Solid charge for realizing high-thrust constant-surface combustion and manufacturing process of solid charge

Abstract

The invention discloses a solid charge for realizing high-thrust constant-surface combustion and a manufacturing process thereof, and belongs to the field of solid rocket engines, the solid charge comprises a grain, coating layers are arranged at the axial rear end and the rear end face of the grain, at least one groove distributed in the axial direction is formed in each coating layer, and the grain is arranged in the groove. The axial front end of the groove is communicated with the axial front end of the grain, the surface, without the coating layer, of the grain is a burning surface, different thrust requirements can be met by changing the area of the coating layer and the area of the groove, so that the constant pushing rule of the burning surface is achieved, and the missile keeps working with constant large thrust. And the large explosive loading amount is achieved, the missile range is increased, and the technical problem that constant large thrust cannot be achieved while the explosive loading amount is guaranteed in the prior art is solved.

Description

Technical Field

[0001] The invention belongs to the field of solid rocket engines and relates to a charge structure, in particular to a solid charge for achieving high-thrust constant-surface combustion and a manufacturing process thereof. Background Art For small tactical missiles, in order to improve their strike accuracy, it is necessary to design a higher missile working speed, and the corresponding engine needs to provide a constant high thrust; in order to make the missile range longer, it is necessary to increase the engine charge as much as possible and design a longer working time. In the field of solid rocket engines, the charge type design directly determines the working parameters of the missile, and the amount of charge represents the flight range of the missile; the size of the combustion surface determines the thrust of the missile; the change of the combustion surface reflects the flight trajectory of the missile, so the charge type design is the core part of the solid rocket engine design. The solid charge structure bonded to the shell can provide the largest charge, but due to structural limitations, this charge type can only achieve a constant low thrust; the star hole charge structure bonded to the shell can provide a large constant thrust, but in the large aspect ratio engine, in order to avoid erosion combustion, it is necessary to reserve enough gas channels, and the corresponding charge will have a large loss; in order to achieve the working requirements of constant high thrust and take into account the design goal of large charge, it is necessary to design and develop a new charge structure. Summary of the invention

[0002] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a solid charge and a manufacturing process for achieving high thrust constant surface combustion, so as to solve the technical problem in the prior art that it is impossible to achieve constant high thrust while ensuring the charge amount.

[0003] In order to solve the above technical problems, the present invention adopts the following technical solutions to achieve the above problems: A solid charge for achieving high-thrust constant-surface combustion comprises a grain column, wherein the axial rear end and rear end surface of the grain column are provided with a coating layer, the coating layer is provided with at least one axially distributed groove, and the axial front end of the groove is connected to the axial front end of the grain column.

[0004] The present invention also includes the following technical features: The coating layer is made of EPDM rubber.

[0005] The groove is a rectangular groove.

[0006] The area on the drug column where no coating layer is provided Satisfies the following formula:

[0007] in: Indicates the area of ​​the front end of the medicine column, mm 2 ; Indicates the area of ​​the cylindrical surface without coating layer on the front end of the grain, mm 2 ; Indicates the area of ​​the slot, mm 2 ; Indicates the diameter of the drug column, mm; Indicates the length of the drug column, mm; It indicates the length of the cylindrical surface without coating layer on the front end of the grain, mm; Indicates the length of the slot, mm; Indicates the width of the slot, mm; Indicates the number of slots.

[0008] The length of the cylindrical surface on the front end of the drug column without the coating layer Length of the drug column The ratio ranges from 1 / 4 to 1 / 2, and the number of slots n is 2.

[0009] A manufacturing process of a solid charge for realizing high-thrust constant-area combustion, based on the solid charge for realizing high-thrust constant-area combustion, comprises the following steps: Step 1: pouring the propellant slurry into the prefabricated coating layer; Step 2: After the propellant slurry is solidified and formed, the grain column and the coating layer are structurally shaped according to the design requirements; The structural shaping is to remove the coating layer located at the axial front end of the medicine column and to open at least one groove at the axial rear end of the medicine column.

[0010] Compared with the prior art, the present invention has the following beneficial technical effects: In the present invention, the surface of the charge without a coating layer is the combustion surface. By changing the area of ​​the coating layer and the area of ​​the groove, different thrust requirements can be met to achieve a constant displacement law of the combustion surface, so that the missile maintains a constant high thrust operation. In addition, the solid charge structure has a large charge amount, which increases the missile range and solves the technical problem in the prior art that it is impossible to achieve a constant high thrust while ensuring the charge amount. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 It is a cross-sectional schematic diagram of the present invention.

[0012] The meanings of the various numbers in the figure are: drug column 1, coating layer 2, groove 3.

[0013] The specific contents of the present invention are further explained in detail below in conjunction with embodiments. DETAILED DESCRIPTION

[0014] It should be noted that, unless otherwise specified, all components in the present invention are components known in the art.

[0015] Specific embodiments of the present invention are given below. It should be noted that the present invention is not limited to the following specific embodiments, and all equivalent changes made on the basis of the technical solution of this application fall within the protection scope of the present invention.

[0016] The present invention provides a solid charge for achieving high-thrust constant-surface combustion, comprising a charge 1, the axial rear end and rear end surface of the charge 1 being provided with a coating layer 2, the coating layer 2 being provided with at least one axially distributed groove 3, the axial front end of the groove 3 being connected to the axial front end of the charge 1.

[0017] In the above technical solution, the grooves 3 are provided to increase the initial burning surface and increase the surface of the burning surface during its movement. There is no coating layer 2 on the outside of the front half of the charge 1. During the movement of the burning surface, the area of ​​the burning surface gradually decreases. The grooves 3 provided in the rear half of the charge 1 gradually increase the area of ​​the burning surface during its movement. By adjusting the design parameters such as the axial length of the coating layer 2 and the width, length and number of the grooves 3, the entire charge burning surface can be made to have a constant surface during its movement.

[0018] Specifically, the coating layer 2 is made of EPDM rubber.

[0019] Specifically, the groove 3 is a rectangular groove.

[0020] In the above technical solution, the groove 3 is set to be rectangular, which is conducive to determining the size of the combustion surface, so that the thrust can be determined more accurately.

[0021] Area of ​​the drug column 1 without the coating layer 2 Satisfies the following formula:

[0022] in: Indicates the area of ​​the front end of the drug column 1, mm 2 ; Indicates the area of ​​the cylindrical surface on the front end of the drug column 1 without the coating layer 2, mm 2 ; Indicates the area of ​​slot 3, mm 2 ; Indicates the diameter of the drug column 1, mm; Indicates the length of the drug column 1, mm; Indicates the length of the cylindrical surface on the front end of the drug column 1 without the coating layer 2, mm; Indicates the length of slot 3, mm; Indicates the width of slot 3, mm; Indicates the number of slot 3.

[0023] The length of the cylindrical surface of the front end of the drug column 1 without the coating layer 2 Length of drug column 1 The ratio range is 1 / 4~1 / 2, and the number n of slots 3 is 2.

[0024] A manufacturing process of a solid charge for realizing high thrust constant surface combustion is also provided. Based on the solid charge for realizing high thrust constant surface combustion, the manufacturing process comprises the following steps: Step 1: pouring the propellant slurry into the prefabricated coating layer 2; Step 2: After the propellant slurry is solidified and formed, the grain column 1 and the coating layer 2 are structurally shaped according to the design requirements; The structural shaping is to remove the coating layer 2 located at the axial front end of the medicine column 1 and to open at least one groove 3 at the axial rear end of the medicine column 1 .

[0025] Example 1: Under the constant thrust T requirement, the charge amount of the present invention is 573g, the charge thickness is 14.8mm, and the engine working time is 2.11s.

[0026] Comparative Example 1: Under the constant thrust T requirement, the charge weight of the star hole charge is 516g, the charge thickness is 10.2mm, and the engine working time is 1.46s.

[0027] The star-hole charge type is a common type of charge with a large aspect ratio to achieve high thrust and constant surface. It opens up the center of the solid charge column according to a certain star-hole structure to achieve the effect of increasing the burning surface. Compared with the star-hole charge type, the present invention is based on the solid charge column, by bonding a coating layer on the outer surface of the charge, so that a part of the charge surface is exposed, forming an initial burning surface, and achieving constant high thrust output.

[0028] By comparing Example 1 with Comparative Example 1, it is found that in the same space, both medicine types can provide constant large thrust, but compared with the star-hole medicine type structure, the star-hole medicine type structure has a charge of 90% of the present invention and provides 69% of the engine working time of the present invention. The present invention has a higher filling coefficient, a larger charge, and can provide a longer working time for the engine. Example 2: In the same space, with the same charge M, this charge can provide a thrust of 608N; Comparative Example 2: In the same space, with the same charge M, the end-burning charge can provide a thrust of 20N; The end-burning type of charge is a type of charge in which the outer surface of the charge and the front end face are covered, leaving only the rear end face as the burning surface. The end-burning type of charge has a high filling coefficient and can achieve long-term constant thrust output, but its disadvantage is that due to the limitation of the charge caliber, the area of ​​the charge end face is limited, resulting in a smaller thrust of the charge.

[0029] By comparing Example 2 and Comparative Example 2, it is found that the thrust provided by the present invention is 30 times that of the end-ignition type.

[0030] Embodiment 3: This embodiment provides a manufacturing process for a solid charge for achieving high thrust constant surface combustion, which specifically includes the following steps: Step 1: pouring the propellant slurry into the prefabricated coating layer 2; Step 2: After the propellant slurry is solidified and formed, the grain column 1 and the coating layer 2 are structurally shaped according to the design requirements; The design requirements are: the average engine thrust is 790N.

[0031] The structural shaping is specifically as follows: the total length of the coating layer 2 is 480 mm, the coating layer 2 with a length of 156 mm on the axial front end side wall of the drug column 1 is removed, and then two grooves 3 with a width of 8 mm and a length of 324 mm are opened on the axial rear end side wall of the drug column 1.

[0032] Therefore, the initial burning surface of the charge in this embodiment is 20378mm 2 , where the front face area is 688 mm 2 The uncoated length of the front end of the charge 1 is 156 mm, the radius of the charge 1 is 14.8 mm, and the corresponding initial burning surface is 14506 mm 2 ; Two grooves of equal width are set at the rear end of the charge column 1. The width of the groove is 8mm and the length is 324mm. The corresponding initial burning surface is 5184 mm 2 , the front and rear combustion surface ratio is 2.93:1; During the process of the burning surface moving, the burning surface at the front end of the charge 1 gradually decreases, and the burning surface at the rear end of the charge 1 gradually increases. When the charge thickness is half burned, the burning surface of the charge 1 is 22356 mm 2 (9.7% increase on the initial burning surface). At this time, the burning surface at the front end of the charge is 7644 mm 2 The burning surface formed by the slot at the rear end of the charge is 14712 mm 2 , the front and rear combustion surface ratio is 1:1.92; When the charge is about to burn out, the burning surface is 19566 mm 2 (4.0% reduction on the basis of the initial burning surface). At this time, the burning surface at the front end of the charge is 690 mm 2 The burning surface formed by the slot at the rear end of the charge is 18876 mm 2 The front and rear end combustion surface ratio is 1:27.36.

[0033] During the above combustion process, the burning surface of the charge was constant and the average thrust of the engine reached 790N.

[0034] It should be noted that the initial burning surface of the charge is the preset burning surface area before the charge 1 burns, including the area of ​​the front end surface of the charge 1, the uncovered area of ​​the front end of the charge 1 and the area of ​​the groove 3 on the axial rear end of the charge 1.

Claims

1. A solid charge for achieving high thrust constant surface combustion, comprising a charge column (1), characterized in that: The axial rear end and rear end surface of the drug column (1) are provided with a coating layer (2), the coating layer (2) is provided with at least one groove (3) distributed along the axial direction, and the axial front end of the groove (3) is connected to the axial front end of the drug column (1).

2. The solid charge for achieving high thrust constant surface combustion as claimed in claim 1, characterized in that: The coating layer (2) is made of EPDM rubber.

3. The solid charge for achieving high thrust constant surface combustion as claimed in claim 1, characterized in that: The groove (3) is a rectangular groove.

4. The solid charge for achieving high thrust constant surface combustion as claimed in claim 1, characterized in that: The area of ​​the drug column (1) not provided with the coating layer (2) Satisfies the following formula: in: Indicates the area of ​​the front end of the charge column (1), mm 2 ; Indicates the area of ​​the cylindrical surface on the front end of the charge (1) without the coating layer (2), mm 2 ; Indicates the area of ​​the slot (3), mm 2 ; Indicates the diameter of the drug column (1), mm; Indicates the length of the drug column (1), mm; represents the length of the cylindrical surface on the front end of the drug column (1) where the coating layer (2) is not provided, in mm; represents the length of the slot (3), mm; represents the width of the slot (3), mm; Indicates the number of slots (3).

5. The solid charge for achieving high thrust constant surface combustion as claimed in claim 4, characterized in that: The length of the cylindrical surface of the front end of the drug column (1) where the coating layer (2) is not provided Length of the charge column (1) The ratio ranges from 1 / 4 to 1 / 2, and the number n of slots (3) is 2.

6. A manufacturing process for solid charge for achieving high thrust constant surface combustion, characterized in that: The solid charge for achieving high thrust constant surface combustion according to any one of claims 1 to 4 comprises the following steps: Step 1: pouring the propellant slurry into the prefabricated coating layer (2); Step 2: After the propellant slurry is solidified and formed, the grain column (1) and the coating layer (2) are structurally shaped according to design requirements; The structural shaping is to remove the coating layer (2) located at the axial front end of the drug column (1), and to open at least one groove (3) at the axial rear end of the drug column (1).

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