A turbine blade

Abstract

The present invention provides a turbine moving blade, including a blade body, wherein the blade body is formed by stacking and twisting a plurality of basic two-dimensional blade profiles, wherein the basic two-dimensional blade profile includes a basic two-dimensional blade profile section, and the basic two-dimensional blade profile section has parameters: a total blade height H and a relative pitch; a variation rule of the relative pitch of the basic two-dimensional blade profile section is as follows: the relative pitch from the root section to the middle section of the basic two-dimensional blade profile section along the direction of the total blade height H gradually increases, and the relative pitch from the middle section to the top section gradually decreases; based on the blade body height, the variation rule of the outlet geometric angle and the relative pitch along the blade height direction is determined, thereby reducing the steam leakage in the blade top area, increasing the inlet and outlet pressure difference of the moving blade in the blade root area, effectively reducing the secondary flow loss in the end area, and gradually increasing the relative pitch in the middle area as the blade body height increases, thereby effectively controlling the blade profile loss in the middle area of ​​the moving blade.

Description

Technical Field

[0001] The invention belongs to the field of turbine blades, and in particular relates to a turbine moving blade. Background Art

[0002] Carbon dioxide is an ideal compressed gas energy storage method due to its high density, low storage cost, large capacity, long energy storage time, safety and reliability, and no special requirements for geographical conditions for system construction and site selection. At present, there are many turbine units using supercritical carbon dioxide as a working fluid in engineering. However, there is still a blank in using ordinary carbon dioxide as a medium for compressed air energy storage. Using ordinary carbon dioxide as a medium can effectively reduce costs and improve the stability of turbine units.

[0003] The efficiency of traditional turbine units depends largely on the aerodynamic performance of the static and moving blades in the flow, and a large part of the blade loss comes from blade shape loss, steam leakage loss and secondary flow loss. After the blade is three-dimensionally formed using the corresponding forming rules on the basic two-dimensional blade shape, a complex three-dimensional flow is generated in the blade flow channel, with secondary flow loss mainly present in the blade end area and blade shape loss in the middle area of ​​the blade. Studies have found that the leakage fluid between the static and moving parts mixes with the mainstream in the end area of ​​the turbine moving blade, resulting in a surge in secondary flow loss. Using carbon dioxide as the medium for compressed air energy storage requires solving the problems of blade shape loss and secondary flow loss. Reasonable selection of the basic two-dimensional blade shape of the moving blade and control of the load distribution in the blade flow channel can effectively control the blade shape loss in the middle area of ​​the moving blade, but has little effect on the secondary flow loss mainly present in the end area of ​​the moving blade. Therefore, in the process of designing moving blades, the present invention increases the moving blade outlet geometric angle in the blade tip area, reduces the moving blade inlet and outlet pressure difference in the blade tip area, that is, reduces the steam leakage in the blade tip area; reduces the moving blade outlet geometric angle in the blade root area, increases the moving blade inlet and outlet pressure difference in the blade root area, that is, reduces the steam leakage in the stationary blade area of ​​this stage, which can effectively reduce the secondary flow loss in the end area. Summary of the invention

[0004] In view of the above problems, the present invention provides a turbine moving blade including a blade body, which is formed by stacking and twisting a number of basic two-dimensional blade profiles, wherein the basic two-dimensional blade profile includes a basic two-dimensional blade profile section, and the basic two-dimensional blade profile section has parameters: a total blade height H and a relative pitch; a relative pitch variation rule of the basic two-dimensional blade profile section is as follows: along the direction of the total blade height H, the relative pitch of the root section of the basic two-dimensional blade profile gradually increases to the relative pitch of the middle section, and the relative pitch of the middle section gradually decreases to the relative pitch of the top section; the relative pitch of the root section of the basic two-dimensional blade profile is smaller than the relative pitch of the top section of the basic two-dimensional blade profile.

[0005] A further preferred technical solution is: the relative pitch of the basic two-dimensional blade profile is the ratio of t to b, where t represents the pitch and b represents the chord length.

[0006] A further preferred technical solution is that the root section relative to the grating pitch, the middle section relative to the grating pitch and the top section relative to the grating pitch are distributed radially along the following rule:

[0007]

[0008] Where H is the total height of the blade.

[0009] A further preferred technical solution is that the basic two-dimensional blade section is composed of a leading edge, a pressure surface, a trailing edge, and a suction surface connected in sequence.

[0010] A further preferred technical solution is as follows: the superposition rule of the basic two-dimensional blade profile sections is as follows: along the relative blade height from the root to the top, each basic two-dimensional blade profile section has a continuous and smooth transition.

[0011] A further preferred technical solution is that the relative grid pitch distribution law satisfies the following relationship:

[0012] t / b=Ax 2 +Bx+C

[0013] Among them, t / b is the relative pitch of the basic two-dimensional blade section at a certain blade height, x is the relative blade height of the basic two-dimensional blade section at a certain blade height, the relative blade height is the ratio of the section height to the total blade height, and the values ​​of A, B, and C are related to the total blade height.

[0014] A further preferred technical solution is: the basic two-dimensional blade profile section also has a parameter: blade outlet geometric angle, and the blade outlet geometric angle distribution law along the relative blade height satisfies the following relationship:

[0015] arcsin(o / t)=ax 2 +bx+c

[0016] Among them, arcsin (o / t) is the blade outlet geometric angle of the basic two-dimensional blade section at a certain blade height, and the values ​​of a, b, and c are related to the total blade height H.

[0017] A further preferred technical solution is: the blade outlet geometric angle also includes a root section outlet geometric angle, a middle section outlet geometric angle and a top section outlet geometric angle.

[0018] A further preferred technical solution is that the root section outlet geometric angle, the middle section outlet geometric angle and the top section outlet geometric angle vary radially along the following rule:

[0019]

[0020] Among them, is the blade outlet geometric angle of the basic two-dimensional blade section at a certain blade height, and the values ​​of a, b, and c are related to the total blade height H.

[0021] A further preferred technical solution is: the shaping process of the basic two-dimensional blade profile comprises the following steps:

[0022] According to the blade height, select the basic two-dimensional blade shape at different relative blade height positions;

[0023] According to the blade root diameter, number and blade height, determine the variation law of the relative pitch of the basic two-dimensional blade profile at different blade height positions;

[0024] Determine the blade profile pitch at different blade heights based on the number of blades, root diameter and blade height, and determine the chord length of the basic two-dimensional blade profile at different blade heights;

[0025] According to the blade root diameter, number and blade height, determine the variation law of blade outlet geometric angle of basic two-dimensional blade profile at different blade height positions;

[0026] The placement of the blades is adjusted to ensure a continuous and smooth transition of each basic two-dimensional blade cross section.

[0027] The beneficial effects of the present invention are as follows: the blade body of the carbon dioxide turbine moving blade of the present invention is formed by stacking and twisting a number of basic two-dimensional blade shapes according to a certain rule, and the change rule of the outlet geometric angle and the relative pitch along the blade height direction is determined according to the blade body height, and its purpose is: when the blade body height is relatively small, the outlet geometric angle of the moving blade top is greatly increased, and the inlet and outlet pressure difference of the moving blade in the blade top area is reduced, that is, the steam leakage in the blade top area is reduced, and the outlet geometric angle of the moving blade in the blade root area is greatly reduced, and the inlet and outlet pressure difference of the moving blade in the blade root area is increased, that is, the steam leakage in the stationary blade area of ​​this stage is reduced, which can effectively reduce the secondary flow loss in the end area, gradually increase the relative pitch in the middle area, and effectively control the blade shape loss in the middle area of ​​the moving blade.

[0028] The turbine moving blade provided by the present invention can be used not only in carbon dioxide turbine units, but also in turbine systems with various substances as media. Its main advantage is that the relative pitch and outlet geometric angle of the turbine moving blades are determined by equations, thereby achieving the purpose of reducing secondary flow losses in the end area, reducing air leakage in the stationary blade area, and controlling blade profile losses in the middle area of ​​the moving blades.

[0029] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures pointed out in the description, claims and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0031] Figure 1 A simplified structural diagram of a carbon dioxide turbine moving blade is shown;

[0032] Figure 2 A schematic diagram of the geometric dimensions of a basic two-dimensional blade profile is shown;

[0033] Figure 3 The figure shows the distribution of the outlet geometry angle arcsin (o / t) along the blade height at different blade heights.

[0034] The marks in the figure are: 1-blade body, 2-leading edge, 3-trailing edge; 4-root section; 5-middle section; 6-top section; 7-pressure surface; 8-suction surface; 9-chord length; 10-installation angle; 11-pitch; 12-throat width; DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] A turbine moving blade, whose blade body structure is controlled by a special flow pattern law, comprises a blade body 1, wherein the blade body 1 is formed by stacking and twisting a plurality of basic two-dimensional blade profiles according to a certain law, wherein the basic two-dimensional blade profile comprises a basic two-dimensional blade profile section, wherein the basic two-dimensional blade profile section is along the direction of the total height (H) of the blade, and the root section relative pitch (t / b) 根 Relative grating pitch to the middle section (t / b) 中 Gradually increasing, the relative grating pitch of the middle section (t / b) 中 Relative grating pitch to top section (t / b) 顶 Gradually decreases; among them, the relative pitch of the root of the basic two-dimensional blade (t / b) 根 The distance is smaller than the relative grating distance of the top section of the basic two-dimensional blade (t / b) 顶 The relative pitch of

[0037] Its outline is as Figure 1 As shown;

[0038] like Figure 2 As shown, the basic two-dimensional blade section has parameters: installation angle 10, chord length 9, pitch 11, throat width 12, a certain section height h, that is, the basic two-dimensional blade height, the total blade height H, that is, the distance between the blade top section and the blade root section; relative blade height h / H, relative grid pitch t / b; the basic two-dimensional blade section is composed of a total of 4 closed curves connected in sequence, namely, the leading edge 2, the pressure surface 7, the trailing edge 3, and the suction surface 8. The modeling process of the basic two-dimensional blade includes the following steps:

[0039] Select basic two-dimensional blade shape: select basic two-dimensional blade shapes at different relative blade height positions according to the blade height;

[0040] Determine the relative pitch: According to the root diameter, number and blade height of the blades, determine the variation law of the relative pitch of the basic two-dimensional blade profile at different blade height positions;

[0041] Determine the chord length: determine the blade profile pitch at different blade heights based on the number of blades, root diameter and blade height position, and determine the chord length of the basic two-dimensional blade profile at different blade heights;

[0042] Determine the blade outlet geometric angle: According to the blade root diameter, number and blade height, determine the variation law of the blade outlet geometric angle of the basic two-dimensional blade profile at different blade height positions;

[0043] The placement of the blades is adjusted to ensure a continuous and smooth transition of each basic two-dimensional blade cross section.

[0044] The relative pitch t / b is the ratio of the pitch 11 to the chord length 9, and the blade outlet geometric angle is the inverse sine function of the ratio of the throat width 12 to the pitch t, ​​that is, arcsin (o / t).

[0045] Furthermore, it is ensured that the variation rule of the relative pitch along the blade height satisfies the following relationship:

[0046] t / b=Ax 2 +Bx+C

[0047] Wherein, t / b is the relative pitch, x is the relative leaf height of the basic two-dimensional leaf profile section at a certain leaf height, the relative leaf height is the ratio of a certain section height h to the total leaf height H, and the values ​​of A, B, and C are related to the total leaf height H;

[0048] Furthermore, according to the variation law of the outlet geometric angle of the basic two-dimensional blade profile at different blade height positions, the distribution law of the blade outlet geometric angle along the relative blade height h / H satisfies the following relationship:

[0049] arcsin(o / t)=ax 2+bx+c, where x is the relative blade height h / H of a certain section height h of the basic two-dimensional blade profile, arcsin(o / t) is the blade outlet geometric angle of the section, and the values ​​of a, b, and c are related to the total blade height H;

[0050] Furthermore, the relative pitch of the basic two-dimensional blade profile also includes the relative pitch of the root section (t / b) 根 , relative grating pitch of the middle section (t / b) 中 Relative pitch to top section (t / b) 顶 .

[0051] By defining the relative pitch as the root section relative pitch (t / b) 根 , relative grating pitch of the middle section (t / b) 中 Relative pitch to top section (t / b) 顶 , which can more simply and clearly adjust the relative pitch range, facilitate the later modeling construction, and ensure that the present invention is applied to moving blades of different heights. The following formula is used to adjust the relative pitch of the root section (t / b): 根 , relative grating pitch of the middle section (t / b) 中 Relative pitch to top section (t / b) 顶 It can help the shaping construction personnel to better control the shape of the moving blades, achieve a smooth shaping effect and good aerodynamics.

[0052] Furthermore, the root section relative to the grating pitch (t / b) 根 , relative grating pitch of the middle section (t / b) 中 Relative pitch to top section (t / b) 顶 The change law of radial direction satisfies the following relationship:

[0053]

[0054] Where H is the total height of the blade.

[0055] When the total blade height H is less than or equal to 60mm, the difference between the relative pitch of the root section and the relative pitch of the middle section is The difference between the relative pitch of the top section and the relative pitch of the middle section is Here, the total blade height H is less than or equal to 60 mm, which means that the basic two-dimensional blade section is at the bottom of the blade body, that is, the blade root area, where the relative pitch is small.

[0056] When the total blade height H is greater than 60mm and less than or equal to 120mm, the difference between the relative pitch of the root section and the relative pitch of the middle section is The difference between the relative pitch of the top section and the relative pitch of the middle section is Here, the total blade height H is greater than 60 mm and less than or equal to 120 mm, which means that the basic two-dimensional blade profile section is in the middle of the blade body. The relative pitch here is the largest, which can effectively control the blade profile loss in the middle area of ​​the moving blade.

[0057] When the total blade height H is greater than 120mm and less than or equal to 300mm, the difference between the relative pitch of the root section and the relative pitch of the middle section is The difference between the relative pitch of the top section and the relative pitch of the middle section is Here, the total blade height H is greater than 120 mm and less than or equal to 300 mm. The basic two-dimensional blade profile section is at the top of the blade body. Its relative pitch is smaller than the relative pitch in the middle of the blade body, but greater than the relative pitch at the root of the blade body, so that the blade body as a whole is more adapted to the aerodynamic requirements of the turbine operation, so as to better control the load distribution in the blade flow channel and reduce the blade profile loss in the middle area.

[0058] Furthermore, by limiting the relative pitch of the root section, the relative pitch of the middle section and the relative pitch of the top section and linking their distribution patterns with the total height H of the blade, it is possible to ensure that the relative pitch of the middle area is gradually increased as the blade height increases, thereby achieving the purpose of effectively controlling the blade profile loss in the middle area of ​​the moving blade.

[0059] Furthermore, the blade outlet geometric angle arcsin (o / t) also includes the root section outlet geometric angle arcsin (o / t) 底 、Geometric angle of the middle section outlet arcsin (o / t) 中 The geometric angle with the top section outlet is arcsin (o / t) 顶 .

[0060] By specifically defining the blade outlet geometry angle arcsin(o / t) as the root section outlet geometry angle arcsin(o / t) 底 、Geometric angle of the middle section outlet arcsin (o / t) 中 The geometric angle with the top section outlet is arcsin (o / t) 顶 It can help construction designers better control the variable value of the outlet geometry angle and refine the outlet geometry angle design plan, so as to effectively reduce the secondary flow loss. At the same time, it can use smooth modeling to reduce the blade loss in the middle area of ​​the moving blade, effectively increase the service life of the moving blade and reduce the cost of use.

[0061] Furthermore, the variation law of the outlet geometric angle of the basic two-dimensional blade profile satisfies the following relationship along the radial direction:

[0062]

[0063] Where H is the total height of the blade.

[0064] Controlling the blade outlet geometric angle according to the total blade height H plays a vital role in ensuring smooth transition of characteristic cross-section, improving aerodynamic performance and reducing blade profile losses.

[0065] By determining the relative grating pitch t / b and the outlet geometric angle, the installation angle can be determined, thereby achieving the purpose of continuous and smooth transition of the basic two-dimensional blade section.

[0066] like Figure 3 As shown in Figure 2, when the total blade height H is less than or equal to 60 mm, the difference between the root section outlet geometry angle and the middle section outlet geometry angle is equal to the difference between the middle section outlet geometry angle and the top section outlet geometry angle, both of which are Here, the total blade height H is less than or equal to 60 mm, which means that the basic two-dimensional blade section is at the bottom of the blade body, that is, the blade root area. The value of the moving blade outlet geometric angle here is relatively smaller, which can effectively increase the inlet and outlet pressure difference of the moving blade in the blade root area, thereby reducing the steam leakage in the static blade area of ​​this level, and effectively reducing the secondary flow loss in the end area.

[0067] When the total blade height is greater than 60 mm and less than or equal to 120 mm, the difference between the root section outlet geometric angle and the middle section outlet geometric angle is The difference between the geometric angle of the middle section outlet and the geometric angle of the top section outlet is Here, the total blade height H is greater than 60 mm and less than or equal to 120 mm, which means that the basic two-dimensional blade profile section is in the middle of the blade body. Here, the outlet geometry angle gradually increases with the blade body height, which can effectively control the blade profile loss in the middle area of ​​the moving blade.

[0068] When the total blade height H is greater than 120 mm and less than or equal to 300 mm, the difference between the root section outlet geometric angle and the middle section outlet geometric angle is The difference between the geometric angle of the middle section outlet and the geometric angle of the top section outlet is Here, the total blade height H is greater than 120 mm and less than or equal to 300 mm, and the basic two-dimensional blade section is at the top of the blade body. The present invention increases the geometric angle of the moving blade outlet in the blade tip area, reduces the inlet and outlet pressure difference of the moving blade in the blade tip area, that is, reduces the steam leakage in the blade tip area, thereby effectively avoiding the leakage fluid between the static and moving parts from mixing with the mainstream in the end area of ​​the turbine moving blade, resulting in a surge in secondary flow losses.

[0069] A turbine moving blade of the present invention includes a blade body 1, which is formed by stacking and twisting a number of basic two-dimensional blade shapes according to a certain rule. The stacked and twisted moving blade itself has a smooth appearance. During use, the twisted structure itself can bring good aerodynamic effects, thereby further optimizing the turbine effect.

[0070] Basic two-dimensional blade section parameters: certain section height h, total blade height H, relative blade height h / H, relative pitch t / b. The above parameters are used to limit the basic two-dimensional blade section, thereby limiting the overall profile of the blade body 1, which can ensure that the present invention is applied to carbon dioxide turbine moving blades of different sizes, has a wide range of applications, a large use space, and good promotion prospects.

[0071] The basic two-dimensional blade section is composed of four closed curves connected in sequence: the leading edge 2, the pressure surface 7, the trailing edge 3, and the suction surface 8. The closed curves are connected and formed to ensure that the lines of the product of the present invention are smooth. During use, the smooth surface lines can also effectively reduce blade losses and improve aerodynamic performance, thereby achieving better economic benefits.

[0072] In the process of shaping, the present invention strictly controls the relative pitch and the outlet geometric angle of the blades by limiting the blade height, thereby achieving a good shaping effect. In the process of assembly and installation, only by rotating the blade profile, adjusting the relative pitch, and fine-tuning the outlet geometric angle, an excellent aerodynamic effect can be achieved, the turbine process of the carbon dioxide turbine unit can proceed smoothly, and the blade loss can be significantly reduced.

[0073] In the present invention, the relative pitch and the installation angle 10 change along the blade height direction according to a specific composite molding rule, so that the geometric angle of each cross-section outlet changes accordingly, thereby controlling the distribution law of the fluid along the blade height direction, transferring the fluid in the high-loss area to the high-efficiency area, improving the blade flow efficiency, and thereby increasing the efficiency of the entire carbon dioxide turbine.

[0074] The turbine moving blade provided by the present invention can be applied not only to turbine units using carbon dioxide as the medium, but also to turbine units using other media. The turbine moving blade provided by the present invention has good performance in reducing blade loss and secondary flow loss, and has broad application prospects.

[0075] It should be noted that the terms "first", "second", etc. in this application are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described here. The orientation or positional relationship indicated by "back", "top", "bottom", "inside", "outside", "middle", "vertical", "horizontal", "lateral", "longitudinal", etc. is based on the orientation or positional relationship shown in the accompanying drawings.

[0076] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein; and these modifications or substitutions do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A turbine moving blade, characterized in that: The invention comprises a blade body (1), wherein the blade body (1) is formed by stacking and twisting a plurality of basic two-dimensional blade profiles, wherein the basic two-dimensional blade profile comprises a basic two-dimensional blade profile section, wherein the basic two-dimensional blade profile section has parameters: a blade total height H and a relative pitch; wherein the relative pitch of the basic two-dimensional blade profile section varies as follows: along the direction of the blade total height H, the relative pitch of the root section gradually increases to the middle section, and the relative pitch of the middle section gradually decreases to the top section; the relative pitch of the root section of the basic two-dimensional blade profile is smaller than the relative pitch of the top section of the basic two-dimensional blade profile, and the relative pitch of the basic two-dimensional blade profile is the ratio of t to b, wherein t represents the pitch (11) and b represents the chord length (9), and the relative pitch of the root section, the relative pitch of the middle section and the relative pitch of the top section vary radially along the following rule: When the total blade height H is less than or equal to 60mm, the difference between the relative pitch of the root section and the relative pitch of the middle section is The difference between the relative pitch of the top section and the relative pitch of the middle section is When the total blade height H is greater than 60mm and less than or equal to 120mm, the difference between the relative pitch of the root section and the relative pitch of the middle section is The difference between the relative pitch of the top section and the relative pitch of the middle section is When the total blade height H is greater than 120mm and less than or equal to 300mm, the difference between the relative pitch of the root section and the relative pitch of the middle section is The difference between the relative pitch of the top section and the relative pitch of the middle section is Where H is the total height of the blade.

2. A turbine moving blade according to claim 1, characterized in that: The basic two-dimensional blade profile section is composed of a leading edge (2), a pressure surface (7), a trailing edge (3), and a suction surface (8) which are connected in sequence.

3. A turbine moving blade according to claim 2, characterized in that: The superposition rule of the basic two-dimensional blade profile sections is that each basic two-dimensional blade profile section transitions continuously and smoothly from the root to the top along the relative blade height.

4. A turbine moving blade according to claim 3, characterized in that: The relative grid pitch distribution law satisfies the following relationship: t / b=Ax 2 +Bx+C Among them, t / b is the relative pitch of the basic two-dimensional blade section at a certain blade height, x is the relative blade height of the basic two-dimensional blade section at a certain blade height, the relative blade height is the ratio of the section height h to the total blade height H, and the values ​​of A, B, and C are related to the total blade height H.

5. A turbine moving blade according to claim 4, characterized in that: The basic two-dimensional blade section also has a parameter: blade outlet geometric angle arcsin (o / t), and the blade outlet geometric angle along arcsin (o / t) relative to the blade height distribution law satisfies the following relationship: arcsin(o / t)=ax 2 +bx+c Among them, arcsin (o / t) is the blade outlet geometric angle of the basic two-dimensional blade section at a certain blade height, and the values ​​of a, b, and c are related to the total blade height H.

6. A turbine moving blade according to claim 5, characterized in that: The blade outlet geometric angle arcsin (o / t) also includes the root section outlet geometric angle arcsin (o / t) 底 、Geometric angle of the middle section outlet arcsin (o / t) 中 The geometric angle with the top section outlet is arcsin (o / t) 顶 .

7. A turbine moving blade according to claim 6, characterized in that: The root section outlet geometric angle arcsin (o / t) 底 、Geometric angle of the middle section outlet arcsin (o / t) 中 The geometric angle with the top section outlet is arcsin (o / t) 顶 The radial changes are as follows: Where H is the total height of the blade.

8. A method for designing a turbine moving blade according to any one of claims 1 to 7, characterized in that: According to the blade height, select the basic two-dimensional blade shape at different relative blade height positions; According to the blade root diameter, number and blade height, determine the variation law of the relative pitch of the basic two-dimensional blade profile at different blade height positions; Determine the blade profile pitch at different blade heights based on the number of blades, root diameter and blade height, and determine the chord length of the basic two-dimensional blade profile at different blade heights; According to the blade root diameter, number and blade height, determine the variation law of blade outlet geometric angle of basic two-dimensional blade profile at different blade height positions; The placement of the blades is adjusted to ensure a continuous and smooth transition of each basic two-dimensional blade cross section.

Images