Cascade wind tunnel air inlet attack angle automatic adjusting device and cascade wind tunnel

Abstract

The invention provides a cascade wind tunnel air inlet attack angle automatic adjusting device and a cascade wind tunnel, and belongs to the technical field of aero-engines, and the cascade wind tunnel air inlet attack angle automatic adjusting device comprises a wind tunnel body which is provided with an arc-shaped lead screw guide rail; the disc is provided with a sliding block matched with the arc-shaped lead screw guide rail; and the driving device is arranged on the wind tunnel main body and is in driving connection with the disc, and the driving device can drive the disc to rotate relative to the wind tunnel main body. The structure of an existing product is reasonably optimized, the stepping motor and the lead screw guide rail are utilized, the air inlet attack angle of the cascade is remotely and accurately adjusted, and compared with existing wind tunnel equipment of the same type with the attack angle manually adjusted, time and labor cost are greatly saved.

Description

Technical Field

[0001] The invention relates to the technical field of gas turbine engine testing, and in particular to a cascade wind tunnel with an automatic inlet attack angle adjustment device. Background Art

[0002] The cascade wind tunnel is a set of equipment and systems used to build a cascade wind blowing test environment. Its essence is to simulate and build the inlet flow field (airflow velocity, airflow direction) of the blade row, blow air on the blades, and measure relevant parameters of the wind tunnel test facility. There are four main methods for adjusting the inlet angle of attack (i.e., airflow direction) of existing cascade wind tunnel testers at home and abroad.

[0003] 1) Use several sets of fixed fixtures to clamp the blade cascade and install it in the wind tunnel flow field. Each set of fixtures corresponds to a fixed inlet angle of attack. This method is mostly used in small blade cascade wind tunnels. The test state cannot be continuously adjusted, the angle of attack replacement process is complicated, and only one fixed angle of attack test condition can be performed in one test.

[0004] 2) Using a disc as the installation device for the blade cascade, the disc is embedded in the wind tunnel body, and several rollers are arranged around the disc. The disc is then driven by a gear or a worm gear to rotate on the rollers to adjust the blade cascade inlet angle of attack. This method is difficult to achieve automatic control due to the large friction between the rollers and the wind tunnel body, and the rollers wear quickly. When replacing the rollers, the entire wind tunnel body often needs to be dismantled, which takes a lot of time and labor costs.

[0005] 3) The angle of attack is also adjusted by embedding the disc into the wind tunnel body, but the roller is replaced by a customized special guide rail, and the disc is driven to rotate by the planetary gear, which can easily achieve automatic adjustment of the disc rotation. However, due to the mechanical clearance between the guide rail and the planetary gear, slight vibration may occur during the operation of the wind tunnel, so the disc needs to be fixed with an external pressure block. Long-term testing will cause greater wear on the guide rail, and this structure also has the problem of difficulty in replacing the equipment after aging and wear.

[0006] 4) The inlet angle adjustment mechanism is also composed of a worm gear, a stepper motor and an arc screw guide, but the test device has no sealing structure, the adjustable angle is no more than 90°, and it does not have the ability to perform supersonic plane blade tests. Summary of the invention

[0007] In view of this, the embodiments of the present specification provide a cascade wind tunnel inlet attack angle automatic adjustment device and a cascade wind tunnel to improve the efficiency of the test.

[0008] The embodiments of this specification provide the following technical solutions: a device for automatically adjusting the inlet angle of attack of a blade wind tunnel, comprising: a wind tunnel main body, provided with an arc-shaped lead screw guide; a disc, provided with a slider that cooperates with the arc-shaped lead screw guide; a driving device, arranged on the wind tunnel main body and drivingly connected to the disc, wherein the driving device can drive the disc to rotate relative to the wind tunnel main body.

[0009] The present invention also provides a blade cascade wind tunnel, comprising the above-mentioned blade cascade wind tunnel inlet angle of attack automatic adjustment device.

[0010] Compared with the prior art, the beneficial effects that can be achieved by at least one of the above-mentioned technical solutions adopted in the embodiments of this specification include at least the following: the present invention reasonably optimizes the structure of existing products, and utilizes stepper motors and screw guides to achieve remote and precise adjustment of the intake angle of attack of the blade grid, which greatly saves time and labor costs for existing wind tunnel equipment of the same type that manually adjusts the angle of attack. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0012] Figure 1 is an assembly schematic diagram of an embodiment of the present invention;

[0013] Figure 2 yes Figure 1 Right view of;

[0014] Figure 3 yes Figure 2 AA section view.

[0015] The reference numerals in the figure are: 1. wind tunnel body; 2. disc; 3. stepping motor; 4. worm; 5. turbine; 6. worm mounting seat; 7. guide rail mounting window; 8. slider; 9. arc screw guide; 10. inflation sealing tube; 11. air nozzle; 12. pressure strip. DETAILED DESCRIPTION

[0016] The embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0017] The following describes the implementation methods of the present application through specific examples, and those skilled in the art can easily understand other advantages and effects of the present application from the contents disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The present application can also be implemented or applied through other different specific implementation methods, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present application. It should be noted that, in the absence of conflict, the following embodiments and the features in the embodiments can be combined with each other. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work belong to the scope of protection of the present application.

[0018] It should be noted that various aspects of the embodiments within the scope of the appended claims are described below. It should be apparent that the aspects described herein can be embodied in a wide variety of forms, and any specific structure and / or function described herein is merely illustrative. Based on the present application, it should be understood by those skilled in the art that an aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number and aspect described herein can be used to implement the device and / or practice the method. In addition, other structures and / or functionalities other than one or more of the aspects described herein can be used to implement this device and / or practice this method.

[0019] It should also be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present application. The illustrations only show the components related to the present application rather than being drawn according to the number, shape and size of the components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed at will, and the component layout may also be more complicated.

[0020] Additionally, in the following description, specific details are provided to facilitate a thorough understanding of the examples. However, it will be understood by those skilled in the art that the aspects described may be practiced without these specific details.

[0021] like Figures 1 to 3 As shown, the present invention provides a device for automatically adjusting the inlet attack angle of a cascade wind tunnel, comprising: a wind tunnel body 1, a disc 2 and a driving device. The wind tunnel body 1 is provided with an arc-shaped lead screw guide rail 9;

[0022] The disc 2 is provided with a slider 8 which cooperates with an arc-shaped lead screw guide rail 9; a driving device is arranged on the wind tunnel body 1 and drivingly connected to the disc 2, and the driving device can drive the disc 2 to rotate relative to the wind tunnel body 1.

[0023] By utilizing the driving device and the lead screw guide rail 9, the inlet angle of attack of the blade cascade can be adjusted remotely and accurately, which greatly saves time and labor costs for the existing wind tunnel equipment of the same type that manually adjusts the angle of attack.

[0024] Specifically, the driving device includes a stepper motor 3 , a worm 4 and a turbine 5 . The stepper motor 3 is fixedly arranged on the wind tunnel body 1 , the worm 4 is connected to the stepper motor 3 , and the turbine 5 is fixedly arranged on the disc 2 and can be connected with the worm 4 .

[0025] The drive device of the present invention realizes automatic adjustment of the blade inlet angle of attack through the precise coordination of the stepper motor 3, the worm 4 and the turbine 5. The stepper motor 3 is fixed on the wind tunnel body 1 and connected to the turbine 5 through the worm 4. The turbine 5 is fixed on the disc 2 to ensure the stable rotation of the disc. This design not only improves the accuracy and reliability of the adjustment, but also realizes the synchronization of the disc rotation through the control of the synchronous motor, thereby ensuring the precise adjustment of the blade angle of attack. In addition, the turbine worm has good self-locking ability, reduces the mechanical clearance and improves the stability of the system. Overall, the drive device is cleverly designed, easy to operate and maintain, and significantly improves the efficiency and accuracy of the blade wind tunnel test.

[0026] Preferably, two worm mounting seats 6 are provided at intervals on the wind tunnel body 1 , two ends of the worm 4 are mounted on the corresponding worm mounting seats 6 , and the stepping motor 3 is drivingly connected to either end of the worm 4 .

[0027] The arc-shaped lead screw guide rail 9 in the embodiment of the present invention is provided with a guide rail installation window 7 for assembling the slider 8 .

[0028] The guide rail installation window 7 is designed as an installation window with an angle of about 10° to facilitate the disassembly and assembly of the guide rail and the slider. Through this guide rail installation window 7, the arc screw guide rail 9 can be easily installed on the disc 2 to achieve free rotation of the disc, thereby adjusting the intake angle of the blade. The design of the guide rail installation window 7 not only simplifies the installation process of the guide rail and the slider, but also improves the flexibility of the system and the convenience of maintenance. This design enables the guide rail and the slider to be quickly replaced without removing the wind tunnel body, greatly improving the maintenance efficiency and service life of the equipment.

[0029] Preferably, there are multiple sliders 8 , which are spaced apart along the circumference of the disk 2 .

[0030] A sealing assembly is provided between the wind tunnel body 1 and the disc 2. The side wall of the disc 2 is provided with an installation receiving groove, and the sealing assembly includes: an inflatable sealing tube 10, which is provided in the installation receiving groove; a pressure strip 12, which is fixedly connected to the end surface of the disc 2 and can press the inflatable sealing tube 10 into the installation receiving groove; and an air nozzle 11, one end of which is connected to the inflatable sealing tube 10, and the other end of the air nozzle 11 passes through the pressure strip 12 and is placed on the outside of the disc 2.

[0031] The sealing assembly of the present invention achieves an efficient and reliable sealing effect between the disc 2 and the wind tunnel body 1 through the synergistic effect of the inflatable sealing tube 10, the pressure strip 12 and the air nozzle 11. The inflatable sealing tube 10 is arranged in the installation and receiving groove, and is fixedly connected to the end face of the disc 2 through the pressure strip 12, thereby ensuring the stability of the sealing tube when the disc rotates. One end of the air nozzle 11 is connected to the inflatable sealing tube, and the other end passes through the pressure strip and is placed on the outside of the disc, which is convenient for connecting the inflatable device. This design allows the inflatable sealing tube to expand and form a seal by controlling the inflatable device when the wind tunnel is running, and when the disc needs to rotate, the friction resistance is reduced by the deflation operation, thereby achieving flexible switching between sealing and rotation. On the whole, the sealing assembly is not only simple in structure and low in cost, but also easy to maintain, which significantly improves the sealing performance and operational convenience of the entire adjustment device.

[0032] There are two discs 2 and two driving devices, which are arranged on both sides of the wind tunnel body 1 in a mirror-symmetrical manner. The specific assembly process is as follows:

[0033] The arc screw guide rail 9 is installed on the disc 2. The threaded hole is processed on the wind tunnel body 1 to match the specifications of the slider 8. The disc 2 is fixed on the wind tunnel body 1 by 8 evenly distributed sliders 8. Figure 2 As shown, the slider 8 can be installed in turn from the guide rail installation window 7 to the arc screw guide rail 9. When designing the contact surface between the disc 2 and the wind tunnel body 1, a gap of 0.2-0.4 mm is reserved. This structure enables the disc to rotate freely under a small torque (determined according to the weight of the disc, a disc with a deadweight of no more than 0.5 t only needs a torque of 20 N / m).

[0034] Furthermore, after the installation of the disc 2 is completed, the inflatable sealing tube 10 is inserted into the groove on the outer edge of the disc 2 and pressed with the pressure strip 12. A round hole is drilled on the pressure strip 2 at a suitable position so that the air nozzle 11 can be led out and connected to the automatic inflating device. The structure performs the inflating operation when the wind tunnel is running, and the inflatable sealing tube 10 is fully expanded to play a good sealing role. When the wind tunnel stops running and the disc 2 needs to rotate, the deflation operation is performed, and the inflatable sealing tube 10 contracts to reduce the friction of the disc 2 rotating.

[0035] Furthermore, two turbines 5 are fixed on the disc 2, and bearings are put on the head and tail ends of the worm 4 and inserted into two worm mounting seats 6 respectively. The worm mounting seats 6 are fixed on the wind tunnel body 1. The worm 4 and the turbine 5 must be closely meshed to minimize the mechanical clearance. The head of the worm 4 is connected to the stepper motor 3 through a key, and the stepper motor 3 is also fixed to the worm mounting seat 6 through bolts and other fasteners. After the structure is installed, it is necessary to first adjust the blade installation windows on the two symmetrical discs 2 to a parallel position, and then connect the motor control program to ensure that there will be no relative position deviation when the two discs 2 rotate.

[0036] Furthermore, by setting parameters such as the rotation speed and overload protection torque in the stepper motor control program, and then calculating the corresponding relationship between the rotation angle of the stepper motor 3 and the rotation angle of the disc through the lead of the worm, the rotation angle of the disc 2 can be accurately adjusted on the remote control computer, thereby achieving the purpose of accurately adjusting the blade inlet angle of attack.

[0037] Finally, when the wearing parts of the present invention: the slider 8 and the inflation sealing tube 10 are damaged, it is only necessary to purchase the finished parts again on the market, remove the blocking plate and the pressure strip 12 of the slider installation window 7 on the disc 2, and complete the repair or replacement in a short time without touching other components of the wind tunnel body 1.

[0038] The present invention also provides a blade cascade wind tunnel, comprising the above-mentioned blade cascade wind tunnel inlet angle of attack automatic adjustment device.

[0039] By integrating the above-mentioned blade wind tunnel inlet angle of attack automatic adjustment device, the efficiency and accuracy of the test are significantly improved. The automatic adjustment function of the device makes the blade inlet angle of attack continuously adjustable, and with the precision control of the stepper motor and the screw guide rail, remote precision adjustment is achieved. At the same time, the drive mode of the worm gear and the synchronous motor ensures the synchronization and stability of the disc rotation. The use of the inflatable sealing tube not only improves the sealing effect, but also reduces the friction resistance during rotation. In addition, the convenient replacement design of the guide rail mounting window and wearing parts further simplifies the maintenance and repair process.

[0040] Overall, this blade wind tunnel design not only optimizes the test process and reduces operating costs, but also improves the flexibility and reliability of the test. It is a major innovation in the field of gas turbine engine test technology.

[0041] Each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the method embodiment described later, since it corresponds to the system, the description is relatively simple, and the relevant parts can be referred to the partial description of the system embodiment.

[0042] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. An automatic adjustment device for the inlet angle of attack of a cascade wind tunnel, It is characterized in that include: The wind tunnel body (1) is provided with an arc-shaped lead screw guide rail (9); The disc (2) is provided with a slider (8) which cooperates with the arc-shaped lead screw guide rail (9); A driving device is arranged on the wind tunnel body (1) and is drivingly connected to the disc (2), and the driving device can drive the disc (2) to rotate relative to the wind tunnel body (1).

2. The automatic adjustment device for the inlet angle of attack of a cascade wind tunnel according to claim 1, It is characterized in that The driving device comprises a stepping motor (3), a worm (4) and a turbine (5); the stepping motor (3) is fixedly arranged on the wind tunnel body (1); the worm (4) is connected to the stepping motor (3); and the turbine (5) is fixedly arranged on the disc (2) and can be matched and connected with the worm (4).

3. The automatic adjustment device for the inlet angle of attack of a cascade wind tunnel according to claim 2, It is characterized in that Two worm mounting seats (6) are arranged at intervals on the wind tunnel body (1), two ends of the worm (4) are mounted on the corresponding worm mounting seats (6), and the stepping motor (3) is drivingly connected to either end of the worm (4).

4. The automatic adjustment device for the inlet angle of attack of a cascade wind tunnel according to claim 1, It is characterized in that The arc-shaped lead screw guide rail (9) is provided with a guide rail installation window (7) for assembling the slider (8).

5. The automatic adjustment device for the inlet angle of attack of a cascade wind tunnel according to claim 1, It is characterized in that A sealing component is provided between the wind tunnel body (1) and the disc (2).

6. The automatic adjustment device for the inlet attack angle of a cascade wind tunnel according to claim 5, It is characterized in that The side wall of the disc (2) is provided with a mounting groove, and the sealing assembly comprises: An inflatable sealing tube (10) is arranged in the installation accommodating groove; A pressure strip (12) is fixedly connected to the end surface of the disc (2) and is capable of pressing the inflatable sealing tube (10) into the installation receiving groove; One end of the air nozzle (11) is connected to the inflation sealing tube (10), and the other end of the air nozzle (11) passes through the pressure strip (12) and is placed on the outer side of the disc (2).

7. The automatic adjustment device for the inlet attack angle of a cascade wind tunnel according to claim 1, It is characterized in that There are multiple sliders (8) which are arranged at intervals along the circumference of the disc (2).

8. The automatic adjustment device for the inlet attack angle of a cascade wind tunnel according to any one of claims 1 to 7, It is characterized in that There are two disks (2) and two driving devices, which are arranged on both sides of the wind tunnel body (1) in a mirror-symmetrical manner.

9. A cascade wind tunnel, comprising an automatic adjustment device for the inlet attack angle of the cascade wind tunnel, It is characterized in that The cascade wind tunnel air inlet angle automatic adjustment device is the cascade wind tunnel air inlet angle automatic adjustment device according to any one of claims 1 to 8.

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