, a suction surface, a leading edge, and a trailing edge; the spanwise multi-stage branched cooling pipes, the flow-oriented multi-stage branched cooling pipes, and the tandem cooling pipes can be simultaneously arranged on the turbine cooling blades, or only one or two of them can be used on the turbine cooling blades; the spanwise multi-stage branched cooling pipes are located at the leading edge, and each spanwise multi-stage branched cooling pipe includes a cooling pipe inlet and a cooling pipe outlet, and further includes multiple branch structures; the flow-oriented multi-stage branched cooling pipes are located at the pressure surface and suction surface, and each flow-oriented multi-stage branched cooling pipe includes a cooling pipe inlet and a cooling pipe outlet, and further includes multiple branch structures; the tandem cooling pipes include a cooling pipe inlet and a cooling pipe outlet, and further include multiple branch structures.

[0008] Preferably, the inner cavity is filled with a cooling medium, which flows from the cooling pipe inlet on the inner wall into the multi-stage branched cooling pipe, the multi-stage branched cooling pipe, and the tandem cooling pipe, and flows out from the cooling pipe outlet on the outer wall.

[0009] Preferably, the spanwise multi-stage branching cooling pipe includes a spanwise main cooling pipe and spanwise multi-stage cooling pipes. The number of stages in the spanwise multi-stage cooling pipe depends on the number of branches on a complete pipe. Starting from the spanwise main cooling pipe, the number of stages in the spanwise multi-stage cooling pipe increases by one for each branch, and the number of stages in the spanwise multi-stage cooling pipe is not less than one. Each stage of the spanwise multi-stage cooling pipe includes at least two pipes. The spanwise multi-stage cooling pipes of the same stage can have different diameters, and the spanwise multi-stage cooling pipes of the same stage are connected to the previous stage of the spanwise multi-stage cooling pipe. The included angles between pipes can be unequal; between two adjacent spanwise multi-stage cooling pipes, the diameter of the next spanwise multi-stage cooling pipe is not greater than the diameter of the previous spanwise multi-stage cooling pipe; the included angle between the spanwise main cooling pipe and the spanwise first-stage cooling pipe is between 60° and 90°, and except for the spanwise main cooling pipe, the included angle between each level of spanwise multi-stage cooling pipe and the next level of spanwise multi-stage cooling pipe is between 0° and 70°; the spanwise multi-stage branching cooling pipe also includes at least one cooling pipe inlet and at least two cooling pipe outlets.

[0010] Preferably, the cooling pipe outlets of the multi-stage branched cooling pipes arranged in a longitudinal direction are distributed in an arc shape near the leading edge; after the cooling medium flows out of the cooling pipe outlet, it will form a cooling gas film, and the cooling medium will flow along the outer wall; the cooling pipe outlets of the multi-stage branched cooling pipes arranged in a longitudinal direction have an appropriate relative position with the cooling pipe outlets of adjacent multi-stage branched cooling pipes arranged in a longitudinal direction, so that the cooling gas films formed by the two do not overlap; the length of the cooling pipe corresponding to each cooling pipe outlet of the multi-stage branched cooling pipes arranged in a longitudinal direction should be greater than 1.5 times the distance between the outer wall and the inner wall at the leading edge.

[0011] Preferably, the multi-stage branching cooling pipes with flow direction arrangement include a main cooling pipe and multi-stage cooling pipes. The number of stages in the multi-stage cooling pipes depends on the number of branches on a complete pipe. Starting from the main cooling pipe, the number of stages in the multi-stage cooling pipes increases by one for each branch, and the number of stages in the multi-stage cooling pipes is not less than one. Each stage of the multi-stage cooling pipes includes at least two pipes. The same stage of the multi-stage cooling pipes can have different diameters, and the angle between the same stage of the multi-stage cooling pipes and the previous stage can be unequal. Between adjacent stages of the multi-stage cooling pipes, the lower... The diameter of the primary flow-to-multi-stage cooling pipe is no greater than the diameter of the previous primary flow-to-multi-stage cooling pipe; the included angle between two adjacent flow-to-multi-stage cooling pipes is between 0° and 70°; the flow-to-multi-stage branching cooling pipe also includes at least one cooling pipe inlet and at least two cooling pipe outlets; the cooling pipe outlets of the flow-to-multi-stage branching cooling pipe are distributed in an arc shape on the outer wall; the cooling medium will form a cooling gas film after flowing out of the cooling pipe outlet; the length of the cooling pipe corresponding to each cooling pipe outlet of the flow-to-multi-stage branching cooling pipe should be greater than 1.5 times the distance between the outer wall and the inner wall at the local pressure surface or suction surface.

[0012] Preferably, the tandem cooling pipes include at least two periodic tandem cooling pipes, the shapes of which include, but are not limited to, hexagons, triangles, quadrilaterals, and octagons; the periodic tandem cooling pipes are similar in shape, but the diameters of different periodic tandem cooling pipes can be different; the cooling medium is allowed to branch and merge in the tandem cooling pipes, and multiple tandem cooling pipes can be interconnected; the tandem cooling pipes can be arranged along the contour of the outer wall, and the tandem cooling pipes can be arranged in a curved surface with equal or variable spacing from the outer wall; the tandem cooling pipes can be set into irregular shapes, thereby effectively cooling the blades according to the heat load distribution of the turbine cooling blades; the tandem cooling pipes also include at least one cooling pipe inlet and at least two cooling pipe outlets; the cooling medium will form a cooling gas film after flowing out of the cooling pipe outlets; the length of the cooling pipe corresponding to each cooling pipe outlet of the tandem cooling pipes should be greater than five times the outlet diameter.

[0013] Preferably, the spanwise multi-stage bifurcated cooling pipes do not intersect with adjacent spanwise multi-stage bifurcated cooling pipes in space, but their projections onto the outer wall normal overlap to form a good internal cooling effect; multiple spanwise multi-stage bifurcated cooling pipes are arranged along the spanwise direction on the leading edge of the blade, and in the direction along the inner normal of the outer wall, the bifurcation positions of adjacent spanwise multi-stage bifurcated cooling pipes and the air film formed by the cooling pipe outlets do not coincide, and the air films formed by the cooling pipe outlets of adjacent spanwise multi-stage bifurcated cooling pipes do not coincide.

[0014] Preferably, the multi-stage branched cooling pipes and tandem cooling pipes arranged in the flow direction can be positioned at any location on the turbine cooling blade, including the pressure surface, suction surface, leading edge, and trailing edge. Multiple multi-stage branched cooling pipes and tandem cooling pipes, or a combination of both, are arranged at these locations. The combination of multiple multi-stage branched cooling pipes can be arrayed, staggered, or arranged according to other rules. The multi-stage branched cooling pipes do not spatially intersect with adjacent multi-stage branched cooling pipes, and their projections onto the outer wall do not overlap or only partially overlap. The combination of multiple multi-stage branched cooling pipes covers the outer wall of the blade. The air film formed at the cooling pipe outlets does not overlap. In areas with high heat load, the pipe density in the combination of multiple multi-stage branched cooling pipes and tandem cooling pipes should be greater than in areas with low heat load.

[0015] Preferably, the tandem cooling pipes are positioned near the tail edge of the pressure surface and near the tail edge of the suction surface. In these positions, the periodic tandem cooling pipes in the tandem cooling pipes can cover a larger area than longitudinally arranged multi-stage branched cooling pipes and flow-oriented multi-stage branched cooling pipes and their combinations.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The present invention adopts a structure of multi-stage branched cooling pipes arranged in the spanwise direction, multi-stage branched cooling pipes arranged in the flow direction, and tandem cooling pipes, which can increase the contact area between the cooling medium and the cooling pipes, enabling the cooling fluid to exchange heat more fully with the blades and improving the cooling efficiency.

[0018] 2. This invention employs adjustable cooling pipe diameters and angles, such as the angle between spanwise multi-stage bifurcated cooling pipes and the first spanwise primary cooling pipe and the second spanwise primary cooling pipe. This allows spanwise multi-stage bifurcated cooling pipes, flow-oriented multi-stage bifurcated cooling pipes, and tandem cooling pipes to cover irregular areas. This enables flexible adjustment of the cooling pipe configuration and improves the cooling efficiency of the blades under uneven heat loads.

[0019] 3. The present invention employs adjustable multi-stage branched cooling pipes arranged in the longitudinal direction, multi-stage branched cooling pipes arranged in the flow direction, and tandem cooling pipes, for example, they can be set on the pressure surface, suction surface, leading edge, and trailing edge, thereby allowing for flexible arrangement of cooling pipes. In areas with high heat load, cooling pipes can be arranged at a higher density, which can make the temperature of the outer wall more uniform.

[0020] 4. By adopting a cooling pipe outlet structure, the present invention allows the cooling medium to form a cooling gas film on the outer wall after flowing out of the cooling pipe, preventing the high-temperature mainstream from directly contacting the outer wall, thus improving the thermal protection effect on the turbine cooling blades. Attached Figure Description

[0021] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0022] Figure 1 This is a schematic diagram of the turbine cooling blade of the present invention;

[0023] Figure 2 This is a schematic diagram of the structure of the longitudinally arranged multi-stage branched cooling pipe of the present invention;

[0024] Figure 3 This is a schematic diagram of the multi-stage branching cooling pipe with flow direction arrangement according to the present invention;

[0025] Figure 4 This is a schematic diagram of the tandem cooling pipe structure of the present invention.

[0026] in:

[0027] Turbine cooling blade 1 Cooling pipe inlet 111

[0028] Outer wall 10, main cooling duct 121

[0029] Inner wall 11 First spanwise primary cooling pipe 122

[0030] Multi-stage branching cooling pipes arranged longitudinally 12 Second longitudinal primary cooling pipes 123

[0031] Flow direction arrangement of multi-stage branching cooling pipes 13 and longitudinal two-stage cooling pipes 124

[0032] 14 tandem cooling pipes; 125 longitudinal tertiary cooling pipes

[0033] Pressure surface 101 flows to main cooling pipe 131

[0034] Suction surface 102 First flow direction primary cooling pipe 132

[0035] Leading edge 103 Second flow direction primary cooling pipe 133

[0036] Trailing edge 104 flows to secondary cooling pipe 134

[0037] Cooling pipe outlet 105 flows to tertiary cooling pipe 135

[0038] Periodic tandem cooling pipes 141 Detailed Implementation

[0039] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the invention in any way. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all fall within the protection scope of the present invention.

[0040] Example 1:

[0041] According to the present invention, a turbine blade having branched cooling pipes and tandem cooling pipes includes a turbine cooling blade 1; the turbine cooling blade 1 includes an outer wall 10, an inner cavity, an inner wall 11, spanwise arranged multi-stage branched cooling pipes 12, flow-oriented multi-stage branched cooling pipes 13, and tandem cooling pipes 14; the inner cavity is disposed within the outer wall 10; the inner wall 11 is disposed within the inner cavity; the spanwise arranged multi-stage branched cooling pipes 12 are connected to the outer wall 10, and the spanwise arranged multi-stage branched cooling pipes 12, flow-oriented multi-stage branched cooling pipes 13, and tandem cooling pipes 14 are connected to the inner wall 11 and the outer wall 10; the spanwise arranged multi-stage branched cooling pipes 12, flow-oriented multi-stage branched cooling pipes 13, and tandem cooling pipes 14 are disposed on the turbine cooling blade 1.

[0042] The outer wall 10 includes a pressure surface 101, a suction surface 102, a leading edge 103, and a trailing edge 104; the spanwise multi-stage branched cooling pipes 12, the flow-oriented multi-stage branched cooling pipes 13, and the tandem cooling pipes 14 can be simultaneously arranged on the turbine cooling blades 1, or only one or two of them can be used on the turbine cooling blades 1; the spanwise multi-stage branched cooling pipes 12 are located at the leading edge 103, and the spanwise multi-stage branched cooling pipes 12 include a cooling pipe inlet 111 and a cooling pipe outlet 105. The multi-stage branched cooling pipe 12 arranged in the longitudinal direction also includes multiple branch structures; the multi-stage branched cooling pipe 13 arranged in the flow direction is located at the pressure surface 101 and the suction surface 102, the multi-stage branched cooling pipe 13 arranged in the flow direction includes a cooling pipe inlet 111 and a cooling pipe outlet 105, the multi-stage branched cooling pipe 13 arranged in the flow direction also includes multiple branch structures; the tandem cooling pipe 14 includes a cooling pipe inlet 111 and a cooling pipe outlet 105, the tandem cooling pipe 14 also includes multiple branch structures.

[0043] The inner cavity is filled with cooling medium. The cooling medium flows from the cooling pipe inlet 111 on the inner wall 11 into the longitudinally arranged multi-stage branched cooling pipe 12, the longitudinally arranged multi-stage branched cooling pipe 13 and the tandem cooling pipe 14, and flows out from the cooling pipe outlet 105 on the outer wall 10.

[0044] The spanwise multi-stage branching cooling conduit 12 includes a spanwise main cooling conduit 121 and spanwise multi-stage cooling conduits. The number of stages in the spanwise multi-stage cooling conduit depends on the number of branches on a complete conduit. Starting from the spanwise main cooling conduit 121, the number of stages in the spanwise multi-stage cooling conduit increases by one for each branch, and the number of stages in the spanwise multi-stage cooling conduit is not less than one. Each stage of the spanwise multi-stage cooling conduit includes at least two conduits. The spanwise multi-stage cooling conduits of the same stage can have different diameters, and the spacing between the spanwise multi-stage cooling conduits of the same stage and the previous stage is [not specified]. The angles can be unequal; between two adjacent spanwise multi-stage cooling pipes, the diameter of the next spanwise multi-stage cooling pipe is not greater than the diameter of the previous spanwise multi-stage cooling pipe; the included angle between the spanwise main cooling pipe 121 and the spanwise first-stage cooling pipe is between 60° and 90°, and except for the spanwise main cooling pipe 121, the included angle between each level of spanwise multi-stage cooling pipe and the next level of spanwise multi-stage cooling pipe is between 0° and 70°; the spanwise multi-stage branching cooling pipe 12 also includes at least one cooling pipe inlet 111 and at least two cooling pipe outlets 105.

[0045] The cooling pipe outlets 105 of the multi-stage branched cooling pipes 12 arranged in a longitudinal direction are distributed in an arc shape near the leading edge 103. After the cooling medium flows out of the cooling pipe outlets 105, it will form a cooling gas film, and the cooling medium will flow along the outer wall 10. The cooling pipe outlets 105 of the multi-stage branched cooling pipes 12 arranged in a longitudinal direction have appropriate relative positions with the cooling pipe outlets 105 of the adjacent multi-stage branched cooling pipes 12 arranged in a longitudinal direction, so that the cooling gas films formed by the two do not overlap. The length of the cooling pipe corresponding to each cooling pipe outlet 105 of the multi-stage branched cooling pipes 12 arranged in a longitudinal direction should be greater than 1.5 times the distance between the outer wall and the inner wall at the leading edge.

[0046] The multi-stage branching cooling pipe 13 includes a main cooling pipe 131 and multi-stage cooling pipes. The number of stages in the multi-stage cooling pipes depends on the number of branches on a complete pipe. Starting from the main cooling pipe 131, the number of stages in the multi-stage cooling pipes increases by one for each branch, and the number of stages in the multi-stage cooling pipes is not less than one. Each stage of the multi-stage cooling pipes includes at least two pipes. The same stage of the multi-stage cooling pipes can have different diameters, and the angle between the same stage of the multi-stage cooling pipes and the previous stage can be unequal. Between two adjacent stages of the multi-stage cooling pipes, the angle between the next stage of the multi-stage cooling pipes... The diameter is not greater than the diameter of the preceding multi-stage cooling pipe; the included angle between two adjacent multi-stage cooling pipes is between 0° and 70°; the multi-stage branched cooling pipe 13 further includes at least one cooling pipe inlet 111 and at least two cooling pipe outlets 105; the cooling pipe outlets 105 of the multi-stage branched cooling pipe 13 are distributed in an arc shape on the outer wall 10; the cooling medium will form a cooling gas film after flowing out of the cooling pipe outlet 105; the length of the cooling pipe corresponding to each cooling pipe outlet 105 of the multi-stage branched cooling pipe 13 should be greater than 1.5 times the distance between the outer wall and the inner wall at the local pressure surface or suction surface.

[0047] The tandem cooling conduit 14 includes at least two periodic tandem cooling conduits 141, the shape of which includes, but is not limited to, hexagons, triangles, quadrilaterals, and octagons; the periodic tandem cooling conduits 141 are similar in shape, but the diameters of different periodic tandem cooling conduits 141 can be different; the cooling medium is allowed to branch and merge in the tandem cooling conduit 14, and multiple tandem cooling conduits 14 can be interconnected; the tandem cooling conduits 14 can be arranged along the contour of the outer wall, and the tandem cooling conduits 14 can be arranged in a curved surface with equal or variable spacing from the outer wall; the tandem cooling conduits 14 can be set in an irregular shape, thereby effectively cooling the turbine cooling blades 1 according to the heat load distribution; the tandem cooling conduit 14 also includes at least one cooling conduit inlet 111 and at least two cooling conduit outlets 105; the cooling medium will form a cooling gas film after flowing out of the cooling conduit outlet 105; the length of the cooling conduit corresponding to each cooling conduit outlet 105 of the tandem cooling conduit 14 should be greater than five times the outlet diameter.

[0048] The spanwise multi-stage bifurcated cooling pipes 12 do not intersect with adjacent spanwise multi-stage bifurcated cooling pipes 12 in space, but their projections onto the outer wall 10 in the normal direction overlap to form a good internal cooling effect. Multiple spanwise multi-stage bifurcated cooling pipes 12 are arranged along the spanwise direction on the leading edge of the blade. In the direction along the inner normal direction of the outer wall 10, the bifurcation positions of adjacent spanwise multi-stage bifurcated cooling pipes 12 and the air film formed by the cooling pipe outlet 105 do not coincide. The air film formed by the cooling pipe outlet 105 of adjacent spanwise multi-stage bifurcated cooling pipes 12 does not coincide.

[0049] The multi-stage branched cooling pipes 13 and tandem cooling pipes 14 arranged in a flow direction can be positioned at any location on the turbine cooling blade 1, including the pressure surface 101, suction surface 102, leading edge 103, and trailing edge 104. Multiple multi-stage branched cooling pipes 13 and tandem cooling pipes 14, or combinations thereof, are arranged at these locations. The combination of multiple multi-stage branched cooling pipes 13 can be arrayed, staggered, or arranged according to other rules. The multi-stage branched cooling pipes 13 do not spatially intersect with adjacent multi-stage branched cooling pipes 13, and their projections onto the outer wall normal do not overlap or only partially overlap. The combination of multiple multi-stage branched cooling pipes 13 covers the outer wall 10 of the blade. The air film formed at the cooling pipe outlet 105 does not overlap. In areas with high heat load, the pipe density in the combination of multiple multi-stage branched cooling pipes 13 and tandem cooling pipes 14 should be greater than in areas with low heat load.

[0050] The tandem cooling pipes 14 are positioned near the tail edge 104 on the pressure surface 101 and near the tail edge 104 on the suction surface 102. In these positions, the periodic tandem cooling pipes 141 in the tandem cooling pipes 14 can cover a larger area than the spanwise multi-stage branched cooling pipes 12 and the flowwise multi-stage branched cooling pipes 13 and their combinations.

[0051] Example 2:

[0052] Multi-stage branched cooling pipes 12 arranged in the spanwise direction, multi-stage branched cooling pipes 13 arranged in the flow direction, and tandem cooling pipes 14 are arranged inside the turbine blade, so that the cooling medium flows from inside the blade through the cooling pipes and flows out from the cooling pipe outlet 105 on the blade surface; after the cooling medium flows out of the cooling pipe outlet 105, it forms a cooling gas film, preventing the high-temperature mainstream from directly contacting the outer wall 10.

[0053] This invention discloses a turbine cooling blade 1, which includes an outer wall 10, comprising a pressure surface 101, a suction surface 102, a leading edge 103, and a trailing edge 104. The turbine cooling blade 1 also includes an inner cavity (not shown), surrounded by the outer wall 10, and having an inner wall 11. The turbine cooling blade 1 further includes at least one spanwise multi-stage branched cooling pipe 12, a flow-oriented multi-stage branched cooling pipe 13, and a series cooling pipe 14. The spanwise multi-stage branched cooling pipe 12 is located at the leading edge 103 and includes a cooling pipe inlet 111 and a cooling pipe outlet 105. The spanwise multi-stage branched cooling pipe 12 also includes multiple branching structures, allowing the cooling medium to form multiple bifurcated flow states within it. The multi-stage branched cooling pipe 13 is positioned at the pressure surface 101 and the suction surface 102, and includes a cooling pipe inlet 111 and a cooling pipe outlet 105. The multi-stage branched cooling pipe 13 also includes multiple branching structures, allowing the cooling medium to undergo multiple bifurcation flows within it. The tandem cooling pipe 14 includes a cooling pipe inlet 111 and a cooling pipe outlet 105, and also includes multiple branching structures. The cooling medium within the tandem cooling pipe 14 can undergo multiple bifurcation flows, sometimes splitting and sometimes merging, at different branching structures.

[0054] The inner cavity of the turbine cooling blade 1 is filled with cooling medium. The cooling medium flows from the cooling pipe inlet 111 on the inner wall 11 into the multi-stage branched cooling pipe 12 arranged in a longitudinal direction, flows into the multi-stage branched cooling pipe 13 and the tandem cooling pipe 14, and flows out from the cooling pipe outlet 105 on the outer wall 10.

[0055] The spanwise multi-stage branching cooling conduit 12 includes a spanwise main cooling conduit 121 and spanwise multi-stage cooling conduits. The number of stages in the spanwise multi-stage cooling conduit depends on the number of branches on a complete conduit. Starting from the spanwise main cooling conduit 121 (which can be considered as a spanwise zero-stage cooling conduit), the number of stages in the spanwise multi-stage cooling conduit increases by 1 with each branch, and the number of stages in the spanwise multi-stage cooling conduit is not less than 1. Each stage of the spanwise multi-stage cooling conduit contains no fewer than 2 conduits, such as a first spanwise first-stage cooling conduit 122 and a second spanwise first-stage cooling conduit 123. The spanwise multi-stage cooling conduits of the same stage can have different diameters, and the angle between a spanwise multi-stage cooling conduit of the same stage and the previous stage can be unequal. Between two adjacent stages of the spanwise multi-stage cooling conduit, the diameter of the next stage of the spanwise multi-stage cooling conduit is not greater than the diameter of the previous stage. The angle between the spanwise main cooling pipe 121 and the spanwise first-stage cooling pipe is between 60° and 90°, taking the angle between the flow direction vectors. Except for the spanwise main cooling pipe 121, the angle between each stage of the spanwise multi-stage cooling pipe and the next stage of the spanwise multi-stage cooling pipe is between 0° and 70°. The spanwise multi-stage branching cooling pipe 12 also includes at least one cooling pipe inlet 111 and at least two cooling pipe outlets 105. Preferably, the cooling pipe outlets 105 of the spanwise multi-stage branching cooling pipe 12 are distributed in an arc shape near the leading edge 10. It can be expected that the cooling medium will form a cooling film after flowing out of the cooling pipe outlet 105; in other words, the cooling medium will flow along the outer wall 10 after flowing out of the cooling pipe outlet 105, avoiding direct contact between the outer wall 10 and the high-temperature mainstream. The length of the cooling pipe corresponding to each cooling pipe outlet 105 of the longitudinally arranged multi-stage branched cooling pipe 12 should be greater than 1.5 times the distance between the outer wall 10 and the inner wall 11 at the leading edge 103.

[0056] The multi-stage branching cooling pipe 13 includes a main cooling pipe 131 and multi-stage cooling pipes. The number of stages in the multi-stage cooling pipes depends on the number of branches on a complete pipe. Starting from the main cooling pipe 131 (which can be considered as the zero-stage cooling pipe), the number of stages in the multi-stage cooling pipe increases by 1 with each branch, and the number of stages in the multi-stage cooling pipe is not less than 1. Each stage of the multi-stage cooling pipe contains at least two pipes, such as a first-stage cooling channel 132 and a second-stage cooling channel 133. The same stage of the multi-stage cooling pipe can have different diameters, and the angle between the same stage and the previous stage can be unequal. Between two adjacent stages of the multi-stage cooling pipe, the diameter of the next stage cannot be greater than the diameter of the previous stage. The angle between two adjacent stages of the multi-stage cooling pipe is between 0° and 70°, calculated from the angle of the flow direction vector. The multi-stage branching cooling pipes 13 further include at least one cooling pipe inlet 111 and at least two cooling pipe outlets 105. Preferably, the cooling pipe outlets 105 of the multi-stage branching cooling pipes 13 are distributed in an arc shape on the outer wall 10. It can be expected that the cooling medium will form a cooling gas film after flowing out of the cooling pipe outlets 105. The length of the cooling pipe corresponding to each cooling pipe outlet 105 of the multi-stage branching cooling pipes 13 should be greater than 1.5 times the distance between the outer wall 10 and the inner wall 11 at the local pressure surface 101 or suction surface 102.

[0057] The tandem cooling conduit 14 comprises at least two periodically tandem conduits 141, the shapes of which include, but are not limited to, hexagons, octagons, and annular shapes. The periodically tandem conduits 141 are similar in shape, but the diameters of the different conduits may differ. Cooling fluids are allowed to branch and merge within the tandem cooling conduit 14, and multiple tandem cooling conduits 14 can be interconnected. Preferably, the tandem cooling conduits 14 can be arranged along the contour of the outer wall 10; in other words, the tandem cooling conduits 14 can be arranged in a curved surface with equal or varying spacing from the outer wall 10. Preferably, the tandem cooling conduits 14 can be configured with an irregular shape to effectively cool the turbine cooling blades 1 according to the heat load distribution. The tandem cooling conduit 14 also includes at least one cooling conduit inlet 111 and at least two cooling conduit outlets 105. It is anticipated that the cooling medium will form a cooling film after flowing out of the cooling conduit outlets 105. The length of the cooling pipe corresponding to each cooling pipe outlet 105 of the tandem cooling pipe 14 should be greater than five times the outlet diameter.

[0058] The spanwise multi-stage bifurcated cooling pipes 12 do not intersect with adjacent spanwise multi-stage bifurcated cooling pipes 12 in space, but their projections onto the outer wall 10 in the normal direction overlap to form a good internal cooling effect. Multiple spanwise multi-stage bifurcated cooling pipes 12 are arranged along the spanwise direction on the leading edge 103 of the blade. In the direction along the inner normal direction of the outer wall 10, the bifurcation positions of adjacent spanwise multi-stage bifurcated cooling pipes 12 and the air film formed by the cooling pipe outlets 105 should avoid overlapping. The air film formed by the cooling pipe outlets 105 of adjacent spanwise multi-stage bifurcated cooling pipes 12 should also avoid overlapping. This can enhance the uniformity of cooling at the leading edge 103.

[0059] The multi-stage branched cooling pipes 13 and tandem cooling pipes 14 arranged in the flow direction can be set at any position of the turbine cooling blade 1, including the pressure surface 101, suction surface 102, leading edge 103 and trailing edge 104. Multiple multi-stage branched cooling pipes 13 or tandem cooling pipes 14, as well as combinations of both, can be set at the positions. The combination of multiple flow-direction multi-stage branching cooling pipes 13 includes array, staggered, and other combinations. The flow-direction multi-stage branching cooling pipes 13 do not intersect with adjacent flow-direction multi-stage branching cooling pipes 13 in space, and their projections on the outer wall 11 in the normal direction do not overlap or have partial overlap. The combination of multiple flow-direction multi-stage branching cooling pipes 13 should cover the outer wall 10 of the blades as completely as possible. The air film formed at the cooling pipe outlet 105 of the flow-direction multi-stage branching cooling pipes 13 should avoid overlapping, which can improve the uniformity of the cooling effect. In areas with high heat load, the pipe density in the combination 14 of multiple flow-direction multi-stage branching cooling pipes 13 and tandem cooling pipes should be greater than in areas with low heat load. A larger cooling pipe diameter can also be used to enhance the cooling effect.

[0060] The tandem cooling pipes 14 are positioned near the tail edge 104 on the pressure surface 101 and near the tail edge 104 on the suction surface 102. The periodic tandem pipes 141 within the tandem cooling pipes 14 can cover a larger area than the spanwise multi-stage branched cooling pipes 12 and the flowwise multi-stage branched cooling pipes 13 and their combinations, thereby effectively cooling these locations. Multiple non-connected tandem cooling pipes 14 can be positioned at these locations. The projections of the multiple tandem cooling pipes 14 onto the outer wall 11 in the normal direction do not overlap or have partial overlap. The air films formed by the cooling pipe outlets 105 of the multiple tandem cooling pipes 14 can overlap.

[0061] Those skilled in the art can understand this embodiment as a more specific description of Embodiment 1.

[0062] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0063] Specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. Unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

Claims

1. A turbine blade having branched cooling pipes and tandem cooling pipes, characterized in that, It includes turbine cooling blades (1); the turbine cooling blades (1) include an outer wall (10), an inner cavity, an inner wall (11), a multi-stage branched cooling pipe (12) arranged in the spanwise direction, a multi-stage branched cooling pipe (13) arranged in the flow direction, and a series cooling pipe (14). The inner cavity is located inside the outer wall (10); the inner wall (11) is located inside the inner cavity; the spanwise multi-stage branched cooling pipe (12) is connected to the outer wall (10); the spanwise multi-stage branched cooling pipe (12), the flow-oriented multi-stage branched cooling pipe (13), and the tandem cooling pipe (14) are connected to the inner wall (11) and the outer wall (10); the spanwise multi-stage branched cooling pipe (12), the flow-oriented multi-stage branched cooling pipe (13), and the tandem cooling pipe (14) are located on the turbine cooling blade (1); The outer wall (10) includes a pressure surface (101), a suction surface (102), a leading edge (103), and a trailing edge (104); the spanwise multi-stage bifurcated cooling pipes (12), the flow-oriented multi-stage bifurcated cooling pipes (13), and the tandem cooling pipes (14) can be simultaneously arranged on the turbine cooling blades (1); the spanwise multi-stage bifurcated cooling pipes (12) are located at the leading edge (103), and the spanwise multi-stage bifurcated cooling pipes (12) include a cooling pipe inlet (111) and a cooling pipe outlet (105). The forked cooling pipe (12) also includes multiple branch structures; the multi-stage branched cooling pipe (13) with flow direction arrangement is located at the pressure surface (101) and the suction surface (102), the multi-stage branched cooling pipe (13) with flow direction arrangement includes a cooling pipe inlet (111) and a cooling pipe outlet (105), the multi-stage branched cooling pipe (13) with flow direction arrangement also includes multiple branch structures; the serial cooling pipe (14) includes a cooling pipe inlet (111) and a cooling pipe outlet (105), the serial cooling pipe (14) also includes multiple branch structures; The spanwise multi-stage branched cooling pipe (12) includes a spanwise main cooling pipe (121) and spanwise multi-stage cooling pipes. The number of stages of the spanwise multi-stage cooling pipe depends on the number of branches on a complete pipe. Starting from the spanwise main cooling pipe (121), the number of stages of the spanwise multi-stage cooling pipe increases by one for each branch, and the number of stages of the spanwise multi-stage cooling pipe is not less than one. Each stage of the spanwise multi-stage cooling pipe includes no less than two pipes. The spanwise multi-stage cooling pipes of the same stage can have different diameters, and the angle between the spanwise multi-stage cooling pipe of the same stage and the previous stage of the spanwise multi-stage cooling pipe is... The diameters of the next stage of the multi-stage cooling pipes are not greater than the diameter of the previous stage of the multi-stage cooling pipes; the angle between the main cooling pipe (121) and the first-stage cooling pipe is between 60° and 90°; except for the main cooling pipe (121), the angle between each stage of the multi-stage cooling pipe and the next stage of the multi-stage cooling pipe is between 0° and 70°; the multi-stage branching cooling pipe (12) also includes at least one cooling pipe inlet (111) and at least two cooling pipe outlets (105).

2. The turbine blade with branched cooling pipes and tandem cooling pipes according to claim 1, characterized in that, The inner cavity is filled with cooling medium, which flows from the cooling pipe inlet (111) on the inner wall (11) into the longitudinally arranged multi-level branched cooling pipe (12), the longitudinally arranged multi-level branched cooling pipe (13) and the tandem cooling pipe (14), and flows out from the cooling pipe outlet (105) on the outer wall (10).

3. The turbine blade with branched cooling pipes and tandem cooling pipes according to claim 1, characterized in that, The cooling pipe outlets (105) of the longitudinally arranged multi-stage bifurcated cooling pipes (12) are distributed in an arc shape near the leading edge (103); after the cooling medium flows out from the cooling pipe outlets (105), it will form a cooling gas film, and the cooling medium will flow along the outer wall (10); the cooling pipe outlets (105) of the longitudinally arranged multi-stage bifurcated cooling pipes (12) and the cooling pipe outlets (105) of the longitudinally adjacent longitudinally arranged multi-stage bifurcated cooling pipes (12) have appropriate relative positions so that the cooling gas films formed by the two do not overlap; the cooling pipe length corresponding to each cooling pipe outlet (105) of the longitudinally arranged multi-stage bifurcated cooling pipes (12) should be greater than 1.5 times the distance between the outer wall and the inner wall at the leading edge.

4. The turbine blade with branched cooling pipes and tandem cooling pipes according to claim 1, characterized in that, The multi-stage branching cooling pipes (13) with flowing direction include a main cooling pipe (131) and multi-stage cooling pipes. The number of stages of the multi-stage cooling pipes depends on the number of branches on a complete pipe. Starting from the main cooling pipe (131), the number of stages of the multi-stage cooling pipes increases by one for each branch, and the number of stages of the multi-stage cooling pipes is not less than one. Each stage of the multi-stage cooling pipes includes at least two pipes. The same stage of the multi-stage cooling pipes can have different diameters, and the angle between the same stage of the multi-stage cooling pipes and the previous stage of the multi-stage cooling pipes can be unequal. Between two adjacent stages of the multi-stage cooling pipes, the diameter of the next stage of the multi-stage cooling pipes is not greater than [missing value]. The diameter of the upper-level flow direction multi-stage cooling pipe; the included angle between two adjacent flow direction multi-stage cooling pipes is between 0° and 70°; the flow direction multi-stage branched cooling pipe (13) also includes at least one cooling pipe inlet (111) and at least two cooling pipe outlets (105); the cooling pipe outlets (105) of the flow direction multi-stage branched cooling pipe (13) are distributed in an arc shape on the outer wall (10); the cooling medium will form a cooling gas film after flowing out from the cooling pipe outlet (105); the length of the cooling pipe corresponding to each cooling pipe outlet (105) of the flow direction multi-stage branched cooling pipe (13) should be greater than 1.5 times the distance between the outer wall and the inner wall at the local pressure surface or suction surface.

5. The turbine blade with branched cooling pipes and tandem cooling pipes according to claim 1, characterized in that, The tandem cooling pipes (14) include at least two periodic tandem cooling pipes (141), the shape of which includes hexagons, triangles, quadrilaterals, and octagons; the periodic tandem cooling pipes (141) are similar in shape, and the diameters of different periodic tandem cooling pipes (141) can be different; the cooling medium is allowed to branch and merge in the tandem cooling pipes (14), and multiple tandem cooling pipes (14) can be interconnected; the tandem cooling pipes (14) can be arranged along the contour of the outer wall, and the tandem cooling pipes... The channel (14) can be set in a curved surface with equal or variable spacing from the outer wall; the tandem cooling channel (14) can be set in an irregular shape to effectively cool the blades according to the heat load distribution of the turbine cooling blades (1); the tandem cooling channel (14) also includes at least one cooling channel inlet (111) and at least two cooling channel outlets (105); the cooling medium will form a cooling gas film after flowing out from the cooling channel outlet (105); the cooling channel length corresponding to each cooling channel outlet (105) of the tandem cooling channel (14) should be greater than five times the outlet diameter.

6. The turbine blade with branched cooling pipes and tandem cooling pipes according to claim 1, characterized in that, The spanwise multi-stage bifurcated cooling pipes (12) do not intersect with the adjacent spanwise multi-stage bifurcated cooling pipes (12) in space, but their projections on the outer wall (10) in the normal direction overlap to form a good internal cooling effect; multiple spanwise multi-stage bifurcated cooling pipes (12) are arranged along the spanwise direction on the leading edge of the blade. In the direction along the inner normal direction of the outer wall (10), the bifurcation positions of the adjacent spanwise multi-stage bifurcated cooling pipes (12) and the air film formed by the cooling pipe outlet (105) do not coincide, and the air film formed by the cooling pipe outlet (105) of the adjacent spanwise multi-stage bifurcated cooling pipes (12) does not coincide.

7. The turbine blade with branched cooling pipes and tandem cooling pipes according to claim 1, characterized in that, The multi-stage branched cooling pipes (13) and tandem cooling pipes (14) arranged in the flow direction can be set at any position on the turbine cooling blade (1), including the pressure surface (101), suction surface (102), leading edge (103), and trailing edge (104). Multiple multi-stage branched cooling pipes (13) and tandem cooling pipes (14) or a combination of both are set at these positions. The combination of multiple multi-stage branched cooling pipes (13) arranged in the flow direction includes array, staggered, and combinations according to other rules. The multi-stage branched cooling pipe (13) does not intersect with the adjacent multi-stage branched cooling pipe (13) in the flow direction in space. The projections of the two on the outer wall normal do not overlap or have partial overlap. The combination of multiple multi-stage branched cooling pipes (13) in the flow direction covers the outer wall (10) of the blade. The air film formed at the outlet (105) of the cooling pipe does not overlap. In areas with high heat load, the pipe density in the combination of multiple multi-stage branched cooling pipes (13) in the flow direction and the tandem cooling pipe (14) should be greater than in areas with low heat load.

8. The turbine blade with branched cooling pipes and tandem cooling pipes according to claim 1, characterized in that, The tandem cooling pipes (14) are positioned near the tail edge (104) on the pressure surface (101) and near the tail edge (104) on the suction surface (102). At these positions, the periodic tandem cooling pipes (141) in the tandem cooling pipes (14) can cover a larger area than the spanwise multi-stage branched cooling pipes (12) and the flowwise multi-stage branched cooling pipes (13) and their combinations.

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