Blade structures, turbine components and engines

Abstract

The present invention relates to a blade structure, a turbine assembly and an engine. The blade structure includes a body, the body includes a chamber for temporarily storing cooling gas and a Tesla valve channel, the Tesla valve channel includes an inlet and an outlet, the Tesla valve channel is configured so that the inlet is connected to the chamber, and the outlet is used to communicate with the outside, so that the cooling gas in the chamber can flow out unidirectionally through the Tesla valve channel. In the above blade structure, the Tesla valve channel includes an inlet and an outlet, the inlet is connected to the chamber, and the outlet is used to communicate with the outside, the cooling gas in the cavity is driven by the internal and external pressure difference, and can flow out unidirectionally through the inlet and the outlet, thereby forming an air film on the outer wall of the body to protect the body; when in a transition state, because the gas can only flow unidirectionally in the Tesla valve channel, the high-temperature gas is not easy to invade the chamber, which prevents the backflow of hot gas, reduces the thermal load and thermal stress of the blade, and improves the reliability of the turbine.

Description

Technical Field

[0001] The present invention relates to the technical field of engines, and in particular to a blade structure, a turbine assembly and an engine. Background Art

[0002] A turbine engine is an engine that uses rotating parts to extract kinetic energy from the fluid passing through it. A gas turbine engine includes an air inlet, a compressor, a combustion chamber, and a turbine assembly. The turbine assembly includes a turbine, a rotating shaft, and multiple blades spirally arranged on the rotating shaft. During operation, the high-pressure air from the compressor mixes and burns with the fuel in the combustion chamber. The resulting high-pressure combustion gas enters the turbine and pushes the blades to do work. The blades are provided with chambers and cooling holes connected to the chambers. The cooling gas in the turbine is driven by the internal and external pressure difference, and passes through the chambers and cooling holes in turn, thereby forming an air film on the surface of the blades, isolating the external high-temperature gas and protecting the blades.

[0003] In a turbine engine, due to the large number of working state points, it is usually necessary to switch from one point to another, such as changing the adjustable nozzle area or adjusting the turbine guide vanes. This is the transition state. The existing cooling holes are all straight-spray hole structures. When the turbine engine is in the transition state, the mainstream gas pressure of the turbine at certain working state points is greater than the cold gas pressure, the pressure is reversed, and the pressure in the chamber is less than the mainstream gas pressure, resulting in the cooling gas being unable to be ejected from the chamber to the cooling hole, and even high-temperature gas backflows into the cooling hole, causing the cold gas hole to be burned by the high-temperature gas, reducing the cooling efficiency of the blades, and the blades crack due to excessive local thermal stress, affecting the reliability of the turbine. Summary of the invention

[0004] Based on this, in order to prevent external high-temperature gas from flowing back into the chamber, a blade structure is provided.

[0005] A blade structure, comprising:

[0006] The main body includes a chamber for temporarily storing cooling gas and a Tesla valve channel, wherein the Tesla valve channel includes an inlet and an outlet, and the Tesla valve channel is configured so that the inlet is connected to the chamber, and the outlet is used to communicate with the outside, so that the cooling gas in the chamber can flow out unidirectionally through the Tesla valve channel.

[0007] In one embodiment, the blade structure includes a plurality of Tesla valve channels, and the plurality of Tesla valve channels are arranged around the chamber.

[0008] In one embodiment, the blade structure includes a plurality of Tesla valve channels connected in sequence, the inlet of any Tesla valve channel is connected to the outlet of an adjacent Tesla valve channel, and the plurality of Tesla valve channels are configured so that the inlet of the Tesla valve channel at the head end is connected to the chamber, and the outlet of the Tesla valve channel at the end is used to communicate with the outside, so that the cooling gas in the chamber can flow out in one direction through the plurality of Tesla valve channels in sequence.

[0009] In one embodiment, the Tesla valve channel includes a side channel and a main channel located on a unidirectional flow path, the side channel is located on one side of the main channel, and the side channel includes a first end and a second end both connected to the main channel, the first end is close to the inlet, the second end is close to the outlet, and the line connecting the center points of any two main channels is used as the axis;

[0010] The included angle between the main channel and the axis is α, and the included angle between the tangent line at the intersection of the first end and the main channel and the axis is β, wherein 0°<α<60°, 0°<β<60°.

[0011] In one embodiment, the angle between the axis and the tangent line at the outlet of the Tesla valve channel at the end of the body is θ, where 0°<θ≤90°, 10°≤θ-α≤50°, and 130°≤θ+α≤170°.

[0012] In one embodiment, the aperture of the main channel is W1, the aperture of the side channel is W2, and the wall thickness of the turbine is T. <W1<0.5T,0<W2<0.5T。

[0013] In one embodiment, a plurality of the chambers are provided, and the plurality of the chambers are arranged along the length direction of the body, and each of the chambers is configured with at least one Tesla valve channel.

[0014] In one embodiment, the Tesla valve channel further includes a flared expansion channel, a small end of the expansion channel is connected to the outflow port, and a large end of the expansion channel is used to communicate with the outside.

[0015] The present invention also provides a turbine assembly, comprising a rotating shaft and the blade structure described above, wherein a plurality of the bodies are connected to the rotating shaft and are arranged circumferentially around the rotating shaft.

[0016] The present invention also provides an engine, comprising the turbine assembly described above.

[0017] Beneficial effects of the present invention:

[0018] The above-mentioned blade structure has a main body including a chamber and a Tesla valve channel. The chamber is used to temporarily store cooling gas. The Tesla valve channel includes an inlet and an outlet. The inlet is connected to the chamber, and the outlet is used to communicate with the outside. The cooling gas in the cavity is driven by the internal and external pressure difference and can flow out unidirectionally through the inlet and the outlet, thereby forming an air film on the outer wall of the main body to protect the main body. When in a transition state, that is, the pressure in the chamber is lower than the mainstream fuel gas pressure, because the gas can only flow unidirectionally in the Tesla valve channel, high-temperature gas is not easy to invade into the chamber, thereby preventing hot gas backflow, reducing the thermal load and thermal stress of the blades, and improving the reliability of the turbine. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 For the existing blade structure;

[0020] Figure 2 A schematic diagram of the structure of a blade provided by an embodiment of the present invention;

[0021] Figure 3 A cross-sectional view of a blade provided by an embodiment of the present invention;

[0022] Figure 4 A schematic diagram of the structure of a Tesla valve channel provided in an embodiment of the present invention;

[0023] Figure 5 A schematic diagram of a structure in which two Tesla valve channels are connected in sequence according to an embodiment of the present invention;

[0024] Figure 6 A schematic diagram of the structural relationship between two sequentially connected Tesla valve channels and an axis provided in an embodiment of the present invention;

[0025] Figure 7 A schematic diagram of a structure in which a Tesla valve channel is provided on a body according to an embodiment of the present invention;

[0026] Figure 8 A schematic diagram of a structure in which cooling gas flows from a chamber to outside the chamber provided in an embodiment of the present invention;

[0027] Fig. 9 A schematic diagram of the structure of high temperature gas flowing from outside the cavity to the cavity provided in an embodiment of the present invention.

[0028] In the figure:

[0029] 100. Body; 110. Chamber; 120. Trailing edge split;

[0030] 200, Tesla valve channel; 210, main channel; 220, side channel; 230, expansion channel. DETAILED DESCRIPTION

[0031] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0032] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0033] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0034] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0036] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0037] The turbine assembly is the most important component of the gas turbine and turbine engine. The melting point of the metal used to make the turbine is about 1600K, while the inlet temperature of the turbine has reached 1900K-2100K. In order to ensure that the blades work normally in a high temperature and complex environment, the cooling of the turbine assembly is essential. The turbine assembly includes a turbine, a shaft, and a plurality of blades spirally arranged on the shaft, such as Figure 1 As shown, a chamber 110 and a cooling hole connected to the chamber 110 are provided on the body 100 of the blade. The cooling gas is driven by the internal and external pressure difference, and flows out through the turbine, the chamber 110 of the body 100, and the cooling hole in sequence, so as to adhere to the surface of the body 100, form air film cooling, isolate the external high-temperature gas, and protect the body 100. Existing cooling holes are mainly straight spray holes, such as round holes, fan-shaped holes, contraction and expansion holes, etc., which are essentially driven by pressure gradients and sprayed in the form of jets to cover the surface of the body 100. When the turbine engine is in a transition state, the mainstream gas pressure of the turbine is greater than the cold gas pressure at certain state points during operation, and the pressure is reversed. The pressure of the chamber 110 is less than the mainstream gas pressure, resulting in the inability of the cooling gas to spray out of the cooling hole from the chamber 110, and even the high-temperature gas backflows into the cooling hole, resulting in the cold gas hole being ablated by the high-temperature gas, reducing the cooling efficiency of the body 100, and the body 100 is cracked due to excessive local thermal stress, affecting the reliability of the turbine.

[0038] In order to prevent the external high temperature gas from flowing back into the chamber 110, the embodiment of the present invention provides a blade structure, such as Figures 1 to 3 As shown, the blade structure includes a main body 100, the main body 100 includes a chamber 110 for temporarily storing cooling gas and a Tesla valve channel 200, the Tesla valve channel 200 includes an inlet and an outlet, the Tesla valve channel 200 is configured so that the inlet is connected to the chamber 110, and the outlet is used to communicate with the outside, so that the cooling gas in the chamber 110 can flow out unidirectionally through the Tesla valve channel 200.

[0039] In the above-mentioned blade structure, the chamber 110 is used to temporarily store cooling gas, and the Tesla valve channel 200 includes an inlet and an outlet, the inlet is connected to the chamber 110, and the outlet is used to communicate with the outside. The cooling gas in the cavity is driven by the internal and external pressure difference and can flow out unidirectionally through the inlet and the outlet, thereby forming an air film on the outer wall of the main body 100 to protect the main body 100; when in a transition state, that is, the pressure in the chamber 110 is lower than the mainstream fuel gas pressure, because the gas can only flow unidirectionally in the Tesla valve channel 200, the high-temperature gas is not easy to invade into the chamber 110, thereby preventing hot gas backflow, reducing the thermal load and thermal stress of the blades, and improving the reliability of the turbine.

[0040] Specifically, the main body 100 is fan-shaped, and a chamber 110 and a Tesla valve channel 200 are opened on the main body 100, and the inlet of the Tesla valve channel 200 is connected to the chamber 110, and the outlet extends to the outer wall of the main body 100, thereby connecting with the outside world. The cooling gas flows out through the chamber 110 and the Tesla valve channel 200, thereby forming an air film on the outer wall of the main body 100 to protect the main body 100.

[0041] In some embodiments, Figure 3 As shown, there are multiple chambers 110, which are arranged along the length direction of the body 100, and each chamber 110 is equipped with at least one Tesla valve channel 200. Providing multiple chambers 110 increases the volume of temporarily stored cooling gas and further improves the cooling efficiency.

[0042] It is understood that, in some embodiments, each chamber 110 is configured with at least one Tesla valve channel 200. In some embodiments, a plurality of chambers 110 are provided on the body 100, but only some of the chambers 110 are configured with Tesla valve channels 200, and especially the chambers 110 that are particularly sensitive to pressure can be configured with Tesla valve channels 200, for example, in the area on the body 100 of the blade where gas backflow is prone to occur, relatively more Tesla valve channels 200 can be arranged, for example, Tesla valve channels 200 are configured in the chambers 110 near the leading edge of the body 100 and the chambers 110 near the trailing edge.

[0043] Furthermore, in some embodiments, Figure 3 As shown, the body 100 is provided with a trailing edge slit 120, and the trailing edge slit 120 is communicated with the chamber 110, and the cooling gas temporarily stored in the chamber 110 can flow out through the trailing edge slit 120, thereby forming an air film on the outer wall of the body 100 to protect the body 100. At the same time, due to the application of this configuration, the pressure in the chamber 110 is relatively stable, and is very little affected by the pressure outside the chamber 110. The stable chamber pressure will have a more stable and effective protective effect on the cooling of the trailing edge slit 120, and will no longer be affected by the working conditions, effectively preventing the trailing edge of the body 100 from being thermally corroded by high-temperature combustion gas.

[0044] In some embodiments, Figure 3 As shown, the blade structure includes a plurality of Tesla valve channels 200, and the plurality of Tesla valve channels 200 are arranged around the chamber 110. The Tesla valve channel 200 is a primary structure, and a plurality of Tesla valve channels 200 are arranged on the body 100, and the plurality of Tesla valve channels 200 are arranged around the chamber 110, and the inlets of the plurality of Tesla valve channels 200 are all connected to the chamber 110, and the outlets of the plurality of Tesla valve channels 200 are all connected to the outside, thereby increasing the cooling efficiency of the body 100.

[0045] In some embodiments, Figure 3 and Figure 5 As shown, the blade structure includes a plurality of Tesla valve channels 200 connected in sequence, the inlet of any Tesla valve channel 200 is connected to the outlet of an adjacent Tesla valve channel 200, and the plurality of Tesla valve channels 200 are configured such that the inlet of the Tesla valve channel 200 located at the head end is connected to the chamber 110, and the outlet of the Tesla valve channel 200 located at the end is used to communicate with the outside, so that the cooling gas in the chamber 110 can flow out in one direction through the plurality of Tesla valve channels 200 in sequence. Multiple Tesla valve channels 200, i.e., multi-stage Tesla valve channels 200, are provided. Multiple Tesla valve channels 200 are connected in sequence. The inlet of the Tesla valve channel 200 at the head end is connected to the chamber 110, and the outlet of the Tesla valve channel 200 at the end is used to communicate with the outside, so that the cooling gas in the chamber 110 can flow out in one direction through the multi-stage Tesla valve channels 200 in sequence, thereby increasing the length of the high-temperature gas flow path of the high-temperature gas entering the chamber 110, further preventing external high-temperature gas from backflowing into the chamber 110, reducing the thermal load and thermal stress of the blades, and improving the reliability of the turbine.

[0046] Specifically, a plurality of groups of multi-stage Tesla valve channels 200 are provided on the body 100. More specifically, as Figure 3 As shown, in some embodiments, the Tesla valve channel 200 is a two-stage structure, that is, two Tesla valve channels 200 connected in sequence are provided, the outflow outlet of the first Tesla valve channel 200 is connected to the inflow inlet of the second Tesla valve channel 200, the inflow inlet of the first Tesla valve channel 200 is connected to the chamber 110, and the outflow outlet of the second Tesla valve channel 200 extends to the outer wall of the body 100 and is connected to the outside, and the cooling gas in the chamber 110 can flow out unidirectionally through the chamber 110, the first Tesla valve channel 200, and the second Tesla valve channel 200 in sequence.

[0047] Specifically, Figure 3As shown, in some embodiments, a plurality of first-stage Tesla valve channels 200 and a plurality of second-stage Tesla valve channels 200 are provided on the body 100. It can be understood that, in some embodiments, Tesla valve channels 200 are provided on the body 100, and the number of stages of the Tesla valve channels 200 is determined according to the actual operating conditions. For example, the number of stages of the Tesla valve channels 200 can be three, four, five, etc.

[0048] Further, as Figure 3 shown, the chord length of the body 100 is C, that is, the chord length of the body 100 along the length direction is C, and the wall thickness of the turbine is T, where 0 < T < 0.1C.

[0049] Further, as Figure 4 shown, the Tesla valve channel 200 includes a side channel 220 and a main channel 210 located on the one-way flow path. The side channel 220 is located on one side of the main channel 210, and the side channel 220 includes a first end and a second end both communicating with the main channel 210. The first end is close to the inlet, and the second end is close to the outlet. The cooling gas can flow out through the chamber 110 and the main channel 210 and form an air film on the surface of the body 100 to protect the body 100. The side channel 220 is a curved pipe, and the design of the side channel 220 can increase the specific surface area of heat exchange and prevent external high-temperature gas from flowing into the chamber 110. Specifically, the main channel 210 includes an inlet and an outlet.

[0050] In some embodiments, as Figure 4 shown, the Tesla valve channel 200 further includes a flared expansion channel 230. The small end of the expansion channel 230 communicates with the outlet, and the large end of the expansion channel 230 is used to communicate with the outside. By providing the expansion channel 230, the cooling gas flows out successively through the chamber 110, the inlet of the main channel 210, the main channel 210, the outlet of the main channel 210, and the expansion channel 230, forming an air film on the blade surface to isolate the external high-temperature gas and protect the blade. Setting the expansion channel 230 can reduce the velocity of the cooling gas at the outlet, making it better adhere to the surface of the body 100. Specifically, the expansion angle of the expansion channel 230 is φ, where 0 ≤ φ ≤ 45°.

[0051] In some embodiments, as Figure 4 shown, the aperture of the main channel 210 is W1, the aperture of the side channel 220 is W2, and the wall thickness of the turbine is T. 0 < W1 < 0.5T, 0 < W2 < 0.5T. By setting the aperture W1 of the main channel 210 and the aperture W2 of the side channel 220, a specific quantitative relationship is maintained between W1, W2 and the wall thickness T of the turbine, which is convenient for machining on the blade. More specifically, W1 and W2 also depend on the machining accuracy of the superalloy and the cooling requirements of the body 100.

[0052] In some embodiments, as Figures 4 to 6 As shown, the Tesla valve channel 200 includes a side channel 220 and a main channel 210 located on a unidirectional flow path, the side channel 220 is located on one side of the main channel 210, and the side channel 220 includes a first end and a second end both connected to the main channel 210, the first end is close to the inlet, the second end is close to the outlet, and the line connecting the center points of any two main channels 210 is the axis; the angle between the main channel 210 and the axis is α, and the angle between the tangent at the intersection of the first end and the main channel 210 and the axis is β, wherein 0°<α<60°, 0°<β<60°. The angle α between the main channel 210 and the axis is set within the range of 0°-60°, and the angle β between the tangent at the intersection of the first end and the main channel 210 and the axis is set within the range of 0°-60°, so that the Tesla valve channel 200 is distributed on the body 100 with a specific structure, and the unidirectional flow performance of the Tesla valve channel 200 is improved, so that the cooling gas can flow unidirectionally.

[0053] In some embodiments, Figure 7 As shown, the angle between the axis and the tangent of the outlet of the Tesla valve channel 200 at the end of the body 100 is θ, where 0°<θ≤90°, 10°≤θ-α≤50°, and 130°≤θ+α≤170°. The angle between the axis and the tangent of the outlet of the Tesla valve channel 200 at the end of the body 100 is θ, and the angle between the main channel 210 and the axis is α. Then, the angle between the tangent of the outlet of the Tesla valve channel 200 at the end and the main channel 210 is θ-α or θ+α, where 10°≤θ-α≤50°, and 130°≤θ+α≤170°, so that the outlet of the Tesla valve channel 200 at the end is within a specific angle range, so that the cooling gas can smoothly flow out through the outlet, and form an air film and cover the surface of the body 100.

[0054] It can be understood that the angle between the tangent line of the outlet of the Tesla valve channel 200 at the end and the main channel 210 is an acute angle (such as Figure 7 As shown), the above angle is θ-α; when the angle between the tangent of the outlet of the Tesla valve channel 200 at the end and the main channel 210 is an obtuse angle, the above angle is θ+α.

[0055] The blade structure provided by the present invention, at the steady-state design point, is as follows Figure 7 As shown, the pressure in the chamber 110 is greater than the pressure outside the chamber, and the cooling gas temporarily stored in the chamber 110 is ejected through the Tesla valve channel 200 to form a protective film on the blade surface. At the same time, the side channel 220 of the Tesla valve channel 200 is a curved pipe. The design of the side channel 220 can increase the specific surface area of ​​heat exchange and prevent the external high-temperature gas from flowing into the chamber 110. In the transition state, Figure 8As shown, the pressure of the chamber 110 is lower than the pressure outside the chamber. After the Tesla valve channel 200 is set on the body 100, the high-temperature gas is not easy to invade the chamber 110, thereby preventing the high-temperature gas from flowing back, protecting the body 100, and reducing the thermal load and thermal stress of the blade. Even if the high-temperature gas outside the cavity flows into the chamber 110 through the side channel 220 of the Tesla valve channel 200, the side channel 220 is a curved pipe. The design of the side channel 220 can increase the specific surface area of ​​heat exchange, increase the flow path of the high-temperature gas, and increase the flow time. As the flow time increases, the temperature of the high-temperature gas flowing into the chamber 110 is reduced. The Tesla valve channel 200 and the trailing edge slit 120 are set on the body 100, which can ensure the stability of the pressure of the chamber 110 and cool the trailing edge of the blade at the same time. The invention can be applied not only to the cooling structure of turbine rotor blades, but also to the cooling structure of turbine guide vanes and the cooling structure of some support plates.

[0056] The embodiment of the present invention also provides a turbine assembly, including a rotating shaft and the above-mentioned blade structure, wherein a plurality of bodies 100 are connected to the rotating shaft and arranged circumferentially around the rotating shaft. The plurality of bodies 100 are spirally arranged on the rotating shaft and operated by the rotation of the blades. In the turbine assembly of the present invention, the cooling gas in the cavity of the body 100 is driven by the internal and external pressure difference, and can flow out unidirectionally through the inlet and outlet, thereby forming an air film on the outer wall of the body 100, protecting the body 100, preventing the backflow of high-temperature gas, and improving the performance of the turbine assembly.

[0057] The embodiment of the present invention further provides an engine, comprising the above-mentioned turbine assembly. The above-mentioned turbine assembly is installed in the turbine chamber of the engine. In the engine provided by the present invention, the blade cooling effect of the turbine assembly is better, and the cooling gas in the chamber 110 of the blade body 100 can only flow out to the surface of the body 100 in one direction, and the external high-temperature gas cannot flow into the chamber 110 through the Tesla valve channel 200, thereby preventing the high-temperature gas from flowing back and improving the performance of the engine.

[0058] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0059] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A blade structure, characterized in that: include: A body (100) comprises a chamber (110) for temporarily storing cooling gas and a Tesla valve channel (200), wherein the Tesla valve channel (200) comprises an inlet and an outlet, wherein the Tesla valve channel (200) is configured such that the inlet communicates with the chamber (110), and the outlet communicates with the outside, so that the cooling gas in the chamber (110) can flow out in one direction through the Tesla valve channel (200); The blade structure includes a plurality of Tesla valve channels (200) connected in series, the inlet of any Tesla valve channel (200) being connected to the outlet of an adjacent Tesla valve channel (200), and the plurality of Tesla valve channels (200) being configured such that the inlet of the Tesla valve channel (200) at the head end is connected to the chamber (110), and the outlet of the Tesla valve channel (200) at the end end is used to communicate with the outside, so that the cooling gas in the chamber (110) can flow out in one direction through the plurality of Tesla valve channels (200) in sequence.

2. The blade structure according to claim 1, characterized in that: The blade structure includes a plurality of Tesla valve channels (200), and the plurality of Tesla valve channels (200) are arranged around the chamber (110).

3. The blade structure according to claim 1, characterized in that: The Tesla valve channel (200) comprises a side channel (220) and a main channel (210) located on a unidirectional flow path, wherein the side channel (220) is located on one side of the main channel (210), and the side channel (220) comprises a first end and a second end both connected to the main channel (210), wherein the first end is close to the inlet, and the second end is close to the outlet, and a line connecting the center points of any two main channels is used as an axis; The angle between the main channel (210) and the axis is α, and the angle between the tangent line at the intersection of the first end and the main channel (210) and the axis is β, wherein 0°<α<60°, 0°<β<60°.

4. The blade structure according to claim 3, characterized in that: The angle between the axis and the tangent line of the outlet of the Tesla valve channel (200) at the end of the body (100) is θ, wherein 0°<θ≤90°, 10°≤θ-α≤50°, and 130°≤θ+α≤170°.

5. The blade structure according to claim 3, characterized in that: The aperture of the main channel (210) is W1, the aperture of the side channel (220) is W2, the wall thickness of the turbine is T, 0 <W1<0.5T,0<W2<0.5T。 6. The blade structure according to claim 1, characterized in that: A plurality of chambers (110) are provided, and the plurality of chambers (110) are arranged along the length direction of the body (100), and each chamber (110) is configured with at least one Tesla valve channel (200).

7. The blade structure according to claim 1, characterized in that: The Tesla valve channel (200) further comprises an expansion channel (230) in a flared shape, wherein a small end of the expansion channel (230) is connected to the outflow port, and a large end of the expansion channel (230) is used to communicate with the outside.

8. A turbine assembly, characterized in that: It comprises a rotating shaft and the blade structure according to any one of claims 1 to 7, wherein a plurality of the bodies (100) are connected to the rotating shaft and are arranged around the circumference of the rotating shaft.

9. An engine, characterized in that: Includes the turbine assembly as claimed in claim 8.

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