Two-stage combustion chamber engine extension structure with buffering and energy absorption function

Abstract

The present invention discloses a two-stage combustion chamber engine extension structure with a buffering and energy-absorbing function, and relates to the technical field of engine combustion chamber structures. Compared with previous engine combustion chambers, the present invention solves the problem that the impact force generated when the movable flange contacts the fixed flange during the movement of the two-stage combustion chamber easily causes structural damage and destruction, and the safety performance of the instrument cannot be guaranteed; by designing a nested double combustion chamber structure and introducing an expansion section and a sizing section structure that adjusts the cone angle range, the mixing ratio and mixing process of fuel and air are optimized, the space utilization inside the combustion chamber is maximized, unnecessary volume and weight are reduced, and the engine as a whole is more compact and lightweight; at the same time, a detachable thin-walled metal tube is configured on the outside as a deceleration device to reduce the impact speed of the high-pressure gas inside the combustion chamber on key components such as the flange, effectively preventing damage and risks caused by high-speed collisions, and can also be easily repaired and replaced.

Description

Technical Field

[0001] The present invention relates to the technical field of engine combustion chamber structures, and in particular to a two-stage combustion chamber engine extension structure with buffering and energy absorption functions. Background Art

[0002] In order to save the volume occupied by the combustion chamber in the launcher to reduce costs and improve combustion efficiency, the two-stage combustion chambers are overlapped. When the engine leaves the launcher and works, the overlapping combustion chambers are extended by relying on the pressure of the ignition gas to increase the volume of the combustion gas.

[0003] However, when the engine leaves the launcher, it ignites and relies on the ignition pressure to generate aerodynamic force to shear the limit structure. The secondary combustion chamber and the nozzle move backward rapidly under the action of gas pressure. When the moving and static flanges come into contact, a huge impact force is generated, causing structural damage and destruction. The flange end is easily damaged and the safety performance of the instrument cannot be guaranteed.

[0004] In order to solve the above problems, the present invention proposes a two-stage combustion chamber engine extension structure with a buffering and energy-absorbing function. Summary of the Invention

[0005] The purpose of the present invention is to propose a two-stage combustion chamber engine extension structure with a buffering and energy-absorbing function to solve the problems raised in the background technology:

[0006] In the prior art, when the engine leaves the launcher, during the movement of the secondary combustion chamber, when the movable flange contacts the fixed flange, a huge impact force is generated, causing structural damage and destruction. The flange end is easily damaged and the safety performance of the instrument cannot be guaranteed.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] A two-stage combustion chamber engine extension structure with a buffering and energy-absorbing function comprises: a main body, the main body including a primary combustion chamber disposed inside, a secondary combustion chamber disposed outside the primary combustion chamber, and a thin-walled metal shell disposed outside the secondary combustion chamber; one end of the primary combustion chamber is connected to one end of the thin-walled metal shell via a connector disposed at one end of the main body to form a fixed body, and the other end of the primary combustion chamber is fixedly provided with a fixing flange;

[0009] The secondary combustion chamber is rigidly connected to a movable flange arranged on the inner side of the connecting body. The movable flange is connected to the thin-walled metal shell through a limiting mechanism. The secondary combustion chamber is also rigidly connected to the nozzle on the other side of the main body. A nozzle cover is also provided at the nozzle mouth of the nozzle.

[0010] Preferably, the thin-walled metal shell is designed to be detachable.

[0011] Preferably, the movable flange includes two structures, a sizing section and an expanding section, which are connected to each other. The cone angle of the expanding section is set between 5° and 15°.

[0012] Preferably, the secondary combustion chamber and the nozzle extend with the fixed flange as a guide button.

[0013] A method for extending a two-stage combustion chamber engine with a buffering energy absorption function comprises the following steps:

[0014] S1: When the engine is ignited, the pressure of the gunpowder gas instantly generates thrust on the nozzle and the secondary combustion chamber. The mobile flange generates an impulse, breaking the limit mechanism. The mobile flange, the secondary combustion chamber and the nozzle form a moving body. The moving body uses the fixed flange as a guide button to generate a movement trend.

[0015] S2: The interaction force between the moving flange and the thin-walled metal shell causes the thin-walled metal shell to deform plastically. The moving flange continues to move. As the plastic deformation of the thin-walled metal shell increases, the buffering force of the thin-walled metal shell on the moving body gradually stabilizes from the initial sudden increase. At this time, the buffering force is greater than the gas pressure, and the moving body decelerates.

[0016] S3: When the movable flange moves to contact with the fixed flange, the contact force between the movable flange and the fixed flange gradually decreases until the movement stops.

[0017] Preferably, in S3, when the movable flange moves to contact the fixed flange, the secondary combustion chamber extends out, and the primary combustion chamber and the secondary combustion chamber are connected in series to form an enlarged combustion chamber.

[0018] Compared with the prior art, the present invention provides a two-stage combustion chamber engine extension structure with a buffering and energy-absorbing function, which has the following beneficial effects:

[0019] The present invention optimizes the mixing ratio and mixing process of fuel and air by designing a nested dual-combustion chamber structure and introducing an expansion section and a sizing section structure that adjusts the cone angle range, ensuring a more complete and uniform combustion reaction; maximizes the space utilization inside the combustion chamber, reduces unnecessary volume and weight, and makes the engine as a whole more compact and lightweight; at the same time, a detachable thin-walled metal tube is arranged on the outside as a deceleration device to reduce the impact speed of the high-pressure gas inside the combustion chamber on key components such as the flange, effectively preventing damage and risks caused by high-speed collisions, and can also be easily repaired and replaced. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic plan view of the contracted state of the combustion chamber of the two-stage engine mentioned in Example 1 of the present invention;

[0021] Figure 2 This is a schematic plan view of the engine combustion chamber in an extended state mentioned in Example 1 of the present invention;

[0022] Figure 3 This is a partially enlarged schematic diagram of the thin-walled metal tube structure mentioned in Example 1 of the present invention;

[0023] Figure 4 This is a schematic diagram of the cone angle experimental model mentioned in Example 1 of the present invention;

[0024] Figure 5 Schematic diagram of the buffer force-path curves for different cone angles mentioned in Example 1 of the present invention.

[0025] Meaning of the marks in the figure:

[0026] 1: Connector, 2: Moving flange, 3: Limiting mechanism, 4: Primary combustion chamber, 5: Secondary combustion chamber, 6: Thin-walled metal shell, 7: Fixed flange, 8: Nozzle, 9: Nozzle cover. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0028] The present invention optimizes the fuel-air mixing ratio and mixing process by designing a nested dual-combustion chamber structure and introducing an expansion section and a sizing section structure that adjusts the cone angle range, ensuring a more complete and uniform combustion reaction. It also maximizes the use of space inside the combustion chamber, reduces unnecessary volume and weight, and makes the engine more compact and lightweight overall. At the same time, a detachable thin-walled metal tube is configured on the outside as a deceleration device to reduce the impact speed of the high-pressure gas inside the combustion chamber on key components such as the flange, effectively preventing damage and risks caused by high-speed collisions, and also allowing for easy maintenance and replacement. Specifically, it includes the following content.

[0029] Example 1:

[0030] See also Figure 1-5 The present invention's extended structure for a two-stage combustion chamber engine with a buffering and energy-absorbing function comprises a main body comprising a primary combustion chamber 4 disposed within, a secondary combustion chamber 5 disposed peripherally thereto, and a removable thin-walled metal shell 6 disposed peripherally thereto. The primary combustion chamber 4 primarily functions as a preliminary combustion chamber, with the resulting high-temperature, high-pressure gas entering the secondary combustion chamber 5 for further combustion and energy release. The removable thin-walled metal shell 6 facilitates subsequent maintenance, significantly improving the engine's flexibility and economic efficiency.

[0031] One end of the first-stage combustion chamber 4 is connected to one end of the thin-walled metal shell 6 through a connector 1 provided at one end of the main body to form a fixed body, and the other end of the first-stage combustion chamber 4 is fixedly provided with a fixing flange 7; the outermost thin-walled metal shell 6 is the key part of the seat support and connection, and is fixedly connected to the first-stage combustion chamber 4, which can ensure the stability of the structure and is convenient for operation during installation, commissioning and maintenance.

[0032] The secondary combustion chamber 5 is rigidly connected to the movable flange 2 provided on the inner side of the connector 1. The movable flange 2 is connected to the thin-walled metal shell 6 via a limit mechanism 2. The secondary combustion chamber 5 is also rigidly connected to the nozzle 8 on the other side of the main body. A nozzle cover 9 is also provided at the nozzle mouth. The thin-walled metal shell 6 fits tightly with the secondary combustion chamber, which can enhance the overall strength of the structure and ensure the stability of the gas flow in the combustion chamber. Figure 3 The movable flange 2 also introduces the structure of the expansion section and the sizing section, wherein t represents the wall thickness of the thin-walled metal tube 6, l1 is the height of the expansion section, l2 is the height of the sizing section, and d is the inner diameter of the small end. Figure 4 , a two-stage combustion chamber with an outer diameter of 189.4mm, a moving flange with a travel of 300mm, and 45# steel are used as the material. The energy absorption characteristics of thin-walled metal tubes with different cone angles are studied using LS-DYNA finite element software. When other conditions are the same, according to the formula F=ma, the buffering force can be represented by the acceleration a. The experimental results are shown in the figure. Figure 5 As shown in the figure, the buffering force is the smallest when the cone angle α of the movable flange 2 is 7°. As the angle increases, the buffering force value gradually increases. Therefore, the cone angle α of the movable flange 2 is preferably set to 5° to 15°, which can reduce resistance and extend the service life of the thin-walled metal tube.

[0033] Example 2:

[0034] See also Figure 1-2 The present invention provides a method for extending a two-stage combustion chamber engine having a buffering and energy-absorbing function, comprising the following steps:

[0035] S1: When the engine is ignited, the pressure of the gunpowder gas instantly generates thrust on the nozzle 8 and the secondary combustion chamber 5. The movable flange 2 generates an impulse, breaking the limit mechanism 2. The movable flange 2, the secondary combustion chamber 5 and the nozzle 8 form a moving body. The moving body uses the fixed flange 7 as a guide button to generate a movement trend.

[0036] S2: Due to the presence of the boss, interaction forces occur between the moving flange 2 and the thin-walled metal shell 6, causing the thin-walled metal shell 6 to undergo plastic deformation, generating plastic deformation performance and losing some of the moving body's kinetic energy. As the moving flange 2 continues to move, the plastic deformation of the thin-walled metal shell 6 increases, the deformation performance increases, and the kinetic energy loss of the moving body increases. The initial sudden increase in the buffering force of the thin-walled metal shell 6 gradually becomes stable. At this point, the buffering force is greater than the gas pressure, and the moving body decelerates.

[0037] S3: When the movable flange 2 moves to contact with the fixed flange 7, the kinetic energy is almost completely lost, the contact force between the movable flange 2 and the fixed flange 7 is very small, and the movable flange 2 stops moving. At this time, the secondary combustion chamber 5 extends, and the primary combustion chamber 4 and the secondary combustion chamber 5 are connected in series, expanding the combustion chamber volume.

[0038] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A two-stage combustion chamber engine extension structure with a buffering and energy-absorbing function, characterized in that: include: A main body, the main body comprising a primary combustion chamber (4) arranged inside, a secondary combustion chamber (5) arranged outside the primary combustion chamber (4), and a thin-walled metal shell (6) arranged outside the secondary combustion chamber (5); the thin-walled metal shell (6) is designed to be detachable; one end of the primary combustion chamber (4) is connected to one end of the thin-walled metal shell (6) through a connector (1) arranged at one end of the main body to form a fixed body, and the other end of the primary combustion chamber (4) is fixedly provided with a fixing flange (7); The secondary combustion chamber (5) is rigidly connected to a movable flange (2) provided on the inner side of the connecting body (1); the movable flange (2) is connected to a thin-walled metal shell (6) via a limiting mechanism (3); the secondary combustion chamber (5) is also rigidly connected to a nozzle (8) on the other side of the main body; a nozzle cover (9) is also provided at the nozzle opening of the nozzle; The movable flange (2) comprises two structures: a sizing section and an expanding section which are connected to each other, and the cone angle of the expanding section is set between 5° and 15°; The secondary combustion chamber (5) and the nozzle (8) extend with the fixed flange (7) as a guide button.

2. The method for using the two-stage combustion chamber engine extension structure with buffering and energy absorption function as claimed in claim 1, characterized in that: The steps include: S1: When the engine is ignited, the pressure of the gunpowder gas instantly generates thrust on the nozzle (8) and the secondary combustion chamber (5), and the movable flange (2) generates an impulse, breaking the limit mechanism (3). The movable flange (2), the secondary combustion chamber (5) and the nozzle (8) form a moving body, and the moving body uses the fixed flange (7) as a guide button to generate a movement trend; S2: an interaction force occurs between the moving flange (2) and the thin-walled metal shell (6), causing the thin-walled metal shell (6) to undergo plastic deformation. The moving flange (2) continues to move. As the plastic deformation of the thin-walled metal shell (6) increases, the buffering force of the thin-walled metal shell (6) on the moving body gradually stabilizes from the sudden increase at the beginning. At this time, the buffering force is greater than the pressure of the gas, and the moving body performs a deceleration motion. S3: When the movable flange (2) moves to contact with the fixed flange (7), the contact force between the movable flange (2) and the fixed flange (7) gradually decreases until the movement stops.

3. The method for using the two-stage combustion chamber engine extension structure with buffering and energy absorption function according to claim 2, characterized in that: In the S3, when the movable flange (2) moves to contact the fixed flange (7), the secondary combustion chamber (5) extends out, and the primary combustion chamber (4) and the secondary combustion chamber (5) are connected in series to form an enlarged combustion chamber.

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