Pneumatic resistance reducing and pressurizing structure suitable for super-large concrete load rocket sled

Abstract

The invention relates to a pneumatic drag reduction and pressurization structure suitable for a super-large concrete load rocket sled. The pneumatic drag reduction and pressurization structure solves the problem that a super-large concrete load rocket sled test cannot be carried out through an existing rocket sled pneumatic shape in an existing rocket sled test technology. The front flow guide face is of an inclined face structure, and the included angle between the front flow guide face and the horizontal line of the skid car symmetry plane is 15-45 degrees. The inner side lower flow guide face is of an inclined face structure, and the included angle between the inner side lower flow guide face and the horizontal line of the skid car symmetry plane is 15-45 degrees. The inner side upper flow guide face is of an inclined face structure, and the included angle between the inner side upper flow guide face and the vertical line of the skid car symmetry plane is 20-90 degrees. The upper flow guide face is of a straight face type structure, and the included angle between the upper flow guide face and the vertical line of the skid car symmetry plane is 90 degrees. The outer side flow guide face is of an inclined face structure, and the included angle between the outer side flow guide face and the vertical line of the skid car symmetry face ranges from 10 degrees to 70 degrees. The bottom plate is of a regular flat plate structure, the included angle between the plane with the largest area and the vertical line of the symmetry plane of the sledge car is 90 degrees, and the thickness of the bottom plate is 180-300 mm. The pneumatic anti-drag pressurizing structure has the advantages of being good in pneumatic characteristic, easy to machine and the like.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of military target range test and test technology, and mainly relates to rocket sled test technology, and in particular relates to a kind of aerodynamic drag reduction and pressure increasing structure suitable for super large concrete load rocket sled, which is used for super large concrete load rocket sled ground simulation test. BACKGROUND

[0002] With the strengthening of modern war confrontation and the rapid development of weapon equipment, "deep burying" and "reinforcement" have become an important development trend of high-value targets on the battlefield, and important places such as underground command post, ammunition storage and strategic communication node generally adopt super large concrete load structure to ensure that their anti-explosion and anti-impact capabilities far exceed the level of civil conventional engineering. At present, the research on super large concrete load has become a topic that cannot be avoided in the development of attack and defense of various countries. The defense effect of high-value important targets and the good penetration and damage effect of advanced warheads on the structure need the strong support of test and test technology. The super large concrete load rocket sled test relies on a special ground slide rail, accelerates through a multi-stage power system, accelerates the test product along the high-precision slide rail to super high speed, and carries out related performance evaluation and examination of aerodynamic characteristics, structural response and collision damage.

[0003] In the field of rocket sled test technology, the United States completed a rocket sled recovery test at a speed of 5.8 Mach at the Holoman High-Speed Test Track in 2022, bringing rocket sled ground dynamic test into a new stage of development. At present, the rocket sled usually adopts the structure form of truss and is applied to the test background of subsonic, transonic and supersonic speed. However, for super large concrete load, due to the large overall mass and volume of the load, the rocket sled system cannot be pushed to the specified speed according to the existing power configuration conditions, and the problem of aerodynamic characteristics needs to be solved to ensure the safety of the whole system and the effectiveness of the test. Therefore, it is urgent to design a kind of aerodynamic drag reduction and pressure increasing structure suitable for super large concrete load rocket sled. SUMMARY

[0004] The present application is to solve the problem that the existing rocket sled aerodynamic shape in the existing rocket sled test technology cannot carry out super large concrete load rocket sled test, and proposes a kind of aerodynamic drag reduction and pressure increasing structure suitable for super large concrete load rocket sled.

[0005] The present application is realized by the following technical solutions:

[0006] A kind of aerodynamic drag reduction and pressure increasing structure suitable for super large concrete load rocket sled, comprising a positive flow guide surface 1, an inner lower flow guide surface 2, an inner upper flow guide surface 3, an upper side flow guide surface 4, an outer side flow guide surface 5 and a bottom plate 6.

[0007] The present application is characterized in that the positive flow guide surface is a slope structure, and the included angle between the horizontal line of the symmetry plane of the sled and the positive flow guide surface is 15-45 degrees, the inclination of the structure is determined by the geometric characteristics of the windward surface of the super-large concrete load, and the structure has the largest drag reduction effect and provides the main negative lift effect.

[0008] The present application is characterized in that the inner lower flow guide surface is a slope structure, and the included angle between the horizontal line of the symmetry plane of the sled and the inner lower flow guide surface is 15-45 degrees, the inclination of the structure is determined by the horizontal geometric characteristics of the windward surface of the super-large concrete load and the angle and size of the positive flow guide surface, and the structure has the effect of providing auxiliary drag reduction.

[0009] The present application is characterized in that the inner lower flow guide surface is a slope structure, and the included angle between the horizontal line of the symmetry plane of the sled and the positive flow guide surface is 15-45 degrees, the inclination of the structure is determined by the geometric characteristics of the windward surface of the super-large concrete load, and the structure has the largest drag reduction effect and provides the main negative lift effect.

[0010] The present application is characterized in that the upper side flow guide surface is a straight surface structure, and the included angle between the vertical line of the symmetry plane of the sled and the upper side flow guide surface is 20-90 degrees, the angle of the structure is jointly affected by the geometric characteristics of the positive flow guide surface and the inner lower flow guide surface, and the structure has the effect of improving the airflow pressure environment of the bottom plate and the effect of improving the overall structure negative lift.

[0011] The present application is characterized in that the outer side flow guide surface is a slope structure, and the included angle between the vertical line of the symmetry plane of the sled and the outer side flow guide surface is 10-70 degrees, the angle and geometric shape of the structure are jointly affected by the geometric size of the positive flow guide surface and the bottom plate, and the structure has the effect of lateral flow guiding and adjusting the structure negative lift.

[0012] The present application is characterized in that the bottom plate is a regular flat plate structure, the included angle between the maximum area plane and the vertical line of the symmetry plane of the sled is 90 degrees, and the thickness is 180-300 mm, which has the effect of enhancing the overall structure strength and rigidity.

[0013] The present application is characterized in that the positive flow guide surface, the inner lower flow guide surface, the inner upper flow guide surface, the upper side flow guide surface and the outer side flow guide surface have the effect of flow guiding, which can improve the aerodynamic force and adjust the drag and negative pressure, in addition, the geometric parameters of each surface can be changed according to the boundary of the super-large concrete load, so that the aerodynamic force of the sled reaches a local optimal solution, and the stable operation of the sled is ensured.

[0014] Compared with the prior art, the present application has the following advantages:

[0015] (1) The present application first proposes a simple and easy aerodynamic drag reduction and pressure increasing structure with good aerodynamic characteristics, which can greatly reduce the aerodynamic drag of the super-large concrete load rocket sled, and ensure that the aerodynamic negative lift can meet the operation requirements of the sled.

[0016] (2) The various surface geometry parameters of the present application can be changed with the change of the super-large concrete load boundary, and the aerodynamic layout design of high efficiency is completed to achieve the local optimal solution of aerodynamic force, and the design requirements are met.

[0017] (3) The aerodynamic drag reduction and pressure increase structure of the present application realizes the matching design with the super-large concrete load, greatly optimizes the aerodynamic force of the sled, and can realize a relatively simple and rapid processing flow, and can most economically realize the ground test of the super-large concrete load. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a schematic diagram of the aerodynamic drag reduction and pressure increase structure shape;

[0019] Figure 2 is a front view of the aerodynamic drag reduction and pressure increase structure shape;

[0020] Figure 3 is a front guide surface;

[0021] Figure 4 is an inner lower guide surface;

[0022] Figure 5 is an inner upper guide surface;

[0023] Figure 6 is an upper guide surface;

[0024] Figure 7 is an outer guide surface;

[0025] Wherein: 1-front guide surface; 2-inner lower guide surface; 3-inner upper guide surface; 4-upper guide surface; 5-outer guide surface; 6-bottom plate. DETAILED DESCRIPTION

[0026] The present application will be described in detail below in combination with the drawings:

[0027] Embodiment:

[0028] The maximum speed requirement of a certain type of super-large concrete load rocket sled test is 1.1Ma, and the mass and size of the super-large concrete load product are large, so the conventional general sled type aerodynamic structure cannot be used. According to the actual test requirements, the aerodynamic shape of the super-large concrete load rocket sled is designed, and the aerodynamic drag reduction and pressure increase structure shape of the present application is applied to the aerodynamic shape design.

[0029] As Figures 1-7As shown, the rectifier shape of the application includes a positive guide surface 1, an inner lower guide surface 2, an inner upper guide surface 3, an upper side guide surface 4, an outer side guide surface 5 and a bottom plate 6, which realizes the advantages of good aerodynamic characteristics, high stability, simple processing and manufacturing of the super-large concrete load rocket sled. The geometric dimensions (L1, L2, L3, L4, L5) of the positive guide surface are 615mm, 336mm, 475mm, 929mm and 306mm in sequence, and the included angle (α) with the horizontal line of the sled symmetry plane is 25°; the geometric dimensions (L6, L7, L8, L9) of the inner lower guide surface are 615mm, 476mm, 148mm and 998mm in sequence, and the included angle (β) with the horizontal line of the sled symmetry plane is 13.1°; the geometric dimensions (L10, L11, L12, L13) of the inner upper guide surface are 336mm, 212mm, 337mm and 476mm in sequence, and the included angle (γ) with the vertical line of the sled symmetry plane is 44°; the geometric dimensions (L14, L15, L16, L17) of the upper side guide surface are 212mm, 475mm, 212mm and 475mm in sequence; the geometric dimensions (L18, L19, L20, L21) of the outer side guide surface are 929mm, 212mm, 427mm and 972mm in sequence, and the included angle (δ) with the vertical line of the sled symmetry plane is 18.7°.

[0030] The aerodynamic drag reduction and pressure increase structure shape of the example and the aerodynamic force simulation data of the rocket sled full system applied in the example are shown in Table 1 and Table 2 respectively.

[0031] Table 1 Aerodynamic force table of the aerodynamic drag reduction and pressure increase structure of the example at a speed of 1.1Ma (unit: N)

[0032]

[0033] Table 2 Aerodynamic force table of the rocket sled full system (unit: N)

[0034]

[0035] From the simulation results, the application applied to the super-large concrete load rocket sled meets the requirements of small full-system aerodynamic drag, aerodynamic lift as full trajectory pressure state, and reasonable and reliable design. The aerodynamic drag reduction and pressure increase structure shape of the application has the advantages of good aerodynamic characteristics and simple processing.

Claims

1. A structure for aerodynamic drag reduction and pressure augmentation for a super heavy concrete loaded rocket sled, characterized by: The positive flow guide surface, the inner lower flow guide surface, the inner upper flow guide surface, the upper flow guide surface, the outer flow guide surface and the bottom plate are included. The positive flow guide surface is a slope structure, the slope degree of which is determined by the geometric characteristics of the windward surface of the super large concrete load, and has the largest drag reduction effect and provides the main negative lift effect. The inner lower flow guide surface is a slope structure, the slope degree of which is determined by the horizontal geometric characteristics of the windward surface of the super large concrete load and the angle and size of the positive flow guide surface, and has the auxiliary drag reduction effect. The inner upper flow guide surface is a slope structure, the angle of which is jointly influenced by the geometric characteristics of the positive flow guide surface and the inner lower flow guide surface, and has the effect of improving the air flow pressure environment of the bottom plate and the effect of improving the overall structure negative lift. The upper flow guide surface is a straight surface structure, the geometric shape of which is jointly determined by the geometric characteristics of the positive flow guide surface, the inner upper flow guide surface, the outer flow guide surface and the windward surface of the super large concrete load, and has the effect of transition and providing negative lift. The outer flow guide surface is a slope structure, the angle and geometric shape of which are jointly influenced by the geometric size of the positive flow guide surface and the bottom plate, and has the effect of lateral flow and adjusting the structure negative lift. The bottom plate is a regular flat structure, and has the effect of enhancing the overall structure strength and rigidity.

2. The aerodynamic drag-reducing pressurizing structure for a rocket sled with an ultra-large concrete load according to claim 1, characterized in that: The angle between the positive flow guide surface and the horizontal line of the symmetry plane of the sled is 15°-45°.

3. The aerodynamic drag-reducing pressurizing structure for a rocket sled with an ultra-large concrete load according to claim 1, characterized in that: The angle between the inner lower flow guide surface and the horizontal line of the symmetry plane of the sled is 15°-45°.

4. The aerodynamic drag-reducing pressurizing structure for a rocket sled with an ultra-large concrete load according to claim 1, characterized in that: The angle between the inner upper flow guide surface and the vertical line of the symmetry plane of the sled is 20°-90°.

5. The aerodynamic drag-reducing pressurizing structure for a rocket sled with an ultra-large concrete load according to claim 1, characterized in that: The angle between the upper flow guide surface and the vertical line of the symmetry plane of the sled is 90°.

6. The aerodynamic drag-reducing pressurizing structure for a rocket sled with an ultra-large concrete load according to claim 1, characterized in that: The angle between the outer flow guide surface and the vertical line of the symmetry plane of the sled is 10°-70°.

7. The aerodynamic drag-reducing pressurizing structure for a rocket sled with an ultra-large concrete load according to claim 1, characterized in that: The angle between the plane with the maximum area of the bottom plate and the vertical line of the symmetry plane of the sled is 90°, and the thickness is 180mm-300mm.

8. The aerodynamic drag-reducing pressurizing structure for a rocket sled with an ultra-large concrete load according to claim 1, characterized in that: The geometric parameters of each surface can be changed according to the boundary of the super large concrete load, so that the aerodynamic force of the sled reaches a local optimal solution, and the stable operation of the sled is ensured.

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