Test model structure capable of adjusting position in wind tunnel flow field

Abstract

The utility model discloses a test model structure capable of adjusting the position in a wind tunnel flow field. The test model structure comprises a model front section, a model rear section, a switching taper sleeve, a balance heat insulation taper sleeve, a balance and screws. The model front section and the model rear section are combined to form a shell of the test model; the switching taper sleeve, the balance heat insulation taper sleeve, the balance and the supporting rod are arranged in a shell formed by combining the model front section and the model rear section; the outer wall of the adapter taper sleeve is matched with the inner wall of the model rear section, and connecting holes of the adapter taper sleeve and the model rear section are formed in different axial positions of the adapter taper sleeve; the inner wall of the switching taper sleeve is matched with a balance through a balance heat insulation taper sleeve; and the balance is tightly pulled with the adapter block by using a screw. The device is simple in structure and convenient to process, and the relative position of the balance in the inner cavity of the model can be flexibly adjusted, so that the position of the test model in a wind tunnel flow field is adjusted, and the model is ensured to realize required posture change in a uniform area of the flow field.

Description

Technical Field

[0001] This utility model relates to an adjustable test model structure in a wind tunnel flow field, belonging to the technical field of wind tunnel test models. Background Technology

[0002] Wind tunnel testing, as one of the fundamental methods in the scientific design of spacecraft, can accurately measure the aerodynamic characteristics of spacecraft and conduct in-depth research on their complex flow phenomena, providing verification basis for the design and validation of aerodynamic configurations. Wind tunnel testing requires the design of test models according to similarity criteria and scaled-down designs. Furthermore, to ensure the accuracy and validity of the data, the model must remain within the uniform region of the wind tunnel flow field throughout the entire test. However, the stroke range of the wind tunnel attitude control mechanism is limited, and the wind tunnel adapter struts are generally of fixed length. Under certain extreme conditions, the model may approach the boundary of the uniform region of the flow field or extend beyond it, thus affecting the quality of the test data. The risks under these extreme conditions cannot be accurately predicted during the model design phase. Therefore, it is necessary to design a model structure that can flexibly adjust the position of the test model in the wind tunnel flow field according to the needs of the test attitude.

[0003] Furthermore, to save costs, or to eliminate the influence of model fabrication and to compare test data from different wind tunnels, the same model is often tested in different wind tunnels. The attitude control mechanisms and strut lengths differ between wind tunnels, and to ensure the model simultaneously meets the uniformity requirements of each wind tunnel, it needs to be designed with an adjustable structure in the flow field. Another type of test, where the accurate measurement of an aircraft's aerodynamic performance is highly sensitive to the relative positions of the balance center and the model's center of gravity, also requires a flexible and adjustable model design. Utility Model Content

[0004] The purpose of this invention is to overcome the above-mentioned defects and provide an adjustable test model structure in the wind tunnel flow field. This solves the problem of ensuring that the model is always in the uniform flow field region under different conditions. This invention has a compact structure, is easy to process, and is highly applicable. It can be used for test models with different shapes, and provides a guarantee for ensuring that the model is always in the uniform region and ensuring the validity and accuracy of the test data.

[0005] To achieve the above-mentioned utility model objectives, this utility model provides the following technical solution: an adjustable test model structure in a wind tunnel flow field, the test model structure comprising a front section of the model, a rear section of the model, a transition cone sleeve, a balance heat insulation cone sleeve, and a balance;

[0006] The front and rear sections of the model combine to form the outer shell of the experimental model;

[0007] The adapter cone sleeve, the balance insulation cone sleeve, and the balance are located inside the outer shell formed by the combination of the front and rear sections of the model.

[0008] The rear end of the adapter cone sleeve is connected to the balance via a heat-insulating cone sleeve. The outer wall of the adapter cone sleeve is connected to the inner wall of the rear section of the model. Connecting pin holes are set at different positions along the axial direction of the adapter cone sleeve. A pin hole is set at a fixed position on the rear section of the model. One of the connecting pin holes on the adapter cone sleeve is aligned with the fixed pin hole on the rear section of the model. The adapter cone sleeve and the rear section of the model are positioned and fastened by connecting pins. The position of the connecting pins is used to adjust the axial position relative to the rear section of the model. The balance is fixedly connected to the adapter cone sleeve.

[0009] Preferably, the adapter cone sleeve is an axisymmetrically rotated body.

[0010] Preferably, the outer diameter of the adapter cone sleeve is d and the length is L, and d and L satisfy the following relationship: L2≥2d2.

[0011] Preferably, the inner cavity of the adapter cone sleeve is provided with a cone hole that mates with the heat insulation cone sleeve of the balance.

[0012] Preferably, the balance and the adapter cone sleeve are fixedly connected by screws. The front end of the balance is provided with a first screw mounting hole, and the adapter cone sleeve is provided with a second screw mounting hole. The second screw mounting hole is connected to the cone hole at the front end of the adapter cone sleeve that mates with the heat-insulating cone sleeve of the balance.

[0013] The screw passes through the second screw mounting hole and the cone hole in sequence from the front end of the adapter cone sleeve, and then engages with the first screw mounting hole to achieve a fixed connection between the balance and the adapter cone sleeve.

[0014] Preferably, the coaxiality deviation between the tapered hole and the second screw mounting hole is less than 3′.

[0015] Preferably, a clamping washer and a heat insulation washer are arranged sequentially from front to back between the screw head and the front end of the adapter tapered sleeve.

[0016] Preferably, the adapter cone sleeve is inserted from the front end of the rear section of the model and is positioned and secured to the rear section of the model using a connecting pin; the balance insulation cone sleeve and the balance are inserted into the adapter cone sleeve from the rear end of the rear section of the model; the front section of the model is fitted from the front end of the rear section of the model and is positioned and secured using a connecting pin.

[0017] Preferably, the inner diameter of the front section of the model and the outer diameter of the rear section of the model are matched, and the coaxiality deviation during the fit is less than 3′.

[0018] Preferably, the outer diameter of the adapter cone sleeve matches the inner diameter of the rear section of the model, and the coaxiality deviation during fitting is less than 3′.

[0019] Compared with the prior art, the present invention has at least one of the following advantages:

[0020] (1) This utility model achieves the position adjustment of the model relative to the balance support rod by designing a separate axially movable transition cone sleeve, thereby realizing the adjustment of the model's position in the wind tunnel flow field, which provides a guarantee for ensuring that the model is always in the uniform flow field region and ensuring the validity and accuracy of the test data.

[0021] (2) This utility model solves the problem of size adaptability when using the same model for comparative tests in different wind tunnels, while saving economic costs; This utility model also addresses the problem of flexible adjustment to match test requirements for tests related to the measurement accuracy of aircraft and the height of the balance centering position.

[0022] (3) This utility model has a compact structure, is easy to process and has high precision control. It is also highly applicable and can be widely used for test models with different shapes. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of an experimental model structure that can adjust its position in a wind tunnel flow field according to the present invention;

[0024] In the diagram, 1-front section of the model, 2-rear section of the model, 3-adapter cone sleeve, 4-balance heat insulation cone sleeve, 5-balance, 6-heat insulation gasket, 7-compression gasket, 8-screw.

[0025] Figure 2 The experimental model of this utility model is relative to Figure 1 A schematic diagram of the structure after adjusting the axial position of the adapter tapered sleeve; Detailed Implementation

[0026] The features and advantages of this utility model will become clearer and more explicit through the following detailed description.

[0027] like Figure 1 As shown, this utility model provides an adjustable test model structure in a wind tunnel flow field, including a front section 1, a rear section 2, a transition cone sleeve 3, a balance heat insulation cone sleeve 4, a balance 5, and screws 8; the balance 5 is connected to the support rod.

[0028] The front section 1 and the rear section 2 of the model are combined to form the outer shell of the experimental model;

[0029] The adapter cone sleeve 3, the balance heat insulation cone sleeve 4, and the balance 5 are located inside the outer shell formed by the combination of the front section 1 and the rear section 2 of the model.

[0030] The rear end of the adapter cone sleeve 3 is connected to the balance 5 via the heat-insulating cone sleeve 4 of the balance. The outer wall of the adapter cone sleeve 3 is connected to the inner wall of the rear section 2 of the model. The adapter cone sleeve 3 is provided with connecting pin holes at different positions along the axial direction. The rear section 2 of the model is provided with a fixed pin hole. One of the connecting pin holes on the adapter cone sleeve 3 is aligned with the fixed pin hole of the rear section 2 of the model. The adapter cone sleeve 3 and the rear section 2 of the model are positioned and fastened by the connecting pin. The position of the connecting pin is used to adjust the axial position relative to the rear section 2 of the model. The balance 5 is fixedly connected to the adapter cone sleeve 3.

[0031] The outer wall of the adapter cone sleeve 3 mates with the inner wall of the rear section 2 of the model; the rear end of the adapter cone sleeve 3 mates with the balance 5 through the balance heat insulation cone sleeve 4; the balance 5 is fixedly connected to the adapter cone sleeve 3 using screws 8.

[0032] Preferably, the inner diameter of the front section 1 of the model and the outer diameter of the rear section 2 of the model are matched, and the coaxiality deviation during the fit is less than 3′; the outer diameter of the adapter cone sleeve 3 and the inner diameter of the rear section 2 of the model are matched, and the coaxiality deviation during the fit is less than 3′; the inner diameter of the front section 1 of the model is always greater than the outer diameter of the adapter cone sleeve 3, and the gap is greater than 1mm.

[0033] Preferably, the outer diameter of the adapter cone sleeve 3 is d and the length is L, and d and L satisfy the following relationship: L≥2d.

[0034] Preferably, the adapter tapered sleeve 3 is an axisymmetrically rotated body, and the radial position of its connecting pin hole is not restricted.

[0035] Preferably, the inner cavity of the adapter cone sleeve 3 is provided with a cone hole that mates with the balance heat insulation cone sleeve 4.

[0036] Preferably, the balance 5 and the adapter cone sleeve 3 are fixedly connected by screws 8. The front end of the balance 5 is provided with a first screw mounting hole, and the adapter cone sleeve 3 is provided with a second screw mounting hole. The second screw mounting hole is connected to the cone hole at the front end of the adapter cone sleeve 3 that mates with the heat insulation cone sleeve 4 of the balance.

[0037] Screw 8 passes through the second screw mounting hole and the conical hole sequentially from the front end of the adapter cone sleeve 3 and then engages with the first screw mounting hole to achieve a fixed connection between the balance 5 and the adapter cone sleeve 3.

[0038] The coaxiality deviation between the tapered hole and the second screw mounting hole is less than 3′.

[0039] Preferably, a clamping washer 7 and a heat insulation washer 6 are arranged sequentially from front to back between the head of the screw 8 and the front end of the adapter cone sleeve 3.

[0040] Preferably, the adapter cone sleeve 3 is inserted from the front end of the rear section 2 of the model and is positioned and fastened to the rear section 2 of the model using a connecting pin; the balance insulation cone sleeve 4 and the balance 5 are inserted from the rear end of the rear section 2 of the model into the adapter cone sleeve 3; the front section 1 of the model is fitted from the front end of the rear section 2 of the model and is positioned and fastened to the front section 1 using a connecting pin.

[0041] Preferably, when it is necessary to adjust the position of the balance relative to the model, the axially moving adapter cone sleeve 3 is used. Since the adapter cone sleeve 3 has connecting pin holes at different axial positions, a suitable pin hole is selected and aligned with the pin hole fixed to the rear section 2 of the model, and then positioned and tightened. Figure 2 This allows for the adjustment of the relative positions of the model and the balance, thereby enabling position adjustment within the wind tunnel flow field.

[0042] The present invention has been described in detail above with reference to specific embodiments and exemplary examples; however, these descriptions should not be construed as limiting the present invention. Those skilled in the art will understand that various equivalent substitutions, modifications, or improvements can be made to the technical solutions and implementation methods of the present invention without departing from the spirit and scope of the present invention, and all such modifications and improvements fall within the scope of the present invention. The scope of protection of the present invention is defined by the appended claims.

[0043] The contents not described in detail in this utility model specification are common knowledge to those skilled in the art.

Claims

1. A test model structure with adjustable position in a wind tunnel flow field, characterized in that, Includes the front section of the model (1), the rear section of the model (2), the transition cone sleeve (3), the balance insulation cone sleeve (4), and the balance (5); The front section (1) and the rear section (2) of the model are combined to form the outer shell of the test model; The adapter cone sleeve (3), the balance insulation cone sleeve (4), and the balance (5) are located inside the shell formed by the combination of the front section (1) and the rear section (2) of the model; The rear end of the adapter cone sleeve (3) is connected to the balance (5) through the balance insulation cone sleeve (4). The outer wall of the adapter cone sleeve (3) is connected to the inner wall of the rear section (2) of the model. The adapter cone sleeve (3) is provided with connecting pin holes at different positions along the axial direction. The rear section (2) of the model is provided with pin holes at fixed positions. One of the connecting pin holes on the adapter cone sleeve (3) is aligned with the fixed pin hole of the rear section (2) of the model. The adapter cone sleeve (3) and the rear section (2) of the model are positioned and fastened by connecting pins. The position of the connecting pins is used to adjust the axial position relative to the rear section (2) of the model. The balance (5) is fixedly connected to the adapter cone sleeve (3).

2. The experimental model structure with adjustable position in a wind tunnel flow field according to claim 1, characterized in that, The adapter cone sleeve (3) is an axisymmetrically rotated body.

3. The experimental model structure with adjustable position in a wind tunnel flow field according to claim 1, characterized in that, The outer diameter of the adapter cone sleeve (3) is d and the length is L. d and L satisfy the following relationship: L2≥2d2.

4. The experimental model structure with adjustable position in a wind tunnel flow field according to claim 1, characterized in that, The inner cavity of the adapter cone sleeve (3) is provided with a cone hole that mates with the balance heat insulation cone sleeve (4).

5. The experimental model structure with adjustable position in a wind tunnel flow field according to claim 4, characterized in that, The balance (5) and the adapter cone sleeve (3) are fixedly connected by screws (8). The front end of the balance (5) is provided with a first screw mounting hole, and the adapter cone sleeve (3) is provided with a second screw mounting hole. The second screw mounting hole is connected to the cone hole at the front end of the adapter cone sleeve (3) that mates with the balance heat insulation cone sleeve (4). The screw (8) passes through the second screw mounting hole and the cone hole in sequence from the front end of the adapter cone sleeve (3) and then engages with the first screw mounting hole to achieve a fixed connection between the balance (5) and the adapter cone sleeve (3).

6. The experimental model structure with adjustable position in a wind tunnel flow field according to claim 5, characterized in that, The coaxiality deviation between the tapered hole and the second screw mounting hole is less than 3′.

7. The experimental model structure with adjustable position in a wind tunnel flow field according to claim 5, characterized in that, A clamping washer (7) and a heat insulation washer (6) are arranged sequentially from front to back between the head of the screw (8) and the front end of the adapter cone sleeve (3).

8. The experimental model structure with adjustable position in a wind tunnel flow field according to claim 7, characterized in that, The adapter cone sleeve (3) is inserted from the front end of the rear section (2) of the model and is positioned and fastened to the rear section (2) of the model using a connecting pin; the balance insulation cone sleeve (4) and the balance (5) are inserted into the adapter cone sleeve (3) from the rear end of the rear section (2); the front section (1) of the model is fitted from the front end of the rear section (2) of the model and is positioned and fastened to the front section (1) using a connecting pin.

9. The experimental model structure with adjustable position in a wind tunnel flow field according to claim 1, characterized in that, The inner diameter of the front section (1) of the model and the outer diameter of the rear section (2) of the model are matched, and the coaxiality deviation during the fit is less than 3′.

10. The experimental model structure with adjustable position in a wind tunnel flow field according to claim 1, characterized in that, The outer diameter of the adapter cone sleeve (3) matches the inner diameter of the rear section (2) of the model, and the coaxiality deviation during the fit is less than 3′.

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