Power device, rocket and design method of power device

Abstract

The invention relates to the technical field of rocket power, in particular to a power device, a rocket and a design method of the power device.The power device comprises a combined combustion chamber and a spray pipe, the combined combustion chamber comprises at least one section of combustion chamber, and the combustion chamber located at the tail of the combined combustion chamber is clamped with the spray pipe through a clamping part; and under the condition that the combined combustion chamber comprises a plurality of sections of combustion chambers, every two adjacent sections of combustion chambers are clamped through the clamping parts. Aiming at the use requirements of short period and combination of a solid axial power device, in particular to a booster with more diversified capability levels, the difficulty in designing manpower, time period, tool mold and production cost in production of various design states can be overcome, redesign of explosive types is not needed, and reproduction of molds is not needed.

Description

Technical Field

[0001] The present invention relates to the field of rocket propulsion technology, and in particular to a power device, a rocket and a design method of the power device. Background Art

[0002] Solid rocket propulsion devices rely on parallel layer combustion of propellants to generate flow, and high-pressure gas is accelerated and ejected through the nozzle to form thrust. From the perspective of momentum conservation, the flow of the power device determines the thrust of the power device. Therefore, when the diameter of the power device remains unchanged, the matching of the axial length basically determines the size of the charge, and indirectly determines the level of thrust.

[0003] Due to the particularity of the solid propulsion device molding process, each size of the power device requires designated matching corresponding tooling and dies, so power devices with different charge sizes can only be redesigned, put into production core mold tooling, and charge molding, and cannot use the existing combustion chamber. Therefore, it is difficult for solid propulsion devices to achieve serialization, standardization, and combination within the same diameter range. Summary of the invention

[0004] The present invention provides a power device, a rocket and a design method for a power device, so as to solve one of the defects in the prior art. It is aimed at the short-cycle and combined use requirements of solid axial power devices, especially boosters with relatively diverse capability levels. It can overcome the difficulties of putting into production various design states in terms of design manpower, time cycle, tooling and molds, and production costs, and does not require redesigning the medicine form or re-commissioning the mold.

[0005] The present invention provides a power device, including a combined combustion chamber and a nozzle, wherein the combined combustion chamber includes at least one combustion chamber, and the combustion chamber located at the tail of the combined combustion chamber is clamped with the nozzle through a clamping part. When the combined combustion chamber includes multiple combustion chambers, the tail of the head combustion chamber is clamped with the head of the combined combustion chamber through a clamping part between two adjacent combustion chambers, and the head of the combined combustion chamber is the head of the middle combustion chamber or the head of the nozzle.

[0006] According to a power device provided by the present invention, the combined combustion chamber includes a head section combustion chamber and a tail section combustion chamber, the head section of the middle tail section combustion chamber is clamped with the tail section of the head section combustion chamber via the clamping portion, the tail section of the tail section combustion chamber is clamped with the head section of the nozzle via the clamping portion, and the tail section of the middle combustion chamber is clamped with the head section of the nozzle.

[0007] According to a power device provided by the present invention, the middle combustion chamber of the combined combustion chamber also includes at least one middle section combustion chamber and one tail section combustion chamber. When the combined combustion chamber includes a plurality of middle section combustion chambers, each of the middle section combustion chambers is sequentially connected head to tail along its axial direction by the clamping portion, the head of the middle section combustion chamber is clamped with the tail of the head section combustion chamber by the clamping portion, and the head of the tail section combustion chamber is clamped with the tail of the middle section combustion chamber by the clamping portion.

[0008] According to a power device provided by the present invention, the head section combustion chamber, the middle combustion chamber and the nozzle all include a shell, a fixing frame and a charge, the fixing frame is arranged on the inner side of the shell, the charge is arranged on the fixing frame, and each charge is independent of each other.

[0009] According to a power device provided by the present invention, the middle section combustion chamber, the tail section combustion chamber and the head of the nozzle are all provided with a first clamping portion, the head section combustion chamber and the tail of the middle section combustion chamber are all provided with a second clamping portion, and the first clamping portion is engaged with the second clamping portion.

[0010] According to a power device provided by the present invention, the shell and the fixing frame cooperate to form the first clamping part and the second clamping part, one of the first clamping part and the second clamping part is restricted by the shell and the fixing frame to form a slot, and the other restricts an insertion block, and the insertion block cooperates with the slot for insertion.

[0011] According to a power device provided by the present invention, the slot is located inside the shell.

[0012] According to a power device provided by the present invention, at least one of the housing of the first clamping part and the housing of the second clamping part is provided with a groove at a contact position with the other, and a sealing member is provided in the groove.

[0013] The present invention also provides a rocket, comprising the power device as described above.

[0014] The present invention also provides a design method for a power device, which is applied to the power device as described above, and comprises: Based on the preset theoretical thrust, a standard boost thrust model formed by sequentially connecting a head combustion chamber, a tail combustion chamber and a nozzle is obtained; Based on the theoretical thrust and required thrust of the head combustion chamber of the standard booster force model, the theoretical thrust of each middle combustion chamber and tail combustion chamber to be combined is obtained; Based on the theoretical thrust of each mid-stage combustion chamber and tail-stage combustion chamber to be combined, the burning rate coefficient of each mid-stage combustion chamber and tail-stage combustion chamber to be combined is obtained.

[0015] The power device provided by the present invention is mainly composed of a combined combustion chamber and a nozzle. The combined combustion chamber includes at least one combustion chamber, each of which includes a head, a barrel and a tail. Each combustion chamber can be designed according to the combustion surface balance section. The clamping interfaces between two adjacent combustion chambers and between the combined combustion chamber and the nozzle are consistent, that is, they are all clamped by the clamping part, and have interchangeability and versatility. Therefore, the combined combustion chamber can be designed with different numbers or types of combustion chambers according to the requirements of different power devices. It can be that only one combustion chamber is clamped with the nozzle, or multiple combustion chambers are clamped in sequence along the axial extension direction of the combined combustion chamber, and then clamped with the nozzle, and then combined and matched into power devices with different thrust scales according to different thrust requirements.

[0016] The present invention is aimed at the demand for short-cycle and combined use of solid axial power devices, especially boosters with diverse capability levels, and can overcome the difficulties of design manpower, time cycle, tooling and molds, and production costs in the production of various design states. Whether it is a two-stage power device, a three-stage power device, or a four-stage high-thrust power device, there is no need to redesign the medicine type or re-produce the mold. Before the combination of each combustion chamber, batch production is carried out, the process is simplified, the feasibility is good, and the versatility is increased. The design, production, and tooling are greatly simplified, and the work efficiency is improved.

[0017] For the power of large launch vehicles, a bundled combined power, i.e. a parallel power system, is generally selected. The power unit does not change, but the structural layout is different. The power device of the present invention is an axial series combustion chamber mode. The power units themselves are different. Different power units can be combined through different combustion chambers, and a single design and production model can be used to match a variety of power units.

[0018] In addition to the technical problems solved by the present invention, the technical features of the technical solutions constituted, and the advantages brought about by the technical features of these technical solutions described above, other technical features of the present invention and the advantages brought about by these technical features will be further explained in conjunction with the accompanying drawings or will be understood through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 is a schematic structural diagram of a power device provided by an embodiment of the present invention; Figure 2is a structural schematic diagram of the clamping position of the power device provided by an embodiment of the present invention; Figure 3 It is a schematic diagram of the structure of each combustion chamber of the power device provided in an embodiment of the present invention.

[0021] Reference numerals: 100, head combustion chamber; 110, igniter; 200, combustion chamber; 210, middle combustion chamber; 220, tail combustion chamber; 300, nozzle; 410, housing; 420, fixing frame; 430, powder column; 510, first clamping portion; 520, second clamping portion; 530, slot; 540, insert block; 550, groove. DETAILED DESCRIPTION

[0022] The following embodiments of the present invention are described in further detail in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0023] In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limitations on the embodiments of the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0024] In the description of the embodiments of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0025] In the embodiments of the present invention, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0026] In addition, in the description of the embodiments of the present invention, unless otherwise specified, "multiple", "multiple roots", and "multiple groups" mean two or more, and "several", "several roots", and "several groups" mean one or more.

[0027] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiment of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0028] like Figure 1 As shown, the power device provided by the embodiment of the present invention includes a combined combustion chamber and a nozzle 300. The combined combustion chamber includes at least one combustion chamber 200. The combustion chamber 200 located at the tail of the combined combustion chamber is clamped with the nozzle 300 through a clamping part. In the case where the combined combustion chamber includes multiple combustion chambers 200, two adjacent combustion chambers 200 are also clamped together through a clamping part.

[0029] The power device of the embodiment of the present invention is mainly composed of a combined combustion chamber and a nozzle 300. The combined combustion chamber includes at least one combustion chamber 200. Each combustion chamber 200 includes a head, a barrel and a tail. Each combustion chamber 200 can be designed according to the combustion surface balance section. The clamping interfaces between two adjacent combustion chambers 200 and between the combined combustion chamber and the nozzle 300 are consistent, that is, they are all clamped by the clamping part, and have interchangeability and versatility. Therefore, the combined combustion chamber can be designed with a combination of different numbers or types of combustion chambers according to different power device requirements. It can be that only one combustion chamber 200 is clamped with the nozzle 300, or multiple combustion chambers 200 are clamped in sequence along the axial extension direction of the combined combustion chamber, and then clamped with the nozzle 300, and then combined and matched into power devices with different thrust scales according to different thrust requirements.

[0030] The present invention is aimed at the demand for short-cycle and combined use of solid axial power devices, especially boosters with diverse capability levels, and can overcome the difficulties of design manpower, time cycle, tooling and molds, and production costs in the production of various design states. Whether it is a two-stage power device, a three-stage power device, or a four-stage high-thrust power device, there is no need to redesign the medicine type or re-produce the mold. Before the combination of each section of the combustion chamber 200, it is mass-produced, the process is simplified, the feasibility is good, and the versatility is increased. The design, production, and tooling are greatly simplified, and the work efficiency is improved.

[0031] For the power of large launch vehicles, a bundled combined power, i.e., a parallel power system, is generally selected. The power unit does not change, but the structural layout is different. The power device of the present invention is an axial series combustion chamber mode. The power units themselves are different. Different power units can be combined through different combustion chambers 200, and a single design and production model can be used to match multiple power units.

[0032] According to an embodiment provided by the present invention, the combined combustion chamber includes a head-stage combustion chamber 100 and a tail-stage combustion chamber 220, the head of the tail-stage combustion chamber 220 is clamped with the tail of the head-stage combustion chamber 100 through a clamping portion, and the tail of the tail-stage combustion chamber 220 is clamped with the head of the nozzle 300 through a clamping portion.

[0033] In this embodiment, by combining different structures of the combustion chamber, a variety of combination modes can be achieved, such as short type, basic type, extended type and other power devices.

[0034] In one embodiment, when the combined combustion chamber has only one combustion chamber 200, the combustion chamber 200 is the head section combustion chamber 100. When designing an actual power plant, the head section combustion chamber 100 is generally in a fixed state, and a common ignition device is installed at the head of the head section combustion chamber 100. The propellant charge type of the barrel of the head section combustion chamber 100 is designed to be in an independent balanced pressure state, that is, the combustion surface movement process is a steady state charge type design. The tail of the head section combustion chamber 100 can be directly connected to the head of the nozzle 300 through the clamping part to form an ultra-short booster type power plant.

[0035] In another embodiment, when the combined combustion chamber is a combination of two combustion chambers 200, the two combustion chambers are respectively a fixed head section combustion chamber 100 and a tail section combustion chamber 220, that is, a tail section combustion chamber 220 is added between the head section combustion chamber 100 and the nozzle 300, and the head section combustion chamber 100, the tail section combustion chamber 220 and the nozzle 300 are sequentially connected by a clamping part to ensure coaxiality and straightness. According to different types of combined combustion chambers, a standard type booster propulsion device is formed on the basis of the ultra-short booster propulsion device.

[0036] Therefore, the present invention can be assembled in various combinations under the premise that the nozzle 300 allows, forming a power device that meets the requirements of various platforms, and has strong combinability. The head section combustion chamber 100 and the tail section combustion chamber 220 can be designed according to the combustion surface balance section. The clamping interface between the head section combustion chamber 100, the tail section combustion chamber 220 and the nozzle 300 is consistent, and has interchangeability and versatility. The head section combustion chamber 100 and the tail section combustion chamber 220 can be combined and designed according to different power device requirements, and then combined and matched according to different thrust requirements to form a power device with different thrust scales.

[0037] According to an embodiment provided by the present invention, the combined combustion chamber also includes at least one middle section combustion chamber 210. When the combined combustion chamber includes multiple middle section combustion chambers 210, each middle section combustion chamber 210 is sequentially connected head to tail along its axial direction by a clamping part, the head of the middle section combustion chamber 210 is clamped to the tail of the head section combustion chamber 100 by a clamping part, and the head of the tail section combustion chamber 220 is clamped to the tail of the middle section combustion chamber 210 by a clamping part.

[0038] In this embodiment, when the combined combustion chamber is a combination of at least three combustion chambers 200, the combined combustion chamber is composed of a head section combustion chamber 100, a middle section combustion chamber 210 and a tail section combustion chamber 220, and the number of the middle section combustion chambers 210 can be determined according to actual design requirements. The head section combustion chamber 100, the middle section combustion chamber 210, the tail section combustion chamber 220 and the nozzle 300 can be coaxially connected in sequence through the clamping part to form an extended booster propulsion device.

[0039] On the basis of forming the structure of the standard booster propulsion device, a mid-section combustion chamber 210 can be further added between the head-section combustion chamber 100 and the tail-section combustion chamber 220. The basic design state of the mid-section combustion chamber 210 is an independent balanced pressure state, and there is no need to consider the risk of abnormal combustion surface caused by adding a combustion chamber. A customized nozzle 300 with a large throat diameter is installed at the rear end to form an extended booster propulsion device.

[0040] The head section combustion chamber 100, the middle section combustion chamber 210 and the tail section combustion chamber 220 can all be designed according to the combustion surface balance section. The card connection interfaces between the head section combustion chamber 100, the middle section combustion chamber 210, the tail section combustion chamber 220 and the nozzle 300 are consistent, and are interchangeable and universal. The combined combustion chamber can be designed in combination according to the requirements of different power units, and then combined and matched into power units of different thrust scales according to different thrust requirements.

[0041] like Figure 3 As shown, according to an embodiment provided by the present invention, the combustion chamber 200 and the nozzle 300 both include a shell 410, a fixing frame 420 and a charge 430, the fixing frame 420 is arranged inside the shell 410, the charge 430 is arranged on the fixing frame 420, and each charge 430 is independent of each other. In this embodiment, the head section combustion chamber 100, the middle section combustion chamber 210, the tail section combustion chamber 220 and the nozzle 300 are all independently designed, and considering the balance of pressure, they can work independently and can be freely combined.

[0042] The head section combustion chamber 100, the middle section combustion chamber 210, the tail section combustion chamber 220 and the nozzle 300 all have their own shells 410, fixing frames 420 and charge columns 430. The charge columns 430 are fixed to the inner side of the shells 410 by the fixing frames 420. After being assembled into a power unit, the charge columns 430 in each section combustion chamber 200 can also be designed independently without affecting each other.

[0043] The combined form shortens the length of each combustion chamber 200, reduces the stress level of the grain 430, reduces the difficulty of the charging process, and is conducive to production. Each combustion chamber 200 is independently charged with charge, which has low difficulty and high efficiency. Moreover, the burning rate of each combustion chamber 200 is controllable and adjustable, and high and low burning rate control is easier to achieve. Dual thrust form can be achieved without changing the trend of the combustion surface, and the scalability is good.

[0044] like Figure 2 As shown, according to an embodiment provided by the present invention, the heads of the mid-section combustion chamber 210, the tail-section combustion chamber 220 and the nozzle 300 are all provided with a first clamping portion 510, and the tails of the head-section combustion chamber 100 and the mid-section combustion chamber 210 are all provided with a second clamping portion 520, and the first clamping portion 510 and the second clamping portion 520 are engaged with each other.

[0045] In this embodiment, the head of the middle section combustion chamber 210, the head of the tail section combustion chamber 220 and the head of the nozzle 300 are all provided with a first clamping portion 510, and the tail of the head section combustion chamber 100, the tail of the middle section combustion chamber 210 and the tail of the tail section combustion chamber 220 are all provided with a second clamping portion 520. When the adjacent two end combustion chambers 200 are clamped, the first clamping portion 510 at the clamping position is clamped and connected with the second clamping portion 520.

[0046] The design of each section of the combustion chamber 200 takes into account versatility and interchangeability, so it is necessary to ensure that the interfaces used for clamping are coordinated and unified to ensure working reliability. The head and tail connection structure of each section of the combustion chamber 200 adopts a unified design, and the first clamping part 510 and the second clamping part 520 can be arranged in a ring around the circumference of the combustion chamber 200, that is, a clamping ring connection structure with good consistency and light weight is adopted, which has good versatility, interchangeability and reliability.

[0047] According to an embodiment provided by the present invention, the shell 410 and the fixing frame 420 cooperate to form a first clamping portion 510 and a second clamping portion 520, one of the first clamping portion 510 and the second clamping portion 520 is restricted by the shell 410 and the fixing frame 420 to form a slot 530, and the other restricts an insertion block 540, and the insertion block 540 cooperates with the slot 530 for insertion.

[0048] In this embodiment, the first clamping portion 510 and the second clamping portion 520 are both formed by the ends of the shell 410 and the fixing frame 420 of each combustion chamber 200, that is, the first clamping portion 510 and the second clamping portion 520 are part of the shell 410 and the fixing frame 420, thereby improving the structural stability of the shell 410 and the fixing frame 420, and effectively ensuring the structural strength of the clamping structure and the clamping position.

[0049] The shell 410 and the fixing frame 420 are located at the head position of each combustion chamber 200, and a slot 530 is formed between the shell 410 and the fixing frame 420, that is, the slot 530 is the first shell 410 and the fixing frame 420 located at the tail position of each combustion chamber 200, and the shell 410 forms an insert block 540. When the adjacent combustion chambers 200 at both ends are connected, the insert block 540 can be inserted into the slot 530, so as to realize the clamping of the first clamping part 510 and the second clamping part 520, and at the same time, the axial relative displacement and radial movement between the adjacent combustion chambers 200 can be avoided, so as to ensure the coaxiality and straightness of the connection.

[0050] In this embodiment, the slot 530 is formed in the housing 410 and the fixing frame 420 of the first clamping portion 510, and the insert block 540 is formed in the housing 410 of the second clamping portion 520. In other embodiments, the formation and coordination of the slot 530 and the insert block 540 in the first clamping portion 510 and the second clamping portion 520 can be varied and designed according to actual needs.

[0051] According to an embodiment provided by the present invention, the slot 530 is located inside the shell 410. In this embodiment, the fixing frame 420 at the head position of the combustion chamber 200 is bent toward the inside of the shell 410, and a gap is formed between the fixing frame 420 and the inner wall of the shell 410 at the head position of the combustion chamber 200, and the gap serves as the slot 530, and the shell 410 at the tail position of the combustion chamber 200 is bent toward the inside of the shell 410, and the bent portion serves as the plug 540.

[0052] This forms a connection between the slot 530 and the plug block 540 in the space inside the combustion chamber 200, that is, part of the connection position between the first clamping portion 510 and the second clamping portion 520 is arranged on the inner side of the shell 410, thereby reducing the structural protrusion of the power device at the connection position after the multi-stage combustion chamber 200 is combined, and reducing the radial space occupancy of the power device.

[0053] According to an embodiment provided by the present invention, at least one of the housing 410 of the first clamping part 510 and the housing 410 of the second clamping part 520 is provided with a groove 550 at the contact position with the other, and a sealing member is provided in the groove 550. In this embodiment, the surface of the second clamping part 520 in contact with the first clamping part 510 is provided with a groove 550, and a sealing member is embedded in the groove 550. After the first clamping part 510 and the second clamping part 520 are clamped, the first clamping part 510 and the second clamping part 520 are sealed by the sealing member, thereby ensuring the sealing of the combustion chamber 200 when assembled.

[0054] The rocket provided by the present invention is described below. The rocket described below and the power device described above can be referenced to each other.

[0055] An embodiment of the present invention also provides a rocket, comprising a power device as described in the above embodiment.

[0056] The rocket of the embodiment of the present invention is equipped with a solid axially combined power device, that is, under the same diameter scale, power devices with different thrust scales can be matched by axially combining different effective charge lengths.

[0057] The design method of the power device provided by the present invention is described below. The design method of the power device described below and the power device described above can be referenced to each other.

[0058] The embodiment of the present invention further provides a design method of a power device, which is applied to the power device of the above embodiment, and includes: Based on the preset theoretical thrust, a standard boost thrust model is obtained by sequentially connecting a head combustion chamber 100, a tail combustion chamber 220 and a nozzle 300; Based on the theoretical thrust and required thrust of the head stage combustion chamber 100 of the standard boost force model, the theoretical thrust of each of the middle stage combustion chamber 210 and the tail stage combustion chamber 220 to be combined is obtained; Based on the theoretical thrust of each mid-stage combustion chamber 210 and tail-stage combustion chamber 220 to be combined, the burning rate coefficient of each mid-stage combustion chamber 210 and tail-stage combustion chamber 220 to be combined is obtained.

[0059] Taking a small solid propulsion device as an example, based on the overall multi-condition exterior ballistic calculation analysis, several types of solid propulsion device boosters may be required. If it is put into production according to the traditional demonstration, design, development, and verification ideas, it will require a large amount of design resources, design manpower, tooling and molds, and repetitive test verification, which will take a long time and be costly.

[0060] The design method of the power device in the embodiment of the present invention can adopt the structural form of a combined power device to realize a layout of multiple models. First, the design input of the standard booster propulsion device is used as a benchmark, the preset theoretical thrust is the thrust of the power device with the highest demand obtained from market research, and the combustion chamber 200 charge structure that meets the overall requirements (F thrust-T time curve) is designed, and the technical parameters and charge parameters of the standard booster propulsion device are first determined.

[0061] After obtaining the theoretical thrust of each combustion chamber 200, each theoretical thrust can be substituted as F into the following formula to calculate the burning rate coefficient and the throat diameter of the nozzle accordingly.

[0062] P c =ρ×C*×a×(A b / A t )^(1 / (1-n)) F = η × C F ×P c ×A t Where: ρ is the density of the propellant, C* is the characteristic velocity, both of which are inherent properties of the propellant, n is the pressure exponent, P c is the pressure; A b is the basic combustion surface, is the inherent geometric size of the power unit, η is the working efficiency, C F is the thrust coefficient; a is the burning rate coefficient, A t is the throat diameter of the nozzle, and both can be used as design openings.

[0063] The design is based on the head combustion chamber 100 of the standard booster model, and F1 is the theoretical thrust of the head combustion chamber 100 of the standard booster model; The middle combustion chamber 210 to be combined can also be designed as a combustion chamber 200 with the same thrust value F1, or a combustion chamber 200 with a thrust theoretical value F2; and then they can be freely combined for use. The thrust combination usage statistics of the axial combination power device are shown in Table 1 below.

[0064] Table 1

[0065] On the basis of the extended booster propulsion device, by adjusting the propellant burning rate of the head and tail combustion chambers 220, the tail combustion chamber 220 uses a high-burning-rate propellant, and the head combustion chamber 100 and the middle combustion chamber 210 use a low-burning-rate propellant. Since each section of the charge design is in an independent equilibrium state, a single-chamber dual-thrust power device design state can be formed, which is beneficial to the overall ballistic realization.

[0066] On the basis of the standard booster propulsion device, by adjusting the propellant burning rate of the tail stage combustion chamber 220, a high burning rate form of the tail stage combustion chamber 220 and a low burning rate form of the head stage combustion chamber 100 can be formed, thereby realizing the characteristics of a single-chamber dual-thrust power device without adjusting the charge type, which is more conducive to improving the range.

[0067] In this embodiment, each section of the combustion chamber 200 is in an independently designed state. Considering the balance of pressure, it can work independently and can be freely combined. The overall design takes into account the segmented design, that is, it ensures the overall performance requirements and takes into account the feasibility of each section of the combustion chamber 200. Compared with conventional power units, the combustion chamber 200 has a greater degree of freedom in design. The combustion chamber 200 can be free from restrictions on the diameter. The segmented unit can be realized by designing the optimal slenderness ratio according to the optimal combustion surface trend. The optimal slenderness ratio and the optimal number of sections are allocated based on the most commonly used general units. The grain 430 in each section of the combustion chamber 200 is also independently designed and has the working characteristics of the constant pressure trend, laying a technical foundation for the combination type. The working time of each section of the combustion chamber 200 can be different according to the overall demand, and single thrust and multi-stage thrust modes can be realized. By matching the throat area, booster propulsion devices of different thrust scales can be realized, and serialization can be achieved.

[0068] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A power device, characterized in that: It includes a combined combustion chamber and a nozzle, wherein the combined combustion chamber includes at least one combustion chamber, and the combustion chamber located at the tail of the combined combustion chamber is clamped with the nozzle through a clamping part. When the combined combustion chamber includes multiple combustion chambers, two adjacent combustion chambers are also clamped together through a clamping part.

2. The power device according to claim 1, characterized in that: The combined combustion chamber comprises a head section combustion chamber and a tail section combustion chamber, the head section of the tail section combustion chamber is clamped with the tail section of the head section combustion chamber via the clamping portion, and the tail section of the tail section combustion chamber is clamped with the head section of the nozzle via the clamping portion.

3. The power device according to claim 2, characterized in that: The combined combustion chamber also includes at least one middle section combustion chamber. When the combined combustion chamber includes a plurality of middle section combustion chambers, each of the middle section combustion chambers is sequentially connected head to tail along its axial direction by the clamping portion, the head of the middle section combustion chamber is clamped with the tail of the head section combustion chamber by the clamping portion, and the head of the tail section combustion chamber is clamped with the tail of the middle section combustion chamber by the clamping portion.

4. The power device according to claim 3, characterized in that: The combustion chamber and the nozzle both include a shell, a fixing frame and a charge. The fixing frame is arranged on the inner side of the shell, and the charge is arranged on the fixing frame. Each charge is independent of each other.

5. The power device according to claim 4, characterized in that: The middle section combustion chamber, the tail section combustion chamber and the head of the nozzle are all provided with a first clamping part, the head section combustion chamber and the tail of the middle section combustion chamber are all provided with a second clamping part, and the first clamping part is clamped with the second clamping part.

6. The power device according to claim 5, characterized in that: The shell and the fixing frame cooperate to form the first clamping portion and the second clamping portion, one of the first clamping portion and the second clamping portion is restricted by the shell and the fixing frame to form a slot, and the other restricts an insertion block, and the insertion block cooperates with the slot for insertion.

7. The power device according to claim 6, characterized in that: The slot is located inside the shell.

8. The power device according to claim 5, characterized in that: At least one of the housing of the first clamping part and the housing of the second clamping part is provided with a groove at a contact position with the other, and a sealing member is provided in the groove.

9. A rocket, characterized in that: Comprising a power device as described in any one of claims 1 to 8.

10. A method for designing a power device, characterized in that: The power device according to any one of claims 2 to 8 comprises: Based on the preset theoretical thrust, a standard boost thrust model formed by sequentially connecting a head combustion chamber, a tail combustion chamber and a nozzle is obtained; Based on the theoretical thrust and required thrust of the head combustion chamber of the standard booster force model, the theoretical thrust of each middle combustion chamber and tail combustion chamber to be combined is obtained; Based on the theoretical thrust of each mid-stage combustion chamber and tail-stage combustion chamber to be combined, the burning rate coefficient of each mid-stage combustion chamber and tail-stage combustion chamber to be combined is obtained.

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