Measuring tube for measuring total parameters of outlet of axial flow turbine performance test piece
By designing a rotatable measuring tube, the problem of inaccurate measurement when the outlet airflow direction of the turbine performance test piece deviates from the axial direction was solved, achieving greater accuracy and adaptability in measuring airflow parameters over a wider range.
Patent Information
- Application Number
- CN202511104525.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-07
- Publication Date
- 2025-11-14
AI Technical Summary
In existing technologies, when the outlet airflow direction of a turbine performance test piece deviates from the axial direction, the total pressure measurement is inaccurate and the airflow parameters cannot be effectively measured.
A rotatable measuring tube is designed, which allows the measuring tube to be fixed within different angle ranges by setting multiple threaded holes on a circular cover plate and a square mounting base. The angle between the measuring hole and the turbine axis can be adjusted to adapt to different airflow directions.
It improves the accuracy and adaptability of measuring airflow parameters, enabling accurate measurement of airflow pressure and temperature over a wider range.
Smart Images
Figure CN120946422A_ABST
Abstract
Description
Technical Field
[0001] This application belongs to the field of gas turbines, and specifically relates to a measuring tube for measuring the total outlet parameters of an axial flow turbine performance test piece. Background Technology
[0002] When conducting turbine performance tests on aero-engines and gas turbines, it is necessary to measure the total parameters of the turbine outlet airflow—including total pressure and total temperature—in order to obtain the turbine test characteristics. In the existing technology, total pressure and total temperature are usually measured by total pressure pipes and total temperature pipes.
[0003] Taking the main pressure pipe as an example, the arrangement of the main temperature pipe is the same. For example... Figure 1 As shown, the turbine performance test piece 1 includes multi-stage guide vanes 11 and working vanes 12. A total pressure pipe 2 is arranged on the casing 13 at its outlet position. The total pressure pipe 2 extends into the main flow section and is tubular, with a measuring hole 21 on it. (See diagram below.) Figure 2 and Figure 3 As shown, the main pressure pipe 2 has a rectangular cover plate 22 on the outer part of the casing, and the cover plate 22 and the main pressure pipe 2 are an integral structure; the casing 13 is provided with a mounting base 23, and the cover plate 22 and the mounting base 23 are fixed together by four screws 25, and the two are engaged by contact surfaces 24. Figure 4 As shown, a measuring hole 21 is provided on the total pressure pipe 2. The measuring hole 21 faces the airflow, and its center line is in the same direction as the turbine axis. All the measuring holes 21 on the total pressure pipe 2 are arranged in the same direction.
[0004] In the existing technology, the centerline of the measuring hole 21 of the total pressure pipe 2 is fixed axially, and the relative position of the total pressure pipe 2 and the mounting seat 23 on the casing 13 is fixed. This only satisfies the measurement of the total airflow parameters when the outlet airflow direction of the turbine performance test is axial exhaust or deviates slightly from the turbine axis direction. When the outlet airflow direction of the turbine performance test piece deviates significantly from the axial direction, it exceeds the testing range of the measuring hole 21 on the total pressure pipe 2, and the total pressure measured at this measuring point deviates significantly from the true value. Figure 5 As shown. Summary of the Invention
[0005] The purpose of this application is to provide a measuring tube for measuring the total outlet parameters of an axial turbine performance test piece, in order to solve or mitigate at least one of the problems in the prior art.
[0006] The technical solution of this application is: a measuring tube for measuring the total parameters of the outlet of an axial turbine performance test piece, comprising: a measuring hole extending into the main channel, a circular cover plate fixedly connected to the measuring tube, and a square mounting base fixedly connected to the turbine performance test piece casing, wherein the center of the circular cover plate coincides with that of the square mounting base, and multiple threaded holes are opened on both the circular cover plate and the square mounting base, and the rotation of the measuring tube is achieved by adjusting the angle between the threaded holes of the circular cover plate and the threaded holes of the square mounting base relative to the center.
[0007] In at least one embodiment of this application, the measuring tube includes a total temperature tube and a total pressure tube.
[0008] In at least one embodiment of this application, the circular cover plate is fixed to the measuring tube by welding; the square mounting base is fixed to the turbine performance test specimen casing by welding.
[0009] In at least one embodiment of this application, the diameter of the circular cover plate is smaller than the side length of the square mounting base.
[0010] In at least one embodiment of this application, the plurality of threaded holes include two threaded holes that are symmetrical about the turbine axis and at least one set of threaded holes that rotate clockwise and counterclockwise by a predetermined angle around the center of the circular cover plate.
[0011] In at least one embodiment of this application, when the circular cover plate overlaps with two threaded holes symmetrical about the turbine axis in the square mounting base, the measuring tube is fixed by connecting any other set of threaded holes through a connector, so that the measuring tube measures the airflow pressure or temperature in the intake direction and the axial direction within the rated range.
[0012] When the circular cover plate and the two threaded holes in the square mounting base that are symmetrical about the turbine axis direction do not overlap, the measuring tube is fixed by connecting any other set of threaded holes through the connector, so that the measuring tube measures the airflow pressure or temperature in the intake direction and the axis direction that are outside the rated range.
[0013] The measuring tube provided in this application is arranged with a certain angle between the center line of the measuring hole and the turbine axis at different radial heights to adapt to different turbine outlet airflow direction ranges. Compared with the method of uniformly arranging the measuring holes in the same direction as the turbine axis, this application can further improve the overall airflow angle range measured by the total pressure tube. Attached Figure Description
[0014] 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.
[0015] Figure 1 This is a schematic diagram of the total pressure measurement scheme for turbine performance test specimens in the existing technology.
[0016] Figure 2 This is a schematic diagram of the total pressure tube used for measuring the total pressure of turbine performance test specimens.
[0017] Figure 3 Based on Figure 2 A top view of the AA section.
[0018] Figure 4 Based on Figure 2 A top view of the BB section.
[0019] Figure 5 This is a schematic diagram of the airflow direction at a radial position measuring point at the outlet of a turbine performance test piece in the prior art.
[0020] Figure 6 This is a schematic diagram of the total pressure pipe structure for measuring the total pressure at the outlet of a turbine performance test piece, according to an embodiment of this application.
[0021] Figure 7 This is a top view of the circular cover plate and square mounting base of the main pressure pipe according to an embodiment of this application.
[0022] Figure 8 This is a schematic diagram showing the numbering of threaded holes on a square mounting base according to an embodiment of this application.
[0023] Figure 9 This is a schematic diagram showing the numbering of threaded holes on a circular cover plate according to an embodiment of this application.
[0024] Figure 10 This is a schematic diagram of a first fixing method according to an embodiment of this application.
[0025] Figure 11 This is a schematic diagram of a second fixing method according to an embodiment of this application.
[0026] Figure 12 This is a schematic diagram of a third fixing method according to an embodiment of this application.
[0027] Figure 13 This is a schematic diagram showing that the center line of the measuring hole at different radial positions on the total pressure pipe in this application has a certain angle with the direction of the turbine axis. Detailed Implementation
[0028] 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.
[0029] This application provides a rotatable total pressure pipe and a technical solution for non-axial arrangement of measuring holes on the total pressure pipe, in order to solve the problem of inaccurate total pressure measurement when the outlet airflow direction of the turbine performance test piece deviates too much from the axial direction in the prior art.
[0030] This application provides a measuring tube for measuring the total parameters of the outlet airflow of an axial turbine performance test piece. This measuring tube can be either a total pressure tube or a total temperature tube. The following embodiments of this application use a total pressure tube as an example for illustration. Figure 6 and Figure 7 As shown, the total pressure pipe 3 for measuring the total parameters of the outlet airflow of the axial turbine performance test piece of this application has a measuring hole 31 extending into the main flow channel, a circular cover plate 32, and a square mounting base 33.
[0031] The circular cover plate 32 and the main pressure pipe 3 are an integral structure. For example, the circular cover plate 32 and the main pressure pipe 3 can be fixed into a whole by welding.
[0032] The square mounting base 33 is fixed to the casing 13 of the turbine performance test piece. For example, the square mounting base 33 and the casing 13 can be fixed by welding or by bolt connection.
[0033] The circular cover plate 32 coincides with the center of the square mounting base 33, and the diameter of the circular cover plate 32 is smaller than the side length of the square mounting base 33. For example... Figure 7 The top view of the circular cover plate 32 and the square mounting base 33 shown is viewed from the blade tip to the blade root. The airflow flows from top to bottom. The circular cover plate 32 and the square mounting base 33 of the total pressure pipe 3 each have multiple threaded holes 36. Among them, the circular cover plate 32 and the square mounting base 33 are provided with two threaded holes 36 at symmetrical positions in the horizontal direction to put the measuring hole 31 in the initial position. The deflection threaded holes 36 are provided at positions that rotate clockwise and counterclockwise around the center of the circular cover plate 32 by a certain angle.
[0034] This embodiment of the application is illustrated using an example of a total of 6 threaded holes 36. Figure 8 and Figure 9As shown, the two horizontally symmetrical threaded holes 36 on the circular cover plate 32 are named G2, and the threaded holes 36 rotated clockwise and counterclockwise around the center of the circular cover plate 32 by a certain angle are named G1 and G3. Similarly, the two horizontally symmetrical threaded holes 36 on the square mounting base 33 are named A2, and the threaded holes 36 rotated clockwise and counterclockwise around the center of the circular cover plate 32 by a certain angle are named A1 and A3. The six threaded holes 36 on the circular cover plate 32 and the square mounting base 33 can overlap. It is understood that in this embodiment of the present application, one threaded hole 36 is provided around the center of the circular cover plate 32 by a certain angle rotated clockwise and counterclockwise. In other embodiments of the present application, two or more threaded holes 36 may also be provided around the center of the circular cover plate 32 by a certain angle rotated clockwise and counterclockwise, thereby improving the rotation angle range or rotation accuracy.
[0035] The main pressure pipe of this application has three fixing methods to achieve the rotation function of the main pressure pipe during use:
[0036] The first method involves overlapping threaded holes A1 and G1, A2 and G2, and A3 and G3. By using screws to select the four threaded holes A1G1 and A3G3, the main pressure pipe can be fixed. Figure 10 and Figure 13 As shown, at this time, the total pressure pipe 3 can accurately measure the airflow pressure within the rated range (±25°) between the intake direction and the axial direction.
[0037] The second method involves rotating the circular cover plate 32 of the main pressure pipe 3 clockwise. When threaded holes A1 and G2 overlap, threaded holes A2 and G3 overlap. By using screws to select the four threaded holes A1G2, A2G3, etc., the main pressure pipe 3 can be fixed. Figure 11 and Figure 13 As shown, at this time, the total pressure pipe 3 can accurately measure the airflow pressure that is outside the rated range on the right side of the intake direction and the axis direction.
[0038] The third method involves rotating the circular cover plate 32 of the main pressure pipe 3 counterclockwise. When threaded holes A2 and G1 overlap, threaded holes A3 and G2 also overlap. By using screws to select the four threaded holes A2G1, A3G2, etc., the main pressure pipe 3 can be fixed. Figure 12 and Figure 13 As shown, at this time, the total pressure pipe 3 can accurately measure the airflow pressure that exceeds the rated range on the left side of the intake direction and the axis direction.
[0039] The measuring tube provided in this application is arranged with a certain angle between the center line of the measuring hole and the turbine axis at different radial heights to adapt to different turbine outlet airflow direction ranges. Compared with the method of uniformly arranging the measuring holes in the same direction as the turbine axis, this application can further improve the overall airflow angle range measured by the total pressure tube.
[0040] 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 measuring tube for measuring the total outlet parameters of an axial flow turbine performance test piece, characterized in that, include: The measuring tube has a measuring hole extending into the main channel, a circular cover plate fixedly connected to the measuring tube, and a square mounting base fixedly connected to the turbine performance test piece casing. The center of the circular cover plate and the center of the square mounting base coincide, and multiple threaded holes are opened on both the circular cover plate and the square mounting base. The rotation of the measuring tube is achieved by adjusting the angle between the threaded holes of the circular cover plate and the threaded holes of the square mounting base relative to the center.
2. The measuring tube for measuring the total outlet parameters of an axial turbine performance test piece as described in claim 1, characterized in that, The measuring tube includes a total temperature tube and a total pressure tube.
3. The measuring tube for measuring the total outlet parameters of an axial turbine performance test piece as described in claim 1, characterized in that, The circular cover plate is fixed to the measuring tube by welding; the square mounting base is fixed to the turbine performance test specimen casing by welding.
4. The measuring tube for measuring the total outlet parameters of an axial turbine performance test piece as described in claim 1, characterized in that, The diameter of the circular cover plate is smaller than the side length of the square mounting base.
5. The measuring tube for measuring the total outlet parameters of an axial turbine performance test piece as described in any one of claims 1 to 4, characterized in that, The plurality of threaded holes include two threaded holes that are symmetrical about the turbine axis and at least one set of threaded holes that rotate clockwise and counterclockwise by a predetermined angle around the center of the circular cover plate.
6. The measuring tube for measuring the total outlet parameters of an axial turbine performance test piece as described in claim 5, characterized in that, When the circular cover plate overlaps with two threaded holes symmetrical about the turbine axis in the square mounting base, the measuring tube is fixed by connecting any other set of threaded holes through the connector, so that the measuring tube measures the airflow pressure or temperature in the intake direction and the axis direction within the rated range. When the circular cover plate and the two threaded holes in the square mounting base that are symmetrical about the turbine axis direction do not overlap, the measuring tube is fixed by connecting any other set of threaded holes through the connector, so that the measuring tube measures the airflow pressure or temperature in the intake direction and the axis direction that are outside the rated range.