阅读说明：本技术 一种扇形叶栅叶片及其角度安装方法 (Fan-shaped blade cascade blade and angle installation method thereof ) 是由 王松涛 孙越 陈英杰 王澜 于 2021-08-04 设计创作，主要内容包括：本发明公开了一种扇形叶栅叶片及其角度安装方法,包括叶片、上端壁和下端壁,所述叶片的两端分别卡合连接有上榫头和下榫头,所述上榫头卡合连接于上端壁的一侧,所述下榫头卡合连接于下端壁的一侧,所述叶片呈环形阵列于上端壁和下端壁之间,所述上榫头和下榫头内侧均开设有接口；通过设置上榫头和下榫头,上榫头和下榫头通过接口与叶片的两端进行卡合连接,并且接口与上榫头和下榫头的夹角可根据试验需求生产加工出不同的角度,以便于在试验过程中选择性使用,进而通过更换上榫头和下榫头改变叶片的装配角,便于试验使用,取代了加工多套上、下端壁来改变叶片安装角的方式,大大简化了加工成本和时间成本。(The invention discloses a fan-shaped cascade blade and an angle mounting method thereof, wherein the fan-shaped cascade blade comprises a blade, an upper end wall and a lower end wall, wherein two ends of the blade are respectively connected with an upper tenon and a lower tenon in a clamping manner; through setting up tenon and lower tenon, go up the tenon and carry out the block with the both ends of lower tenon through interface and blade and be connected, and the contained angle of interface and last tenon and lower tenon can be according to experimental demand production processing out different angles, so that the selectivity uses in the experimentation, and then change the assembly angle of blade through more changing tenon and lower tenon, the experimental use of being convenient for, replaced and processed and sheathe in more, the mode that the lower extreme wall changed the blade erection angle, processing cost and time cost have been simplified greatly.)

1. A fan-shaped cascade blade, includes blade (1), upper end wall (2) and lower endwall (3), its characterized in that: the both ends of blade (1) block respectively and are connected with tenon (4) and lower tenon (5), it connects in one side of last end wall (2) to go up tenon (4) block, tenon (5) block is connected in one side of lower end wall (3) down, blade (1) is the annular array between last end wall (2) and lower end wall (3), go up tenon (4) and down tenon (5) inboard and all seted up interface (6), the both ends of blade (1) are located the inboard of interface (6).

2. The fan-shaped cascade blade of claim 1 wherein: the included angle between the interface (6) and the upper tenon (4) and the lower tenon (5) comprises +3 degrees, 0 degrees, -3 degrees, -6.8 degrees and-10 degrees.

3. The fan-shaped cascade blade of claim 1 wherein: the relative inboard of upper end wall (2) and lower terminal wall (3) has all seted up the draw-in groove, the draw-in groove corresponds the cooperation each other with last tenon (4) and lower tenon (5) respectively.

4. The fan-shaped cascade blade of claim 1 wherein: the two ends of the blade (1) are provided with clamping blocks, and the clamping blocks are matched with the interface (6) mutually.

5. The fan-shaped cascade blade and the angle mounting method thereof according to claim 1, wherein: the method comprises the following steps:

step 1: respectively producing an upper end wall (2) and a lower end wall (3) with fixed sizes according to the specification of the required fan-shaped cascade test piece;

step 2: producing and processing a blade (1) with a certain size according to test requirements;

and step 3: producing and processing an upper tenon (4) and a lower tenon (5) for connecting two ends of the blade (1);

and 4, step 4: assembling the blade (1) with the upper end wall (2) and the lower end wall (3) through the upper tenon (4) and the lower tenon (5);

and 5: and connecting the lower end wall (3) with the driving end for testing.

6. The fan-shaped cascade blade and the angle mounting method thereof according to claim 5, wherein: the step 1 comprises the following steps:

step 1.1: designing a clamping groove with a certain size and shape according to the sizes of the upper end wall (2) and the lower end wall (3);

step 1.2: a certain number of clamping grooves are respectively arranged on the opposite inner sides of the upper end wall (2) and the lower end wall (3).

7. The fan-shaped cascade blade and the angle mounting method thereof according to claim 5, wherein: the step 2 comprises the following steps:

step 2.1: designing a blade (1) with a certain size and shape according to test requirements;

step 2.2: clamping blocks with certain sizes and shapes are respectively designed at the two ends of the blade (1);

step 2.3: the blade (1) and the clamping blocks at two ends are produced and processed as a whole.

8. The fan-shaped cascade blade and the angle mounting method thereof according to claim 5, wherein: the step 3 comprises the following steps:

step 3.1: designing an upper tenon (4) and a lower tenon (5) according to the shape and the size of the clamping groove on one side of the upper end wall (2) and the lower end wall (3);

step 3.2: designing interfaces (6) according to the shapes and the sizes of the clamping blocks at the two ends of the blade (1);

step 3.3: the upper tenon (4) and the lower tenon (5) are produced and processed according to the design result;

step 3.4: an interface (6) is arranged on one side of the upper tenon (4) corresponding to one side of the lower tenon (5), and an included angle between the interface (6) and the upper tenon (4) and the lower tenon (5) can be +3 degrees, 0 degrees, 3 degrees, 6.8 degrees and-10 degrees according to test requirements.

9. The fan-shaped cascade blade and the angle mounting method thereof according to claim 5, wherein: the step 4 comprises the following steps:

step 4.1: selecting corresponding upper tenons (4) and lower tenons (5) according to the assembly angle of the blade (1), wherein the included angles between the upper tenons (4) and the interfaces (6) and between the lower tenons (5) and the interfaces (6) meet the assembly conditions of the blade (1);

step 4.2: the upper tenon (4) and the lower tenon (5) are correspondingly clamped and connected with the clamping blocks at the two ends of the blade (1) through the interfaces (6);

step 4.3: then the upper tenon (4) is clamped in the clamping groove at one side of the upper end wall (2), and the lower tenon (5) is clamped in the clamping groove at one side of the lower end wall (3);

step 4.4: and fixing the upper end wall (2) and the lower end wall (3) to form a fan-shaped cascade test piece.

10. The fan-shaped cascade blade and the angle mounting method thereof according to claim 5, wherein: in the step 5, when the angle of the blade (1) needs to be changed, only the upper tenon (4) and the lower tenon (5) at the two ends of the blade (1) need to be correspondingly selected for replacement, and the rest unused upper tenon (4) and the rest unused lower tenon (5) are stored.

Technical Field

The invention belongs to the technical field of fan-shaped cascade blades, and particularly relates to a fan-shaped cascade blade and an angle installation method thereof.

Background

The detailed research on the complex flow field structure and loss mechanism in the cascade flow channel, the exploration of a method for reducing the energy loss in the cascade flow channel and improving the aerodynamic performance of the cascade flow channel become important research contents for improving the performance of the aero-engine. Known from the existing cascade theory and test, the flow in the cascade is very complex, the influence factors are very many, the geometrical factors such as airflow corner and consistency influence pneumatic factors, such as the interference of incoming flow Mach number and shock wave boundary layer, and the like, the mutual interference of airflow wake and blade movement is caused by the staggered arrangement of the rotating blades and the static blades, and the interference influence of viscosity action and shock wave in the flow causes the unsteady and extreme complexity of the flow in the cascade and presents the common rotation and three-dimensional characteristics of the rotating machinery; the basic geometric parameters of the blade cascade comprise blade chord length, grid distance, relative grid distance, blade cascade consistency, blade cascade installation angle, blade cascade outlet angle and the like; the fan-shaped cascade test piece mainly comprises an upper end wall, a lower end wall and blades; wherein, the blade is installed between upper and lower endwalls according to the experimental requirement with certain installation angle.

In a traditional fan-shaped cascade test piece, the installation angle of each set of fan-shaped cascade blades is fixed, and the installation and fixation of the blades and the upper and lower end walls are realized by clamping groove structures processed on the surfaces of the end walls; in the test process, various requirements are often required for the installation angle of the blade; in order to change the installation angle of the blade, a plurality of sets of upper and lower end walls need to be processed at the moment, and the installation angle of the blade is changed by changing the angles of the clamping grooves of the upper and lower end walls; therefore, the processing cost and the time cost are increased, and the occupied space is wasted due to the accumulation of a plurality of sets of grid plates, so that the fan-shaped blade grid blade and the angle installation method thereof are provided.

Disclosure of Invention

The invention aims to overcome the existing defects and provides a fan-shaped cascade blade and an angle installation method thereof so as to solve the problems that the installation angle of each set of fan-shaped cascade blade is fixed, the processing cost and the time cost are high when the installation angle is changed, and a plurality of sets of grid plates are stacked to waste occupied space in the traditional fan-shaped cascade test piece provided in the background art.

In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a fan-shaped cascade blade, includes blade, upper end wall and lower endwall, the both ends difference block of blade is connected with tenon and lower tenon, go up the tenon block and connect in one side of upper end wall, the tenon block is connected in one side of lower endwall down, the blade is the annular array between upper end wall and lower endwall, the interface has all been seted up to upper tenon and lower tenon inboard, the both ends of blade are located the inboard of interface.

Preferably, the angle between the interface and the upper and lower tenons comprises +3 °, 0 °, -3 °, -6.8 °, and-10 °.

Preferably, the relative insides of the upper end wall and the lower end wall are provided with clamping grooves which are respectively matched with the upper tenon and the lower tenon correspondingly.

Preferably, the two ends of the blade are provided with clamping blocks, and the clamping blocks are matched with the interfaces.

A fan-shaped cascade blade and an angle installation method thereof comprise the following steps:

step 1: respectively producing an upper end wall and a lower end wall with fixed sizes according to the specification of the required fan-shaped cascade test piece;

step 2: producing and processing blades with certain sizes according to test requirements;

and step 3: producing and processing an upper tenon and a lower tenon for connecting two ends of the blade;

and 4, step 4: assembling the blade with the upper end wall and the lower end wall through the upper tenon and the lower tenon;

and 5: the lower end wall was attached to the drive end for testing.

Preferably, the step 1 comprises the following steps:

step 1.1: designing a clamping groove with a certain size and shape according to the sizes of the upper end wall and the lower end wall;

step 1.2: a certain number of slots are formed in the opposite inner sides of the upper end wall and the lower end wall, respectively.

Preferably, the step 2 comprises the following steps:

step 2.1: designing a blade with a certain size and shape according to the test requirement;

step 2.2: clamping blocks with certain sizes and shapes are respectively designed at the two ends of the blade;

step 2.3: and the blade and the clamping blocks at the two ends are produced and processed as a whole.

Preferably, the step 3 comprises the following steps:

step 3.1: designing an upper tenon and a lower tenon according to the shape and the size of the clamping grooves on one sides of the upper end wall and the lower end wall;

step 3.2: designing interfaces according to the shapes and the sizes of the clamping blocks at the two ends of the blade;

step 3.3: the upper tenon and the lower tenon are produced and processed according to the design result;

step 3.4: an interface is arranged on one side of the upper tenon and one side of the lower tenon, which correspond to each other, and the included angles between the interface and the upper tenon and the lower tenon can be +3 degrees, 0 degrees, 3 degrees, 6.8 degrees and-10 degrees according to the test requirements.

Preferably, the step 4 comprises the following steps:

step 4.1: selecting corresponding upper tenons and lower tenons according to the assembly angles of the blades, wherein the included angles between the upper tenons and the lower tenons and the interfaces meet the assembly conditions of the blades;

step 4.2: the upper tenon and the lower tenon are correspondingly clamped and connected with the clamping blocks at the two ends of the blade through interfaces respectively;

step 4.3: then the upper tenon is clamped in the clamping groove at one side of the upper end wall, and the lower tenon is clamped in the clamping groove at one side of the lower end wall;

step 4.4: and fixing the upper end wall and the lower end wall to form a fan-shaped cascade test piece.

Preferably, in step 5, when the angle of blade needs to be changed, only need to correspond the last tenon and the lower tenon of selecting blade both ends and change can, accomodate the storage with all the other last tenons that do not use and lower tenon.

Compared with the prior art, the invention provides a fan-shaped cascade blade and an angle installation method thereof, and the fan-shaped cascade blade has the following beneficial effects:

1. according to the invention, the upper tenon and the lower tenon are arranged, the upper tenon and the lower tenon are connected with two ends of the blade in a clamping manner through the interfaces, and included angles among the interfaces, the upper tenon and the lower tenon can be produced and processed into different angles according to test requirements, so that the blade can be selectively used in the test process, and the assembly angle of the blade can be changed by replacing the upper tenon and the lower tenon, so that the test use is facilitated;

2. according to the invention, by arranging the upper tenon and the lower tenon, in the test process, when the angle of the blade needs to be changed, only the upper tenon and the lower tenon at the two ends of the blade need to be correspondingly selected for replacement, and the rest unused upper tenon and the rest unused lower tenon are stored, so that the storage is convenient, and the space occupation is reduced;

3. according to the invention, the blades, the upper end wall and the lower end wall are arranged and are used as standard parts for production and processing, the angle change between the blades and the upper end wall and the lower end wall is converted into the angle change of the upper interfaces of the upper tenons and the lower tenons, and then the upper tenons and the lower tenons only need to be produced and processed in the processing process.

The device has the advantages that the structure is scientific and reasonable, the use is safe and convenient, and great help is provided for people.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention without limiting the invention in which:

FIG. 1 is a schematic view of an assembly structure of a blade and a tenon in a fan-shaped cascade blade and an angle mounting method thereof according to the present invention;

FIG. 2 is a schematic view of an assembly structure of a fan-shaped cascade blade and an angle mounting method thereof according to the present invention;

FIG. 3 is a schematic structural diagram of an upper tenon and a lower tenon in a fan-shaped cascade blade and an angle installation method thereof according to the present invention;

FIG. 4 is a schematic flow chart of a fan-shaped cascade blade and an angle mounting method thereof according to the present invention;

in the figure: the blade comprises a blade 1, an upper end wall 2, a lower end wall 3, an upper tenon 4, a lower tenon 5 and a connector 6.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example one

Referring to fig. 1-3, the present invention provides a technical solution: a fan-shaped cascade blade comprises a blade 1, an upper end wall 2 and a lower end wall 3, wherein two ends of the blade 1 are respectively connected with an upper tenon 4 and a lower tenon 5 in a clamping manner, the upper tenon 4 is connected with one side of the upper end wall 2 in a clamping manner, the lower tenon 5 is connected with one side of the lower end wall 3 in a clamping manner, the blade 1 is arranged between the upper end wall 2 and the lower end wall 3 in an annular array manner, interfaces 6 are respectively arranged on the inner sides of the upper tenon 4 and the lower tenon 5, two ends of the blade 1 are positioned on the inner sides of the interfaces 6, by arranging the upper tenon 4 and the lower tenon 5, the upper tenon 4 and the lower tenon 5 are clamped and connected with the two ends of the blade 1 through the interfaces 6, and the included angles between the interface 6 and the upper tenon 4 and the lower tenon 5 can be produced and processed into different angles according to the test requirements so as to be selectively used in the test process, and then change the assembly angle of blade 1 through changing upper tenon 4 and lower tenon 5, the experimental use of being convenient for.

The working principle and the using process of the invention are as follows: by arranging the blade 1, the upper end wall 2 and the lower end wall 3, the blade 1, the upper end wall 2 and the lower end wall 3 are all used as standard parts for production and processing, the angle change between the blade 1 and the upper end wall 2 and the lower end wall 3 is converted into the angle change of the upper connector 6 of the upper tenon 4 and the lower tenon 5, and then only the upper tenon 4 and the lower tenon 5 need to be produced and processed in the processing process, compared with the traditional method for processing a plurality of sets of end walls, the method greatly reduces the processing cost and the time cost by changing the mounting angle of the blade 1 by changing the slot angle of the end walls, selects the corresponding upper tenon 4 and the corresponding lower tenon 5 according to the mounting angle of the blade 1 during assembly, the included angles between the upper tenon 4 and the lower tenon 5 and the connector 6 meet the assembly condition of the blade 1, and respectively connects the upper tenon 4 and the lower tenon 5 with the corresponding clamping blocks at two ends of the blade 1 through the connector 6 in a clamping way, and then the upper tenon 4 is clamped in the clamping groove on one side of the upper end wall 2, the lower tenon 5 is clamped in the clamping groove on one side of the lower end wall 3, finally, the upper end wall 2 and the lower end wall 3 are fixed, a fan-shaped cascade test piece is formed, in the test process, when the angle of the blade 1 needs to be changed, the upper tenon 4 and the lower tenon 5 at two ends of the blade 1 only need to be correspondingly selected for replacement, and then the assembly angle of the blade 1 is convenient to change, the rest unused upper tenon 4 and the lower tenon 5 are stored, the storage is convenient, and the space occupation is reduced.

Example two

Referring to fig. 1-3, the present invention provides a technical solution: a fan-shaped cascade blade comprises a blade 1, an upper end wall 2 and a lower end wall 3, wherein two ends of the blade 1 are respectively connected with an upper tenon 4 and a lower tenon 5 in a clamping manner, the upper tenon 4 is connected with one side of the upper end wall 2 in a clamping manner, the lower tenon 5 is connected with one side of the lower end wall 3 in a clamping manner, the blade 1 is arranged between the upper end wall 2 and the lower end wall 3 in an annular array manner, interfaces 6 are respectively arranged on the inner sides of the upper tenon 4 and the lower tenon 5, two ends of the blade 1 are positioned on the inner sides of the interfaces 6, by arranging the upper tenon 4 and the lower tenon 5, the upper tenon 4 and the lower tenon 5 are clamped and connected with the two ends of the blade 1 through the interfaces 6, and the included angles between the interface 6 and the upper tenon 4 and the lower tenon 5 can be produced and processed into different angles according to the test requirements so as to be selectively used in the test process, and then change the assembly angle of blade 1 through changing upper tenon 4 and lower tenon 5, the experimental use of being convenient for.

In the invention, preferably, the included angles between the interface 6 and the upper tenon 4 and the lower tenon 5 comprise +3 degrees, 0 degrees, 3 degrees, 6.8 degrees and 10 degrees, and the interfaces 6 with different angles are processed according to the assembly angle of the blade 1 required by the test, so that the interfaces can be selectively used in the test process.

In the invention, preferably, the opposite inner sides of the upper end wall 2 and the lower end wall 3 are both provided with a clamping groove, and the clamping grooves are respectively matched with the upper tenon 4 and the lower tenon 5 correspondingly, so that the upper tenon 4 and the lower tenon 5 are respectively connected with the upper end wall 2 and the lower end wall 3 in a clamping manner.

In the present invention, preferably, the two ends of the blade 1 are both provided with the fixture blocks, and the fixture blocks and the interface 6 are mutually matched, so that the blade 1 is connected with the interface 6 through the fixture blocks at the two ends.

The working principle and the using process of the invention are as follows: the blade 1, the upper end wall 2 and the lower end wall 3 are arranged, the blade 1, the upper end wall 2 and the lower end wall 3 are used as standard parts for production and processing, the angle change between the blade 1 and the upper end wall 2 and the lower end wall 3 is converted into the angle change of the upper connector 6 of the upper tenon 4 and the lower tenon 5, and then only the upper tenon 4 and the lower tenon 5 need to be produced and processed in the processing process, according to the test requirement, the included angle between the connector 6 and the upper tenon 4 and the lower tenon 5 can be +3 degrees, 0 degrees, -3 degrees, -6.8 degrees and-10 degrees, so as to be selectively used, the assembly angle of the blade 1 is changed by replacing the upper tenon 4 and the lower tenon 5, compared with the traditional method for processing a plurality of sets of end walls, the installation angle of the blade 1 is changed by changing the clamping groove angle of the end walls, the processing cost and the time cost are greatly reduced, during assembly, the corresponding upper tenon 4 and the lower tenon 5 are selected according to the assembly angle of the blade 1, the included angle between the upper tenon 4 and the lower tenon 5 and the interface 6 meets the assembly condition of the blade 1, the upper tenon 4 and the lower tenon 5 are correspondingly clamped and connected with the clamping blocks at the two ends of the blade 1 through the interface 6 respectively, the upper tenon 4 is clamped in the clamping groove at one side of the upper end wall 2, the lower tenon 5 is clamped in the clamping groove at one side of the lower end wall 3, and finally the upper end wall 2 and the lower end wall 3 are fixed to form a fan-shaped cascade test piece, in the test process, when the angle of the blade 1 needs to be changed, only the upper tenon 4 and the lower tenon 5 at the two ends of the blade 1 need to be correspondingly selected for replacement, and then be convenient for change the assembly angle of blade 1, accomodate the storage with all the other unused tenon 4 and lower tenon 5, be convenient for accomodate, reduced the space and taken.

EXAMPLE III

Referring to fig. 1-4, the present invention provides a technical solution: a fan-shaped cascade blade comprises a blade 1, an upper end wall 2 and a lower end wall 3, wherein two ends of the blade 1 are respectively connected with an upper tenon 4 and a lower tenon 5 in a clamping manner, the upper tenon 4 is connected with one side of the upper end wall 2 in a clamping manner, the lower tenon 5 is connected with one side of the lower end wall 3 in a clamping manner, the blade 1 is arranged between the upper end wall 2 and the lower end wall 3 in an annular array manner, interfaces 6 are respectively arranged on the inner sides of the upper tenon 4 and the lower tenon 5, two ends of the blade 1 are positioned on the inner sides of the interfaces 6, by arranging the upper tenon 4 and the lower tenon 5, the upper tenon 4 and the lower tenon 5 are clamped and connected with the two ends of the blade 1 through the interfaces 6, and the included angles between the interface 6 and the upper tenon 4 and the lower tenon 5 can be produced and processed into different angles according to the test requirements so as to be selectively used in the test process, and then change the assembly angle of blade 1 through changing upper tenon 4 and lower tenon 5, the experimental use of being convenient for.

In the invention, preferably, the included angles between the interface 6 and the upper tenon 4 and the lower tenon 5 comprise +3 degrees, 0 degrees, 3 degrees, 6.8 degrees and 10 degrees, and the interfaces 6 with different angles are processed according to the assembly angle of the blade 1 required by the test, so that the interfaces can be selectively used in the test process.

In the invention, preferably, the opposite inner sides of the upper end wall 2 and the lower end wall 3 are both provided with a clamping groove, and the clamping grooves are respectively matched with the upper tenon 4 and the lower tenon 5 correspondingly, so that the upper tenon 4 and the lower tenon 5 are respectively connected with the upper end wall 2 and the lower end wall 3 in a clamping manner.

In the present invention, preferably, the two ends of the blade 1 are both provided with the fixture blocks, and the fixture blocks and the interface 6 are mutually matched, so that the blade 1 is connected with the interface 6 through the fixture blocks at the two ends.

A fan-shaped cascade blade and an angle installation method thereof comprise the following steps:

step 1: respectively producing an upper end wall 2 and a lower end wall 3 with fixed sizes according to the specification of a required fan-shaped cascade test piece;

step 2: producing and processing a blade 1 with a certain size according to test requirements;

and step 3: producing and processing an upper tenon 4 and a lower tenon 5 for connecting two ends of the blade 1;

and 4, step 4: assembling the blade 1 with the upper end wall 2 and the lower end wall 3 through the upper tenon 4 and the lower tenon 5;

and 5: the lower end wall 3 was attached to the drive end for testing.

In the present invention, preferably, step 1 comprises the steps of:

step 1.1: designing a clamping groove with a certain size and shape according to the sizes of the upper end wall 2 and the lower end wall 3;

step 1.2: a number of pockets are provided in the opposite inner sides of the upper end wall 2 and the lower end wall 3, respectively.

In the present invention, preferably, step 2 includes the steps of:

step 2.1: designing a blade 1 with a certain size and shape according to test requirements;

step 2.2: clamping blocks with certain sizes and shapes are respectively designed at two ends of the blade 1;

step 2.3: the blade 1 and the clamping blocks at two ends are produced and processed as a whole.

In the present invention, preferably, step 3 includes the steps of:

step 3.1: designing an upper tenon 4 and a lower tenon 5 according to the shape and the size of the clamping grooves on one sides of the upper end wall 2 and the lower end wall 3;

step 3.2: designing an interface 6 according to the shape and the size of the clamping blocks at the two ends of the blade 1;

step 3.3: the upper tenon 4 and the lower tenon 5 are produced and processed according to the design result;

step 3.4: an interface 6 is arranged on one side of the upper tenon 4 and one side of the lower tenon 5 which correspond to each other, and the included angle between the interface 6 and the upper tenon 4 and the lower tenon 5 can be +3 degrees, 0 degrees, -3 degrees, -6.8 degrees and-10 degrees according to the test requirement.

In the present invention, preferably, step 4 includes the steps of:

step 4.1: selecting the corresponding upper tenon 4 and the lower tenon 5 according to the assembly angle of the blade 1, wherein the included angle between the upper tenon 4 and the lower tenon 5 and the interface 6 meets the assembly condition of the blade 1;

step 4.2: the upper tenon 4 and the lower tenon 5 are correspondingly clamped and connected with the clamping blocks at the two ends of the blade 1 through the interfaces 6 respectively;

step 4.3: then the upper tenon 4 is clamped in the clamping groove at one side of the upper end wall 2, and the lower tenon 5 is clamped in the clamping groove at one side of the lower end wall 3;

step 4.4: the upper end wall 2 and the lower end wall 3 are fixed to each other to form a fan-shaped cascade test piece.

In the present invention, preferably, in step 5, when the angle of the blade 1 needs to be changed, only the upper tenon 4 and the lower tenon 5 at the two ends of the blade 1 need to be correspondingly selected for replacement, and the rest of the unused upper tenon 4 and the unused lower tenon 5 are stored.

The working principle and the using process of the invention are as follows: when the fan-shaped blade lattice testing piece is used, the upper end wall 2 and the lower end wall 3 with fixed sizes are respectively produced according to the specification of a required fan-shaped blade lattice testing piece, clamping grooves with certain sizes and shapes are designed according to the sizes of the upper end wall 2 and the lower end wall 3, a certain number of clamping grooves are respectively arranged on the opposite inner sides of the upper end wall 2 and the lower end wall 3 according to a design result, the blade 1 with certain sizes and shapes is designed according to the testing requirement, clamping blocks with certain sizes and shapes are respectively arranged at the two ends of the blade 1, the blade 1 and the clamping blocks at the two ends are integrally produced and processed, then the upper tenon 4 and the lower tenon 5 are designed according to the shapes and sizes of the clamping grooves at one sides of the upper end wall 2 and the lower end wall 3, the interface 6 is designed according to the shapes and sizes of the clamping blocks at the two ends of the blade 1, the upper tenon 4 and the lower tenon 5 are produced and processed according to the design result, the interface 6 is arranged at one side where the upper tenon 4 and the lower tenon 5 correspond to each other, and according to the test requirements, the included angle between the interface 6 and the upper tenon 4 and the lower tenon 5 can be +3 degrees, 0 degrees, -3 degrees, -6.8 degrees and-10 degrees so as to be selectively used, compared with the traditional method for processing a plurality of sets of end walls, the method greatly reduces the processing cost and the time cost by changing the installation angle of the blade 1 by changing the slot angle of the end wall, selects the corresponding upper tenon 4 and the lower tenon 5 according to the assembly angle of the blade 1 during assembly, ensures that the included angle between the upper tenon 4 and the interface 6 and the included angle between the lower tenon 5 and the interface 6 meet the assembly conditions of the blade 1, correspondingly clamps and connects the upper tenon 4 and the lower tenon 5 with the clamping blocks at the two ends of the blade 1 through the interface 6 respectively, clamps the upper tenon 4 in the slot at one side of the upper end wall 2, clamps the lower tenon 5 in the slot at one side of the lower end wall 3, and finally fixes the upper end wall 2 and the lower end wall 3, form fan-shaped cascade test piece, in the test process, when needs change blade 1's angle, only need correspond the last tenon 4 and lower tenon 5 of selecting blade 1 both ends change can, and then be convenient for change blade 1's assembly angle, accomodate all the other unused last tenon 4 and lower tenon 5 and deposit, be convenient for accomodate, reduced the space and occupy.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.