A wind tunnel test model structure with a large slenderness ratio

Abstract

A wind tunnel test model structure with a high slenderness ratio belongs to the field of wind tunnel test vehicle design technology. It solves the problems of large vibration amplitude and low data accuracy in existing technologies during testing. Key technical points: The rectifier cap, front cylinder, and front port flange are sequentially bonded together, with the front port flange connected to the front end of the central steel shell; the rear port flange, rear end cylinder, and rear end plate are sequentially bonded together, with the rear port flange connected to the rear end of the central steel shell; a balance sleeve is fitted onto the balance, the central steel shell is fitted onto the balance sleeve, the balance front cone tension plate is connected to the central steel shell, the front end of the balance is connected to the balance front cone tension plate, and the rear end of the balance is connected to the tail end of the balance sleeve. This invention significantly reduces the vibration amplitude of the model structure during testing, avoids damage to the model and equipment caused by resonance, and improves the safety and stability of the entire wind tunnel high angle-of-attack test process; it effectively suppresses the interference of model vibration on measurement results, ensuring accurate and reliable test data acquisition.

Description

Technical Field

[0001] This invention relates to the field of wind tunnel test vehicle design technology, specifically a wind tunnel test model structure with a large aspect ratio. Background Technology

[0002] With the continuous development of wind tunnel testing technology at home and abroad, the test objects have expanded from conventional aircraft to unconventional aircraft structures with large slenderness ratios. These structures have an overall length much greater than their cross-sectional radius and are small damping systems. Under the action of wind tunnel flow fields, they are more sensitive to random aerodynamic excitation forces and are prone to structural excited vibrations.

[0003] Under existing wind tunnel testing technology, when conducting high angle-of-attack force measurement tests on models with a large slenderness ratio, if the excitation frequency is close to the model's natural frequency, severe vibrations are very likely to occur. This will directly lead to distortion of test data such as force and pressure measurements, affecting the accuracy of the test data. Moreover, severe vibrations pose safety hazards, easily causing damage to the test model and support structure. In severe cases, it may even endanger the safety of the main wind tunnel equipment and may even lead to damage to the model support system and the main body of the wind tunnel.

[0004] Therefore, there is an urgent need to propose a wind tunnel test model structure with a large slenderness ratio to solve the problems of large vibration amplitude and low data accuracy of the model structure during the test in the existing technology. Summary of the Invention

[0005] In view of the above facts, in order to solve the problems of large vibration amplitude and low data accuracy of the model structure during the test in the prior art, the present invention designs a wind tunnel test model structure with a large slenderness ratio.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A wind tunnel test model structure with a large slenderness ratio includes a rectifier cap, a front cylinder, a front port flange, a central steel shell, a balance sleeve, a balance, a rear port flange, a rear cylinder, a rear port plate, and a balance front cone tensioning plate.

[0008] The rectifier cap, front cylinder, and front port flange are bonded together in sequence, and the front port flange is connected to the front end of the central steel shell.

[0009] The rear port flange, rear end cylinder, and rear end plate are bonded together in sequence, and the rear port flange is connected to the rear end of the central steel shell.

[0010] The balance sleeve is fitted onto the balance, the central steel shell is fitted onto the balance sleeve, the front cone tensioning plate of the balance is connected to the central steel shell, the front end of the balance is connected to the front cone tensioning plate of the balance, and the rear end of the balance is connected to the tail end of the balance sleeve.

[0011] Furthermore, the central steel shell is designed with circular stops at the front and rear, and the front port flange and the rear port flange are respectively connected to the stops of the central steel shell.

[0012] Furthermore, both the central steel shell and the front cone tensioning plate of the balance are made of 30CrMnSiA material.

[0013] Furthermore, both the front and rear cylinders are made of carbon fiber composite material.

[0014] Furthermore, both the front and rear port flanges are made of aluminum alloy.

[0015] Furthermore, the rectifier cap is made of 7075 aluminum alloy.

[0016] The beneficial effects of this invention are as follows:

[0017] 1. This invention can significantly reduce the vibration amplitude of the model structure during the test, avoid damage to the model and equipment caused by resonance, and improve the safety and stability of the entire wind tunnel high angle of attack test process.

[0018] 2. This invention effectively suppresses the interference of model vibration on measurement results, ensuring accurate and reliable experimental data acquisition and meeting the stringent requirements of high-precision scientific research for wind tunnel test data.

[0019] 3. The front and rear cylinders of the present invention are distributed at the front and rear ends of the model structure. Under the premise of ensuring structural strength, the carbon fiber composite material has a lower density than aluminum alloy, which can effectively reduce weight and increase the natural frequency of the structure.

[0020] 4. The central steel shell of this invention is made of 30CrMnSiA material, which effectively bears the overall load, provides central stability for the model structure, and improves the natural frequency of the structure.

[0021] 5. The present invention achieves a weight distribution that is heavier in the center and lighter on both sides, which is more suitable for complex test conditions such as large angles of attack, provides stable and reliable model configuration support for force measurement tests at large angles of attack, and promotes the smooth development of aerodynamic research and engineering applications in related fields. Attached Figure Description

[0022] Figure 1 This is a general structural diagram of the present invention.

[0023] In the diagram: 1-rectifier cap, 2-front end cylinder, 3-front port flange, 4-central steel shell, 5-balance sleeve, 6-balance, 7-rear port flange, 8-rear end cylinder, 9-rear end plate, 10-balance front cone tensioning plate. Detailed Implementation

[0024] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0025] The terms "set up," "connect," and "fix" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, a direct connection, or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0026] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0027] Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0028] Example: A wind tunnel test model structure with a large slenderness ratio in this example includes a rectifier cap 1, a front cylinder 2, a front port flange 3, a central steel shell 4, a balance sleeve 5, a balance 6, a rear port flange 7, a rear cylinder 8, a rear plate 9, and a balance front cone tensioning plate 10.

[0029] The rectifier cap 1, the front cylinder 2, and the front port flange 3 are bonded together in sequence, and the front port flange 3 is connected to the front end of the central steel shell 4.

[0030] The rear port flange 7, the rear end cylinder 8, and the rear end plate 9 are bonded together in sequence, and the rear port flange 7 is connected to the rear end of the central steel shell 4.

[0031] The balance sleeve 5 is mounted on the balance 6, the central steel shell 4 is mounted on the balance sleeve 5, the front cone tension plate 10 of the balance is connected to the central steel shell 4 by screws, the front end of the balance 6 is connected to the front cone tension plate 10 of the balance by screws through a flange interface, and the rear end of the balance 6 is connected to the tail end of the balance sleeve 5 by screws.

[0032] More specifically: the central steel shell 4 is designed with circular stops at the front and rear, and the front port flange 3 and the rear port flange 7 are respectively connected to the stops of the central steel shell 4.

[0033] More specifically: the central steel shell 4 and the front cone tensioning plate 10 of the balance are both made of 30CrMnSiA material, providing greater rigidity and strength.

[0034] More specifically: both the front cylinder 2 and the rear cylinder 8 are made of carbon fiber composite material.

[0035] More specifically: both the front port flange 3 and the rear port flange 7 are made of aluminum alloy.

[0036] More specifically: the rectifier cap 1 is made of 7075 aluminum alloy.

[0037] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein; as long as there is no structural conflict, the various features in the specific embodiments disclosed in this application can be combined with each other in any way, and will not cause the substance of the corresponding technical solutions to deviate from the scope of the technical solutions of the present invention.

[0038] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A wind tunnel test model structure with a large slenderness ratio, characterized in that, Includes a rectifier cap (1), a front cylinder (2), a front port flange (3), a central steel shell (4), a balance sleeve (5), a balance (6), a rear port flange (7), a rear cylinder (8), a rear end plate (9), and a balance front cone tensioning plate (10). The rectifier cap (1), the front cylinder (2), and the front port flange (3) are bonded together in sequence, and the front port flange (3) is connected to the front end of the central steel shell (4); The rear port flange (7), the rear end cylinder (8), and the rear end plate (9) are bonded together in sequence, and the rear port flange (7) is connected to the rear end of the central steel shell (4); The balance sleeve (5) is fitted onto the balance (6), the central steel shell (4) is fitted onto the balance sleeve (5), the balance front cone tension plate (10) is connected to the central steel shell (4), the front end of the balance (6) is connected to the balance front cone tension plate (10), and the rear end of the balance (6) is connected to the tail end of the balance sleeve (5).

2. The wind tunnel test model structure with a large slenderness ratio according to claim 1, characterized in that, The central steel shell (4) is designed with circular stops at the front and rear, and the front port flange (3) and the rear port flange (7) are respectively connected to the stops of the central steel shell (4).

3. The wind tunnel test model structure with a large slenderness ratio according to claim 1, characterized in that, The central steel shell (4) and the front cone tensioning plate (10) of the balance are both made of 30CrMnSiA material.

4. The wind tunnel test model structure with a large slenderness ratio according to claim 1, characterized in that, Both the front cylinder (2) and the rear cylinder (8) are made of carbon fiber composite material.

5. The wind tunnel test model structure with a large slenderness ratio according to claim 1, characterized in that, Both the front port flange (3) and the rear port flange (7) are made of aluminum alloy.

6. The wind tunnel test model structure with a large slenderness ratio according to claim 1, characterized in that, The rectifier cap (1) is made of 7075 aluminum alloy.

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