Blade with semi-split cooling structure and engine

Abstract

The application provides a vane with a semi-split cooling structure and an engine, and relates to the technical field of turbine vane of an aero-engine. The vane comprises a vane body, a cold air cavity and a split. The air inlet of the split is communicated with the cold air cavity, the air outlet of the split is formed on the pressure surface of the vane body and communicated with the outside, the split is adjacent to the trailing edge of the vane body and provided with a partition rib, the partition rib is at least one and separates the split into at least two cold air flow channels, all the cold air flow channels are arranged in a spaced manner along a first direction, the first direction is the height direction of the vane body, the cold air flow channels extend along a second direction, and the second direction is at an angle with the first direction. The cross-sectional area of the part of the cold air flow channel adjacent to the air inlet of the split gradually decreases in the direction from the air inlet of the split to the air outlet. The application can reduce the flow resistance in the cold air flow channel and improve the smoothness of the cold air entering the cold air flow channel.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of turbine blades of an aero-engine, and in particular to a blade with a semi-split cooling structure and an engine. BACKGROUND

[0002] An important way to improve the power performance of an aero-engine is to increase the temperature of the gas before the turbine. The temperature before the turbine of some advanced aero-engines at the present stage has reached 2000K, which is much higher than the temperature limit that the turbine blade material can withstand. Therefore, an efficient cooling method must be used to cool each key part of the turbine blade. Among them, the blade trailing edge is the weakest part of the blade and is most prone to blade ablation and fracture accidents, so an effective cooling structure needs to be designed for the blade trailing edge part.

[0003] The most commonly used method in the related art is to design a semi-split film cooling structure on the blade trailing edge. The principle of the semi-split film cooling structure is to cut part of the wall surface on the pressure side of the blade trailing edge, introduce the cold gas in the internal passage of the blade to the cut wall surface to form a cooling gas film, thereby isolating the blade trailing edge and the high-temperature main stream gas, avoiding direct contact between the two, and achieving cooling and protection of the blade trailing edge part. However, the foregoing trailing edge semi-split film cooling structure still has the following problems in actual use:

[0004] 1. The internal cold gas passage of the horizontal exhaust type trailing edge split has large flow resistance;

[0005] 2. The rib plate between the cold gas passages can cause uneven distribution of the gas film in the downstream area of the blade;

[0006] 3. Uneven mixing of the cold gas and the main stream gas can also affect the uniformity of the airflow entering the downstream blade. SUMMARY

[0007] The present application aims to at least partially solve one of the technical problems in the related art.

[0008] To this end, an embodiment of one aspect of the present application proposes a blade with a semi-split cooling structure, which can reduce the flow resistance in the cold gas flow passage and improve the smoothness of the cold gas entering the cold gas flow passage.

[0009] An embodiment of another aspect of the present application proposes an engine.

[0010] According to the vane with the semi-split cooling structure, the split and the separation rib in the split are matched to form at least two cold air flow channels arranged along the height direction of the vane body, so that the cold air in the cold air cavity can flow into the cold air flow channels through the air inlet of the split and be led out to the trailing edge of the vane body through the air outlet of the split, and a cooling air film is formed on the pressure surface of the vane body to isolate the trailing edge of the vane body and the high-temperature main stream of the gas, so that the trailing edge of the vane body is cooled and protected, and the cross-sectional area of the part of the cold air flow channel adjacent to the air inlet of the split gradually decreases along the direction from the air inlet to the air outlet, that is, the caliber of at least part of the cold air flow channel gradually decreases from the air inlet to the air outlet, so that the step flow degree of the leeward side of the separation rib is weakened, the dramatic change of the cold air flow rate is avoided, the cold air can smoothly enter the cold air flow channel, and compared with the related art, the flow resistance in the cold air flow channel is reduced, and the smoothness of the cold air entering the cold air flow channel is improved.

[0011] According to the vane with the semi-split cooling structure, the split and the separation rib in the split are matched to form at least two cold air flow channels arranged along the height direction of the vane body, so that the cold air in the cold air cavity can flow into the cold air flow channels through the air inlet of the split and be led out to the trailing edge of the vane body through the air outlet of the split, and a cooling air film is formed on the pressure surface of the vane body to isolate the trailing edge of the vane body and the high-temperature main stream of the gas, so that the trailing edge of the vane body is cooled and protected, and the cross-sectional area of the part of the cold air flow channel adjacent to the air inlet of the split gradually decreases along the direction from the air inlet to the air outlet, that is, the caliber of at least part of the cold air flow channel gradually decreases from the air inlet to the air outlet, so that the step flow degree of the leeward side of the separation rib is weakened, the dramatic change of the cold air flow rate is avoided, the cold air can smoothly enter the cold air flow channel, and compared with the related art, the flow resistance in the cold air flow channel is reduced, and the smoothness of the cold air entering the cold air flow channel is improved.

[0012] In some embodiments, the cold air flow channel comprises a first wall surface and a second wall surface oppositely arranged along the first direction, and the first wall surface and the second wall surface each have a first section, an intermediate section and a second section sequentially connected along the second direction;

[0013] The end of the first section of each of the first wall surface and the second wall surface away from the intermediate section is connected to the inner wall surface of the cold air cavity, and the spacing between the first section of the first wall surface and the first section of the second wall surface gradually decreases along the direction from the air inlet to the air outlet of the split.

[0014] In some embodiments, the first wall surface and the second wall surface are mirror-symmetric with respect to a reference surface, and the reference surface is perpendicular to the first direction.

[0015] In some embodiments, on the projection surface perpendicular to the third direction, the width of the projection contour line of the inlet of the cold air flow duct is B, and the contraction amplitude of the first segment of each of the first wall surface and the second wall surface is defined as α, and the contraction amplitude is the difference between the projection of the corresponding first segment and the projection of the reference plane at the longest spacing and the shortest spacing, 0.075B≤α≤0.125B, wherein the third direction is perpendicular to both the first direction and the second direction.

[0016] In some embodiments, the length of the cold air flow channel is L, the length of the projection contour line of the first section of each of the first wall and the second wall on the reference plane is a spanwise length β, and 0.3L≤β≤0.4L.

[0017] In some embodiments, on the projection surface perpendicular to the third direction, the projection contour line of the middle section of each of the first wall surface and the second wall surface is a first wave line extending along the second direction, and the amplitude of the first wave line is A1, 0.1B≤A1≤0.15B.

[0018] In some embodiments, the wavelength of the first wave line is l1, 0.2L≤l1≤0.25L.

[0019] In some embodiments, the length of the projection contour line of the middle section of each of the first wall and the second wall on the reference plane is a spanwise length γ, and 0.45L≤γ≤0.55L.

[0020] In some embodiments, the end of the second section of each of the first wall and the second wall facing away from the middle section is connected to the air outlet of the slit, and the distance between the second section of the first wall and the second section of the second wall gradually increases in the direction from the air inlet of the slit toward the air outlet.

[0021] In some embodiments, on the projection surface perpendicular to the third direction, the expansion amplitude of the second segment of each of the first wall surface and the second wall surface is defined as λ, and the expansion amplitude is the difference between the projection of the corresponding second segment and the projection of the reference plane at the longest spacing and the shortest spacing, 0.1B≤λ≤0.15B.

[0022] In some embodiments, the length of the second segment of each of the first wall and the second wall is s, 0.1L≤s≤0.15L.

[0023] In some embodiments, the cold air flow channel further includes a third wall surface, the third wall surface is opposite to the third direction and is located between the first wall surface and the second wall surface, and the third wall surface is connected to the inner wall surface of the cold air cavity and the air outlet of the slit;

[0024] In a projection plane perpendicular to the first direction, a projection profile line of the third wall surface is a second wavy line extending along the second direction, a wave amplitude of the second wavy line is A2, and 0.175B≤A2≤0.225B.

[0025] In some embodiments, a wave length of the second wavy line is l2, and 0.225B≤l2≤0.275B.

[0026] In some embodiments, the pressure surface and the suction surface of the blade body form a trailing edge extending along the first direction at a connection of the trailing edge, a height of the blade body is H, and in a projection plane perpendicular to the third direction, a projection profile line of the trailing edge is a third wavy line extending along the first direction, a wave amplitude of the third wavy line is A3, and 0.05H≤A3≤0.1H.

[0027] In some embodiments, a wave length of the third wavy line is l3, and 0.15H≤l3≤0.2H.

[0028] An engine according to an embodiment of the present application comprises the blade according to any one of the above embodiments.

[0029] The engine according to the embodiment of the present application has the same technical advantages as the blade described above, and thus the description is not repeated here.

[0030] Additional aspects and advantages of the present application will be given in part in the following description, become apparent from the following description, or be learned by practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 is a structural schematic view of a blade with a half-split cooling structure according to an embodiment of the present application.

[0032] Figure 2 is a structural schematic view of a blade with a half-split cooling structure according to an embodiment of the present application. Figure 1 is a sectional structural schematic view of

[0033] Figure 3 is a structural schematic view of a partition rib and a cold air flow channel part in a blade with a half-split cooling structure according to an embodiment of the present application.

[0034] Figure 4 is a sectional structural schematic view of Figure 3 Figure 1 .

[0035] Figure 5 is a sectional structural schematic view of Figure 3 Figure 2 .

[0036] REFERENCE SIGNS:

[0037] ​​1. blade body, 11. pressure surface, 12. suction surface, 13. trailing edge;

[0038] 2. cold air cavity;

[0039] 3. split gap, 31. air inlet of split gap, 32. air outlet of split gap;

[0040] 4. partition rib;

[0041] 5. cold air flow channel, 51. first wall surface, 52. second wall surface, 53. third wall surface. DETAILED DESCRIPTION

[0042] The embodiments of the present application are described in detail below, examples of which are shown in the accompanying drawings. The embodiments described below by reference to the drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application.

[0043] As shown in the drawings, Figures 1 to 4 A blade with a semi-split gap cooling structure according to an embodiment of the present application comprises a blade body 1, the blade body 1 is provided with a cold air cavity 2 and a split gap 3, the air inlet 31 of the split gap is communicated with the cold air cavity 2, the air outlet 32 of the split gap is formed on the pressure surface 11 of the blade body 1 and communicated with the outside, the split gap 3 is adjacent to the trailing edge of the blade body 1 and provided with a partition rib 4, the partition rib 4 is at least one and separates the split gap 3 into at least two cold air flow channels 5, all the cold air flow channels 5 are arranged in a first direction, the first direction is the height direction of the blade body 1, the cold air flow channels 5 extend in a second direction, the second direction is at an angle with the first direction; the cross-sectional area of the part of the cold air flow channels 5 adjacent to the air inlet 31 of the split gap gradually decreases in the direction from the air inlet 31 to the air outlet 32 of the split gap.

[0044] It can be understood that the blade with a semi-split gap cooling structure according to the embodiment of the present application, by cooperating the split gap 3 on the blade body 1 and the partition rib 4 in the split gap 3, at least two cold air flow channels 5 arranged in the height direction of the blade body 1 can be constructed on the blade body 1, so that the cold air of the cold air cavity 2 can flow into the cold air flow channels 5 through the air inlet 31 of the split gap, and be led out to the trailing edge of the blade body 1 through the air outlet 32 of the split gap, forming a cooling air film on the pressure surface 11 of the blade body 1, isolating the trailing edge of the blade body 1 and the high-temperature main stream gas, achieving cooling protection of the trailing edge part of the blade body 1, and at the same time, because the cross-sectional area of the part of the cold air flow channels 5 adjacent to the air inlet 31 of the split gap gradually decreases in the direction from the air inlet to the air outlet, that is, the caliber of at least part of the cold air flow channels 5 itself gradually decreases from the inlet to the outlet, under the action of this structure, the step flow degree of the leeward side of the partition rib 4 is weakened, so that the dramatic change of the cold air flow rate can be avoided, and the cold air can smoothly enter the cold air flow channels 5, compared with the related art, the present application can reduce the flow resistance in the cold air flow channels 5 and improve the smoothness of the cold air entering the cold air flow channels 5.

[0045] In addition, the inlet of the cold air flow channel 5 is part of the inlet 31 of the split, and the outlet of the cold air flow channel 5 is part of the outlet 32 of the split, in other words, the inlet of the cold air flow channel 5 is located in the inlet 31 of the split, and the outlet of the cold air flow channel 5 is located in the outlet 32 of the split.

[0046] Specifically, the cold air cavity 2 and the split 3 can extend along the first direction. The plurality of partition ribs 4 can separate the split 3 into a plurality of cold air flow channels 5, wherein the plurality of partition ribs 4 can be arranged at equal intervals or unequal intervals along the first direction, and in order to ensure the cooling protection effect of the cooling air film on the blade trailing edge portion and make the air film distribution uniform in the downstream region of the blade (i.e. the part of the blade adjacent to the trailing edge), it is preferred that the plurality of partition ribs 4 are arranged at equal intervals along the first direction, i.e. the plurality of partition ribs 4 are uniformly distributed along the height direction of the blade.

[0047] It should be noted that the cold air cavity 2 can not be limited to being suitable for introducing cooling air, and other working media capable of cooling the blade can also be used, which is not limited here.

[0048] As shown in Figures 3 to 5 In some embodiments, the cold air flow channel 5 includes a first wall surface 51 and a second wall surface 52 oppositely arranged along the first direction, and the first wall surface 51 and the second wall surface 52 each have a first section, an intermediate section and a second section connected in sequence along the second direction.

[0049] The end of the first section of each of the first wall surface 51 and the second wall surface 52 away from the intermediate section is connected to the inner wall surface of the cold air cavity 2, wherein the inner wall surface of the cold air cavity 2 is the inner wall surface of the blade body 1 used to surround the cold air cavity 2. The spacing between the first section of the first wall surface 51 and the first section of the second wall surface 52 gradually decreases along the direction from the inlet 31 of the split to the outlet 32 of the split, i.e. the spacing between the two changes smoothly and gradually decreases along the direction from the inlet to the outlet of the cold air flow channel 5.

[0050] It can be understood that the first section of the first wall surface 51 and the first section of the second wall surface 52 in the cold air flow channel 5 form a tapered portion of the cold air flow channel 5 in the split 3, and the intermediate sections of the two can form an intermediate portion of the cold air flow channel 5 in the split 3, and the tapered portion is in communication with the cold air cavity 2 (i.e. the tapered portion is formed with the inlet of the cold air flow channel 5), and the structure of the tapered portion can weaken the step flow on the leeward side of the partition rib 4 at the inlet of the cold air flow channel 5, avoiding the sharp change of flow rate.

[0051] Specifically, the thickness direction of the partition rib 4 can be consistent with the first direction, at this time, one of the two wall surfaces of the partition rib 4 along the thickness direction thereof can be the first wall surface 51, and the other wall surface can be the second wall surface 52.

[0052] AsFigures 3 to 5 As shown, in some embodiments, the first wall surface 51 and the second wall surface 52 are mirror-symmetrical relative to the reference surface which is perpendicular to the first direction.

[0053] It can be understood that, by designing the first wall surface 51 and the second wall surface 52 of the cold air flow channel 5 to adopt the mirror-symmetrical structure as described above, the processing and forming of the cold air flow channel 5 is facilitated, the production cost is reduced, and the uniformity of the air film distribution in the downstream region of the blade can be further ensured, thereby improving the protection effect on the trailing edge wall surface of the blade.

[0054] Further, in the projection plane perpendicular to the third direction, the width of the projection contour line of the inlet of the cold air flow channel 5 is B, the contraction amplitude of the first section of each of the first wall surface 51 and the second wall surface 52 is defined as a, the contraction amplitude is the difference between the projection of the corresponding first section and the projection of the reference surface at the longest distance and the shortest distance, and 0.075B≤a≤0.125B, wherein the third direction is perpendicular to the first direction and the second direction. That is, along the flow direction of the cold air (or in the direction from the inlet to the outlet of the cold air flow channel 5), the two wall surfaces opposite to each other along the thickness direction of the partition rib 4 gradually converge to the center line direction of the cold air flow channel 5 at the first section.

[0055] In other words, due to the mirror-symmetry of the first wall surface 51 and the second wall surface 52, the contraction amplitude of the first section of each of the first wall surface 51 and the second wall surface 52 is equal, wherein the contraction amplitude is the difference between the projection of the corresponding first section and the projection of the reference surface at the longest distance and the shortest distance, that is, the longest distance between the projection of the first section of the first wall surface 51 (or the first section of the second wall surface 52) and the projection of the reference surface, minus the shortest distance between the projection of the first section of the first wall surface 51 (or the first section of the second wall surface 52) and the projection of the reference surface, that is, the contraction amplitude a.

[0056] Further, the length of the cold air flow channel 5 is L, the length of the projection contour line of the first section of each of the first wall surface 51 and the second wall surface 52 on the reference surface is the spanwise length β, and 0.3L≤β≤0.4L.

[0057] It can be understood that, by designing the contraction amplitude and the spanwise length of the tapered portion within the above ranges, the cold air can smoothly enter the cold air flow channel 5 from the cold air cavity 2, and the flow resistance at the inlet of the cold air flow channel 5 is reduced.

[0058] For example, the contraction amplitude of a single partition rib 4 can be 0.01 times the width of the inlet of the cold air flow channel 5, and the spanwise length of the tapered portion can be 0.35 times the length of the cold air flow channel 5.

[0059] As Figure 5As shown, in some embodiments, on a projection plane perpendicular to the third direction, the projected contour line of the middle section of each of the first wall surface 51 and the second wall surface 52 is a first wavy line extending along the second direction, and the amplitude of the first wavy line is A1, where 0.1B≤A1≤0.15B. In other words, the middle section of each of the first wall surface 51 and the second wall surface 52 is a first wavy (or concave-convex) wall surface extending along the flow direction of the cold air.

[0060] Furthermore, the wavelength of the first wave line is l1, 0.2L≤l1≤0.25L.

[0061] Furthermore, the length of the projection contour line of the middle section of each of the first wall surface 51 and the second wall surface 52 on the reference plane is the spanwise length γ, and 0.45L≤γ≤0.55L.

[0062] It can be understood that the middle section of each of the first wall 51 and the second wall 52 adopts a first wavy wall extending along the flow direction of the cold air, which increases the contact area between the cold air flow duct 5 and the cold air and enhances the heat dissipation effect of the cold air flow duct 5. At the same time, the middle part of the cold air flow duct 5 is within the above-mentioned design parameter range, which can further improve the heat exchange performance of the trailing edge of the blade compared with the relevant technology.

[0063] For example, the amplitude of the first wavy wall surface may be 0.125 times the width of the inlet of the cold flow channel 5 , the wavelength may be 0.225 times the length of the cold flow channel 5 , and the span length may be 0.5 times the length of the cold flow channel 5 .

[0064] like Figures 2 to 5 As shown, in some embodiments, the end of the second section of each of the first wall 51 and the second wall 52 facing away from the middle section is connected to the air outlet 32 ​​of the slit. The distance between the second section of the first wall 51 and the second section of the second wall 52 gradually increases in the direction from the air inlet 31 of the slit toward the air outlet. In other words, along the flow direction of the cold air, the two opposing walls of the partition rib 4 along its thickness gradually move away from the centerline of the cold air flow channel 5 at the second section. In other words, the second section of the first wall 51 and the second section of the second wall 52 in the cold air flow channel 5 form a gradually expanding portion of the cold air flow channel 5 in the slit 3.

[0065] It can be understood that designing the outlet of the cold air flow duct 5 as an expansion structure can make the cooling air film in the downstream area of ​​the blade more evenly distributed, avoid the uneven distribution of the air film caused by multiple partition ribs 4, and better protect the trailing edge wall of the blade.

[0066] Further, the expansion range of the second section of each of the first wall surface 51 and the second wall surface 52 is defined as λ on the projection plane in the third direction, and the expansion range is the difference between the projection of the corresponding second section and the projection of the reference plane at the longest distance and the shortest distance, 0.1B≤λ≤0.15B.

[0067] The expansion range is the difference between the projection of the corresponding second section and the projection of the reference plane at the longest distance and the shortest distance, that is, the longest distance between the projection of the second section of the first wall surface 51 (or the second section of the second wall surface 52) and the projection of the reference plane, minus the shortest distance between the projection of the second section of the first wall surface 51 (or the second section of the second wall surface 52) and the projection of the reference plane, that is, the contraction range λ.

[0068] Further, the length of the second section of each of the first wall surface 51 and the second wall surface 52 is s, 0.1L≤s≤0.15L.

[0069] It can be understood that the expansion range and the length of the diverging section designed in the above range can further ensure that the cooling air film forms a good cooling protection coverage at the blade trailing edge part compared with the related art.

[0070] For example, the expansion range of the single partition rib 4 can be 0.125 times the width of the inlet of the cold air flow channel 5, and the length of the diverging section can be 0.15 times the length of the cold air flow channel 5.

[0071] As shown in FIG. 1, Figures 3 to 5 In some embodiments, the cold air flow channel 5 further includes a third wall surface 53 opposite to the third direction and located between the first wall surface 51 and the second wall surface 52, and the third wall surface 53 is connected with the inner wall surface of the cold air cavity 2 and the air outlet 32 of the split joint, that is, the third wall surface 53 is the groove bottom wall of the cold air flow channel 5.

[0072] On the projection plane in the first direction, the projection contour line of the third wall surface 53 is a second wavy line extending along the second direction, and the wave amplitude of the second wavy line is A2, 0.175B≤A2≤0.225B. In other words, the third wall surface 53 is a second wavy (or recessed and protruding structure) wall surface extending along the flow direction of the cold air.

[0073] Further, the wavelength of the second wavy line is l2, 0.225B≤l2≤0.275B.

[0074] It can be understood that the third wall 53 is distributed between the first wall 51 and the second wall 52, and has wavy recesses and protrusions arranged at intervals along the flow direction of the cold air, which increases the contact area between the cold air flow duct 5 and the cold air. Based on the structural design of the first wall 51 and the second wall 52, the heat dissipation effect of the cold air flow duct 5 can be further enhanced, while promoting the mixing performance between the cold air outflow and the mainstream gas, thereby improving the uniformity of the airflow and temperature distribution at the downstream blade inlet.

[0075] For example, the amplitude of the second wavy wall surface may be 0.2 times the width of the inlet of the cold flow channel 5 , and the wavelength may be 0.25 times the width of the inlet of the cold flow channel 5 .

[0076] like Figures 1 to 5 As shown, in some embodiments, the pressure side 11 and the suction side 12 of the blade body 1 form a trailing edge 13 extending in the first direction at the connection point of the trailing edge. The height of the blade body 1 is H. On a projection plane perpendicular to the third direction, the projected contour of the trailing edge 13 is a third wavy line extending in the first direction. The amplitude of the third wavy line is A3, and 0.05H≤A3≤0.1H. In other words, the trailing edge 13 is a third wavy wall surface (or a concave-convex structure) extending along the blade height direction.

[0077] Furthermore, the wavelength of the third wave line is l3, 0.15H≤l3≤0.2H.

[0078] It can be understood that the trailing edge 13 is applied to the junction of the trailing edges of the pressure side 11 and the suction side 12 of the blade, and has wavy depressions and protrusions arranged at intervals along the blade height direction, which increases the heat exchange area of ​​the trailing edge of the blade and improves the heat exchange capacity of the weak part of the trailing edge of the blade.

[0079] For example, the amplitude of the third wavy wall surface may be 0.07 times the height of the blade body 1 , and the wavelength may be 0.17 times the height of the blade body 1 .

[0080] It should be noted that the optimal values ​​of all the above parameters can be obtained with the help of existing computational fluid dynamics software numerical simulation or related experiments.

[0081] Furthermore, a first wavy edge is formed at the connection between the second section of each of the first wall 51 and the second wall 52 and the air outlet 32 ​​of the slit on the pressure surface 11 of the blade body 1, and the first wavy edge extends along the blade profile direction of the pressure surface 11 of the blade body 1. A second wavy edge is formed at the connection between the third wall 53 and the inner wall of the cold air cavity 2, and at the connection between the third wall 53 and the air outlet 32 ​​of the slit on the pressure surface 11 of the blade body 1, and the second wavy edge extends along the first direction.

[0082] Therefore, when the first wall surface 51, the second wall surface 52, the third wall surface 53 and the trailing edge 13 all adopt the above structure design, the three of the partition rib 4, the third wall surface 53 and the trailing edge 13 are all of the bionic type structure (such as the bionic bird flapping wing structure), the technical problems of large flow resistance of the cold air flow channel 5 in the horizontal exhaust type trailing edge split joint 3, uneven distribution of the air film in the downstream area of the split joint 3 and uneven air flow of the downstream blade are solved, and the effects of reducing the flow resistance in the cold air flow channel 5, improving the heat dissipation effect of the cold air flow channel 5, homogenizing the cooling air film distribution in the downstream area of the blade, improving the turbine cooling performance and improving the uniformity of the air flow entering the downstream blade are achieved.

[0083] An engine according to an embodiment of the present application comprises the blade according to any one of the above embodiments.

[0084] The technical advantages of the engine according to the embodiment of the present application are the same as those of the above blade, and will not be repeated here.

[0085] In the description of the present application, it should be understood that the orientations or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0086] In addition, the terms "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first" and "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0087] In the present application, unless otherwise specifically defined and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, can be fixedly connected, or can be detachably connected, or can be integrated; can be mechanically connected, or can be electrically connected or in communication with each other; can be directly connected, or can be indirectly connected through an intermediate medium; can be the internal communication or interaction relationship of two elements, unless otherwise specifically limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0088] In the present application, unless specifically stated and limited otherwise, a first feature "on" or "under" a second feature can be directly in contact with the second feature, or indirectly in contact with the second feature through an intermediate medium. Also, a first feature "over", "above" and "on top of" a second feature can be directly above or obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature. A first feature "under", "below" and "underneath" a second feature can be directly below or obliquely below the second feature, or simply means that the first feature is horizontally lower than the second feature.

[0089] In the present application, the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" mean that a particular feature, structure, material or characteristic is included in at least one embodiment or example of the present application. Exemplary representations of the above terms in the present specification are not necessarily directed to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics can be combined in any suitable manner in one or more embodiments or examples. In addition, different embodiments or examples described in the present specification and features of different embodiments or examples can be combined and combined by those skilled in the art without contradiction.

[0090] Although the embodiments of the present application have been shown and described above, it is understood that the above-described embodiments are exemplary, and should not be construed as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above-described embodiments within the scope of the present application.

Claims

1. A blade with a half-slit cooling structure, characterized in that: The blade body comprises a cold air cavity and a slit, an air inlet of the slit is connected to the cold air cavity, an air outlet of the slit is formed on the pressure surface of the blade body and is connected to the outside, the slit is adjacent to the trailing edge of the blade body and is provided with a partition rib, the partition rib is at least one and divides the slit into at least two cold air flow channels, all the cold air flow channels are arranged at intervals along a first direction, the first direction is the height direction of the blade body, the cold air flow channels extend along a second direction, and the second direction forms an angle with the first direction; The cross-sectional area of ​​the portion of the cold air flow channel adjacent to the air inlet of the slit gradually decreases in the direction from the air inlet of the slit toward the air outlet; The cold air flow channel includes a first wall surface and a second wall surface arranged opposite to each other along the first direction, and the first wall surface and the second wall surface each include a first section, a middle section and a second section sequentially connected along the second direction; An end portion of the first section of each of the first wall surface and the second wall surface facing away from the middle section is connected to the inner wall surface of the cold air cavity, and a distance between the first section of the first wall surface and the first section of the second wall surface gradually decreases in a direction from the air inlet toward the air outlet of the slit; The first wall surface and the second wall surface are mirror-symmetrical with respect to a reference plane, and the reference plane is perpendicular to the first direction; On a projection plane perpendicular to the third direction, the width of the projection contour line of the inlet of the cold air flow duct is B, and the contraction amplitude of the first segment of each of the first wall surface and the second wall surface is defined as α, where the contraction amplitude is the difference between the projection of the corresponding first segment and the projection of the reference plane at the longest and shortest distances, and 0.075B≤α≤0.125B, wherein the third direction is perpendicular to both the first direction and the second direction; On a projection surface perpendicular to the third direction, a projection contour line of a middle section of each of the first wall surface and the second wall surface is a first wavy line extending along the second direction, and an amplitude of the first wavy line is A1, 0.1B≤A1≤0.15B.

2. The blade with a half-slit cooling structure according to claim 1, characterized in that: The length of the cold air flow channel is L, and the length of the projection contour line of the first section of each of the first wall surface and the second wall surface on the reference plane is a spanwise length β, where 0.3L≤β≤0.4L.

3. The blade with a half-slit cooling structure according to claim 1, characterized in that: The wavelength of the first wave line is l1, 0.2L≤l1≤0.25L.

4. The blade with a half-slit cooling structure according to claim 1, characterized in that: The length of the projection contour line of the middle section of each of the first wall surface and the second wall surface on the reference plane is a spanwise length γ, and 0.45L≤γ≤0.55L.

5. The blade with a half-slit cooling structure according to claim 1, characterized in that: The end of the second section of each of the first wall and the second wall facing away from the middle section is connected to the air outlet of the slit, and the distance between the second section of the first wall and the second section of the second wall gradually increases in the direction from the air inlet of the slit toward the air outlet.

6. The blade with a half-slit cooling structure according to claim 5, characterized in that: On a projection surface perpendicular to the third direction, define an expansion amplitude of the second segment of each of the first wall surface and the second wall surface as λ, wherein the expansion amplitude is the difference between the projection of the corresponding second segment and the projection of the reference surface at the longest distance and the shortest distance, and 0.1B≤λ≤0.15B; The length of the second segment of each of the first wall and the second wall is s, 0.1L≤s≤0.15L.

7. The blade with a half-slit cooling structure according to any one of claims 1 to 6, characterized in that: The cold air flow channel further includes a third wall surface, the third wall surface is opposite to the third direction and is located between the first wall surface and the second wall surface, and the third wall surface is connected to the inner wall surface of the cold air cavity and the air outlet of the slit; On a projection surface perpendicular to the first direction, a projection contour line of the third wall surface is a second wavy line extending along the second direction, and an amplitude of the second wavy line is A2, 0.175B≤A2≤0.225B; The wavelength of the second wave line is l2, 0.225B≤l2≤0.275B.

8. The blade with a half-slit cooling structure according to claim 7, characterized in that: The pressure surface and the suction surface of the blade body form a trailing edge extending along the first direction at the connection point of the trailing edge. The height of the blade body is H. On a projection plane perpendicular to the third direction, the projection contour line of the trailing edge is a third wave line extending along the first direction. The amplitude of the third wave line is A3, and 0.05H≤A3≤0.1H. The wavelength of the third wave line is l3, 0.15H≤l3≤0.2H.

9. An engine, characterized in that: The engine comprises the blade according to any one of claims 1-8.

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