Adjustable stator blade angle judgment method and system

Abstract

The invention belongs to the technical field of engines, and provides an adjustable stator blade angle judgment method and system, and the method comprises the steps: enabling an adjustable stator blade to rotate to a designated state around a rotating shaft, metering the blade profile point cloud data of the adjustable stator blade at a set height, and forming a blade profile actual measurement curve; obtaining design parameters and a set threshold value of the adjustable stator blade, determining theoretical blade profile point cloud data of the adjustable stator blade at a set height and in a specified state, and forming a blade profile theoretical curve; drawing a parameter large circle based on the theoretical blade profile point cloud data; drawing a datum line and an actual measurement line; and calculating deviation angles between the plurality of actual measurement lines and the datum line, and judging the mounting angle of the adjustable stator blade by combining a set threshold value. According to the method, the local measurement blade profile data and the theoretical blade profile data of the adjustable stator blade are combined, the intersection points and the intersection point connecting lines are generated with the parameter large circle, and therefore the deviation angle of each adjustable stator blade is obtained, the calculation efficiency is improved, and complete high-precision angle calculation is achieved.

Description

Technical Field

[0001] The present invention belongs to the technical field of engines, and in particular relates to a method and system for determining an angle of an adjustable stator blade. Background Art

[0002] The angular opening of the adjustable stator blades of a compressor is closely related to the surge margin and performance. Due to factors such as processing deviation and assembly deviation in actual engineering, there will be certain deviations in the adjustable stator blade angle. Therefore, it is necessary to measure the adjustable stator blade angle during assembly and determine whether the adjustable stator blade angle is qualified.

[0003] In the angle measurement of adjustable stator blades, the current mainstream angle measurement processing methods of adjustable stator blades are divided into two categories, namely the chord method and the circle fitting method, but both rely on complete blade contour data (including the blade basin and blade back), and need to calculate the angle deviation by fitting the leading and trailing edge circles or constructing a complete chord; however, in actual working conditions, it is often impossible to collect full-circle data due to limited blade installation space, measurement obstruction (such as adjacent blades, casing obstruction) or incomplete data collection (such as only local contour points can be obtained). For example, in the assembled state of a multi-stage compressor blade assembly, the blades are densely arranged, resulting in the measurement equipment being unable to collect data around the entire circle; resulting in the failure of traditional processing methods for measurement data, which directly affects the efficiency of online calibration or maintenance decisions.

[0004] In view of this, overcoming the defects of the above-mentioned prior art is an urgent problem to be solved in this technical field. Summary of the Invention

[0005] In view of the above problems, the present invention proposes a method for determining the angle of an adjustable stator blade, comprising the following steps:

[0006] When the adjustable stator blades are assembled to the assembly, the adjustable stator blades are rotated to a specified state around the rotation axis, and the blade profile point cloud data of multiple adjustable stator blades in the same row at the set height are measured in sequence. The blade profile point cloud data are imported into CAD for benchmark unification to form multiple blade profile measured curves;

[0007] Obtain the design parameters and set thresholds of the adjustable stator blade, determine the theoretical blade profile point cloud data of the adjustable stator blade at the set height and specified state, import the theoretical blade profile point cloud data into CAD, and unify the benchmark with the blade profile point cloud data to form a theoretical blade profile curve;

[0008] Draw a parametric great circle in CAD based on theoretical blade point cloud data;

[0009] Drawing a reference line based on the intersection of the blade theoretical curve and the parameter great circle, and drawing multiple measured lines based on the intersection of multiple blade measured curves and the parameter great circle;

[0010] The deviation angles between multiple measured lines and the baseline are calculated, and the installation angle of the adjustable stator blades is determined based on the set threshold.

[0011] Furthermore, the state is designated as a design state or a closed state;

[0012] The design state indicates that the angle of the adjustable stator blade is adjusted to 0°;

[0013] The closed state indicates that the angle of the adjustable stator blade is adjusted to the fully closed angle.

[0014] Furthermore, before importing the blade profile point cloud data into CAD, the method further includes: filtering and denoising the measured blade profile point cloud data.

[0015] Furthermore, multiple blade profile measured curves are generated, including:

[0016] When the blade profile point cloud data covers less than 30% of the blade area of ​​the adjustable stator blade, it is determined that the data points are insufficient, and the blade profile measured curve is formed by cubic spline interpolation or Bezier curve fitting.

[0017] Furthermore, the theoretical blade point cloud data is imported into CAD for benchmark unification to form the blade theoretical curve, including:

[0018] Import theoretical blade point cloud data into CAD;

[0019] When it is determined that the measured blade profile point cloud data contains a normal vector, the theoretical blade profile point cloud data is offset by the same distance along the normal direction to obtain the theoretical blade profile correction point cloud data;

[0020] The benchmark is unified based on the theoretical blade shape correction point cloud data to form the theoretical blade shape theoretical curve.

[0021] Furthermore, drawing a parametric great circle in CAD based on theoretical blade point cloud data includes:

[0022] Obtaining point cloud data of the rotation axis of the theoretical blade profile and the chord length of the theoretical blade profile;

[0023] Import the point cloud data of the rotation axis into CAD and use the point cloud data of the rotation axis as the center of the parameter great circle;

[0024] The diameter of the parameter great circle is less than or equal to the chord length of the theoretical blade profile, and the diameter of the parameter great circle is greater than 50% of the chord length of the theoretical blade profile.

[0025] Furthermore, judging whether the installation angle of the adjustable stator blade is qualified or unqualified in combination with the set threshold includes:

[0026] Based on the design drawings of the adjustable stator blades, an upper limit of the deviation of the adjustable stator blade angle is obtained as a set threshold.

[0027] When the deviation angle is greater than or equal to the set threshold, the installation angle of the adjustable stator blade is judged to be unqualified;

[0028] When the deviation angle is less than the set threshold, it is determined that the installation angle of the adjustable stator blade is qualified.

[0029] The present invention proposes an adjustable stator blade angle judgment system, comprising:

[0030] The first acquisition unit is configured to rotate the adjustable stator blades to a specified state around the rotation axis when the adjustable stator blades are assembled to the assembly, sequentially measure blade profile point cloud data of multiple adjustable stator blades in the same row at a set height, import the blade profile point cloud data into a CAD system for benchmark unification, and form multiple blade profile measured curves;

[0031] The second acquisition unit is used to obtain the design parameters and set thresholds of the adjustable stator blade, determine the theoretical blade profile point cloud data of the adjustable stator blade at the set height and specified state, import the theoretical blade profile point cloud data into the CAD, and unify the benchmark with the blade profile point cloud data to form a blade profile theoretical curve;

[0032] A drawing unit for drawing a parametric great circle in CAD based on theoretical blade point cloud data;

[0033] A line construction unit is used to draw a reference line based on the intersection of the blade theoretical curve and the parameter great circle, and to draw multiple measured lines based on the intersection of multiple blade measured curves and the parameter great circle;

[0034] The data processing unit is used to calculate the deviation angles between multiple measured lines and the baseline, and determine the installation angle of the adjustable stator blades based on the set threshold.

[0035] Furthermore, the state is designated as a design state or a closed state;

[0036] The design state indicates that the angle of the adjustable stator blade is adjusted to 0°;

[0037] The closed state indicates that the angle of the adjustable stator blade is adjusted to the fully closed angle.

[0038] Furthermore, the mapping unit is specifically used to:

[0039] Obtaining point cloud data of the rotation axis of the theoretical blade profile and the chord length of the theoretical blade profile;

[0040] Import the point cloud data of the rotation axis into CAD and use the point cloud data of the rotation axis as the center of the parameter great circle;

[0041] The diameter of the parameter great circle is less than or equal to the chord length of the theoretical blade profile, and the diameter of the parameter great circle is greater than 50% of the chord length of the theoretical blade profile.

[0042] Compared with the prior art, the embodiments of the present invention have at least the following advantages:

[0043] The method for judging the angle of an adjustable stator blade of the present invention combines the local metered blade profile data of the adjustable stator blade with the theoretical blade profile data, generates intersection points and connecting lines with the parameter great circle, thereby obtaining the deviation angle of each adjustable stator blade, avoiding the complicated curve fitting process, thereby evaluating the degree of deviation and dispersion of each adjustable blade angle, replacing the traditional leading and trailing edge fitting and chord line method, and significantly improving the calculation efficiency. On the basis of the local metered blade profile data of the adjustable stator blade, the method realizes the angle judgment of the adjustable stator blade and realizes the calculation of the complete high-precision angle, effectively solving the problem of difficulty in obtaining complete blade profile data in the assembled state, and improving the efficiency of online calibration or maintenance decision-making.

[0044] Other features and advantages of the present invention will be described in the following description, and in part will become apparent from the description, or will be 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 and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to 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 any creative work.

[0046] Figure 1 A schematic flow chart of a method for determining an angle of an adjustable stator blade according to an embodiment of the present invention is shown;

[0047] Figure 2 A schematic diagram of a measured blade profile curve in a design state according to an embodiment of the present invention is shown;

[0048] Figure 3 A schematic diagram of a measured blade profile curve in a closed state according to an embodiment of the present invention is shown;

[0049] Figure 4 A schematic diagram of a baseline in a closed state according to an embodiment of the present invention is shown;

[0050] Figure 5 It shows a schematic diagram of a measured line in a closed state according to an embodiment of the present invention;

[0051] Figure 6 A schematic diagram showing a combination of a measured line and a reference line in a closed state according to an embodiment of the present invention is shown;

[0052] Figure 7A schematic diagram of the partial structure of the compressor is shown;

[0053] Figure 8 A block diagram of an adjustable stator blade angle determination system in an embodiment of the present invention is shown.

[0054] In the figure, 1-guide vane, 2-rotor, 3-adjustable stator blade. DETAILED DESCRIPTION

[0055] The following description provides many different embodiments or examples for implementing different features of the present invention. The components and arrangements described in the following specific examples are only used to simplify the present invention and are only used as examples, not to limit the present invention.

[0056] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only 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 making creative efforts shall fall within the scope of protection of the present invention.

[0057] It should be noted that in Figure 7 In the example shown, the compressor is provided with adjustable guide vanes 1, rotor 2 and adjustable stator blades 3 in sequence. The adjustable stator blades 3 of a conventional compressor include one-stage adjustable, two-stage adjustable, three-stage adjustable, four-stage adjustable, etc. In this embodiment, one-stage adjustable is taken as an example for explanation. One-stage adjustable means several adjustable stator blades 3 in the same row at the first-stage position. The number of adjustable stator blades 3 in the same row is determined according to design requirements, and can be 16, 18, etc.

[0058] The present invention provides a method for determining the angle of an adjustable stator blade. Figure 1 FIG2 shows a flow chart of a method for determining an angle of an adjustable stator blade in an embodiment of the present invention. Figure 1 In the method for determining the angle of the adjustable stator blade, the method comprises the following steps:

[0059] S101, with the adjustable stator blades assembled to the assembly, rotating the adjustable stator blades around the rotation axis to a specified state, sequentially measuring blade profile point cloud data of multiple adjustable stator blades in the same row at a set height, importing the blade profile point cloud data into a CAD program for benchmark unification, and generating multiple blade profile measured curves;

[0060] It should be noted that the designated state is the design state or the closed state, refer to Figure 2 , the design state represents the state of adjusting the adjustable stator blade angle to 0°; Figure 3The closed state indicates that the angle of the adjustable stator blade is adjusted to the fully closed angle.

[0061] At the same time, each row of adjustable stator blades is conventionally equipped with an angle dial and a pointer, and the adjustable stator blades corresponding to the design state and the closed state have pin holes. When the pointer points to the design angle or the closed angle of the dial, or when the pin holes of the corresponding angle are confirmed to be aligned with the inner and outer rings by inserting the pin, it indicates that the predetermined angle state has been reached, that is, the design state or the closed state, and then the angle of the adjustable stator blade is determined, as well as the angle corresponding to the blade point cloud data.

[0062] This embodiment takes the designated state as the off state as an example to illustrate the following steps.

[0063] In addition, before importing the blade point cloud data into CAD, the method further includes: filtering and denoising the measured blade point cloud data. For example, high-frequency noise is removed by Gaussian filtering, and outliers are eliminated by median filtering.

[0064] In the process of sequentially measuring multiple adjustable stator blades in the same row, the complete blade profile of the adjustable stator blade cannot be measured due to interference in the measurement of component status, but the measurement range must cover as many blade profile areas as possible. When the area of ​​the adjustable stator blade covered by the measurement is greater than 30% of the blade body area of ​​the adjustable stator blade, the data point requirements are met to ensure the accuracy of the subsequent drawing of the blade profile measurement curve.

[0065] However, when the blade point cloud data covers less than 30% of the blade area of ​​the adjustable stator blade, it is determined that the data points are insufficient, and cubic spline interpolation or Bezier curve fitting is used to form the blade profile measured curve. The missing area data is supplemented by interpolation or projection to generate virtual contour points, thereby generating virtual intersection points and intersection lines to fit the blade profile measured curve.

[0066] S102, obtaining design parameters and set thresholds of the adjustable stator blade, determining theoretical blade profile point cloud data of the adjustable stator blade at a set height and in a specified state, importing the theoretical blade profile point cloud data into CAD, performing benchmark unification with the blade profile point cloud data, and forming a theoretical blade profile curve;

[0067] Wherein, based on the design drawing of the adjustable stator blade, the upper limit of the deviation of the adjustable stator blade angle is obtained as the set threshold.

[0068] In addition, it should be noted that in the actual measurement process, if the normal vector operation is omitted due to operational errors or other situations, the measured blade point cloud data will be misaligned with the theoretical blade point cloud data.

[0069] Correspondingly, the method of importing the theoretical blade point cloud data into CAD to perform benchmark unification to form the blade theoretical curve specifically includes:

[0070] After the theoretical blade point cloud data is imported into CAD;

[0071] When it is determined that the blade profile point cloud data contains a normal vector, the theoretical blade profile point cloud data is offset by the same distance along the normal direction to obtain theoretical blade profile correction point cloud data;

[0072] Based on the theoretical blade shape correction point cloud data, the benchmark is unified to form the theoretical blade shape theoretical curve. Figure 4 In the example shown, a state in which the blade profile theoretical curve is normal-biased in a closed state is shown.

[0073] If it is determined that the blade profile point cloud data does not contain a normal vector, benchmark unification is performed directly based on the theoretical blade profile point cloud data to form a theoretical blade profile curve.

[0074] To ensure the consistency of the measurement data and the coordinate system of theoretical design.

[0075] S103, drawing a parameter great circle in CAD based on the theoretical blade point cloud data, specifically including:

[0076] Obtaining point cloud data of the rotation axis of the theoretical blade profile and the chord length of the theoretical blade profile;

[0077] Import the point cloud data of the rotating shaft into CAD, and determine the center of the parameter great circle based on the point cloud data of the rotating shaft. For example, when the length of the rotating shaft in the X-axis direction is m, the coordinates of the center of the parameter great circle are determined to be (m, 0), where 0 means that the blade profiles of the aerodynamic design are all at 0° in the circumferential direction.

[0078] Correspondingly, in the actual operation process, the diameter of the parameter great circle is adjusted according to the integrity of the measured blade point cloud data; on the basis that the diameter of the parameter great circle is less than or equal to the chord length of the theoretical blade profile and the diameter of the parameter great circle is greater than 50% of the chord length of the theoretical blade profile, the maximum distance from the blade point cloud data to the center of the parameter great circle is selected as the radius of the parameter great circle to improve the accuracy of subsequent drawing of baselines, measured lines and calculation of deviation angles.

[0079] The great circle of guarantee parameters intersects with the theoretical blade curve and the measured blade curve.

[0080] S104, drawing a reference line L1 based on the intersection of the blade profile theoretical curve and the parameter great circle, and drawing multiple measured lines L2 based on the intersection of multiple blade profile measured curves and the parameter great circle;

[0081] refer to Figure 4 、 Figure 5 This embodiment takes the closed state as an example to illustrate the following steps: Figure 4The reference line L1 drawn based on the intersection of the blade theoretical curve and the parameter great circle is shown. Figure 5 A measured line L2 is shown which is drawn based on the intersection of a measured blade profile curve and a parameter great circle.

[0082] S105 , calculating the deviation angles between the plurality of measured lines L2 and the reference line L1 , and determining the installation angle of the adjustable stator blades in combination with a set threshold.

[0083] exist Figure 6 In the example shown, after the measured line L2, the reference line L1, and the parameter great circle are drawn, the deviation angle α between the measured line L2 and the reference line L1 is obtained.

[0084] Correspondingly, when the deviation angle α is greater than or equal to the set threshold, it is judged that the installation angle of the adjustable stator blade is unqualified;

[0085] When the deviation angle α is less than the set threshold, it is determined that the installation angle of the adjustable stator blade is qualified.

[0086] During actual operation, the deviation angles α between multiple measured lines L2 and the baseline L1 are calculated, and the mean and standard deviation of each deviation angle α are further calculated. The arithmetic mean of the deviation angles α is defined as the comprehensive deviation angle of the adjustable stator blade angle for that stage. The comprehensive deviation angle represents the overall deviation of the blade angle, while the standard deviation of the deviation angle represents the dispersion of the blade angle.

[0087] By introducing the comprehensive deviation angle and its variance standard deviation and combining it with the threshold judgment criterion, the installation angle of the adjustable stator blade can be further judged.

[0088] For example, a row of 16 adjustable stator blades is taken as an example for description.

[0089] Table 1 Processing results of each blade metering data

[0090]

[0091]

[0092] Referring to Table 1, the deviation angles α between the measured lines and the reference line of the 16 adjustable stator blades are 0.286°, 0.303°, -0.711°, -0.186°, 0.079°, -0.261°, -0.023°, -0.477°, -0.196°, 0.8°, 0.263°, 0.046°, 0.065°, 0.017°, -0.273°, and 0.015°, respectively.

[0093] The corresponding set threshold is obtained as ±1°. It can be seen that the average deviation angle between the adjustable stator blade and the theoretical blade profile is small, and the deviation angle is within ±1°. The standard deviation of the variance is also small, which meets the design requirements.

[0094] Compared with traditional methods that rely more on data integrity and require the collection of complete or nearly complete contour points, the judgment method of this application combines the local metered blade profile data of the adjustable static blade with the theoretical blade profile data, and generates intersection points and intersection lines with the parameter great circle to obtain the deviation angle of each adjustable static blade, thereby evaluating the degree of deviation and dispersion of each adjustable blade angle, replacing the traditional leading and trailing edge fitting and chord line method.

[0095] In practice, on the basis of measuring the area of ​​the adjustable stator blade that is larger than the local area of ​​the adjustable stator blade body, the angle judgment of the adjustable stator blade can be realized, and the calculation of the complete high-precision angle can be realized. In the case of limited blade point cloud data, the angle deviation value can be quickly obtained, which improves the efficiency of online calibration or maintenance decision-making; and can be further combined with the multi-dimensional deviation method of the deviation angle mean, variance, and standard deviation to realize the accurate identification of unqualified blades.

[0096] Although the above description is based on the example of the designated state being the closed state, the present invention is not limited thereto. When the designated state is the design state, the corresponding:

[0097] Obtain the baseline L1, multiple measured lines L2, and parameter great circles under the design state;

[0098] Similarly, the deviation angles between the multiple measured lines L2 and the reference line L1 are calculated, and the installation angle of the adjustable stator blade is determined in combination with the set threshold.

[0099] Those skilled in the art may make comprehensive considerations based on the judgment principles of the present invention and actual application situations, as long as the principles of the present invention can be implemented.

[0100] In addition, reference Figure 8 The present invention also discloses an adjustable stator blade angle judgment system, comprising:

[0101] The first acquisition unit is configured to rotate the adjustable stator blades to a specified state around the rotation axis when the adjustable stator blades are assembled to the assembly, sequentially measure blade profile point cloud data of multiple adjustable stator blades in the same row at a set height, import the blade profile point cloud data into a CAD system for benchmark unification, and form multiple blade profile measured curves;

[0102] The second acquisition unit is used to obtain the design parameters and set thresholds of the adjustable stator blade, determine the theoretical blade profile point cloud data of the adjustable stator blade at the set height and specified state, import the theoretical blade profile point cloud data into the CAD, and unify the benchmark with the blade profile point cloud data to form a blade profile theoretical curve;

[0103] A drawing unit for drawing a parametric great circle in CAD based on theoretical blade point cloud data;

[0104] A line construction unit is used to draw a reference line L1 based on the intersection of the blade theoretical curve and the parameter great circle, and to draw multiple measured lines L2 based on the intersection of multiple blade measured curves and the parameter great circle;

[0105] The data processing unit is used to calculate the deviation angles between the multiple measured lines L2 and the reference line L1, and determine the installation angle of the adjustable stator blades based on the set threshold.

[0106] In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features indicated. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the specified features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0107] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical, electrical, or intercommunication connections; direct or indirect connections through an intermediary; and may encompass internal connectivity between multiple components or interactions between multiple components. Those skilled in the art will understand the specific meanings of these terms in the present invention based on specific circumstances.

[0108] In the description of the present invention, it should be understood that all terms used to indicate orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and cannot be understood as a limitation on the present invention.

[0109] 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 replacements for some of the technical features therein; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for determining the angle of an adjustable stator blade, characterized in that: The following steps are involved: When the adjustable stator blades are assembled to the assembly, the adjustable stator blades are rotated to a specified state around the rotation axis, and the blade profile point cloud data of multiple adjustable stator blades in the same row at the set height are measured in sequence. The blade profile point cloud data are imported into CAD for benchmark unification to form multiple blade profile measured curves; Obtain the design parameters and set thresholds of the adjustable stator blade, determine the theoretical blade profile point cloud data of the adjustable stator blade at the set height and specified state, import the theoretical blade profile point cloud data into CAD, and unify the benchmark with the blade profile point cloud data to form a theoretical blade profile curve; Draw a parametric great circle in CAD based on theoretical blade point cloud data; Drawing a reference line based on the intersection of the blade theoretical curve and the parameter great circle, and drawing multiple measured lines based on the intersection of multiple blade measured curves and the parameter great circle; The deviation angles between multiple measured lines and the baseline are calculated, and the installation angle of the adjustable stator blades is determined based on the set threshold.

2. The method for determining the angle of an adjustable stator blade according to claim 1, characterized in that: The designated state is a design state or a closed state; The design state represents a state in which the angle of the adjustable stator blade is adjusted to 0°; The closed state refers to a state in which the angle of the adjustable stator blade is adjusted to a fully closed angle.

3. The method for determining the angle of an adjustable stator blade according to claim 1, characterized in that: Before importing the blade profile point cloud data into the CAD, the method further includes: filtering and denoising the measured blade profile point cloud data.

4. The method for determining the angle of an adjustable stator blade according to claim 3, characterized in that: The forming of a plurality of blade profile measured curves includes: When the blade point cloud data covers less than 30% of the area of ​​the adjustable stator blade, it is determined that the data points are insufficient, and a blade profile measured curve is formed by cubic spline interpolation or Bezier curve fitting.

5. The method for determining the angle of an adjustable stator blade according to claim 1, characterized in that: The method of importing the theoretical blade point cloud data into CAD to perform benchmark unification to form the blade theoretical curve specifically includes: Import theoretical blade point cloud data into CAD; When it is determined that the measured blade profile point cloud data contains a normal vector, the theoretical blade profile point cloud data is offset by the same distance along the normal direction to obtain the theoretical blade profile correction point cloud data; The benchmark is unified based on the theoretical blade shape correction point cloud data to form the theoretical blade shape theoretical curve.

6. The method for determining the angle of an adjustable stator blade according to claim 1, characterized in that: Drawing a parameter great circle in CAD based on theoretical blade point cloud data includes: Obtaining point cloud data of the rotation axis of the theoretical blade profile and the chord length of the theoretical blade profile; Import the point cloud data of the rotation axis into CAD and use the point cloud data of the rotation axis as the center of the parameter great circle; The diameter of the parameter great circle is less than or equal to the chord length of the theoretical blade profile, and the diameter of the parameter great circle is greater than 50% of the chord length of the theoretical blade profile.

7. The method for determining the angle of an adjustable stator blade according to claim 1, characterized in that: The determination of whether the adjustable stator blade installation angle is qualified or unqualified in combination with the set threshold value includes: Based on the design drawings of the adjustable stator blades, an upper limit of the deviation of the adjustable stator blade angle is obtained as a set threshold. When the deviation angle is greater than or equal to the set threshold, the installation angle of the adjustable stator blade is judged to be unqualified; When the deviation angle is less than the set threshold, it is determined that the installation angle of the adjustable stator blade is qualified.

8. An adjustable stator blade angle judgment system, characterized in that: include: The first acquisition unit is configured to rotate the adjustable stator blades to a specified state around the rotation axis when the adjustable stator blades are assembled to the assembly, sequentially measure blade profile point cloud data of multiple adjustable stator blades in the same row at a set height, import the blade profile point cloud data into a CAD system for benchmark unification, and form multiple blade profile measured curves; The second acquisition unit is used to obtain the design parameters and set thresholds of the adjustable stator blade, determine the theoretical blade profile point cloud data of the adjustable stator blade at the set height and specified state, import the theoretical blade profile point cloud data into the CAD, and unify the benchmark with the blade profile point cloud data to form a blade profile theoretical curve; A drawing unit for drawing a parametric great circle in CAD based on theoretical blade point cloud data; A line construction unit is used to draw a reference line based on the intersection of the blade theoretical curve and the parameter great circle, and to draw multiple measured lines based on the intersection of multiple blade measured curves and the parameter great circle; The data processing unit is used to calculate the deviation angles between multiple measured lines and the baseline, and determine the installation angle of the adjustable stator blades based on the set threshold.

9. The adjustable stator blade angle judgment system according to claim 8, characterized in that: The designated state is a design state or a closed state; The design state represents a state in which the angle of the adjustable stator blade is adjusted to 0°; The closed state refers to a state in which the angle of the adjustable stator blade is adjusted to a fully closed angle.

10. The adjustable stator blade angle judgment system according to claim 8, characterized in that: The mapping unit is specifically used for: Obtaining point cloud data of the rotation axis of the theoretical blade profile and the chord length of the theoretical blade profile; Import the point cloud data of the rotation axis into CAD and use the point cloud data of the rotation axis as the center of the parameter great circle; The diameter of the parameter great circle is less than or equal to the chord length of the theoretical blade profile, and the diameter of the parameter great circle is greater than 50% of the chord length of the theoretical blade profile.

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