A test platform for high-load low-pressure turbine plane cascade test

Abstract

The present application belongs to the field of turbine test of aero-engine, and discloses a test platform for high-load low-pressure turbine plane cascade test, which comprises a support table, a wake simulation mechanism, an angle of attack adjusting mechanism, a test section and a test section support mechanism. The wake simulation mechanism and the angle of attack adjusting mechanism are combined together to realize the function of simultaneously simulating the angle of attack and the unsteady wake of the incoming flow. Meanwhile, the wake simulation mechanism is supported at two points and separated from the test section, so that the structure is simplified and the problem of error caused by vibration of the existing test table to the test is solved.

Description

Technical Field

[0001] This invention belongs to the field of aero-engine turbine testing, and more specifically, relates to a test platform for testing high-load, low-pressure turbine planar blade cascades. Background Technology

[0002] As the economic requirements for high-bypass turbofan engines in civil applications continue to increase, it is necessary to reduce the number of low-pressure turbine blades and increase the load on the low-pressure turbine blades to reduce the weight of the aircraft engine. However, increasing the load on the low-pressure turbine may lead to a decrease in efficiency. To conduct research on high-load low-pressure turbines, a low-pressure turbine planar blade test rig that can simulate the real working environment of low-pressure turbine blades is needed.

[0003] However, existing low-pressure turbine planar blade cascade test rigs are functionally limited and cannot achieve simple adjustment of the wake simulation mechanism's angle. Therefore, they can only study one factor—the unsteady wake or the angle of attack—limiting their guiding role in low-pressure turbine design. Furthermore, existing low-pressure turbine planar blade cascade test rigs are heavy and structurally complex, making it difficult to achieve precise, simple, and labor-saving adjustment of the angle of attack. Additionally, the wake mechanism on existing test rigs is installed together with the test section, causing vibrations from the wake mechanism to be transmitted to the test section, introducing significant errors in experimental measurements.

[0004] Therefore, under the current circumstances, it is essential to provide a planar blade cascade test bench for testing high-load, low-pressure turbine blade profiles in civil high-bypass ratio aero engines. Summary of the Invention

[0005] In view of this, the present invention proposes a test platform for high-load low-pressure turbine planar blade cascade testing, the specific technical solution of which is as follows:

[0006] A test platform for high-load, low-pressure turbine planar blade cascade testing, comprising:

[0007] A support platform, wherein a left support base is fixed to the top of the left support and a right support base is fixed to the top of the right support;

[0008] A wake simulation mechanism includes a wake simulation mechanism frame, with a drive wheel assembly and a driven wheel assembly mounted on the upper and lower sides of the frame, respectively. The drive wheel assembly includes a first drive wheel and a second drive wheel arranged on the left and right sides, respectively. The driven wheel assembly includes a first driven wheel and a second driven wheel arranged on the left and right sides, respectively. The first drive wheel and the first driven wheel are connected by a first conveyor belt, and the second drive wheel and the second driven wheel are connected by a second conveyor belt. The first conveyor belt and the second conveyor belt drive synchronously, and several horizontally arranged metal cylindrical rods are connected between them. A left-side support is fixed to the left side of the wake simulation mechanism frame, and a right-side support is fixed to the right side. The left-side support is rotatably connected to the left-side support seat via a bearing component mounted on the left-side support seat.

[0009] An angle-of-attack adjustment mechanism, which is mounted on the right-side support and connected to the right-side support;

[0010] The test section, installed in the middle of the wake simulation mechanism frame, includes a test section frame and a test section mounting shaft. Test section cover plates are fixedly installed on the upper and lower sides of the test section frame, and test section side plates are fixedly installed on the left and right sides. Each of the two test section side plates has several mounting holes of the same shape and size as the planar blade cascade test piece. The planar blade cascade test piece passes through the mounting holes from the side and is inserted into the test section frame. The test section mounting shaft is fixedly connected to the outer side of the test section frame.

[0011] The test section support mechanism is fixedly installed on the bottom surface in the middle of the support platform to provide support for the test section mounting shaft.

[0012] By adopting the above technical solution, this invention combines the wake simulation mechanism with the angle-of-attack adjustment structure, realizing the function of simultaneously simulating the angle of attack and the unsteady wake of the incoming flow. Simultaneously, this invention also provides two-point support for the wake simulation mechanism, separating it from the test section, simplifying the structure and solving the problem of errors caused by vibration in existing test benches.

[0013] Preferably, the bottom or top end of the wake simulation mechanism frame is fixed with two left and right drive wheel supports, and a drive shaft is rotatably mounted between the two drive wheel supports. The drive shaft is driven to rotate by a transmission belt pulley, and the first drive wheel and the second drive wheel are fixedly mounted on the drive shaft. The top or bottom end of the wake simulation mechanism frame is fixed with two left and right driven wheel supports, and a driven shaft is rotatably mounted between the two driven wheel supports. The first driven wheel and the second driven wheel are fixedly mounted on the driven shaft.

[0014] Preferably, several of the metal cylindrical rods are installed at equal intervals between the first conveyor belt and the second conveyor belt.

[0015] Preferably, the bearing component on the left support is a self-aligning roller bearing.

[0016] Preferably, the angle of attack adjustment mechanism includes a reducer and an angle of attack adjustment rocker arm. The reducer is mounted on the right support base, the reducer drive shaft is connected to the angle of attack adjustment rocker arm, and the reducer output shaft is connected to the right support base.

[0017] Preferably, the reducer is a high reduction ratio RV reducer.

[0018] Preferably, the test section support mechanism includes a test section base, which is fixedly installed on the bottom surface in the middle of the support platform. A vertical rod is fixed on the upper part of the test section base, and an adjustable test section mounting shaft support structure is installed on the vertical rod.

[0019] Preferably, the test section mounting shaft support structure includes a lower support for the test section mounting shaft and an upper bearing shell. The lower support for the test section mounting shaft is fixed to the vertical rod by locking bolts, and the upper bearing shell cooperates with the lower support for the test section mounting shaft to provide installation space for the test section mounting shaft.

[0020] Preferably, the test section mounting shaft is adjusted using external tools to rotate the entire test section.

[0021] Preferably, an air inlet mechanism is installed at the rear of the support platform, and the air inlet of the air inlet mechanism faces the planar blade test piece.

[0022] By adopting the above technical solution, compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. This invention discloses a test platform for high-load, low-pressure turbine planar blade cascade testing, comprising a support platform, a wake simulation mechanism, an angle-of-attack adjustment mechanism, a test section, and a test section support mechanism. The wake simulation mechanism has two sets of synchronous pulleys, with two synchronous belts mounted on the pulleys. Several metal cylindrical rods are installed between the two synchronous belts, and the metal cylindrical rods are driven by a transmission pulley to generate a wake. Simultaneously, to provide space for the test section and flow channel, and to allow rotation for angle-of-attack adjustment, the wake simulation mechanism is supported on both sides. The left support is rotatably connected to the left support seat via a self-aligning roller bearing, and the right support is connected to the angle-of-attack adjustment mechanism. This invention combines the wake simulation mechanism and the angle-of-attack adjustment structure, achieving the function of simultaneously simulating the angle of attack and the unsteady wake of the incoming flow.

[0024] 2. In this invention, the angle of attack adjustment mechanism uses a high reduction ratio RV reducer, and the drive shaft of the RV reducer is connected to the angle of attack adjustment rocker, which realizes precise, simple and labor-saving adjustment of the angle of attack.

[0025] 3. In this invention, the test section is supported by bearing bushes, which can be rotated and fixed as a whole, so as to achieve synchronous angle of attack adjustment with the wake simulation mechanism.

[0026] 4. In this invention, the test section support mechanism and the wake simulation mechanism are separated, which can isolate the vibration generated during the operation of the wake simulation mechanism, thereby avoiding the adverse effects of vibration on the fine testing in the test section. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the overall structure of the test platform of the present invention. Figure 1 .

[0029] Figure 2 This is a schematic diagram of the overall structure of the test platform of the present invention. Figure 2 .

[0030] Figure 3 This is a partial structural schematic diagram of the test platform of the present invention.

[0031] Figure 4 This is a schematic diagram of the wake simulation mechanism of the test platform of the present invention.

[0032] Figure 5 This is a schematic diagram of the wake simulation mechanism (excluding the conveyor belt and metal cylindrical rod) of the test platform of the present invention.

[0033] Figure 6 This is a schematic diagram of the support structure of the test platform of the present invention.

[0034] Figure 7 This is a diagram showing the connection structure at the support base on the left side of the support platform.

[0035] Figure 8 This is a diagram of the connection structure at the support base on the right side of the support platform.

[0036] Figure 9 This is a schematic diagram of the test section and its supporting structure of the test platform of the present invention.

[0037] Figure 10This is a schematic diagram of the structure of the test section and its support mechanism of the test platform of the present invention after being rotated by a certain angle.

[0038] Figure 11 This is a schematic diagram of the angle-of-attack adjustment mechanism of the test platform of the present invention.

[0039] In the diagram: 1-Support platform, 2-Wake trajectory simulation mechanism, 3-Angle of attack adjustment mechanism, 4-Test section, 5-Test section support mechanism, 6-Left side support seat, 7-Right side support seat, 8-Wake trajectory simulation mechanism frame, 9-Driving wheel assembly, 10-Driven wheel assembly, 11-First driving wheel, 12-Second driving wheel, 13-First driven wheel, 14-Second driven wheel, 15-First conveyor belt, 16-Second conveyor belt, 17-Metal cylindrical rod, 18-Left side support, 19-Right side support, 20-Bearing component, 2 1-Test section frame, 22-Test section mounting shaft, 23-Test section cover plate, 24-Test section side plate, 25-Mounting hole, 26-Planar blade test piece, 27-Drive wheel support, 28-Drive shaft, 29-Transmission pulley, 30-Driven wheel support, 31-Driven shaft, 32-Reducer, 33-Angle of attack adjustment rocker arm, 34-Reducer drive shaft, 35-Test section base, 36-Vertical rod, 37-Test section mounting shaft lower support, 38-Upper bearing shell, 39-Locking bolt, 40-Air inlet mechanism. Detailed Implementation

[0040] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0041] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0042] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0043] Example:

[0044] like Figures 1-3 As shown, the present invention provides a test platform for high-load low-pressure turbine planar blade cascade testing, comprising a support platform 1, a wake simulation mechanism 2, an angle of attack adjustment mechanism 3, a test section 4, and a test section support mechanism 5.

[0045] Specifically,

[0046] like Figure 6 As shown, the left support seat 6 is fixed to the top of the left support of the support platform 1, and the right support seat 7 is fixed to the top of the right support.

[0047] like Figure 4 , Figure 5 As shown, the wake simulation mechanism 2 includes a wake simulation mechanism frame 8, with a drive wheel set 9 and a driven wheel set 10 installed on the upper and lower sides of the wake simulation mechanism frame 8, respectively. The drive wheel set 9 includes a first drive wheel 11 and a second drive wheel 12 arranged on the left and right, and the driven wheel set 10 includes a first driven wheel 13 and a second driven wheel 14 arranged on the left and right. The first drive wheel 11 and the first driven wheel 13 are connected by a first conveyor belt 15, and the second drive wheel 12 and the second driven wheel 14 are connected by a second conveyor belt 16. The first conveyor belt 15 and the second conveyor belt 16 are driven synchronously, and several horizontally arranged metal cylindrical rods 17 are connected between them.

[0048] Furthermore, two left-right drive wheel supports 27 are fixed at the bottom or top (bottom in this embodiment) of the wake simulation mechanism frame 8, and a drive shaft 28 is rotatably mounted between the two drive wheel supports 27. The drive shaft 28 is driven to rotate by a transmission belt pulley 29, and the first drive wheel 11 and the second drive wheel 12 are fixedly mounted on the drive shaft 28. Two left-right driven wheel supports 30 are fixed at the top or bottom (top in this embodiment) of the wake simulation mechanism frame 8, and a driven shaft 31 is rotatably mounted between the two driven wheel supports 30. The first driven wheel 13 and the second driven wheel 14 are fixedly mounted on the driven shaft 31.

[0049] Furthermore, such as Figure 4 As shown, several metal cylindrical rods 17 are installed at equal intervals between the first conveyor belt 15 and the second conveyor belt 16.

[0050] The left support 18 is welded to the left side of the wake simulation mechanism frame 8, and the right support 19 is welded to the right side. The two supports are installed on the left and right sides of the wake simulation mechanism frame 8 by welding, leaving space for the flow channel and test section 4 in the middle.

[0051] like Figure 7 As shown, the left support 18 is rotatably connected to the left support base 6 via a bearing component 20 provided on the left support base 6.

[0052] Furthermore, the bearing component 20 on the left support 6 is a self-aligning roller bearing.

[0053] like Figure 8 As shown, the angle of attack adjustment mechanism 3 is installed on the right support base 7 and connected to the right support 19.

[0054] Furthermore, such as Figure 11 As shown, the angle of attack adjustment mechanism 3 includes a reducer 32 and an angle of attack adjustment rocker arm 33. The reducer 32 is mounted on the right support 7. The reducer drive shaft 34 is connected to the angle of attack adjustment rocker arm 33. The reducer output shaft is connected to the right support 19.

[0055] Furthermore, the reducer 32 is a high reduction ratio RV reducer, which can easily and effortlessly adjust the angle of attack precisely.

[0056] like Figure 9 As shown, test section 4 is installed in the middle of the wake simulation mechanism frame 8, which includes test section frame 21 and test section mounting shaft 22; test section cover plate 23 is fixedly installed on the upper and lower sides of test section frame 21, and test section side plate 24 is fixed on the left and right sides by screws; several mounting holes 25 of the same shape and size as the planar blade test piece 26 are opened on the two test section side plates 24, and the planar blade test piece 26 passes through the mounting holes 25 from the side and is inserted into the test section frame 21; the test section mounting shaft 22 is fixedly connected to the outer side of test section frame 21.

[0057] The test section support mechanism 5 is fixedly installed on the bottom surface in the middle of the support platform 1 to provide support for the test section mounting shaft 22.

[0058] Furthermore, the test section support mechanism 5 includes a test section base 35, which is fixedly installed on the bottom surface in the middle of the support platform 1. The test section base 35 in this invention is made of heavy steel, which can lower the overall center of gravity and reduce the impact of vibration on the test. A vertical rod 36 is fixed on the upper part of the test section base 35, and an adjustable test section mounting shaft support structure is installed on the vertical rod 36.

[0059] The test section mounting shaft support structure includes a lower support 37 and an upper bearing shell 38. The lower support 37 is fixed to the vertical rod 36 by locking bolts 39. The upper bearing shell 38 cooperates with the lower support 37 to provide installation space for the test section mounting shaft 22. In use, the height of the test section mounting shaft support structure and the test section 4 as a whole can be adjusted by removing the locking bolts 39.

[0060] In this invention, the test section mounting shaft 22 is adjusted using external tools, as follows: Figure 10 The test section 4 shown is rotated as a whole.

[0061] An air inlet mechanism 40 is installed at the rear of the support platform 1, with the air inlet of the air inlet mechanism 40 facing the planar blade test piece 26.

[0062] Working principle of the invention:

[0063] The air inlet of the air inlet mechanism 40 is always kept horizontal, and the air inlet direction is kept constant. Then, the rotation angle of the wake simulation mechanism 2 is adjusted by the angle of attack adjustment mechanism 3, and the rotation angle of the test section 4 is adjusted by external tools to achieve synchronous angle of attack adjustment of the wake simulation mechanism 2 and the test section 4. At the same time, the transmission pulley 29 in the wake simulation mechanism 2 drives the metal cylindrical rod 17 to move and generate a wake, thus realizing the function of simulating the angle of attack and the unsteady wake of the incoming flow at the same time.

[0064] The present invention also provides two-point support for the wake simulation mechanism 2 and separates the test section support mechanism 5 from the wake simulation mechanism 2, which simplifies the structure and isolates the vibration generated by the wake simulation mechanism 2 during operation, thus avoiding the adverse effects of vibration on the fine testing in the test section 4.

[0065] Meanwhile, the invention introduces a large reduction ratio reducer 32 into the angle of attack adjustment mechanism 3, which makes the angle of attack adjustment more precise, simple, and labor-saving.

[0066] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0067] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A test platform for high-load, low-pressure turbine planar blade cascade testing, characterized in that, include: A support platform, wherein a left support base is fixed to the top of the left support and a right support base is fixed to the top of the right support; A wake simulation mechanism includes a wake simulation mechanism frame, with a drive wheel assembly and a driven wheel assembly mounted on the upper and lower sides of the frame, respectively. The drive wheel assembly includes a first drive wheel and a second drive wheel arranged on the left and right sides, respectively. The driven wheel assembly includes a first driven wheel and a second driven wheel arranged on the left and right sides, respectively. The first drive wheel and the first driven wheel are connected by a first conveyor belt, and the second drive wheel and the second driven wheel are connected by a second conveyor belt. The first conveyor belt and the second conveyor belt drive synchronously, and several horizontally arranged metal cylindrical rods are connected between them. A left-side support is fixed to the left side of the wake simulation mechanism frame, and a right-side support is fixed to the right side. The left-side support is rotatably connected to the left-side support seat via a bearing component mounted on the left-side support seat. An angle-of-attack adjustment mechanism, which is mounted on the right-side support and connected to the right-side support; The test section, installed in the middle of the wake simulation mechanism frame, includes a test section frame and a test section mounting shaft. Test section cover plates are fixedly installed on the upper and lower sides of the test section frame, and test section side plates are fixedly installed on the left and right sides. Each of the two test section side plates has several mounting holes of the same shape and size as the planar blade cascade test piece. The planar blade cascade test piece passes through the mounting holes from the side and is inserted into the test section frame. The test section mounting shaft is fixedly connected to the outer side of the test section frame. The test section support mechanism is fixedly installed on the bottom surface in the middle of the support platform to provide support for the test section mounting shaft; The bottom or top end of the wake simulation mechanism frame is fixed with two left and right drive wheel supports, and a drive shaft is rotatably mounted between the two drive wheel supports. The drive shaft is driven to rotate by a transmission belt pulley, and the first drive wheel and the second drive wheel are fixedly mounted on the drive shaft. The top or bottom end of the wake simulation mechanism frame is fixed with two left and right driven wheel supports, and a driven shaft is rotatably mounted between the two driven wheel supports. The first driven wheel and the second driven wheel are fixedly mounted on the driven shaft. The angle of attack adjustment mechanism includes a reducer and an angle of attack adjustment rocker arm. The reducer is mounted on the right support base, the reducer drive shaft is connected to the angle of attack adjustment rocker arm, and the reducer output shaft is connected to the right support base. The reducer is a high reduction ratio RV reducer.

2. The test platform for high-load, low-pressure turbine planar blade cascade testing according to claim 1, characterized in that, Several of the aforementioned metal cylindrical rods are installed at equal intervals between the first conveyor belt and the second conveyor belt.

3. The test platform for high-load, low-pressure turbine planar blade cascade testing according to claim 1, characterized in that, The bearing component on the left support is a self-aligning roller bearing.

4. The test platform for high-load, low-pressure turbine planar blade cascade testing according to claim 1, characterized in that, The test section support mechanism includes a test section base, which is fixedly installed on the bottom surface in the middle of the support platform. A vertical rod is fixed on the upper part of the test section base, and an adjustable test section mounting shaft support structure is installed on the vertical rod.

5. The test platform for high-load, low-pressure turbine planar blade cascade testing according to claim 4, characterized in that, The test section mounting shaft support structure includes a lower support for the test section mounting shaft and an upper bearing shell. The lower support for the test section mounting shaft is fixed to the vertical rod by locking bolts. The upper bearing shell cooperates with the lower support for the test section mounting shaft to provide installation space for the test section mounting shaft.

6. The test platform for high-load, low-pressure turbine planar blade cascade testing according to claim 1, characterized in that, The test section is rotated as a whole by adjusting the mounting shaft with the aid of external tools.

7. The test platform for high-load, low-pressure turbine planar blade cascade testing according to claim 1, characterized in that, An air inlet mechanism is installed at the rear of the support platform, with the air inlet of the air inlet mechanism facing the planar blade test piece.

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