A method for measuring cold throat area of turbine guide vane under assembly state
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- AECC SHENYANG ENGINE RES INST
- Filing Date
- 2025-12-08
- Publication Date
- 2026-07-21
AI Technical Summary
Existing technologies require additional fabrication of theoretical blade standard samples when measuring the throat area of turbine guide vanes, resulting in a large workload and inaccurate half-window area calculations, leading to errors in component area calculations and wasting costs and time.
Point cloud data is acquired using optical scanning. The end face plane of the blade is established by the minimum distance method. The blade profile is rotated to form a patchwork channel. The area of the full window and half window is calculated to avoid using theoretical blade standard samples.
It improves the accuracy and efficiency of turbine guide vane throat area measurement, reduces measurement costs and time, and can be directly used for guide vane assembly, saving resources.
Smart Images
Figure CN121655429B_ABST
Abstract
Description
Technical Field
[0001] This application belongs to the field of aero-engine or gas turbine technology, and specifically relates to a method for measuring the cold throat area of a turbine guide vane in a component state. Background Technology
[0002] The size of the throat area of a turbine guide vane directly affects the flow capacity of the turbine components, and thus the performance of the gas turbine or aero-engine. In the assembled configuration, the throat area of a turbine guide vane includes both full-window and half-window sections. Currently, when calculating and measuring the exhaust area of a turbine guide vane, the measurement of each half-window requires the use of a theoretical blade standard sample to assist in forming a full window. After measurement, the resulting area is divided by 2 to obtain the area of each half-window, and thus the assembly area.
[0003] However, this measurement and calculation method has the following disadvantages: 1) It requires additional processing of theoretical blade standard samples; 2) The two half windows of the component blade need to be measured twice, which is a lot of work; 3) The obtained values cannot reflect the difference in the area of the two half windows due to the different relative distances between the blade and the edge plate. As a result, the obtained values cannot accurately reflect the half window area. When assembling the guide vane or calculating the area, the above half window area values cannot be used and remeasurement is still required, which wastes costs and time; 4) Due to the inaccuracy of the half window area values, the area of the turbine guide vane assembly will be different.
[0004] Therefore, a method for measuring the cold throat area of turbine guide vanes in component state is needed to solve the above problems. Summary of the Invention
[0005] The purpose of this application is to provide a method for measuring the cold throat area of a turbine guide vane in a component state, so as to solve or alleviate at least one of the problems in the background art.
[0006] The technical solution of this application is: a method for measuring the cold throat area of a turbine guide vane in a component state, comprising:
[0007] Point cloud data is obtained by scanning the blade body and rim flow channel surface of the turbine guide vane in the component state using optical scanning method. The point cloud data is then distinguished to obtain blade body profile data, rim flow channel surface data and rim end face data.
[0008] Using the end face data of the flange plate, the minimum distance method is used to establish the end face planes on both sides of the flange plate respectively;
[0009] Rotate the end face plane of one half-window blade, the flow channel surface of the rim plate, and the blade profile until the end face planes on both sides of the rim plate coincide to form a splicing channel;
[0010] Solve for the total throat area of the turbine guide vane. and the area of the pieced-together passage ;
[0011] Based on the total throat area S q and the area S of the assembled channel b The area of the turbine guide vane assembly was calculated. ;
[0012] Calculate the area of the half-window based on the plane after the two end faces of the flange coincide. , .
[0013] Preferably, the process of obtaining point cloud data by scanning the blade body and rim flow channel surface of the turbine guide vane in the component state using an optical scanning method is as follows:
[0014] The turbine guide vane is placed in a 3D optical scanner for optical scanning. The scanning is performed using the principles of optical imaging positioning and grating measurement. The grating stripes are projected onto the surface of the blade assembly to obtain the dimensional spatial information of the blade surface. The scanning area includes the blade body and the flow channel surfaces of the upper and lower edge plates of the turbine guide vane. Through multiple scans, the geometric data of the blade in a specific direction is obtained in each scan. The point cloud data of the blade is then obtained by software calculation.
[0015] Preferably, if noise exists in the point cloud data, a pre-defined method is used to remove the noise generated during the point cloud data scanning process. The pre-defined method includes statistical analysis denoising, filter methods, machine learning or deep learning methods, curve fitting methods, and clustering algorithms.
[0016] Preferably, the process of establishing the end face planes on both sides of the flange using the minimum distance method based on the flange end face data is as follows:
[0017] Define a plane A, then the sum of the distances from the point cloud in the edge plate end face data to plane A is: , where d i Let be the distance from the i-th point cloud to plane A, where i∈[1,j];
[0018] Rotate plane A by 360 / n degrees to obtain plane B. The sum of the distances from the point cloud in the edge plate end face data to plane B is... ,in, Let be the distance from the i-th point cloud to plane B, where i∈[1,j], and n is the number of full-ring leaves;
[0019] Construct the expression for the distance between two planes, S = + Find plane A such that the distance between the two planes is minimized, and plane A and plane B are the two end faces of the flange respectively.
[0020] Preferably, the process of rotating the end face plane of one half-window blade, the flow channel surface of the rim plate, and the blade profile until the end face planes on both sides of the rim plate coincide to form a splicing channel is as follows:
[0021] Using the engine axis as the axis, select the end face plane, blade flow channel surface and blade profile corresponding to one side of the half window, and rotate 360 / n degrees away from the blade direction until the end face planes on both sides coincide. The rotated half window profile and the unrotated half window profile form a patchwork channel.
[0022] Preferably, the throat area of the turbine guide vane is calculated. and the area of the pieced-together passage The process is as follows:
[0023] The intersection lines of cross-sections at different radial heights with the outer profile of the turbine guide vane are used to characterize the width of the window, and are called the width profiles. The minimum distance 'a' between two adjacent blade width profiles corresponding to the window is measured. i ;
[0024] Determine the midpoints M1 and Mk of the width profile of the top and root sections of the turbine guide vane. Connect the two midpoints with a straight line, which intersects the upper and lower edge plates at points G and D, respectively. Use the distance between points G and D as the height H characteristic dimension. Then, the window area... k is the number of facets;
[0025] The total window throat area S is calculated based on the aforementioned window area formula. q and the area S of the assembled channel b .
[0026] Preferably, the area of the half-window is calculated based on the plane after the two end faces of the edge plate coincide. , The process is as follows:
[0027] The minimum distance 'a' between the width profile lines is determined by the planes where the two end faces of the flange coincide. i Divided into one half window width and the width of the other half of the window ;
[0028] Calculate the area of one half of the window ;
[0029] The other half of the window area .
[0030] The method of this application does not require theoretical blade standard samples, saving measurement costs, reducing the amount of measurement data, and improving the measurement efficiency of guide assembly. At the same time, when calculating the half window, the difference in the area of the two half windows caused by the different relative distances of the blade to the edge plate is taken into account, thereby improving the accuracy of the half window and assembly area. The obtained area can be directly used for guide assembly or guide area calculation, further saving costs and time. Attached Figure Description
[0031] To more clearly illustrate the technical solutions provided in this application, the accompanying drawings will be briefly described below. Obviously, the drawings described below are merely some embodiments of this application.
[0032] Figure 1 This is a schematic diagram of the method for measuring the cold throat area of a turbine guide vane in the component state according to this application.
[0033] Figure 2 This is a schematic diagram of the full window and half window of the double blade assembly in one embodiment of this application.
[0034] Figure 3 This is a schematic diagram of a patchwork channel in one embodiment of this application.
[0035] Figure 4 This is a schematic diagram of the width profile in this application.
[0036] Figure 5 This is a schematic diagram of the height dimensions in this application. Detailed Implementation
[0037] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be described in more detail below with reference to the accompanying drawings.
[0038] To overcome the problem of inaccurate measurement of the throat area of turbine guide vanes in the component state in the prior art, this application proposes a cold-state throat area measurement method for turbine guide vanes in the component state. This method does not require theoretical blade standard samples, and can improve the measurement efficiency of turbine guide vane components and improve the accuracy of half-window and component area.
[0039] like Figure 1 As shown, the method for measuring the cold throat area of a turbine guide vane in its component state provided in this application includes the following steps:
[0040] S1. The blade body and rim flow channel surface of the turbine guide vane in the component state are scanned by optical scanning to obtain point cloud data. The point cloud data are then distinguished to obtain blade body profile data, rim flow channel surface data and rim end face data.
[0041] A turbine guide vane typically consists of several individual blades. Two or more individual blades can form a blade assembly. Each blade assembly has m-1 full windows and 2 half windows, where m is the number of individual blades in each group. If each blade assembly consists of individual blades (m=1), then the blade assembly has no full windows, only 2 half windows. A full window refers to a multi-stage blade assembly, which has a complete full window; a half window refers to an incomplete window within a blade assembly. In the complete loop state of the guide vane, the half windows of two adjacent blade assemblies can be joined together to form a full window.
[0042] by Figure 2 Taking the high-pressure turbine guide vane as an example, the vane assembly consists of 2 single blades, that is, the vane assembly has 1 full window and 2 half windows, and the turbine guide vane consists of 44 single blades (that is, 22 vane assemblies).
[0043] The turbine guide vanes (or components) are placed in a 3D optical scanner for optical scanning. This involves projecting grating fringes onto the surface of the vane assembly and using optical imaging positioning and grating measurement principles to obtain the dimensional spatial information of the vane surface. The scanned areas include the blade body and the flow channel surfaces of the upper and lower edge plates. Through multiple scans, geometric data in a specific direction of the blade is obtained for each scan. Point cloud data of the blade is then calculated using ATOS software.
[0044] The leaf point cloud data obtained through the above process may contain noise. This application employs methods to remove noise generated during the point cloud data scanning process, including statistical analysis denoising, filter methods, machine learning or deep learning methods, curve fitting methods, clustering algorithms, etc. For example, in some embodiments of this application, a method of setting the maximum spacing between point clouds is used to remove noise generated during the scanning process.
[0045] For the noise-removed point cloud data, the point cloud data is distinguished and segmented according to the basin side, back side, upper edge plate, and lower edge plate corresponding to each turbine guide vane. Specifically, the basin side and back side of each blade can be segmented by the leading edge and trailing edge lines of the turbine guide vane. By using the intersection lines of the blade with the upper and lower edge plates to correspond to the leading edge and trailing edge lines where the blade shape is located, the different windows (full window or half window) of the edge plate can be distinguished.
[0046] S2, using the end face data of the flange plate, establish the end face planes on both sides of the flange plate respectively using the minimum distance method.
[0047] The specific process is as follows:
[0048] S21, define a plane A, then the sum of the distances from the point cloud in the edge plate end face data to plane A is: , where d iLet be the distance from the i-th point cloud to plane A, where i∈[1,j].
[0049] S22, rotate plane A by 360 / n degrees to obtain plane B. The sum of the distances from the point cloud in the edge plate end face data to plane B is... ,in, Let be the distance from the i-th point cloud to plane B, where i∈[1,j], and n is the number of full-ring leaves;
[0050] For example, in this embodiment of the application, the number of single blades is 44, so rotating plane A by 360 / 44 degrees will yield plane B.
[0051] S23, Construct the expression for the distance between two planes, S= + Find plane A such that S is minimized. At this time, plane A and plane B are the two end faces of the flange plate, respectively.
[0052] S3, rotate the end face plane of one half window blade, the flow channel surface of the rim plate, and the blade profile until the end face planes on both sides of the rim plate coincide to form a patchwork channel.
[0053] Using the engine axis as the axis, select the end face plane, blade flow channel surface, and blade profile corresponding to the left or right half-window, and rotate them approximately 360 / n degrees away from the blade direction until the end face planes on both sides coincide. The coincident end face plane is called plane C. The rotated half-window profile forms a patchwork channel with the unrotated half-window profile, such as... Figure 3 As shown.
[0054] S4, Solve for the full-window throat area of the turbine guide vane. and the area of the pieced-together passage .
[0055] In this application, the area of the throat of the entire window is calculated. and the area of the pieced-together passage The process is as follows:
[0056] S41, as Figure 4 As shown, cross-sections with different radial heights are intersected with the outer profile of the turbine guide vane. The resulting intersection line characterizes the width of the window and is called the width profile. The minimum distance 'a' between two adjacent blade width profiles corresponding to the window is measured. i For example, in this embodiment of the application, three cross-sections with different radial heights can be used to intersect with the outer profile of the turbine guide vane.
[0057] S42, as Figure 5As shown, based on the width dimension, determine the midpoints M1 and Mk of the width profile of the top and bottom sections. Connect the two midpoints with a straight line, which intersects the upper and lower edge plates at points G and D, respectively. Use the distance between points G and D as the height H characteristic dimension. Then, the window area... k is the number of facets.
[0058] Both the full window and the patchwork channel are calculated using the window area formula described above, thus obtaining the throat area S of the full window. q and the area S of the assembled channel b .
[0059] S5, based on the total window throat area S q and the area S of the assembled channel b The area of the turbine guide vane assembly was calculated. .
[0060] S6, Calculate the area of the half-window based on the plane after the two end faces of the edge plate coincide. , .
[0061] The minimum distance 'a' between the width profile lines is determined by plane C. i The line segment containing the minimum distance a i Divided into one half window width and the width of the other half of the window Calculate the area of one half of the window based on the following formula:
[0062]
[0063] That is, the area of the other half of the window is .
[0064] Table 1 shows the area of each window of the turbine guide vane obtained by the above method in this embodiment of the application.
[0065] Table 1 Area of each window
[0066]
[0067] The method for measuring the cold throat area of turbine guide vanes in the component state of this application does not require theoretical blade standard samples, saving measurement costs, reducing the amount of measurement data, and improving the measurement efficiency of guide vane components. At the same time, when calculating the half-window, the difference in the area of the two half-windows caused by the different relative distances between the blade and the edge plate is considered, thereby improving the accuracy of the half-window and component area. The obtained area can be directly used for guide vane assembly or guide vane area calculation, further saving costs and time.
[0068] The above description is merely a specific embodiment of this application, but the scope of protection of this application 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 this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.
Claims
1. A method of cold throat area measurement of a turbine guide vane in an assembly state, characterized by, include: Point cloud data is obtained by scanning the blade body and rim flow channel surface of the turbine guide vane in the component state using optical scanning method. The point cloud data is then distinguished to obtain blade body profile data, rim flow channel surface data and rim end face data. Using the end face data of the flange plate, the minimum distance method is used to establish the end face planes on both sides of the flange plate respectively; Rotate the end face plane of one half-window blade, the flow channel surface of the rim plate, and the blade profile until the end face planes on both sides of the rim plate coincide to form a splicing channel; Solving full window throat area of turbine guide vane and patch channel area , the process is: intersecting the profile surface of turbine guide vane with the section surface of different radial height, the intersection line is called width profile line, which represents the width of window, measuring the minimum distance a between two adjacent width profile lines of window i ; determining the midpoint M1, Mk of width profile line of top and root section of turbine guide vane, connecting the two midpoints into a straight line, the straight line intersects the upper and lower shroud at G point and D point, taking the distance between G and D points as height H characteristic size, then the window area , k is the number of section surface, i=1~k; calculating the full window throat area S based on the window area formula q and patch channel area S b ; Based on the total throat area S q and the area S of the assembled channel b The area of the turbine guide vane assembly was calculated. ; Calculate the area of the half-window based on the plane after the two end faces of the flange coincide. , The process is as follows: Based on the planes coinciding on both sides of the flange end face, the minimum distance 'a' between the width profile lines is determined. i Divided into one half window width and the width of the other half of the window ; Calculate the area of one half of the window ; The other half of the window area .
2. The method for measuring the cold throat area of a turbine guide vane in its component state as described in claim 1, characterized in that, The process of obtaining point cloud data by scanning the blade body and rim flow channel surface of the turbine guide vanes in the component state using optical scanning is as follows: The turbine guide vane is placed in a 3D optical scanner for optical scanning, which involves projecting grating stripes onto the surface of the vane assembly. The scanning is performed using optical imaging positioning and grating measurement principles to obtain the dimensional spatial information of the vane surface. The scanning areas include the blade body and the upper and lower edge flow channels of the turbine guide vane. Through multiple scans, geometric data of the vane in a specific direction is obtained for each scan. The point cloud data of the vane is then calculated by software.
3. The method for measuring the cold throat area of a turbine guide vane in its component state as described in claim 2, characterized in that, If noise exists in the point cloud data, a predetermined method is used to remove the noise generated during the point cloud data scanning process. The predetermined method includes statistical analysis denoising, filter method, machine learning or deep learning method, curve fitting method, and clustering algorithm.
4. The method for measuring the cold throat area of a turbine guide vane in its component state as described in claim 1, characterized in that, The process of establishing the end face planes on both sides of the flange using the minimum distance method based on the flange end face data is as follows: Define a plane A, then the sum of the distances from the point cloud in the edge plate end face data to plane A is: , where d i Let be the distance from the i-th point cloud to plane A, where i∈[1,j]; Rotate plane A by 360 / n degrees to obtain plane B. The sum of the distances from the point cloud in the edge plate end face data to plane B is... ,in, Let be the distance from the i-th point cloud to plane B, where i∈[1,j], and n is the number of full-ring leaves; Construct the expression for the distance between two planes, S = + Find plane A such that the distance between the two planes is minimized, and plane A and plane B are the two end faces of the flange respectively.
5. The method for measuring the cold throat area of a turbine guide vane in its component state as described in claim 4, characterized in that, The process of rotating the end face plane of one half-window blade, the flow channel surface of the rim plate, and the blade profile until the end face planes on both sides of the rim plate coincide to form a splicing channel is as follows: Using the engine axis as the axis, select the end face plane, blade flow channel surface and blade profile corresponding to one side of the half window, and rotate 360 / n degrees away from the blade direction until the end face planes on both sides coincide. The rotated half window profile and the unrotated half window profile form a patchwork channel.