Method and computer system for measuring film pores in turbine blades

Abstract

This invention discloses a method and computer system for measuring the film film pores of turbine blades. In the technical solution of this invention, an optical measurement method is used to perform local fine scanning of typical film film pore areas of the blade, obtaining point cloud data of the blade profile and the inner contour of typical film film pores. This data is then fitted with a design model to obtain a measurement benchmark and the diameter value of typical film film pores. A CT surface contour segmentation threshold is determined, and the CT scan data is surface-defined based on the segmentation threshold to obtain the CT detection contour of the blade profile and the three-dimensional contour of all film film pores on the blade, thus achieving the measurement of film film pore diameter and position.

Description

Technical Field

[0001] This invention relates to the field of detection technology, and in particular to a method and computer system for measuring the film pores of turbine blades based on optics and X-rays. Background Technology

[0002] Turbine blades are crucial components in aero-engines and gas turbines. Because turbine blades endure high temperatures, high pressures, and significant stresses during operation, they are typically designed as hollow structures with film cooling holes of varying diameters and orientations machined into the blade body to achieve cooling. The size and position of these film cooling holes significantly impact blade cooling efficiency; therefore, it is essential to measure the hole diameter and position (including the drilling angle). Industrially used methods for measuring film cooling holes include coordinate measuring machines (CMMs), plug gauge measurements, optical methods, and CT measurements.

[0003] However, due to the small size of the air film aperture, typically between 0.3mm and 0.7mm, traditional coordinate measuring machines (CMMs) cannot use probes that can penetrate deep into the aperture for contact measurement. In industry, plug gauges are commonly used; however, this method cannot provide precise aperture values, only assessing the aperture distribution range, failing to meet the requirements for quantitative measurement and making it difficult to measure the drilling angle of the air film aperture. Optical measurement methods are limited by aperture size and cannot acquire contour information inside the air film aperture, significantly restricting their detection effectiveness.

[0004] Industrial CT technology can clearly and intuitively display the internal structure, composition, and defects of an inspected object in the form of two-dimensional or three-dimensional tomographic images under non-destructive conditions. Compared with ultrasonic testing and eddy current testing, which can only measure wall thickness, it can not only obtain the internal structural features of an object but also measure its internal dimensions and shapes, thus attracting increasing applications and attention. However, the industrial CT measurement process is complex and influenced by many factors. Compared with mature dimensional measurement methods such as coordinate measuring machines (CMMs), its dimensional measurement accuracy and uncertainty assessment methods are still immature. In particular, it is necessary to use suitable dimensional measurement standards to control the dimensional measurement process and assess measurement accuracy and uncertainty.

[0005] Therefore, there is a need for a method and system that can improve upon the shortcomings of existing technologies. Summary of the Invention

[0006] This summary is provided to introduce, in a simplified form, some concepts that will be further described in the following detailed description section. This summary is not intended to identify key or essential features of the claimed subject matter, nor is it intended to help determine the scope of the claimed subject matter.

[0007] To overcome the shortcomings of traditional methods for measuring the size and position of film-forming holes in turbine blades, this patent designs a method and computer system for measuring the diameter and position of film-forming holes in turbine blades based on an integrated optical and X-ray approach. The method employs optical measurement to perform localized fine scanning of typical film-forming hole areas on the blade, obtaining point cloud data of the blade profile and the inner contour of typical film-forming holes. This data is then fitted with a design model to obtain a measurement benchmark and the diameter values ​​of typical film-forming holes. A CT surface contour segmentation threshold is determined, and the CT scan data is surface-defined based on this threshold to obtain the CT-detected profile of the blade profile and the three-dimensional profile of all film-forming holes on the blade, thus achieving the measurement of film-forming hole diameter and position.

[0008] Specifically, in one embodiment of the present invention, a method for measuring the film gas pores of a turbine blade is provided, the method comprising:

[0009] Optical point cloud data is obtained by optically scanning the part of the leaf containing typical film pores. The optical point cloud data includes the optical point cloud of the outer contour of the leaf body of the typical film pore area and the optical point cloud of the inner contour of the film pore.

[0010] The optical point cloud of the blade's outer contour is fitted based on the blade design model to obtain the actual measurement benchmark for the blade's optical scanning.

[0011] The optical point cloud of the inner contour of the film pore is fitted based on the actual measurement benchmark of the leaf optical scanning to obtain the aperture value of the typical film pore.

[0012] A CT scan is performed on the leaf blade to obtain the CT three-dimensional volumetric data of the leaf blade;

[0013] The surface definition threshold of the CT three-dimensional volume data is determined based on the aperture value, and the surface definition of the CT three-dimensional volume data is performed based on the surface definition threshold to obtain the CT detection contour of the leaf and the CT surface contour point cloud data.

[0014] The CT surface contour point cloud data is fitted with the optical point cloud data to obtain the CT contour reference of the leaf blade.

[0015] Based on the CT contour benchmark, the CT surface contour point cloud data is fitted to obtain the central axis of each film film hole, and the central axis of the film film hole is compared with the angle of the central axis of the film film hole on the blade design model to obtain the angle deviation of the film film hole.

[0016] The CT-measured coordinates of the positions of each air film pore are obtained based on the central axis of the air film pore; and

[0017] Calculate the deviation between the CT measured coordinates of the air film vent location and the coordinates of each air film vent on the blade design model.

[0018] In one embodiment of the present invention, the method further includes:

[0019] Based on this CT profile benchmark, the inner contour of the air film aperture on the CT detection profile is fitted to obtain the CT measurement aperture of each air film aperture; and

[0020] The aperture measured by CT is compared with the aperture on the blade design model to obtain the aperture deviation.

[0021] In one embodiment of the invention, the portion containing typical film gas vents includes blade process positioning points.

[0022] In one embodiment of the present invention, the blade design model is a UG design model.

[0023] In one embodiment of the present invention, the method further includes fitting an optical point cloud based on the inner contour of the air film aperture to obtain the central axis of the air film aperture.

[0024] In one embodiment of the present invention, the CT three-dimensional volume data is CT grayscale distribution three-dimensional volume data.

[0025] In one embodiment of the present invention, obtaining the CT measured coordinates of the position of each air film pore based on the central axis of the air film pore further includes: extending the central axis of the air film pore to intersect with the CT detection contour and taking the intersection point as the leaf position of the air film pore to obtain the CT measured coordinates of the air film pore position.

[0026] In one embodiment of the present invention, the deviation between the CT measured coordinates of the air film aperture position and the coordinates of each air film aperture on the blade design model is calculated in the following way:

[0027]

[0028] The CT-measured coordinates of the location of the air film pore are (x i-CT ,y i-CT ,z i-CT The coordinates of each film pore on the blade design model are (x...). i0 ,y i0 ,z i0 ).

[0029] In another embodiment of the present invention, a computer system for measuring the film gas aperture of turbine blades is provided, the computer system comprising:

[0030] An optical probe is configured to perform optical scanning on the blade to be tested, which includes optical point cloud data of the outer contour of the blade body and the inner contour of the air film pores in the typical air film pore area.

[0031] An X-ray source is configured to perform a CT scan of the leaf blade to obtain CT three-dimensional volumetric data of the leaf blade; and

[0032] The controller is configured to:

[0033] The optical point cloud of the blade's outer contour is fitted based on the blade design model to obtain the actual measurement benchmark for the blade's optical scanning.

[0034] The optical point cloud of the inner contour of the film pore is fitted based on the actual measurement benchmark of the leaf optical scanning to obtain the aperture value of the typical film pore.

[0035] The surface definition threshold of the CT three-dimensional volume data is determined based on the aperture value, and the surface definition of the CT three-dimensional volume data is performed based on the surface definition threshold to obtain the CT detection contour of the leaf and the CT surface contour point cloud data.

[0036] The CT surface contour point cloud data is fitted with the optical point cloud data to obtain the CT contour reference of the leaf blade.

[0037] Based on the CT contour benchmark, the CT surface contour point cloud data is fitted to obtain the central axis of each film film hole, and the central axis of the film film hole is compared with the angle of the central axis of the film film hole on the blade design model to obtain the angle deviation of the film film hole.

[0038] The CT-measured coordinates of the positions of each air film pore are obtained based on the central axis of the air film pore; and

[0039] Calculate the deviation between the CT measured coordinates of the air film vent location and the coordinates of each air film vent on the blade design model.

[0040] In one embodiment of the present invention, the controller is further configured to:

[0041] Based on this CT profile benchmark, the inner contour of the air film aperture on the CT detection profile is fitted to obtain the CT measurement aperture of each air film aperture; and

[0042] The aperture measured by CT is compared with the aperture on the blade design model to obtain the aperture deviation.

[0043] In one embodiment of the invention, the controller is further configured to fit the central axis of the air film aperture based on the optical point cloud of the inner contour of the air film aperture.

[0044] In one embodiment of the present invention, the controller is further configured to obtain the CT measured coordinates of the air film vent location by extending the central axis of the air film vent to intersect the CT detection profile and taking the intersection point as the leaf position of the air film vent to obtain the CT measured coordinates of the air film vent location.

[0045] In one embodiment of the invention, the controller is further configured to calculate the deviation between the CT measured coordinates of the film cooling hole position and the coordinates of each film cooling hole on the blade design model in the following manner:

[0046]

[0047] The CT-measured coordinates of the location of the air film pore are (x i-CT ,y i-CT ,z i-CT The coordinates of each film pore on the blade design model are (x...). i0 ,y i0 ,z i0 ).

[0048] Other aspects, features, and embodiments of the invention will become apparent to those skilled in the art after reading the following description of specific exemplary embodiments of the invention in conjunction with the accompanying drawings. Although features of the invention may be discussed below with reference to certain embodiments and drawings, all embodiments of the invention may include one or more of the advantageous features discussed herein. In other words, while one or more embodiments may be discussed having certain advantageous features, one or more of such features may also be used according to the various embodiments of the invention discussed herein. Similarly, although exemplary embodiments may be discussed below as embodiments of devices, systems, or methods, it should be understood that such exemplary embodiments may be implemented in various devices, systems, and methods. Attached Figure Description

[0049] To gain a more detailed understanding of the features described above in this disclosure, reference can be made to a more specific description of the above-briefly summarized aspects, some of which are illustrated in the accompanying drawings. However, it should be noted that the drawings illustrate only certain typical aspects of this disclosure and should not be considered as limiting its scope, as other equivalent aspects are permissible in this description.

[0050] Figure 1 A schematic diagram of a computer system for measuring the film gas holes of turbine blades according to an embodiment of the present disclosure is shown.

[0051] Figure 2 This is a schematic diagram of a blade with air film perforation according to an embodiment of the present disclosure.

[0052] Figure 3 This is a detailed schematic diagram of a blade with air film perforations according to an embodiment of the present disclosure, wherein the leaf basin side is on the left and the leaf back side is on the right.

[0053] Figure 4 This is an optical scan image of a typical air film pore portion according to an embodiment of the present disclosure.

[0054] Figure 5 This is a schematic diagram of the fitting result of an optical measurement point cloud and a design model according to an embodiment of the present disclosure.

[0055] Figure 6 This is a schematic diagram of the surface fitting of the air film pores according to an embodiment of the present disclosure.

[0056] Figure 7 This is a schematic diagram of the air film pore diameter fitting measurement results according to an embodiment of the present disclosure.

[0057] Figure 8 This is a schematic diagram of the measurement results of the air film aperture angle according to an embodiment of the present disclosure.

[0058] Figure 9 This is a flowchart of a method for measuring the film pores of a turbine blade according to an embodiment of the present disclosure. Detailed Implementation

[0059] The various embodiments will now be described in more detail with reference to the accompanying drawings, which form part of this invention and illustrate specific exemplary embodiments. However, the embodiments may be implemented in many different forms and should not be construed as limiting the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and that the scope of these embodiments will be fully conveyed to those skilled in the art. The embodiments may be implemented as methods, systems, or devices. Therefore, these embodiments may be implemented in hardware, entirely in software, or in a combination of software and hardware aspects. Therefore, the following detailed description is not intended to be limiting.

[0060] The steps in each flowchart can be performed by hardware (e.g., processor, engine, memory, circuitry), software (e.g., operating system, application, driver, machine / processor executable instructions), or a combination thereof. As will be understood by those skilled in the art, the methods involved in each embodiment may include more or fewer steps than shown.

[0061] This invention proposes a method and computer system for measuring the film film pores of turbine blades based on an integrated optical and X-ray approach. The method employs optical measurement to perform localized fine scanning of typical film film pore areas on the blade, obtaining point cloud data of the blade profile and the inner contour of typical film film pores. This data is then fitted with a design model to obtain a measurement benchmark and typical film film pore diameter values. A CT surface contour segmentation threshold is determined, and the CT scan data is surface-defined based on this threshold to obtain the CT detection contour of the blade profile and the three-dimensional contours of all film film pores on the blade, thus achieving the measurement of film film pore diameter and position. This invention overcomes the technical difficulty of traditional methods in measuring film film pore diameter and position, enabling quantitative measurement of these parameters for turbine blades. It is applicable to the measurement of film film pores with different diameters on blades of different structures, achieving a diameter and position measurement accuracy within 0.1 mm and an angle measurement accuracy within 2°, while significantly improving detection efficiency.

[0062] The following sections will provide a more detailed and comprehensive description of various aspects of this disclosure using block diagrams and method flowcharts.

[0063] Figure 1 A schematic diagram of a computer system 100 for measuring the film gas holes of turbine blades according to an embodiment of the present disclosure is shown.

[0064] like Figure 1 As shown, in one embodiment of the present invention, the computer system 100 may include an optical probe, an X-ray source, and a controller. The following will be combined with... Figure 2-8 The optical probe, X-ray source, and controller are described in detail. In another embodiment of the invention, the computer system 100 may further include a power supply system, a data storage system, an X-ray detector, a mechanical system, and an optical detection system including the optical probe. Since these components are well known in the art, they will not be described in detail here.

[0065] In one embodiment of the invention, the optical probe may be configured to be used on the blade to be tested (e.g., Figure 2 Optical scanning was performed on typical air film pore areas (as shown) to obtain optical point cloud data (e.g. Figure 4 (As shown). In this embodiment, the optical point cloud data may include the optical point cloud of the outer contour of the blade and the inner contour of the air film vent region of a typical air film vent area, and the region containing the typical air film vent may include blade process positioning points (such as...). Figure 3 (As shown).

[0066] In one embodiment of the present invention, an X-ray source may be configured to perform a CT scan of the leaf blade to obtain CT three-dimensional volumetric data of the leaf blade. In this embodiment, the X-ray source may perform a CT scan of the leaf blade portion to obtain CT scan three-dimensional point cloud data of the leaf blade profile and air film pores. In this embodiment, the CT three-dimensional volumetric data may be CT grayscale distribution three-dimensional volumetric data, but in other embodiments of the present invention, the CT three-dimensional volumetric data may be any other suitable three-dimensional volumetric data.

[0067] In one embodiment of the invention, the controller can be configured to fit an optical point cloud of the blade's outer contour based on a blade design model to obtain a blade optical scanning measurement reference for the blade under test (e.g., ...). Figure 5 (As shown), to convey design benchmarks. In this embodiment, the blade design model can be a UG design model, but in other embodiments of the invention, the blade design model can be any other suitable design model.

[0068] In this embodiment, the controller can also be configured to fit the optical point cloud of the inner contour of the film film aperture based on the measured optical scan of the blade to obtain the aperture value of the typical film film aperture. The controller can select typical film film aperture contour point cloud data of the blade and fit the point cloud to obtain the aperture value of the typical film film aperture. In another embodiment of the invention, the controller can be further configured to fit the central axis of the film film aperture based on the optical point cloud of the inner contour of the film film aperture.

[0069] In one embodiment of the invention, the controller may also be configured to determine a surface definition threshold for the CT three-dimensional volume data based on the aperture value and to perform surface definition on the CT three-dimensional volume data based on the surface definition threshold to obtain the CT detection profile of the leaf and CT surface profile point cloud data (e.g., Figure 6 (As shown). The controller can determine the surface definition threshold of the CT grayscale distribution three-dimensional volume data based on the typical air film aperture value, and perform surface definition on the CT grayscale three-dimensional volume data to obtain the CT surface contour point cloud data of the blade.

[0070] In one embodiment of the invention, the controller may further be configured to fit the CT surface contour point cloud data to the optical point cloud data to obtain a CT contour reference for the blade. The controller can perform optimal fitting between the blade CT surface contour point cloud data and the surface point cloud data measured by optical methods to obtain a blade CT contour reference.

[0071] In one embodiment of the present invention, the controller may further be configured to fit the CT surface contour point cloud data based on the CT contour reference to obtain the central axis of each film film vent, and compare the central axis of the film film vent with the angle of the central axis of the film film vent on the blade design model to obtain the angle deviation of the film film vent. The controller can fit and obtain the central axis P of the film film vent. i-CT Compared to P i-CT The angle between the design pore center axis and the pore drilling angle deviation Δθ is obtained. i .like Figure 8 As shown in the figure. Table 1 below also illustrates this angular deviation.

[0072] Table 1. Measurement results of air film aperture angle

[0073]

[0074]

[0075] In another embodiment of the invention, the controller may optionally be configured to: fit the inner contour of the air film pores on the CT detection contour based on the CT contour reference to obtain the CT measurement aperture of each air film pore; and compare the CT measurement aperture with the aperture on the blade design model to obtain the aperture deviation. In this embodiment, the controller can fit the inner contour of each air film pore on the CT contour to obtain the aperture deviation of each air film pore M. i CT measurement aperture ф i .like Figure 7 As shown.

[0076] In one embodiment of the invention, the controller may further be configured to obtain the CT measured coordinates of the air film pore positions of each air film pore based on the central axis of the air film pore. In this embodiment, the controller may be further configured to obtain the CT measured coordinates of the air film pore positions by extending the central axis of the air film pore to intersect the CT detection contour and taking the intersection point as the blade position of the air film pore to obtain the CT measured coordinates of the air film pore positions. The controller may obtain the CT measured coordinates of the air film pore positions based on the obtained central axis P of the air film pore. i-CT Extend the central axis P i-CT The point where the air film pore M intersects with the leaf blade outline is the air film pore. i The position of the leaf blade, i.e. (x i-CT ,y i-CT ,z i-CT ), to obtain each air film pore M i Location CT measured coordinates.

[0077] In the above embodiments, the controller can also be configured to calculate the deviation between the CT measured coordinates of the film cooling hole position and the coordinates of each film cooling hole on the blade design model. The controller is further configured to calculate the deviation between the CT measured coordinates of the film cooling hole position and the coordinates of each film cooling hole on the blade design model in the following manner: The CT-measured coordinates of the location of the air film pore are (x i-CT ,y i-CT ,z i-CT The coordinates of each film pore on the blade design model are (x...). i0 ,y i0 ,z i0 The controller can adjust the pressure according to the air film vent M. i Coordinates (x) on the design model i0 ,y i0 ,z i0 The deviation Δd between the CT measured coordinates and the design coordinates of the air film vent location is calculated using the above formula. i .

[0078] As those skilled in the art will understand, the above calculation formulas are merely exemplary and not restrictive. Any other suitable calculation formulas may be used in other embodiments of the present invention to calculate the deviation of the air film pore position coordinates.

[0079] Ultimately, the controller can obtain the M values ​​of each film pore on the blade. i aperture value ф i air film pore position deviation Δd i and angle value θ i The pore diameter and position of the air film pores on the blades were measured, as shown in Table 1 above and Table 2 below.

[0080] Table 2. Measurement results of air film pore diameter and position.

[0081]

[0082]

[0083] Figure 9 This is a flowchart of a method 900 for measuring the film pores of a turbine blade according to an embodiment of the present disclosure.

[0084] Method 900 begins at step 902, which involves optically scanning the area containing typical film vents on the blade under test to obtain optical point cloud data. This optical point cloud data includes the outer contour of the blade body and the inner contour of the film vents within the typical film vent region. In one embodiment of the invention, the area containing typical film vents may include blade manufacturing positioning points, and the blade design model may be a UG design model.

[0085] Next, method 900 continues to step 904, fitting the optical point cloud of the outer contour of the blade based on the blade design model to obtain the blade optical scanning measurement benchmark of the blade under test.

[0086] Then, method 900 continues to step 906, fitting the optical point cloud of the inner contour of the film film aperture based on the measured optical scan of the blade to obtain the aperture value of the typical film film aperture. In one embodiment of the invention, the method further includes fitting the central axis of the film film aperture based on the optical point cloud of the inner contour of the film film aperture.

[0087] Subsequently, method 900 continues to step 908, where a CT scan is performed on the leaf blade to obtain CT three-dimensional volumetric data of the leaf blade. In one embodiment of the present invention, the CT three-dimensional volumetric data may be CT grayscale distribution three-dimensional volumetric data.

[0088] Next, method 900 continues to step 910, determining the surface definition threshold of the CT three-dimensional volume data based on the aperture value, and performing surface definition on the CT three-dimensional volume data based on the surface definition threshold to obtain the CT detection contour of the leaf and the CT surface contour point cloud data.

[0089] Next, method 900 continues to step 912, fitting the CT surface contour point cloud data with the optical point cloud data to obtain the CT contour reference of the leaf.

[0090] Subsequently, method 900 continues to step 914, fitting the CT surface contour point cloud data based on the CT contour reference to obtain the central axis of each film-forming hole, and comparing the angle of the central axis of the film-forming hole with that of the film-forming hole on the blade design model to obtain the angle deviation of the film-forming hole. In another embodiment of the present invention, method 900 may optionally include fitting the inner contour of the film-forming hole on the CT detection contour based on the CT contour reference to obtain the CT measurement aperture of each film-forming hole; and comparing the CT measurement aperture with the aperture on the blade design model to obtain the aperture deviation.

[0091] Then, method 900 continues to step 916, obtaining the CT measured coordinates of the air film pore position of each air film pore based on the central axis of the air film pore. In one embodiment of the present invention, obtaining the CT measured coordinates of the air film pore position of each air film pore based on the central axis of the air film pore further includes: extending the central axis of the air film pore to intersect with the CT detection contour and taking the intersection point as the leaf position of the air film pore to obtain the CT measured coordinates of the air film pore position.

[0092] Finally, method 900 continues to step 918, calculating the deviation between the CT measured coordinates of the film cooling hole location and the coordinates of each film cooling hole on the blade design model. In one embodiment of the present invention, the deviation between the CT measured coordinates of the film cooling hole location and the coordinates of each film cooling hole on the blade design model is calculated in the following manner: The CT-measured coordinates of the location of the air film pore are (x i-CT ,y i-CT ,z i-CT The coordinates of each film pore on the blade design model are (x...). i0 ,y i0 ,z i0 ).

[0093] After step 918, method 900 ends.

[0094] In summary, to overcome the shortcomings of existing methods that cannot accurately measure the size and position of film venting holes in turbine blades, the technical solution of this invention determines a CT surface contour segmentation threshold based on a typical film venting hole profile obtained by optical measurement, defines the surface of the CT scan data according to this segmentation threshold, and fits the CT scan surface contour point cloud to obtain a measurement benchmark for the blade CT scan point cloud. Based on this benchmark, the aperture and position of the film venting holes are accurately measured and calculated. Therefore, this invention enables quantitative measurement of the aperture and position of film venting holes in turbine blades, and improves the measurement accuracy and detection efficiency of film venting holes in turbine blades.

[0095] The embodiments of the present invention have been described above with reference to block diagrams and / or operational descriptions of methods, systems, and computer program products according to embodiments of the present invention. The functions / actions indicated in the blocks may appear in a different order than shown in any flowchart. For example, depending on the functions / actions involved, two blocks shown consecutively may actually be executed substantially simultaneously, or these blocks may sometimes be executed in reverse order.

[0096] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A method for measuring the film gas aperture of a turbine blade, the method comprising: Optical point cloud data is obtained by optically scanning the part of the blade containing typical air film pores. The optical point cloud data includes the optical point cloud of the outer contour of the blade body of the typical air film pore area and the optical point cloud of the inner contour of the air film pore. The optical point cloud of the outer contour of the blade is fitted based on the blade design model to obtain the actual measurement benchmark of the blade optical scan of the blade under test. The optical point cloud of the inner contour of the film pore is fitted based on the actual measurement benchmark of the leaf optical scanning to obtain the aperture value of the typical film pore. A CT scan of the leaf blade to be tested is performed to obtain the CT three-dimensional volumetric data of the leaf blade; The surface definition threshold of the CT three-dimensional volume data is determined based on the aperture value, and the surface definition of the CT three-dimensional volume data is performed based on the surface definition threshold to obtain the CT detection contour of the leaf and the CT surface contour point cloud data. The CT surface contour point cloud data is fitted with the optical point cloud data to obtain the CT contour reference of the leaf body; The CT surface contour point cloud data is fitted based on the CT contour reference to obtain the central axis of each film film hole, and the angle of the central axis of the film film hole is compared with the angle of the central axis of the film film hole on the blade design model to obtain the angle deviation of the film film hole. The CT-measured coordinates of the position of each air film hole are obtained based on the central axis of the air film hole. as well as Calculate the deviation between the CT measured coordinates of the air film pore positions and the coordinates of each air film pore on the blade design model.

2. The method of claim 1, wherein the method further comprises: Based on the CT contour reference, the inner contour of the air film hole on the CT detection contour is fitted to obtain the CT measurement aperture of each air film hole. as well as The aperture measured by CT is compared with the aperture on the blade design model to obtain the aperture deviation.

3. The method of claim 1, wherein the method further comprises fitting an optical point cloud based on the inner contour of the air film aperture to obtain the central axis of the air film aperture.

4. The method of claim 1, wherein obtaining the CT-measured coordinates of the air film pore positions of each air film pore based on the central axis of the air film pore further comprises: Extend the central axis of the air film pore to intersect the CT detection contour, and take the intersection point as the leaf position of the air film pore to obtain the CT measured coordinates of the air film pore position.

5. The method as described in claim 1, wherein the deviation between the CT measured coordinates of the film cooling vent positions and the coordinates of each film cooling vent on the blade design model is calculated in the following manner: The measured CT coordinates of the air film pore location are (x i-CT ,y i-CT ,z i-CT The coordinates of each film pore on the blade design model are (x, y). i0 ,y i0 ,z i0 ).

6. A computer system for measuring the film gas apertures of turbine blades, the computer system comprising: An optical probe is configured to perform optical scanning on the blade to be tested, which includes a typical air film pore area, to obtain optical point cloud data. The optical point cloud data includes the optical point cloud of the outer contour of the blade body and the inner contour of the air film pore area of ​​the typical air film pore region. An X-ray source is configured to perform a CT scan on the leaf blade of the leaf under test to obtain CT three-dimensional volumetric data of the leaf blade. as well as The controller is configured to: The optical point cloud of the outer contour of the blade is fitted based on the blade design model to obtain the actual measurement benchmark of the blade optical scan of the blade under test. The optical point cloud of the inner contour of the film pore is fitted based on the actual measurement benchmark of the leaf optical scanning to obtain the aperture value of the typical film pore. The surface definition threshold of the CT three-dimensional volume data is determined based on the aperture value, and the surface definition of the CT three-dimensional volume data is performed based on the surface definition threshold to obtain the CT detection contour of the leaf and the CT surface contour point cloud data. The CT surface contour point cloud data is fitted with the optical point cloud data to obtain the CT contour reference of the leaf body; The CT surface contour point cloud data is fitted based on the CT contour reference to obtain the central axis of each film film hole, and the angle of the central axis of the film film hole is compared with the angle of the central axis of the film film hole on the blade design model to obtain the angle deviation of the film film hole. The CT-measured coordinates of the position of each air film hole are obtained based on the central axis of the air film hole. as well as Calculate the deviation between the CT measured coordinates of the air film pore positions and the coordinates of each air film pore on the blade design model.

7. The computer system of claim 6, wherein the controller is further configured to: Based on the CT profile reference, the inner contour of the air film aperture on the CT detection profile is fitted to obtain the CT measurement aperture of each air film aperture; and The aperture measured by CT is compared with the aperture on the blade design model to obtain the aperture deviation.

8. The computer system of claim 6, wherein the controller is further configured to fit the central axis of the air film aperture based on the optical point cloud of the inner contour of the air film aperture.

9. The computer system of claim 6, wherein the controller is further configured to obtain the CT measured coordinates of the air film vent location by extending the central axis of the air film vent to intersect the CT detection profile and taking the intersection point as the leaf position of the air film vent to obtain the CT measured coordinates of the air film vent location.

10. The computer system of claim 6, wherein the controller is further configured to calculate the deviation between the CT measured coordinates of the film cooling vent positions and the coordinates of each film cooling vent on the blade design model by means of: The measured CT coordinates of the air film pore location are (x i-CT ,y i-CT ,z i-CT The coordinates of each film pore on the blade design model are (x, y). i0 ,y i0 ,z i0 ).

Images