Uniform-section charge type with whole-section area reduction property

Abstract

The utility model provides a uniform-section explosive type with a whole-section area reduction property. The uniform-section explosive type comprises an explosive column, the star-angle groove is formed in the middle of the grain, and a plurality of internal reduction combustion surfaces are arranged on the periphery of the star-angle groove. According to the utility model, the whole-section reduced-area combustion characteristic can be realized without opening the groove to the outer surface of the grain; the combined inner ballistic curve is more stable, the thermal protection difficulty is lower than that of an original explosive type (a groove-column-shaped explosive column with a groove formed to the outer surface of the explosive column), and the requirements of a main engine for the inner ballistic curve and thermal protection are better met.

Description

Technical Field

[0001] The utility model relates to a uniform cross-section medicine form with the property of full-section surface reduction. Background Art

[0002] Grain is an important component of solid rocket engine, which determines the main ballistic performance of the engine. Grain shape design is one of the important contents of overall engine design. There are many types of grains, and designers can reasonably select the shape of grains according to the overall design requirements. Grains can be divided into equal (constant) surface, reduced surface, and increased surface combustion types according to the change law of the combustion surface. According to the location of the combustion surface, they are divided into end surface, side surface, and end and side surface combustion types. According to the dimension of the main combustion direction, they are divided into one-dimensional, two-dimensional, and three-dimensional grains. According to the geometric shape, they are divided into: tubular, star-shaped, wheel-shaped, grooved cylindrical, spherical, conical cylindrical, and wing cylindrical grains.

[0003] Nowadays, for some mass-produced solid rocket engines that use pure two-dimensional combustion surface combination charges. A charge structure of a double-grained charge with a reduced surface and increased surface is often used. Common forms include a three-groove cylindrical charge with a circular hole charge. For two-dimensional combustion charges with absolute end faces, it is generally avoided to open the grooves to the outer surface of the charge (joining the thermal insulation layer). This will bring considerable pressure to the thermal protection of the combustion chamber, increase the weight of the thermal insulation material, and reduce the overall performance of the engine. If the grooves are not opened to the outer surface, the charge will show an increased surface combustion property during the initial combustion process (before the grooves of the groove column are burned to the outer surface). The engine as a whole shows an increased surface combustion characteristic, which does not meet the general requirements of the main engine for the internal ballistic curve. Utility Model Content

[0004] The utility model provides a uniform cross-section charge with full-section surface reduction properties in order to solve the technical problem of how to have full-section surface reduction combustion characteristics without opening grooves to the outer surface of the charge.

[0005] The utility model solves the above technical problems through the following technical solutions:

[0006] The utility model provides a uniform cross-section medicine type with the property of full-section surface reduction, including a medicine column; and also includes: a star-angle groove, which is arranged in the middle of the medicine column, and a plurality of inner surface reduction combustion surfaces are arranged around the star-angle groove.

[0007] Preferably, a plurality of the inner reducing surface combustion surfaces are distributed in a ring array around the star-angle groove.

[0008] Preferably, a reference circular hole is provided in the middle of the star-angle groove.

[0009] Preferably, the reference circular hole is located at the axis of the drug column.

[0010] Preferably, the inner reducing combustion surface is composed of two strip grooves.

[0011] Preferably, a V-shaped structure is formed between the two strip grooves on the combustion surface of the inner reduction surface.

[0012] Preferably, the angle between the two strip grooves on the inner reducing surface combustion surface is 28-32°.

[0013] Preferably, one end of the inner reducing surface combustion surface close to the reference circular hole is connected to the reference circular hole.

[0014] Preferably, a chamfer is provided between one end of the inner reducing surface combustion surface close to the reference circular hole and the reference circular hole.

[0015] Preferably, an outer arc surface is provided at one end of the inner reducing surface combustion surface away from the reference circular hole.

[0016] On the basis of conforming to the common sense in the art, the above-mentioned preferred conditions can be arbitrarily combined to obtain the preferred embodiments of the present utility model.

[0017] The positive and progressive effects of the utility model are:

[0018] The above-mentioned constant-cross-section charge with the property of full-section surface reduction has the property of full-section surface reduction, and can produce a more stable near-transverse interior ballistic curve when combined with a single-surface increase charge (circular hole); the constant-cross-section charge can be used for mass production of a variety of propellants to reduce production costs; compared with the common constant-surface reduction charge, a thicker meat thickness can be used to achieve a longer constant-surface reduction combustion; compared with the constant-surface reduction charge with grooves directly reaching the thermal insulation layer, a thinner thermal insulation layer can be used to reduce the weight of the thermal insulation material; in summary, this charge can achieve full-section surface reduction combustion characteristics without opening the grooves to the outer surface of the charge; the combined interior ballistic curve is smoother and the thermal protection difficulty is lower than the original charge (grooved columnar charge with grooves opened to the outer surface of the charge), which is more in line with the main engine's requirements for interior ballistic curves and thermal protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0020] Figure 2 It is a structural schematic diagram of the end face of the medicine column of the utility model.

[0021] Description of Reference Numerals

[0022] 1. Grain column; 2. Star angle groove; 201. Inner reduction burning surface; 202. Reference circular hole; 203. Outer arc surface. DETAILED DESCRIPTION

[0023] The present invention is further described below by way of embodiments, but the present invention is not limited to the scope of the embodiments.

[0024] like Figure 1-2 As shown, a uniform cross-section charge with full-section surface reduction properties includes a charge column 1; and also includes: a star-angle groove 2, wherein the star-angle groove 2 is arranged in the middle of the charge column 1, and a plurality of internal surface reduction combustion surfaces 201 are arranged around the star-angle groove 2; the plurality of internal surface reduction combustion surfaces 201 are distributed in a circular array around the star-angle groove 2.

[0025] In the specific implementation, the groove is opened to the inside of the charge 1, not to the outer surface of the charge 1; at the same time, the star-angle groove 2 thereon has a plurality of internal surface-reducing combustion surfaces 201, so that the charge 1 has the characteristics of surface-reducing combustion throughout the entire section.

[0026] Specifically, a reference circular hole 202 is provided in the middle of the star angle slot 2, and the reference circular hole 202 is located at the axis of the drug column 1; the reference circular hole 202 serves as a reference surface.

[0027] like Figure 1-2 As shown, as a specific technical solution, the inner reducing surface combustion surface 201 is composed of two strip grooves; a V-shaped structure is formed between the two strip grooves of the inner reducing surface combustion surface 201; and the angle between the two strip grooves of the inner reducing surface combustion surface 201 is 28-32°.

[0028] By designing the inner surface-reducing combustion surface 201 and utilizing the structure of the combustion surface, the full-section surface-reducing combustion characteristics of the long star-angle three-star-hole charge column 1 can be achieved.

[0029] like Figure 1-2 As shown, in a specific implementation, one end of the inner reducing surface combustion surface 201 close to the reference circular hole 202 is connected to the reference circular hole 202; a chamfer is provided between the end of the inner reducing surface combustion surface 201 close to the reference circular hole 202 and the reference circular hole 202; an outer arc surface 203 is provided at the end of the inner reducing surface combustion surface 201 away from the reference circular hole 202.

[0030] The design of the outer arc surface 203 can effectively reduce the stress on the outer end of the star angle.

[0031] In summary, this type of charge can achieve the full-section reduced-surface combustion characteristics without opening the grooves to the outer surface of the charge 1; it makes the combined internal ballistic curve smoother and the thermal protection difficulty lower than the original charge type (grooved column-shaped charge 1 with the grooves opened to the outer surface of the charge 1), and it is more in line with the main engine's requirements for the internal ballistic curve and thermal protection.

[0032] The utility model is not limited to the above-mentioned embodiments. Any changes in shape or structure are within the protection scope of the utility model. The protection scope of the utility model is defined by the attached claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principle and essence of the utility model, but these changes and modifications are within the protection scope of the utility model.

Claims

1. A uniform cross-section medicine with full-section reduced surface property, comprising a medicine column (1); characterized in that: Also includes: A star angle groove (2), wherein the star angle groove (2) is arranged in the middle of the charge column (1), and a plurality of inner surface reduction combustion surfaces (201) are arranged around the star angle groove (2); A plurality of the inner reducing surface combustion surfaces (201) are distributed in a circular array around the star angle groove (2); a reference circular hole (202) is provided in the middle of the star angle groove (2), and the reference circular hole (202) is located at the axis of the charge column (1); the inner reducing surface combustion surface (201) is composed of two strip grooves; a V-shaped structure is formed between the two strip grooves of the inner reducing surface combustion surface (201); an outer arc surface (203) is provided at one end of the inner reducing surface combustion surface (201) away from the reference circular hole (202).

2. The uniform cross-section medicine form with full-section reduction properties as claimed in claim 1, characterized in that: The angle between the two strip-shaped grooves of the inner reducing surface combustion surface (201) is 28-32°.

3. The uniform cross-section medicine form with full-section reduction property as claimed in claim 1, characterized in that: One end of the inner reducing surface combustion surface (201) close to the reference circular hole (202) is connected to the reference circular hole (202).

4. The uniform cross-section medicine form with full-section reduction property as claimed in claim 1, characterized in that: A chamfered corner is provided between one end of the inner reduction surface combustion surface (201) close to the reference circular hole (202) and the reference circular hole (202).

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