Turbine blade with bifurcated cooling duct and tandem cooling duct

Abstract

A turbine blade with a bifurcated cooling duct and a tandem cooling duct. The turbine blade comprises a turbine cooling blade (1), and the turbine cooling blade (1) comprises an outer wall (10), an inner cavity, an inner wall (11), a spanwisely arranged multi-stage bifurcated cooling duct (12), a chordwisely arranged multi-stage bifurcated cooling duct (13), and a tandem cooling duct (14), wherein the inner cavity is arranged in the outer wall (10); the inner wall (11) is arranged in the inner cavity; the spanwisely arranged multi-stage bifurcated cooling duct (12) is connected to the outer wall (10), and the spanwisely arranged multi-stage bifurcated cooling duct (12), the chordwisely arranged multi-stage bifurcated cooling duct (13) and the tandem cooling tube (14) are connected to the inner wall (11) and the outer wall (10); and the spanwisely arranged multi-stage bifurcated cooling duct (12), the chordwisely arranged multi-stage bifurcated cooling duct (13) and the tandem cooling duct (14) are arranged on the turbine cooling blade (1). By means of using a structure of the spanwisely arranged multi-stage bifurcated cooling duct, the chordwisely arranged multi-stage bifurcated cooling duct and the tandem cooling duct, the structure can increase the contact area between a cooling fluid and the cooling ducts, and can allow for more adequate heat exchange between the cooling fluid and the blade, thereby increasing the cooling efficiency.

Description

Turbine blade with bifurcated cooling ducts and tandem cooling ducts Technical Field

[0001] The present invention relates to the technical field of turbine blades, and in particular to a turbine blade with bifurcated cooling channels and tandem cooling channels. Background Art

[0002] Because turbine blades (or airfoils) must operate in high-temperature, high-pressure environments, they cannot operate for long periods without a cooling system. Turbine blades with cooling structures exist in the prior art. Patent publication CN111335960B discloses a component, such as an airfoil, for use in a turbine engine. The airfoil comprises an outer wall defining an exterior surface that delimits an interior, defines a pressure side and a suction side, extends between a leading edge and a trailing edge to define a chordwise direction, and extends between a root and a tip to define a spanwise direction. The component may also include at least one cooling passage within the airfoil. These turbine blade cooling systems can reduce the operating temperature of the turbine blade, thereby extending the life of the turbine blade. However, the center of the turbine blade is not a hollow structure, which increases the weight of the turbine blade structure. A first set of cooling passages extends along a first plane, while a second set of cooling passages extends along a second plane different from the first. This prevents the cooling passages from extending along multiple planes, thereby flexibly controlling the cooling range.

[0003] Therefore, it is necessary to propose a new technical solution to improve the above technical problems.

[0004] Summary of the Invention

[0005] In view of the defects in the prior art, an object of the present invention is to provide a turbine blade with bifurcated cooling channels and serial cooling channels.

[0006] According to the present invention, a turbine blade having bifurcated cooling pipes and serial cooling pipes is provided, comprising a turbine cooling blade; the turbine cooling blade comprises an outer wall, an inner cavity, an inner wall, a span-wise arranged multi-stage bifurcated cooling pipe, a flow-wise arranged multi-stage bifurcated cooling pipe, and a serial cooling pipe;

[0007] The inner cavity is arranged in the outer wall; the inner wall is arranged in the inner cavity; the span-wise multi-stage bifurcated cooling pipe is connected to the outer wall, and the span-wise multi-stage bifurcated cooling pipe, the flow-wise multi-stage bifurcated cooling pipe and the serial cooling pipe are connected to the inner wall and the outer wall; the span-wise multi-stage bifurcated cooling pipe, the flow-wise multi-stage bifurcated cooling pipe and the serial cooling pipe are arranged on the turbine cooling blade.

[0008] Preferably, the outer wall includes a pressure surface, a suction surface, a leading edge and a trailing edge; the spanwise arranged multi-stage bifurcated cooling pipe, the flowwise arranged multi-stage bifurcated cooling pipe and the serial cooling pipe can be arranged on the turbine cooling blades at the same time, or only one or two of them are arranged on the turbine cooling blades; the spanwise arranged multi-stage bifurcated cooling pipe is arranged at the leading edge position, the spanwise arranged multi-stage bifurcated cooling pipe includes a cooling pipe inlet and a cooling pipe outlet, and the spanwise arranged multi-stage bifurcated cooling pipe also includes a plurality of bifurcated structures; the flowwise arranged multi-stage bifurcated cooling pipe is arranged at the pressure surface and the suction surface position, the flowwise arranged multi-stage bifurcated cooling pipe includes a cooling pipe inlet and a cooling pipe outlet, and the flowwise arranged multi-stage bifurcated cooling pipe also includes a plurality of bifurcated structures; the serial cooling pipe includes a cooling pipe inlet and a cooling pipe outlet, and the serial cooling pipe also includes a plurality of bifurcated structures.

[0009] Preferably, the inner cavity is filled with cooling medium, which flows from the cooling channel inlet on the inner wall into the span-wise arranged multi-stage bifurcated cooling channels, the flow-wise arranged multi-stage bifurcated cooling channels and the serial cooling channels, and flows out from the cooling channel outlet on the outer wall.

[0010] Preferably, the spanwise multi-stage bifurcated cooling pipes include a spanwise main cooling pipe and a spanwise multi-stage cooling pipe. The number of stages of the spanwise multi-stage cooling pipes depends on the number of branches on a complete pipe. Starting from the spanwise main cooling pipe, the number of stages of the spanwise multi-stage cooling pipes increases by one each time a branch is passed. The number of stages of the spanwise multi-stage cooling pipes is not less than one. Each stage of the spanwise multi-stage cooling pipes includes no less than two pipes. The spanwise multi-stage cooling pipes of the same stage can have different diameters. The spanwise multi-stage cooling pipes of the same stage and the spanwise multi-stage cooling pipes of the previous stage can have different diameters. The included angles between the pipes may not be equal; between two adjacent levels of spanwise multi-stage cooling pipes, the diameter of the spanwise multi-stage cooling pipe of the next level is not greater than the diameter of the spanwise multi-stage cooling pipe of the previous level; the included angle between the spanwise main cooling pipe and the spanwise first-level 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 spanwise multi-stage cooling pipe of the next level is between 0° and 70°; the spanwise arranged multi-stage bifurcated cooling pipe also includes at least one cooling pipe inlet and at least two cooling pipe outlets.

[0011] Preferably, the cooling pipe outlets of the spanwise arranged multi-stage bifurcated cooling pipes are distributed in an arc shape near the leading edge; the cooling medium will form a cooling air film after flowing out of the cooling pipe outlet, and the cooling medium will flow along the outer wall; the cooling pipe outlets of the spanwise arranged multi-stage bifurcated cooling pipes and the cooling pipe outlets of the spanwise adjacent multi-stage bifurcated cooling pipes are appropriately positioned relative to each other so that the cooling air films formed by the two do not overlap; the cooling pipe length corresponding to each cooling pipe outlet of the spanwise arranged multi-stage bifurcated cooling pipes should be greater than 1.5 times the distance between the outer wall and the inner wall at the leading edge.

[0012] Preferably, the multi-stage bifurcated cooling pipes arranged in the flow direction include a main cooling pipe and a multi-stage cooling pipe. 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, the number of stages of the multi-stage cooling pipes increases by one each time a branch is passed, 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 no less than two pipes. The multi-stage cooling pipes of the same stage can have different diameters, and the angles between the multi-stage cooling pipes of the same stage and the multi-stage cooling pipes of the previous stage can be unequal. Between the multi-stage cooling pipes of two adjacent stages, the lower stage is the cooling pipe of the cooling pipe. The diameter of a first-stage flow-oriented multi-stage cooling pipe is not greater than the diameter of a previous-stage flow-oriented multi-stage cooling pipe; the angle between two adjacent stages of the flow-oriented multi-stage cooling pipe is between 0° and 70°; the flow-oriented multi-stage bifurcated cooling pipe also includes at least one cooling pipe inlet and at least two cooling pipe outlets; the cooling pipe outlets of the flow-oriented multi-stage bifurcated cooling pipe are distributed on the outer wall in a circular arc shape; the cooling medium will form a cooling air film after flowing out of the cooling pipe outlet; the cooling pipe length corresponding to each cooling pipe outlet of the flow-oriented multi-stage bifurcated 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.

[0013] Preferably, the serial cooling pipe includes no less than two periodic serial cooling pipes, and the shapes of the periodic serial cooling pipes include but are not limited to hexagons, triangles, quadrilaterals, and octagons; the periodic serial cooling pipes are similar in shape, and the diameters of different periodic serial cooling pipes can be different; the cooling medium is allowed to branch and merge in the serial cooling pipe, and multiple serial cooling pipes can be connected to each other; the serial cooling pipe can be arranged along the contour of the outer wall, and the serial cooling pipe can be arranged in a curved surface with equal or variable spacing with the outer wall; the serial cooling pipe can be set to an irregular shape, so as to effectively cool the blades according to the heat load distribution of the turbine cooling blades; the serial cooling pipe also includes no less than one cooling pipe inlet and no less than two cooling pipe outlets; the cooling medium will form a cooling air film after flowing out of the cooling pipe outlet; the cooling pipe length corresponding to each cooling pipe outlet of the serial cooling pipe should be greater than five times the outlet diameter.

[0014] Preferably, the spanwise arranged multi-stage bifurcated cooling pipes do not intersect with the adjacent spanwise arranged multi-stage bifurcated cooling pipes in space, but the projections of the two on the normal direction of the outer wall overlap to form a good internal cooling effect; multiple spanwise arranged multi-stage bifurcated cooling pipes are arranged along the span direction at the leading edge of the blade, and in the direction along the inner normal direction of the outer wall, the bifurcation positions of the adjacent spanwise arranged multi-stage bifurcated cooling pipes and the air films formed at the cooling pipe outlets do not overlap, and the air films formed at the cooling pipe outlets of the adjacent spanwise arranged multi-stage bifurcated cooling pipes do not overlap.

[0015] Preferably, the flow-direction-arranged multi-stage bifurcated cooling pipes and serial cooling pipes can be set at any position of the turbine cooling blade, including the pressure surface, the suction surface, the leading edge and the trailing edge, and multiple flow-direction-arranged multi-stage bifurcated cooling pipes and serial cooling pipes or a combination of the two are set at the said positions; the combination of multiple flow-direction-arranged multi-stage bifurcated cooling pipes includes array, staggered and combinations according to other rules; the flow-direction-arranged multi-stage bifurcated cooling pipes do not intersect with the adjacent flow-direction-arranged multi-stage bifurcated cooling pipes in space, and the projections of the two on the outer wall normal do not overlap or have partial overlap, and the combination of multiple flow-direction-arranged multi-stage bifurcated cooling pipes covers the outer wall of the blade; the air films formed at the outlets of the cooling pipes do not overlap; in areas with high heat load, the density of the pipes in the combination of multiple flow-direction-arranged multi-stage bifurcated cooling pipes and serial cooling pipes should be greater than in areas with low heat load.

[0016] Preferably, the serial cooling pipes are arranged at positions close to the trailing edge on the pressure side and at positions close to the trailing edge on the suction side. At these positions, the periodic serial cooling pipes in the serial cooling pipes can cover a larger area than the span-wise arranged multi-stage bifurcated cooling pipes and the flow-wise arranged multi-stage bifurcated cooling pipes and their combinations.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. The present invention adopts a structure of multi-stage bifurcated cooling pipes arranged in a spanwise direction, multi-stage bifurcated cooling pipes arranged in a flowwise direction, and tandem cooling pipes, thereby increasing the contact area between the cooling medium and the cooling pipes, enabling more sufficient heat exchange between the cooling fluid and the blades, and improving cooling efficiency;

[0019] 2. The present invention utilizes adjustable cooling channel diameters and angles, such as the angles between the spanwise multi-stage bifurcated cooling channels and the first spanwise primary cooling channels and the second spanwise primary cooling channels, so that the spanwise multi-stage bifurcated cooling channels, the flowwise multi-stage bifurcated cooling channels, and the tandem cooling channels can cover irregular areas. This allows for flexible adjustment of the cooling channel arrangement and improves the cooling efficiency of the blade under uneven heat loads.

[0020] 3. The present invention adopts adjustable span-wise arranged multi-stage bifurcated cooling pipes, flow-wise arranged multi-stage bifurcated cooling pipes and serial cooling pipes, which can be set, for example, on the pressure surface, suction surface, leading edge and trailing edge, so that the cooling pipes can be flexibly arranged, and the cooling pipes can be set at a higher density in areas with high heat load, so that the temperature of the outer wall can be more uniform.

[0021] 4. The present invention adopts a cooling pipe outlet structure, so that the cooling medium can form a cooling air film on the outer wall after flowing out of the cooling pipe, preventing the high-temperature mainstream from directly contacting the outer wall, thereby improving the thermal protection effect of the turbine cooling blades. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Other features, objects and advantages of the present invention will become more apparent upon reading the detailed description of non-limiting embodiments with reference to the following drawings:

[0023] FIG1 is a schematic structural diagram of a turbine cooling blade according to the present invention;

[0024] FIG2 is a schematic structural diagram of a spanwise arranged multi-stage bifurcated cooling pipe according to the present invention;

[0025] FIG3 is a schematic structural diagram of a multi-stage bifurcated cooling pipe arranged in a flow direction according to the present invention;

[0026] FIG4 is a schematic structural diagram of the serial cooling pipeline of the present invention.

[0027] In which: Turbine cooling blade 1 cooling channel inlet 111 outer wall 10 span-wise main cooling channel 121 inner wall 11 first span-wise primary cooling channel 122 span-wise multi-stage bifurcated cooling channel 12 second span-wise primary cooling channel 123 flow-wise multi-stage bifurcated cooling channel 13 span-wise secondary cooling channel 124 series cooling channel 14 span-wise tertiary cooling channel 125 pressure surface 101 flow to main cooling channel 131 suction surface 102 first flow to primary cooling channel 132 leading edge 103 second flow to primary cooling channel 133 trailing edge 104 flow to secondary cooling channel 134 cooling channel outlet 105 flow to tertiary cooling channel 135 periodic series cooling channel 141 DETAILED DESCRIPTION

[0028] The present invention will be described in detail below with reference to specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those skilled in the art, several changes and improvements can be made without departing from the scope of the present invention. These all fall within the scope of protection of the present invention.

[0029] Example 1:

[0030] According to the present invention, a turbine blade with a bifurcated cooling pipe and a serial cooling pipe is provided, comprising a turbine cooling blade 1; the turbine cooling blade 1 comprises an outer wall 10, an inner cavity, an inner wall 11, a span-wise arranged multi-stage bifurcated cooling pipe 12, a flow-wise arranged multi-stage bifurcated cooling pipe 13 and a serial cooling pipe 14; the inner cavity is arranged in the outer wall 10; the inner wall 11 is arranged in the inner cavity; the span-wise arranged multi-stage bifurcated cooling pipe 12 is connected to the outer wall 10, and the span-wise arranged multi-stage bifurcated cooling pipe 12, the flow-wise arranged multi-stage bifurcated cooling pipe 13 and the serial cooling pipe 14 are connected to the inner wall 11 and the outer wall 10; the span-wise arranged multi-stage bifurcated cooling pipe 12, the flow-wise arranged multi-stage bifurcated cooling pipe 13 and the serial cooling pipe 14 are arranged on the turbine cooling blade 1.

[0031] The outer wall 10 includes a pressure surface 101, a suction surface 102, a leading edge 103 and a trailing edge 104; the spanwise arranged multi-stage bifurcated cooling pipe 12, the flowwise arranged multi-stage bifurcated cooling pipe 13 and the serial cooling pipe 14 can be arranged on the turbine cooling blade 1 at the same time, or only one or two of them are arranged on the turbine cooling blade 1; the spanwise arranged multi-stage bifurcated cooling pipe 12 is set at the leading edge 103 position, and the spanwise arranged multi-stage bifurcated cooling pipe 12 includes a cooling pipe inlet 111 and a cooling pipe outlet 105, The span-wise arranged multi-stage bifurcated cooling pipe 12 also includes multiple bifurcated structures; the flow-wise arranged multi-stage bifurcated cooling pipe 13 is arranged at the pressure surface 101 and the suction surface 102, and the flow-wise arranged multi-stage bifurcated cooling pipe 13 includes a cooling pipe inlet 111 and a cooling pipe outlet 105, and the flow-wise arranged multi-stage bifurcated cooling pipe 13 also includes multiple bifurcated structures; the serial cooling pipe 14 includes a cooling pipe inlet 111 and a cooling pipe outlet 105, and the serial cooling pipe 14 also includes multiple bifurcated structures.

[0032] The inner cavity is filled with cooling medium, which flows from the cooling channel inlet 111 on the inner wall 11 into the span-wise arranged multi-stage bifurcated cooling channel 12, the flow-wise arranged multi-stage bifurcated cooling channel 13 and the serial cooling channel 14, and flows out from the cooling channel outlet 105 on the outer wall 10.

[0033] The spanwise multi-stage bifurcated cooling pipe 12 includes a spanwise main cooling pipe 121 and a spanwise multi-stage cooling pipe. 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 each time a branch is passed. 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 not less than two pipes. The spanwise multi-stage cooling pipes of the same stage can have different diameters. The spacing between the spanwise multi-stage cooling pipes of the same stage and the spanwise multi-stage cooling pipes of the previous stage is not less than one. The angles may not be equal; between two adjacent spanwise multi-stage cooling pipes, the diameter of the spanwise multi-stage cooling pipe of the next level is not greater than the diameter of the spanwise multi-stage cooling pipe of the previous level; the angle between the spanwise main cooling pipe 121 and the spanwise first-level cooling pipe is between 60° and 90°, and except for the spanwise main cooling pipe 121, the angle between each spanwise multi-stage cooling pipe and the spanwise multi-stage cooling pipe of the next level is between 0° and 70°; the spanwise arranged multi-stage bifurcated cooling pipe 12 also includes at least one cooling pipe inlet 111 and at least two cooling pipe outlets 105.

[0034] The cooling pipe outlets 105 of the spanwise arranged multi-stage bifurcated cooling pipes 12 are distributed in an arc shape near the leading edge 103; the cooling medium will form a cooling air film after flowing out of the cooling pipe outlets 105, and the cooling medium will flow along the outer wall 10; the cooling pipe outlets 105 of the spanwise arranged multi-stage bifurcated cooling pipes 12 and the cooling pipe outlets 105 of the spanwise adjacent multi-stage bifurcated cooling pipes 12 have appropriate relative positions so that the cooling air films formed by the two do not overlap; the cooling pipe length corresponding to each cooling pipe outlet 105 of the spanwise 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.

[0035] The multi-stage bifurcated cooling pipe 13 arranged in a flow direction includes a main cooling pipe 131 and a multi-stage cooling pipe. The number of stages of the multi-stage cooling pipe 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 pipe increases by one each time a branch is passed, and the number of stages of the multi-stage cooling pipe is not less than one. Each stage of the multi-stage cooling pipe includes no less than two pipes. The multi-stage cooling pipes of the same stage can have different diameters, and the angles between the multi-stage cooling pipes of the same stage and the multi-stage cooling pipes of the previous stage can be unequal. Between the multi-stage cooling pipes of two adjacent stages, the multi-stage cooling pipes of the next stage are equal. The diameter is not greater than the diameter of the multi-stage cooling pipe of the previous level; the angle between the multi-stage cooling pipes of two adjacent levels is between 0° and 70°; the multi-stage bifurcated cooling pipe 13 arranged in the flow direction also 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 bifurcated cooling pipe 13 arranged in the flow direction are distributed on the outer wall 10 in an arc shape; the cooling medium will form a cooling air film after flowing out of the cooling pipe outlet 105; the cooling pipe length corresponding to each cooling pipe outlet 105 of the multi-stage bifurcated cooling pipe 13 arranged in the flow direction 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.

[0036] The serial cooling pipe 14 includes no less than two periodic serial cooling pipes 141, and the shapes of the periodic serial cooling pipes 141 include but are not limited to hexagons, triangles, quadrilaterals, and octagons; the periodic serial cooling pipes 141 are similar in shape, and the diameters of different periodic serial cooling pipes 141 can be different; the cooling medium is allowed to branch and merge in the serial cooling pipe 14, and multiple serial cooling pipes can be connected to each other; the serial cooling pipe 14 can be arranged along the contour of the outer wall, and the serial cooling pipe 14 can be arranged in a curved surface with equal or variable spacing with the outer wall; the serial cooling pipe 14 can be set to an irregular shape, so as to effectively cool the blade according to the heat load distribution of the turbine cooling blade 1; the serial cooling pipe 14 also includes no less than one cooling pipe inlet 111 and no less than two cooling pipe outlets 105; the cooling medium will form a cooling air film after flowing out of the cooling pipe outlet 105; the cooling pipe length corresponding to each cooling pipe outlet 105 of the serial cooling pipe 14 should be greater than five times the outlet diameter.

[0037] The spanwise arranged multi-stage bifurcated cooling pipes 12 do not intersect with the adjacent spanwise arranged multi-stage bifurcated cooling pipes 12 in space, but the projections of the two on the normal direction of the outer wall 10 overlap to form a good internal cooling effect; multiple spanwise arranged multi-stage bifurcated cooling pipes 12 are arranged along the span direction at the leading edge of the blade, and in the direction along the inner normal of the outer wall 10, the bifurcation positions of the adjacent spanwise arranged multi-stage bifurcated cooling pipes 12 and the air films formed by the cooling pipe outlets 105 do not overlap, and the air films formed by the cooling pipe outlets 105 of the adjacent spanwise arranged multi-stage bifurcated cooling pipes 12 do not overlap.

[0038] The flow-direction-arranged multi-stage bifurcated cooling pipes 13 and the serial cooling pipes 14 can be set at any position of the turbine cooling blade 1, including the pressure surface 101, the suction surface 102, the leading edge 103 and the trailing edge 104, and multiple flow-direction-arranged multi-stage bifurcated cooling pipes 13 and serial cooling pipes 14 or a combination of the two are set at the said positions; the combination of multiple flow-direction-arranged multi-stage bifurcated cooling pipes 13 includes array, staggered and combination according to other rules; the flow-direction-arranged multi-stage bifurcated cooling pipes 13 do not intersect with the adjacent flow-direction-arranged multi-stage bifurcated cooling pipes 13 in space, and the projections of the two on the outer wall normal do not overlap or have partial overlap, and the combination of multiple flow-direction-arranged multi-stage bifurcated cooling pipes 13 covers the outer wall 10 of the blade; the air film formed by the cooling pipe outlet 105 does not overlap; in areas with high heat load, the density of the pipes in the combination of multiple flow-direction-arranged multi-stage bifurcated cooling pipes 13 and serial cooling pipes 14 should be greater than in areas with low heat load.

[0039] The serial cooling pipes 14 are arranged at positions close to the trailing edge 104 on the pressure surface 101 and at positions close to the trailing edge 104 on the suction surface 102. At these positions, the periodic serial cooling pipes 141 in the serial cooling pipes 14 can cover a larger area than the spanwise arranged multi-stage branched cooling pipes 12 and the flowwise arranged multi-stage branched cooling pipes 13 and their combination.

[0040] Example 2:

[0041] A span-wise arranged multi-stage bifurcated cooling pipe 12, a flow-wise arranged multi-stage bifurcated cooling pipe 13, and a serial cooling pipe 14 are arranged inside the turbine blade, so that the cooling medium flows from the inside of the blade through the cooling pipe 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, a cooling air film is formed to prevent the high-temperature mainstream from directly contacting the outer wall 10.

[0042] The present invention discloses a turbine cooling blade 1, which includes an outer wall 10, which includes 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), which is surrounded by the outer wall 10 and has an inner wall 11. The turbine cooling blade 1 also includes at least one spanwise multi-stage bifurcated cooling duct 12, a flowwise multi-stage bifurcated cooling duct 13, and a serial cooling duct 14. The spanwise multi-stage bifurcated cooling duct 12 is arranged at the leading edge 103 and includes a cooling duct inlet 111 and a cooling duct outlet 105. The spanwise multi-stage bifurcated cooling duct 12 also includes multiple bifurcated structures, so that the cooling medium forms a flow state that is divided into two multiple times in the spanwise multi-stage bifurcated cooling duct 12. The multi-stage bifurcated cooling duct 13 is arranged at the pressure surface 101 and the suction surface 102, and includes a cooling duct inlet 111 and a cooling duct outlet 105. The multi-stage bifurcated cooling duct 13 also includes multiple bifurcated structures, allowing the cooling medium to form multiple bifurcated flow states in the multi-stage bifurcated cooling duct 13. The serial cooling duct 14 includes a cooling duct inlet 111 and a cooling duct outlet 105. The serial cooling duct 14 also includes multiple bifurcated structures, allowing the cooling medium to form multiple bifurcated and merged flow states at different bifurcated structures in the serial cooling duct 14.

[0043] The inner cavity of the turbine cooling blade 1 is filled with cooling medium, which flows from the cooling channel inlet 111 on the inner wall 11 into the span-wise arranged multi-stage bifurcated cooling channel 12, flows into the directional arranged multi-stage bifurcated cooling channel 13 and the serial cooling channel 14, and flows out from the cooling channel outlet 105 on the outer wall 10.

[0044] The spanwise multi-stage bifurcated cooling pipes 12 include a spanwise main cooling pipe 121 and spanwise multi-stage cooling pipes. The number of spanwise multi-stage cooling pipes depends on the number of bifurcations in a complete pipe. Starting from the spanwise main cooling pipe 121 (which can be considered the spanwise zero-stage cooling pipe), the number of spanwise multi-stage cooling pipes increases by one with each bifurcation, and the number of spanwise multi-stage cooling pipes is no less than one. Each level of spanwise multi-stage cooling pipes includes no fewer than two pipes, for example, a first spanwise first-stage cooling pipe 122 and a second spanwise first-stage cooling pipe 123. Spanwise multi-stage cooling pipes of the same level can have different diameters, and the angle between the spanwise multi-stage cooling pipe of the same level and the spanwise multi-stage cooling pipe of the previous level can be unequal. Between two adjacent spanwise multi-stage cooling pipes, the diameter of the spanwise multi-stage cooling pipe of the next level is no greater than the diameter of the spanwise multi-stage cooling pipe of the previous level. The angle between the spanwise main cooling duct 121 and the spanwise first-stage cooling duct is between 60° and 90° with respect to the flow direction vector. Except for the spanwise main cooling duct 121, the angle between each spanwise multi-stage cooling duct and the next spanwise multi-stage cooling duct is between 0° and 70°. The spanwise multi-stage bifurcated cooling duct 12 also includes at least one cooling duct inlet 111 and at least two cooling duct outlets 105. Preferably, the cooling duct outlets 105 of the spanwise multi-stage bifurcated cooling duct 12 are distributed in an arc shape near the leading edge 10. It is anticipated that the cooling medium will form a cooling air film after flowing out of the cooling duct outlet 105. In other words, the cooling medium will flow close to the outer wall 10 after flowing out of the cooling duct outlet 105, preventing the outer wall 10 from directly contacting the high-temperature mainstream. The cooling pipe length corresponding to each cooling pipe outlet 105 of the spanwise arranged multi-stage bifurcated cooling pipes 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 .

[0045] The multi-stage bifurcated cooling pipes 13 are arranged in a flow direction, including 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 in a complete pipe. Starting from the main cooling pipe 131 (which can be considered as the zero-stage cooling pipe), the number of stages of the multi-stage cooling pipes increases by one with each branch, and the number of stages of the multi-stage cooling pipes is no less than one. Each stage of the multi-stage cooling pipes includes no fewer than two pipes, for example, a first-stage cooling channel 132 and a second-stage cooling channel 133. Multi-stage cooling pipes in the same stage can have different diameters, and the angle between the same stage and the previous stage can be unequal. Between two adjacent stages of multi-stage cooling pipes, the diameter of the next stage of the multi-stage cooling pipe is no greater than the diameter of the previous stage of the multi-stage cooling pipe. The angle between two adjacent stages of the multi-stage cooling pipes, measured by the angle of the flow direction vector, is between 0° and 70°. The multi-stage bifurcated cooling ducts 13 arranged in a flow direction further include at least one cooling duct inlet 111 and at least two cooling duct outlets 105. Preferably, the cooling duct outlets 105 of the multi-stage bifurcated cooling ducts 13 are distributed in an arc shape on the outer wall 10. It is anticipated that the cooling medium will form a cooling air film after flowing out of the cooling duct outlets 105. The cooling duct length corresponding to each cooling duct outlet 105 of the multi-stage bifurcated cooling ducts 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.

[0046] The serial cooling pipe 14 includes no less than 2 periodic serial pipes 141, and the shapes of the periodic serial pipes 141 include but are not limited to hexagons, octagons, rings, etc. The periodic serial pipes 141 are similar in shape, and the diameters of different pipes may be different. The cooling fluid is allowed to branch and merge in the serial cooling pipe 14, and multiple serial cooling pipes 14 can be connected to each other. Preferably, the serial cooling pipe 14 can be arranged along the contour of the outer wall 10. In other words, the serial cooling pipe 14 can be arranged in a curved surface with equal spacing or variable spacing with the outer wall 10. Preferably, the serial cooling pipe 14 can be arranged in an irregular shape so as to effectively cool the blade according to the heat load distribution of the turbine cooling blade 1. The serial cooling pipe 14 also includes no less than 1 cooling pipe inlet 111 and no less than 2 cooling pipe outlets 105. It can be expected that the cooling medium will form a cooling air film after flowing out of the cooling pipe outlet 105. The cooling pipe length corresponding to each cooling pipe outlet 105 of the serial cooling pipe 14 should be greater than five times the outlet diameter.

[0047] The spanwise multi-stage bifurcated cooling ducts 12 do not intersect with the adjacent spanwise multi-stage bifurcated cooling ducts 12 in space, but the projections of the two on the normal direction of the outer wall 10 overlap to form a good internal cooling effect; multiple spanwise multi-stage bifurcated cooling ducts 12 are arranged along the span direction on the leading edge 103 of the blade. In the direction along the inner normal of the outer wall 10, the bifurcation positions of the adjacent spanwise multi-stage bifurcated cooling ducts 12 and the air films formed at the cooling duct outlets 105 should avoid overlapping, and the air films formed at the cooling duct outlets 105 of the adjacent spanwise multi-stage bifurcated cooling ducts 12 should avoid overlapping, so as to enhance the uniformity of cooling of the leading edge 103.

[0048] The flow-arranged multi-stage bifurcated cooling pipes 13 and the serial cooling pipes 14 can be set at any position of the turbine cooling blade 1, including the pressure surface 101, the suction surface 102, the leading edge 103 and the trailing edge 104. Multiple flow-arranged multi-stage bifurcated cooling pipes 13 or serial cooling pipes 14 and a combination of the two can be set at the said positions. The combination of multiple flow-directionally arranged multi-stage bifurcated cooling pipes 13 includes arrays, staggered combinations and combinations according to other rules. The flow-directional multi-stage bifurcated cooling pipes 13 do not intersect with the adjacent flow-directional multi-stage bifurcated cooling pipes 13 in space, and the projections of the two on the normal direction of the outer wall 11 do not overlap or have partial overlap. The combination of multiple flow-directionally arranged multi-stage bifurcated cooling pipes 13 should cover the outer wall 10 of the blade as completely as possible, and the air film formed by the cooling pipe outlet 105 of the flow-directional multi-stage bifurcated cooling pipe 13 should avoid overlapping, so as to improve the uniformity of the cooling effect; in areas with high heat load, the density of the pipes in the combination 14 of multiple flow-directionally arranged multi-stage bifurcated cooling pipes 13 and serial cooling pipes should be greater than in areas with low heat load, and a larger cooling pipe diameter can also be used to enhance the cooling effect.

[0049] The serial cooling ducts 14 are arranged near the trailing edge 104 on the pressure side 101 and near the trailing edge 104 on the suction side 102. The periodic serial ducts 141 within the serial cooling ducts 14 can cover a larger area than the spanwise-arranged multi-stage bifurcated cooling ducts 12, the flowwise-arranged multi-stage bifurcated cooling ducts 13, and their combination, thereby adequately cooling these locations. Multiple, non-connected serial cooling ducts 14 can be arranged at the aforementioned locations. The projections of the multiple serial cooling ducts 14 in the normal direction of the outer wall 11 may not overlap or may partially overlap. The air films formed by the cooling duct outlets 105 of the multiple serial cooling ducts 14 may overlap.

[0050] Those skilled in the art may understand this embodiment as a more specific description of Embodiment 1.

[0051] In the description of this application, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and 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, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0052] The above describes specific embodiments of the present invention. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art may make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. The embodiments of this application and the features in the embodiments may be combined with each other in any manner unless there is a conflict.

Claims

1. A turbine blade having a bifurcated cooling channel and a tandem cooling channel, characterized in that: The invention comprises a turbine cooling blade (1); the turbine cooling blade (1) comprises an outer wall (10), an inner cavity, an inner wall (11), a multi-stage bifurcated cooling pipeline (12) arranged in a span direction, a multi-stage bifurcated cooling pipeline (13) arranged in a flow direction, and a series cooling pipeline (14); The inner cavity is arranged in the outer wall (10); the inner wall (11) is arranged in the inner cavity; the spanwise arranged multi-stage branched cooling pipe (12) is connected to the outer wall (10); the spanwise arranged multi-stage branched cooling pipe (12), the flowwise arranged multi-stage branched cooling pipe (13) and the series cooling pipe (14) are connected to the inner wall (11) and the outer wall (10); the spanwise arranged multi-stage branched cooling pipe (12), the flowwise arranged multi-stage branched cooling pipe (13) and the series cooling pipe (14) are arranged on the turbine cooling blade (1).

2. The turbine blade with bifurcated cooling channels and tandem cooling channels according to claim 1, characterized in that: The outer wall (10) comprises a pressure surface (101), a suction surface (102), a leading edge (103) and a trailing edge (104); the spanwise arranged multi-stage bifurcated cooling pipeline (12), the flowwise arranged multi-stage bifurcated cooling pipeline (13) and the serial cooling pipeline (14) can be arranged on the turbine cooling blade (1) at the same time, or only one or two of them can be arranged on the turbine cooling blade (1); the spanwise arranged multi-stage bifurcated cooling pipeline (12) is arranged at the leading edge (103), and the spanwise arranged multi-stage bifurcated cooling pipeline (12) comprises a cooling pipeline inlet (111) and a cooling pipeline outlet (104). 5), the span-wise arranged multi-stage bifurcated cooling pipeline (12) further comprises a plurality of bifurcated structures; the flow-wise arranged multi-stage bifurcated cooling pipeline (13) is arranged at the pressure surface (101) and the suction surface (102), the flow-wise arranged multi-stage bifurcated cooling pipeline (13) comprises a cooling pipeline inlet (111) and a cooling pipeline outlet (105), and the flow-wise arranged multi-stage bifurcated cooling pipeline (13) further comprises a plurality of bifurcated structures; the series cooling pipeline (14) comprises a cooling pipeline inlet (111) and a cooling pipeline outlet (105), and the series cooling pipeline (14) further comprises a plurality of bifurcated structures.

3. The turbine blade with bifurcated cooling channels and tandem cooling channels according to claim 1, characterized in that: The inner cavity is filled with cooling medium, which flows from a cooling channel inlet (111) on the inner wall (11) into a span-wise arranged multi-stage branched cooling channel (12), a flow-wise arranged multi-stage branched cooling channel (13) and a series cooling channel (14), and flows out from a cooling channel outlet (105) on the outer wall (10).

4. The turbine blade with bifurcated cooling channels and tandem cooling channels according to claim 1, characterized in that: The spanwise arranged multi-stage bifurcated cooling pipeline (12) comprises a spanwise main cooling pipeline (121) and a spanwise multi-stage cooling pipeline. The number of stages of the spanwise multi-stage cooling pipeline depends on the number of branches on a complete pipeline. Starting from the spanwise main cooling pipeline (121), the number of stages of the spanwise multi-stage cooling pipeline increases by one after each branch. The number of stages of the spanwise multi-stage cooling pipeline is not less than one. Each stage of the spanwise multi-stage cooling pipeline comprises no less than two pipelines. The spanwise multi-stage cooling pipelines of the same stage can have different diameters. The angle between the spanwise multi-stage cooling pipeline of the same stage and the spanwise multi-stage cooling pipeline of the previous stage is can be unequal; between two adjacent levels of spanwise multi-stage cooling pipes, the diameter of the next level of spanwise multi-stage cooling pipe is not greater than the diameter of the previous level of spanwise multi-stage cooling pipe; the included angle between the spanwise main cooling pipe (121) and the spanwise first level 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 arranged multi-stage bifurcated cooling pipe (12) further comprises at least one cooling pipe inlet (111) and at least two cooling pipe outlets (105).

5. The turbine blade with bifurcated cooling channels and tandem cooling channels according to claim 4, characterized in that: The cooling channel outlets (105) of the spanwise arranged multi-stage bifurcated cooling channel (12) are distributed in an arc shape near the leading edge (103); a cooling air film is formed after the cooling medium flows out from the cooling channel outlets (105), and the cooling medium flows along the outer wall (10); there is an appropriate relative position between the cooling channel outlets (105) of the spanwise arranged multi-stage bifurcated cooling channel (12) and the cooling channel outlets (105) of the spanwise arranged multi-stage bifurcated cooling channel (12) adjacent to the spanwise arrangement, so that the cooling air films formed by the two do not overlap; the cooling channel length corresponding to each cooling channel outlet (105) of the spanwise arranged multi-stage bifurcated cooling channel (12) should be greater than 1.5 times the distance between the outer wall and the inner wall at the leading edge.

6. The turbine blade with bifurcated cooling channels and tandem cooling channels according to claim 1, characterized in that: The multi-stage bifurcated cooling pipe (13) arranged in a flow direction comprises a main cooling pipe (131) and a multi-stage cooling pipe. The number of stages of the multi-stage cooling pipe 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 pipe increases by one after each branch. The number of stages of the multi-stage cooling pipe is not less than one. Each stage of the multi-stage cooling pipe comprises no less than two pipes. The multi-stage cooling pipes of the same stage can have different diameters. The angle between the multi-stage cooling pipes of the same stage and the multi-stage cooling pipes of the previous stage can be unequal. Between two adjacent multi-stage cooling pipes of the flow direction, the diameter of the multi-stage cooling pipe of the next stage is not greater than The diameter of the previous stage flow multi-stage cooling pipeline; the angle between the flow multi-stage cooling pipelines of two adjacent stages is between 0° and 70°; the flow-arranged multi-stage bifurcated cooling pipeline (13) further comprises at least one cooling pipeline inlet (111) and at least two cooling pipeline outlets (105); the cooling pipeline outlets (105) of the flow-arranged multi-stage bifurcated cooling pipeline (13) are distributed on the outer wall (10) in an arc shape; the cooling medium forms a cooling air film after flowing out of the cooling pipeline outlet (105); the cooling pipeline length corresponding to each cooling pipeline outlet (105) of the flow-arranged multi-stage bifurcated cooling pipeline (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.

7. The turbine blade with bifurcated cooling channels and tandem cooling channels according to claim 1, characterized in that: The serial cooling pipeline (14) comprises no less than two periodic serial cooling pipelines (141), and the shapes of the periodic serial cooling pipelines (141) include but are not limited to hexagons, triangles, quadrilaterals, and octagons; the periodic serial cooling pipelines (141) are similar in shape, and the diameters of different periodic serial cooling pipelines (141) can be different; the cooling medium is allowed to branch and merge in the serial cooling pipeline (14), and a plurality of serial cooling pipelines can be connected to each other (14); the serial cooling pipeline (14) can be arranged along the contour of the outer wall, and the serial cooling pipeline (14) can be connected to the outer wall of the serial cooling pipeline (14); The cooling pipe (14) can be arranged in a curved surface with equal or variable spacing from the outer wall; the serial cooling pipe (14) can be arranged in an irregular shape, so as to effectively cool the blade according to the heat load distribution of the turbine cooling blade (1); the serial cooling pipe (14) also includes at least one cooling pipe inlet (111) and at least two cooling pipe outlets (105); the cooling medium will form a cooling air film after flowing out of the cooling pipe outlet (105); the cooling pipe length corresponding to each cooling pipe outlet (105) of the serial cooling pipe (14) should be greater than five times the outlet diameter.

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

9. [Corrected 27.05.2024 in accordance with Rule 26] A turbine blade with bifurcated cooling ducts and tandem cooling ducts according to claim 1, characterized in that: The multi-stage bifurcated cooling pipes (13) and the series cooling pipes (14) arranged in a flow direction can be arranged at any position of the turbine cooling blade (1), including the pressure surface (101), the suction surface (102), the leading edge (103) and the trailing edge (104), and a plurality of multi-stage bifurcated cooling pipes (13) and the series cooling pipes (14) or a combination of the two are arranged at the positions; the combination of the plurality of multi-stage bifurcated cooling pipes (13) arranged in a flow direction includes an array, a staggered arrangement and a combination according to other rules; the flow direction arrangement The multi-stage bifurcated cooling pipe (13) and the adjacent multi-stage bifurcated cooling pipe (13) arranged in the flow direction do not intersect in space, and the projections of the two in the normal direction of the outer wall do not overlap or partially overlap. The combination of multiple multi-stage bifurcated cooling pipes (13) arranged in the flow direction covers the outer wall (10) of the blade; the air film formed by the cooling pipe outlet (105) does not overlap; in the area with high heat load, the density of the pipes in the combination of multiple multi-stage bifurcated cooling pipes (13) arranged in the flow direction and the series cooling pipe (14) should be greater than that in the area with low heat load.

10. The turbine blade having bifurcated cooling channels and tandem cooling channels according to claim 1, characterized in that: The serial cooling pipes (14) are arranged at positions close to the trailing edge (104) of the pressure surface (101) and at positions close to the trailing edge (104) of the suction surface (102). At these positions, the periodic serial cooling pipes (141) in the serial cooling pipes (14) can cover a larger area than the spanwise-arranged multi-stage branched cooling pipes (12) and the flowwise-arranged multi-stage branched cooling pipes (13) and their combination.

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