Clamp for high-temperature vibration test of ceramic matrix composite turbine guide vane

Abstract

The invention relates to a clamp for a high-temperature vibration test of a ceramic matrix composite turbine guide vane, and aims to solve the problems that the test requirement of the high-temperature vibration test and effective cooling cannot be met in the prior art. The device comprises a high-temperature clamping assembly and a water cooling base. In the aspect of high-temperature testing, the high-temperature clamping assembly is composed of a split-half cover plate, an upper edge plate split-half positioning clamping block and a lower edge plate positioning clamping block, the tightness degree of the clamp is adjusted by adjusting a puller bolt and a threaded piece, stable positioning of the guide vane can be achieved in the axial direction, the radial direction and the circumferential direction, mechanical interference is reduced, and the structure frequency is adjusted. In the aspect of cooling, a multi-channel cooling system is arranged in the water-cooling base, and a nano composite material heat insulation plate is combined, so that high temperature is effectively isolated, and normal operation of the vibration test bed under the high-temperature condition is protected. The device is suitable for testing the vibration performance of the turbine guide vane in an environment of 1100 DEG C, and has the characteristics of high-temperature clamping capability, efficient heat dissipation performance and the like.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of high-temperature vibration test equipment, in particular to the field of high-temperature vibration test devices for ceramic matrix composite turbine vanes, and specifically relates to a clamp for high-temperature vibration test of ceramic matrix composite turbine vanes. BACKGROUND

[0002] With the continuous development of aero-engine technology, the demand for high-performance and lightweight materials is increasing. Ceramic matrix composite materials, due to their excellent high-temperature performance, low density and good oxidation resistance, are gradually applied in aero-engines and are one of the ideal materials for high-temperature components such as turbine vanes. The application of ceramic matrix composite materials significantly improves the efficiency and reliability of aero-engines, and at the same time puts forward higher requirements for their performance testing.

[0003] In aero-engines, turbine vanes are important high-temperature components with extremely harsh working environments. In order to ensure the reliability and stability of ceramic matrix composite turbine vanes in actual use, a series of performance tests under high-temperature environments must be carried out. Among them, high-temperature vibration test is a key link, which usually needs to simulate the high-temperature and vibration load that the vane bears under working conditions. The test needs to heat the vane to 1100℃ and apply vibration load to evaluate its high-temperature vibration performance and fatigue resistance. However, most of the current vibration test benches can only work normally near room temperature. This temperature difference poses a great challenge to the test equipment and clamping fixture.

[0004] The high-temperature vibration test clamping device in the prior art is mainly used for metal materials, and its design cannot meet the special requirements of ceramic matrix composite materials. Ceramic matrix composite materials have higher brittleness and smaller thermal expansion coefficient, and need more stable clamping and restraint methods in high-temperature environments. At the same time, the cooling effect of the existing test device is limited, and it is difficult to effectively isolate the influence of high temperature on the vibration test bench, which can easily lead to excessive temperature during the test process, affecting the normal operation of the equipment.

[0005] Therefore, there is an urgent need for a vibration test clamping device that can adapt to the high-temperature characteristics of ceramic matrix composite materials, meet the 1100℃ high-temperature test environment, and have high-efficiency cooling capacity, to ensure the accuracy of the test and the safety of the equipment. SUMMARY

[0006] In order to solve the problems in the prior art, the present application provides a clamp for high-temperature vibration test of ceramic matrix composite turbine guide vane, which can meet the test requirements in a high-temperature (1100 DEG C) environment, effectively isolate heat and dissipate heat, and ensure that the vibration test bench can normally work at a lower temperature (room temperature). The device of the present application fully considers the high-temperature characteristics of ceramic matrix composite materials, including high brittleness, poor impact resistance, low thermal expansion coefficient and other characteristics, adopts precise multidirectional positioning and cooling design, and ensures the stability of clamping and test accuracy.

[0007] The technical scheme of the present application is as follows:

[0008] A clamp for high-temperature vibration test of ceramic matrix composite turbine guide vane, comprising a high-temperature clamping assembly and a water-cooled base mounted on a vibration test bench, one end of the high-temperature clamping assembly being detachably connected with the water-cooled base through a threaded member;

[0009] The high-temperature clamping assembly comprises a split cover plate, a lower edge plate positioning clamp and an upper edge plate split positioning clamp, which are matched with the upper edge plate and the lower edge plate of the ceramic matrix composite turbine guide vane respectively to realize complete positioning in the axial, radial and circumferential directions.

[0010] The split cover plate is divided into two parts, and at least one of the split cover plates is provided with threaded holes in the axial and circumferential directions respectively, which are used to press the upper edge plate split positioning clamp through a tightening screw and realize clamping positioning in the axial and radial directions, and the lower edge plate positioning clamp is pressed in the radial direction through a threaded member.

[0011] Beneficial effects:

[0012] In view of the high-temperature characteristics of ceramic matrix composite materials, stable multidirectional clamping capability is provided; through the cold water channel and heat insulation design, the high-temperature heat flow is effectively isolated, and the vibration test bench can safely operate at room temperature; the clamping assembly adopts a modular structure, is suitable for multidirectional vibration test, reduces the manufacturing cost and improves the flexibility of the test device; the clamp assembly can simulate the actual installation state of the turbine guide vane in the aero-engine, and ensure the reliability and accuracy of the test results; the threaded members and the tightening bolts of the clamping assembly can adjust the tightness of the clamp and the ceramic matrix composite turbine guide vane, and adjust the overall natural frequency. BRIEF DESCRIPTION OF DRAWINGS

[0013] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the following embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0014] Figure 1 is an exploded view of a clamp for high temperature vibration test of ceramic matrix composite turbine vane according to an embodiment of the present application.

[0015] Figure 2 is an assembly view and an exploded view of a clamp assembly and ceramic matrix composite turbine vane according to an embodiment of the present application.

[0016] Figure 3 is a half cover plate structure view according to an embodiment of the present application.

[0017] Figure 4 is an upper edge plate positioning block structure view according to an embodiment of the present application.

[0018] Figure 5 is a lower edge plate positioning block structure view according to an embodiment of the present application.

[0019] Figure 6 is a water-cooled base structure view according to an embodiment of the present application.

[0020] Figure 7 is a cross-sectional view of a water-cooled base according to an embodiment of the present application.

[0021] Figure 8 is an assembly view of a clamp and ceramic matrix composite turbine vane according to an embodiment of the present application. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some examples of the present application, but not all the embodiments. The description of the at least one example embodiment is only illustrative, but not any limitation on the present application and its application or use. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without any creative work fall within the scope of protection of the present application.

[0023] The structure of a clamp for high temperature vibration test of ceramic matrix composite turbine vane according to the present application will be described in detail below with reference to the drawings.

[0024] Figure 1 is an exploded view of a clamp for high temperature vibration test of ceramic matrix composite turbine vane according to an embodiment of the present application. As Figure 1As shown, the fixture includes a high-temperature clamping assembly for clamping and positioning the ceramic matrix composite turbine vane and a water-cooled base 1 mounted on the vibration test bench for providing effective heat dissipation and heat insulation in a high-temperature environment to ensure that the test device operates within a normal temperature range. The water-cooled base 1 and one end of the high-temperature clamping assembly are detachably connected by threads. The high-temperature clamping assembly includes a split cover plate 3, a lower edge plate positioning clamp 9, and an upper edge plate split positioning clamp 4, which are respectively matched with the upper edge plate and the lower edge plate of the ceramic matrix composite turbine vane to achieve complete positioning in the axial direction X, the radial direction Z, and the circumferential direction Y. The split cover plate 3 is divided into two parts, at least one of which is provided with threaded holes in the X direction and the Y direction for clamping and positioning the upper edge plate split positioning clamp 4 from the top by tightening screws 8 in the X direction and the Y direction, and further clamping and positioning the lower edge plate positioning clamp 9 in the Z direction by threaded parts 7 from the top.

[0025] The split cover plate 3 is detachably connected to the upper edge plate of the water-cooled base 1 by a flange and a plurality of threaded parts. The threaded parts are suitable for high-temperature environments and include a bolt 71, a bolt gasket 72, a nut gasket 73, and a nut 74. The split cover plate 3 clamps the upper edge plate split positioning clamp 4 by tightening threaded parts, which include a bolt 81 and a bolt gasket 82.

[0026] The high-temperature clamping assembly and the water-cooled base can be provided with a nano-composite heat insulation plate 2 for isolating high temperatures and protecting the vibration test bench, further reducing heat transfer from the high temperature to the vibration test bench. The heat insulation plate 2 is preferably made of high-temperature-resistant ceramic fiber or nano-coated composite material, which has excellent heat insulation performance to effectively reduce heat transfer efficiency and protect the vibration table from long-term stable operation under high-temperature conditions.

[0027] The high-temperature clamping assembly is made of high-temperature-resistant ceramic material, and the water-cooled base 1 is cast from high-temperature alloy.

[0028] Figure 2 is a schematic view of the assembly of the clamping assembly of an embodiment of the present application and the ceramic matrix composite turbine vane. Figure 3 is a schematic view of the split cover plate structure of an embodiment of the present application. Figure 4 is a schematic view of the upper edge plate positioning clamp structure of an embodiment of the present application. Figure 5 is a schematic view of the lower edge plate positioning clamp structure of an embodiment of the present application. Figures 2-5As shown, the split cover plate 3 includes a first split cover plate 31 and a second split cover plate 32, and the upper edge plate split positioning clamp 4 includes a first upper edge plate split positioning clamp 41 and a second upper edge plate split positioning clamp 42. The first split cover plate 31 and the second split cover plate 32, the first upper edge plate split positioning clamp 41 and the second upper edge plate split positioning clamp 42, and the lower edge plate positioning clamp 9 can be respectively matched with the upper edge plate and the lower edge plate of the turbine vane to realize positioning and clamping of the turbine vane in the axial direction X, the radial direction Z, and the circumferential direction Y.

[0029] As shown in Figure 2 or Figure 3 , the split cover plate 3 is of a split structure and is composed of two separate half cover plates, i.e., the first split cover plate 31 and the second split cover plate 32. Each split cover plate is fixedly connected with the water-cooled base 1 through a threaded member at a positioning hole 302 to provide a radial Z-direction pressing force. At least one of the split cover plates is provided with a threaded hole 301 in the X-direction and the Y-direction, respectively, for screwing in a jacking screw. The jacking screw exerts a clamping force on the upper edge plate split positioning clamp 4 in the radial direction and the circumferential direction to realize axial X and circumferential Y limiting and clamping of the upper edge plate split positioning clamp 4. Since the edge plate of the turbine vane is inclined, the pressing force of the split cover plate 3 in the Z-direction can further limit the displacement of the edge plate and the lower edge plate positioning clamp 9 in the XY direction, thereby improving the stability of clamping and the positioning accuracy. A central accommodating hole 303 is designed, and the shape of the hole is determined according to the ceramic-based turbine vane profile to avoid direct contact between the blade and the clamp.

[0030] As shown in Figure 2 or Figure 4 , the upper edge plate split positioning clamp 4 is composed of two positioning clamps, i.e., the first upper edge plate split positioning clamp 41 and the second upper edge plate split positioning clamp 42, which can be accurately matched with the upper edge plate of the turbine vane. One side of the first upper edge plate split positioning clamp 41 and the second upper edge plate split positioning clamp 42 is respectively inserted with a first ceramic gasket 51 and a second ceramic gasket 52 (shown by reference numeral 5 in Figure 1 ), which are respectively used for contacting the first split cover plate 31 and the second split cover plate 32, and the opposite side is attached to the upper edge plate of the turbine vane to realize stable clamping of the upper edge plate of the turbine vane through the pressing and fixing of the threaded member acting on the split cover plate. The upper edge plate split positioning clamp 4 is designed with a central accommodating hole 401 for completely accommodating the blade of the turbine vane to avoid direct contact between the blade and the clamp, reduce mechanical interference, and ensure test accuracy.

[0031] As shown in Figure 2 or Figure 4 , the lower edge plate positioning clamp 9 is in contact with the lower edge plate of the turbine vane, and a edge plate positioning groove 91 is arranged at the contact position (as shown in Figure 5As shown, the positioning groove 91 is designed according to the profile of the lower edge plate of the turbine vane. The lower edge plate positioning clamp block 9 is used to provide support for the lower part of the turbine vane, and cooperates with the water-cooled base 1 to achieve the heat insulation and heat dissipation functions, thereby avoiding the influence of high temperature on the vibration test bed during the test.

[0032] Figure 6 The water-cooled base structure diagram of an embodiment of the present application is shown in FIG. 1. As shown, the water-cooled base 1 includes a base column segment 11, an extended column segment 12, a rib plate 13, and a cooling channel. The base column segment 11 and the extended column segment 12 are connected as a whole through an intermediate edge plate 15, and are used to bear and provide stable support for the high-temperature clamping assembly. The water-cooled base 1 is fixed in position with the vibration test bed through a positioning hole 14. The core function of the water-cooled base is to achieve efficient heat dissipation through the internal cooling channel. An edge plate is provided above the extended column segment 12, which is the edge plate between the water-cooled base 1 and the high-temperature clamping assembly, and is provided below the heat insulation gasket 2. Figure 6

[0033] The cross-sectional view of the water-cooled base of an embodiment of the present application is shown in FIG. 2. As shown, at least four through cooling channels that are non-intersecting and are vertical or parallel are provided inside the base column segment 11, which ensures uniform heat dispersion. The inner diameter of the cooling channel is preferably 10-15 mm. Figure 7 As shown, the cooling channel 101 and the cooling channel 102 are non-intersecting. Each cooling channel has an independent water inlet and a water outlet, which are symmetrically distributed on opposite sides of the base column segment and are connected to an external circulating cooling device, so that the cooling liquid passes through at the optimal flow rate, further improving the cooling efficiency. The channels are staggered at different heights, which maximizes the cooling efficiency and avoids thermal interference between the channels. Figure 7 Figure 7 As shown, the base column segment and the extended column segment form a stable support structure through the rib plate 13 structure, and the rib plate design can further enhance the heat dissipation capacity of the water-cooled base. The rib plate is preferably made of a high-thermal-conductivity alloy material, such as GH4169, to ensure strength and stability in a high-temperature environment.

[0034] As shown, the edge plate between the water-cooled base 1 and the high-temperature clamping assembly is provided with a groove 16 for installing the lower edge plate positioning clamp block 9, which is positioned in the axial direction (X) and the circumferential direction (Y). Figure 6 As shown, the edge plate between the water-cooled base 1 and the high-temperature clamping assembly has a positioning hole 17 for fixing the half cover plate through a threaded member.

[0035] Figure 6 As shown, the edge plate between the water-cooled base 1 and the high-temperature clamping assembly has a positioning hole 17 for fixing the half cover plate through a threaded member.

[0036] As shown, the edge plate between the water-cooled base 1 and the high-temperature clamping assembly has a positioning hole 17 for fixing the half cover plate through a threaded member. Figure 6 As shown, the edge plate between the water-cooled base 1 and the high-temperature clamping assembly has a positioning hole 17 for fixing the half cover plate through a threaded member.​​

[0037] Reference Figure 8 The detailed installation process of the clamp for high-temperature vibration test of a ceramic matrix composite turbine vane of the present application is as follows:

[0038] Position the lower edge plate positioning clamp 9 to the groove 16 of the water-cooled base 1, and ensure that it fits the water-cooled base plane, i.e., the edge plate plane between the water-cooled base 1 and the high-temperature clamping assembly.

[0039] Position the lower edge plate of the turbine vane in the positioning groove 91 of the lower edge plate positioning clamp 9, and ensure that the vane fits the positioning clamp accurately.

[0040] Temporarily fix the upper edge plate half-positioning clamp 4 to the upper edge plate of the turbine vane, and cover the upper edge plate half-positioning clamp 4 with the half-cover plate 3.

[0041] Align the positioning hole 302 and the positioning hole 17, fix the half-cover plate 3, the nanocomposite heat insulation plate 2, and the water-cooled base 1 with the threaded fastener 7, and gradually tighten the threaded fastener 7 to apply clamping force to the ceramic gasket 5, the upper edge plate half-positioning clamp 4, and the lower edge plate positioning clamp 9 in the radial Z direction.

[0042] Tighten the screws in the threaded holes 301 of the half-cover plate 3 in the X and Y directions, adjust the screw compression force, and enable the upper edge plate half-positioning clamp 4 to achieve clamping and positioning in the XY direction.

[0043] After the installation is completed, the ceramic matrix composite turbine vane blade is completely contained in the central containment hole without direct contact or mechanical interference.

[0044] The cooling system of the water-cooled base works through an external cooling liquid source. The cooling liquid enters from the water inlet of the base column segment, absorbs the high-temperature heat transferred during the test process through the cooling channel, and is discharged from the water outlet, achieving efficient heat dissipation. The cooling channels in the base column segment and the extension column segment work cooperatively to ensure that the water-cooled base remains at a low temperature during the test process.

[0045] The clamp of the present application adopts a modular design. Different direction vibration tests can be realized by quickly replacing specific clamp assembly, and the remaining devices can remain unchanged. Specifically, the upper edge plate clamp and the lower edge plate clamp are detachable modules, which can be replaced with different size or angle assemblies according to test requirements, quickly adapting to different specifications of turbine vane test pieces. In addition, the modular design also supports independent cleaning and maintenance of the clamp assembly after the test is completed, significantly reducing the maintenance cost and use difficulty. The modular design reduces the use cost of the test device, facilitates the cleaning of the test device, and improves the applicability and test efficiency.

[0046] In the description provided herein, numerous specific details are set forth. However, it is understood that embodiments of the application can be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.

[0047] Although the application has been described in accordance with the embodiments shown, one of ordinary skill in the art will readily recognize that there could be variations to the embodiments and those variations would be within the spirit of the application. For example, the application could be implemented in hardware, software or a combination thereof. In addition, where the application is implemented as a computer program, the computer program could be implemented in a variety of programming languages, including C, C++, Java, and Pascal. Therefore, although the application has been described in detail with reference to only a few embodiments, it should be apparent that variations and modifications of those embodiments are possible. Accordingly, the scope of the application should be limited only by the appended claims and their equivalents.

Claims

1. A fixture for high-temperature vibration testing of ceramic matrix composite turbine guide vanes, characterized in that, It includes a high-temperature clamping assembly and a water-cooled base (1) mounted on a vibration test bench. One end of the high-temperature clamping assembly is detachably connected to the water-cooled base (1) via a threaded part. The high-temperature clamping assembly includes a split cover plate (3), a lower edge plate positioning clamp (9), and an upper edge plate split positioning clamp (4). The split cover plate (3), the lower edge plate positioning clamp (9), and the upper edge plate split positioning clamp (4) respectively cooperate with the upper edge plate and the lower edge plate of the ceramic matrix composite turbine guide vane to achieve complete positioning in the axial, radial, and circumferential directions. The split cover plate (3) is divided into two parts, and at least one of the split cover plates is provided with threaded holes in the axial and circumferential directions, which are used to press the upper edge plate split positioning clamp (4) with the tightening screw (8) and achieve clamping and positioning in the axial and radial directions, while pressing the lower edge plate positioning clamp (9) in the radial direction with the threaded part (7).

2. The fixture for high-temperature vibration testing of ceramic matrix composite turbine guide vanes according to claim 1, characterized in that, One surface of the lower edge plate positioning clamp (9) is provided with an edge plate positioning groove, which contacts the lower edge plate of the turbine guide vane, and the other surface opposite it contacts the plane of the water-cooled base (1).

3. The fixture for high-temperature vibration testing of ceramic matrix composite turbine guide vanes according to claim 1 or 2, characterized in that, The upper edge plate split positioning clamp (4) has a receiving hole in the center to completely accommodate the blade of the turbine guide vane and avoid direct contact between the blade and the clamp.

4. The fixture for high-temperature vibration testing of ceramic matrix composite turbine guide vanes according to claim 1 or 2, characterized in that, A nanocomposite heat insulation plate (2) is provided between the high-temperature clamping assembly and the water-cooled base (1) to isolate the high temperature and protect the vibration test bench.

5. The fixture for high-temperature vibration testing of ceramic matrix composite turbine guide vanes according to claim 1, characterized in that, The split cover plate (3) presses the assembled ceramic gasket (5), the lower edge plate positioning clamp (9) and the upper edge plate split positioning clamp (4) radially, and is fixed to the water-cooled base (1) and the nanocomposite heat insulation plate (2) by threaded parts (7).

6. The fixture for high-temperature vibration testing of ceramic matrix composite turbine guide vanes according to claim 1, characterized in that, The water-cooled base (1) includes a base column, an extension column and multiple ribs. The base column has at least four non-planar vertical or parallel cooling channels inside. Each channel has an independent inlet and outlet. The cooling channels are arranged at different heights and are not interconnected.

7. The fixture for high-temperature vibration testing of ceramic matrix composite turbine guide vanes according to claim 6, characterized in that, The inner diameter of the cold water channel is 10-15 mm.

8. The fixture for high-temperature vibration testing of ceramic matrix composite turbine guide vanes according to claim 6, characterized in that, The ribs are made of a high thermal conductivity alloy material.

9. The fixture for high-temperature vibration testing of ceramic matrix composite turbine guide vanes according to claim 1, characterized in that, The high-temperature clamping assembly is made of high-temperature resistant ceramic material, and the water-cooled base (1) is cast from a high-temperature alloy.

10. The fixture for high-temperature vibration testing of ceramic matrix composite turbine guide vanes according to claim 1, characterized in that, The split cover plate (3) is designed with a central receiving hole (303), the shape of which is determined according to the blade shape of the ceramic-based turbine guide vane to avoid direct contact between the blade body and the clamp. The split positioning clamp block (4) of the upper edge plate is designed with a central receiving hole (401) to completely accommodate the blade body of the ceramic-based turbine guide vane and avoid direct contact between the blade body and the clamp.

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