Side support wind tunnel test model structure

Abstract

The utility model discloses a side support wind tunnel test model which comprises a model middle section, a support block and a support ring. The model middle section is provided with an opening; the shape of the supporting block is matched with the opening, the supporting block is installed at the opening of the model middle section, a combination body formed after the supporting block and the model middle section are combined is of a cylinder structure provided with a supporting rod through hole, and the supporting rod through hole is perpendicular to the axis of the combination body; the supporting ring is installed outside a combined body formed by combining the supporting block and the model middle section and used for fixing the relative positions of the supporting block and the model middle section. According to the utility model, the overall strength of the model middle section is improved, the coaxiality after the model tail section and the model middle section are matched is improved, and the model has wide application prospects in the application aspect of wind tunnel tests.

Description

Technical Field

[0001] The utility model relates to a side support wind tunnel test model structure, which is used for the design of side support force measurement wind tunnel test models of projectiles and belongs to the technical field of wind tunnel tests. Background Art

[0002] For conventional tail support force measurement tests, it is necessary to modify the tail of the model. At the same time, there is interference from the tail strut to the model, and the aerodynamic characteristics of the true shape cannot be obtained. By designing a side support test scheme, the interference amount of the model tail modification and the tail strut on the aerodynamic characteristics of the model can be obtained, and the support interference can be corrected to obtain the aerodynamic characteristics of the true shape of the model. Therefore, the side support test has always been a research direction for obtaining higher-precision test data.

[0003] The design structure of a conventional side support test model is as Figure 1 shown. There is only one support ring at the opening of the middle section of the model, and the treatment is relatively simple. The strength of the middle section of the model is insufficient, and the large angle of attack and large load state cannot be realized. At the same time, the stiffness of the tail of the middle section of the model is insufficient, and it is easy to deform after multiple disassembly and assembly. The coaxiality between the tail section and the middle section of the model is poor after assembly. Summary of the Utility Model

[0004] The purpose of the utility model is to overcome the above defects and provide a side support wind tunnel test model, which solves the technical problems of small overall strength of the middle section of the existing side support model for projectiles, small stiffness at the opening of the middle section of the model, and poor coaxiality between the tail section and the middle section of the model. The utility model improves the overall strength of the middle section of the model, improves the coaxiality between the tail section and the middle section of the model after matching, and has a wide application prospect in the application of wind tunnel tests.

[0005] To achieve the above utility model purpose, the utility model provides the following technical solutions:

[0006] A side support wind tunnel test model structure includes: a middle section of the model, a support block, and a support ring;

[0007] The middle section of the model is provided with an opening;

[0008] The shape of the support block matches the opening, the support block is installed at the opening of the middle section of the model, and the combined body formed by the support block and the middle section of the model is a cylindrical structure provided with a strut through hole, and the strut through hole is perpendicular to the axis of the combined body;

[0009] The support ring is installed outside the combined body formed by the support block and the middle section of the model to fix the relative positions of the support block and the middle section of the model.

[0010] Further, the middle section of the model includes a front section connection section, a middle section body, and a tail section connection section connected in sequence;

[0011] The front connecting section is cylindrical and is used to connect with the front section of the model;

[0012] The tail connecting section is used to connect with the tail section of the model;

[0013] The opening provided in the middle section of the model includes the strut through-hole on the middle section body and the cylindrical opening part extending backward from the strut through-hole to the rear end of the tail connecting section.

[0014] Furthermore, the support block includes a cylindrical part and a cylindrical part protruding radially outward from the cylindrical part;

[0015] The cylindrical part of the support block is complementary in shape to the cylindrical opening part of the opening provided in the middle section of the model. The outer surface of the cylindrical part of the support block is used to fit and fixedly connect with the inner surface of the non-opening part of the middle section of the model, realizing the support for the middle section of the model.

[0016] Furthermore, the support block and the middle section of the model are fixedly connected by screws.

[0017] Furthermore, the support ring is a ring structure, and the installation position of the support ring is at the connection of the middle section body and the tail connecting section of the middle section of the model.

[0018] Furthermore, the support ring is fixed on the support block and the middle section of the model by screws.

[0019] Furthermore, the non-opening part of the tail connecting section of the middle section of the model is fitted with the tail section of the model through a cylindrical surface and fixed with screws.

[0020] Furthermore, when the non-opening part of the tail connecting section of the middle section of the model is fitted with the tail section of the model through a cylindrical surface, the length of the mating surface ≥ 42 mm.

[0021] Furthermore, the length of the complete circular surface part of the support block ≥ 5 mm; the complete circular surface part of the support block refers to Figure 3 dimension a in (a), and dimension a is the dimension along the axis of the support block. The larger this dimension is, the greater the strength of the support block.

[0022] Furthermore, the length of the support ring ≥ 8 mm, and the length of the support ring is the dimension along the axis of the support ring.

[0023] The utility model has at least one of the following beneficial effects compared with the prior art:

[0024] (1) The utility model designs the structure of the model support block, improving the overall strength of the middle section of the model, which can bear greater test loads;

[0025] (2) The utility model designs the support block and the connecting screw between the middle section of the model and the support block, improving the stiffness at the opening of the middle section of the model, and reducing the deformation amount at the opening of the middle section of the model after multiple disassembly and assembly of the model;

[0026] (3) The coaxiality after the cooperation between the tail section and the middle section of the model is improved in the present utility model;

[0027] (4) The structure of the present utility model has universality and is applicable to the design of the middle section of the side-supported model of projectiles and rockets. Description of the Drawings

[0028] Figure 1 is the structural diagram of the existing side-supported model;

[0029] Figure 2 is the structural diagram of the side-supported wind tunnel test model of the present utility model;

[0030] Figure 3 are the (a) perspective view and (b) cross-sectional view of the support block of the present utility model;

[0031] Figure 4 is the structural diagram of the support ring of the present utility model;

[0032] Figure 5 is the cross-sectional view of the side-supported wind tunnel test model of the present utility model, where the upper figure is the cross-sectional view along the vertical plane and the lower figure is the cross-sectional view along the horizontal plane;

[0033] Figure 6 is the overall assembly drawing of the side-supported structure and the test model of the present utility model;

[0034] In the figures, 1 - middle section of the model, 2 - support block, 3 - support ring, 4 - connecting nail between the middle section of the model and the support block, 5 - fixing nail of the support ring, 6 - fixing nail of the model tail section, 7 - middle section of the model of the existing side-supported model, 8 - support ring of the existing side-supported model, 9 - balance, 10 - taper sleeve, 11 - front section of the model, 12 - tail section of the model. Detailed Implementation Manner

[0035] The following is a detailed description of the present utility model, and the features and advantages of the present utility model will become clearer and more definite with these descriptions.

[0036] The special term "exemplary" here means "serving as an example, an embodiment or illustrative". Any embodiment described as "exemplary" here does not have to be interpreted as superior or better than other embodiments. Although various aspects of the embodiments are shown in the drawings, the drawings do not have to be drawn to scale unless otherwise specified.

[0037] The present utility model optimizes the structure at the opening of the side-supported test model to improve its deficiencies.

[0038] Such as Figures 2 to 5 , the present utility model provides a structural design of a side-supported wind tunnel test model. Such as Figure 2 , the opening of the middle section 1 of the side-supported model is processed, and the support block 2 is made according to the model shape. Such asFigure 3 Fix the support block 2 and the middle section 1 of the model together with the connecting nails 4 between the middle section of the model and the support block, as shown in Figure 4 and Figure 5 Position the support block 2 with a support ring 3, and fix the support ring 3 on the middle section 1 of the model and the support block 2 with the fixing nails 5 of the support ring. The middle section 1 of the model is fixed to the balance 9 through a tapered sleeve 10.

[0039] The structure of the side support wind tunnel test model mainly includes: the middle section 1 of the model, the support block 2, the support ring 3 and the fixing screws. The specific scheme is as follows:

[0040] As shown in Figure 6 , since the side support strut runs across the middle section of the model, it is necessary to open an opening in the middle section of the model for the strut to pass through. At the opening of the middle section of the model, make a support block according to the model shape, and fix the support block and the middle section of the model together with the connecting nails 4 between the middle section of the model and the support block. Both ends of the middle section 1 of the model are connected to the front section 11 of the model and the rear section 12 of the model respectively.

[0041] Machine the support ring, position the support block, and fix the support ring 3 on the middle section 1 of the model and the support block 2 with the fixing nails 5 of the support ring.

[0042] The rear section of the model is mated with the middle section of the model through a cylindrical surface and fixed with the fixing nails 6 of the rear section of the model.

[0043] The model installation is completed, and the full-scale missile force measurement wind tunnel test and data acquisition process are carried out normally.

[0044] In the present utility model, to minimize the damage to the model shape, a support block is made according to the model shape and is mated with the middle section of the model. The support ring is fixed on the middle section of the model and the support block with the fixing nails 5 of the support ring to ensure no relative deformation between the middle section of the model and the support block, and the radial and axial positioning accuracy of the support block. At the same time, due to the presence of the support ring, the overall strength of the middle section of the model is improved, and it is applicable to test models with larger blowing loads.

[0045] In the present utility model, the middle section of the model and the support block are connected together by the connecting nails 4 between the middle section of the model and the support block, increasing the stiffness of the middle section of the model and reducing the deformation amount of the middle section of the model during the test. At the same time, the coaxiality between the rear section of the model and the middle section of the model after assembly can be ensured.

[0046] In summary, the present utility model discloses a side support wind tunnel test model. The structure mainly includes the middle section of the model, the support ring, the support block, etc. The support ring is fixed on the middle section of the model and the support block with the fixing nails of the support ring. The middle section of the model and the support block are fixed together with the connecting nails between the model and the support block. The front section and the rear section of the model are connected to the middle section through cylindrical surface mating.

[0047] The utility model optimizes the structure of the opening at the middle section of the side support test model, increases the strength of the opening at the middle section of the model, and improves the test load that the model can withstand. The stiffness of the side support test model is increased, and the deformation of the opening at the middle section of the model after multiple disassembly and assembly is reduced. Moreover, the coaxiality after the assembly of the tail section and the middle section of the model is improved. At the same time, this structure is applicable to all configurations of missile and rocket aircraft.

[0048] Embodiment:

[0049] Since the middle section of the model needs to pass through the support rod for installation, an opening is processed at the rear of the middle section 1 of the model, and a support block 2 is made according to the shape of the model. The length of the complete circular surface part of the support block is not less than 5 mm, and it is installed in cooperation with the middle section 1 of the model. The middle section of the model is fixed with the connecting nail 4 of the support block to prevent the deformation of the tail of the middle section of the model after multiple disassembly and assembly. The diameter of the connecting nail 4 between the middle section of the model and the support block is not less than 3 mm.

[0050] The middle section 1 of the model and the support block 2 of the model are connected together by a support ring 3. The length of the support ring is not less than 8 mm. To ensure the positioning accuracy of the support block and prevent the loosening of the front part of the middle section of the model, the support ring 3 is fixed on the middle section of the model and the support block with a support ring fixing nail 5. The diameter of the support ring fixing nail 5 is not less than 3 mm. The tail section of the model is connected to the middle section of the model through cylindrical surface fitting. The length of the fitting surface is not less than 42 mm, and it is fixed with a tail section fixing nail 6 of the model. The diameter of the tail section fixing nail 6 of the model is not less than 3 mm.

[0051] The present utility model has been described in detail above in combination with specific embodiments and exemplary examples, but these descriptions should not be construed as limiting the present utility model. Those skilled in the art understand that without departing from the spirit and scope of the present utility model, various equivalent substitutions, modifications or improvements can be made to the technical solutions and implementation manners of the present utility model, and all of these fall within the scope of the present utility model. The protection scope of the present utility model shall be subject to the appended claims.

[0052] The content not described in detail in the specification of the present utility model belongs to the well-known technology of those skilled in the art.

Claims

1. A side-support wind tunnel test model structure, characterized in that Comprising: The middle section (1) of the model, the support block (2) and the support ring (3); The middle section (1) of the model is provided with an opening; The shape of the support block (2) matches the opening. The support block (2) is installed at the opening of the middle section (1) of the model. The combined body formed by the combination of the support block (2) and the middle section (1) of the model is a cylindrical structure provided with a strut through-hole, and the strut through-hole is perpendicular to the axis of the combined body; The support ring (3) is installed outside the combined body formed by the combination of the support block (2) and the middle section (1) of the model, and is used to fix the relative positions of the support block (2) and the middle section (1) of the model.

2. The side support wind tunnel test model structure according to claim 1, characterized in that, The middle section (1) of the model includes a front-section connecting section, a middle-section body and a tail-section connecting section that are connected in sequence; The front-section connecting section is cylindrical and is used to connect with the front section of the model; The tail-section connecting section is used to connect with the tail section of the model; The opening provided in the middle section (1) of the model includes a strut through-hole on the middle-section body and a cylindrical opening part that extends backward from the strut through-hole to the rear end of the tail-section connecting section.

3. The side support wind tunnel test model structure according to claim 2, wherein, The support block (2) includes a cylindrical part and a cylindrical part that protrudes radially outward from the cylindrical part; The cylindrical part of the support block (2) is complementary in shape to the cylindrical opening part of the opening provided in the middle section (1) of the model. The outer surface of the cylindrical part of the support block (2) is used to fit and fixedly connect with the inner surface of the non-opening part of the middle section (1) of the model to realize the support of the middle section (1) of the model.

4. The side support wind tunnel test model structure according to claim 3, characterized in that The support block (2) and the middle section (1) of the model are fixedly connected by screws.

5. The side support wind tunnel test model structure according to claim 3, characterized in that The support ring (3) is a ring structure, and the installation position of the support ring (3) is at the connection between the middle-section body and the tail-section connecting section of the middle section (1) of the model.

6. The structure of a side-support wind tunnel test model according to claim 3, wherein, The support ring (3) is fixed on the support block (2) and the middle section (1) of the model by screws.

7. A side support wind tunnel test model structure according to claim 3, characterized in that, The non-opening part of the tail-section connecting section of the middle section (1) of the model is fitted with the tail section of the model through a cylindrical surface and fixed with screws.

8. A side support wind tunnel test model structure according to claim 7, characterized in that, When the non-opening part of the tail-section connecting section of the middle section (1) of the model is fitted with the tail section of the model through a cylindrical surface, the length of the mating surface is not less than 42 mm.

9. The side support wind tunnel test model structure according to claim 1, wherein The length of the complete circular surface part of the support block (2) is not less than 5 mm.

10. A side support wind tunnel test model structure according to claim 1, characterized in that, The length of the support ring (3) is not less than 8 mm.

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