POGO vibration suppression system and POGO vibration suppression method

Abstract

The invention discloses a POGO vibration suppression system and a POGO vibration suppression method, and belongs to the field of liquid carrier rocket power systems. The pressure accumulator is a sealed pressure container internally provided with a containing cavity. The propellant storage tank conveying pipe is communicated with the accommodating cavity; the pressure accumulator is configured to be a propellant conveyed to the containing cavity through the propellant storage box conveying pipe, and an air pillow for restraining POGO vibration is formed on the upper portion of the containing cavity; the inlet end of the gas injection pipeline is connected with the propellant pressurizing pipeline; the outlet end of the gas injection pipeline communicates with the accommodating cavity at the upper part of the pressure accumulator; the gas injection pipeline is configured to achieve volume control of the gas pillow by filling the containing cavity with gasified propellant volume. An extra helium source does not need to be carried, inflation is not needed before launching, the complexity of a power system on a rocket is greatly reduced, and the launching reliability is also improved.

Description

Technical Field

[0001] The invention relates to the field of liquid launch vehicle power systems, and in particular to a POGO vibration suppression system and a POGO vibration suppression method. Background Art

[0002] POGO vibration refers to the unstable low-frequency vibration caused by the mutual coupling of the dynamic characteristics of the liquid launch vehicle's structural system and the propulsion system. During the launch process, it is automatically generated, increased, then reduced or even disappeared as the rocket flies. This vibration may damage the payload or exceed the astronauts' tolerance limit. Generally, large liquid launch vehicles generally have the potential danger of longitudinal coupled vibration during flight.

[0003] The method of suppressing the longitudinal vibration of POGO is to install a large centralized elastic element - accumulator at the inlet of the engine pump. According to the different types of accumulators, they are usually divided into spring type, air storage type and air injection type.

[0004] The existing Chinese invention patent CN117006111A discloses an air-injected accumulator, a POGO vibration suppression system and a POGO vibration suppression method, which utilizes a helium-injected accumulator to achieve POGO vibration suppression for large-scale carrier rockets. This solution adopts a helium pressurization solution, and the high-pressure helium cylinder is inflated before the rocket is launched. During the flight, the accumulator charging solenoid valve is opened and closed in real time to replenish air according to the required air pillow volume in the accumulator air chamber. This solution increases the complexity of the rocket system, requiring the carrying of additional helium gas sources and rocket components such as charging valves, and the ground system also requires matching charging tooling. In addition, this solution is also prone to cause gas cylinder leakage before the rocket launch, causing launch delays.

[0005] In view of this, it is necessary to provide a new technical solution to solve the above problems. Summary of the invention

[0006] In order to solve the above technical problems, the present application provides a POGO vibration suppression system and a POGO vibration suppression method, and proposes a solution for gas injection using self-generated pressurized gas in the tank. There is no need to carry an additional helium gas source, and there is no need to inflate before shooting, which greatly reduces the complexity of the power system on the arrow and improves the reliability of the launch.

[0007] A POGO vibration suppression system, comprising: Accumulator; the accumulator is a sealed pressure container having a receiving chamber inside; the propellant tank delivery pipe is connected to the receiving chamber; the accumulator is configured so that the propellant delivered to the receiving chamber by the propellant tank delivery pipe forms an air pillow on the upper part of the receiving chamber to suppress the vibration of the POGO; An air injection pipeline; the inlet end of the air injection pipeline is connected to the propellant boosting pipeline, and the outlet end of the air injection pipeline is connected to the accommodating cavity at the upper part of the accumulator; the air injection pipeline is configured to achieve volume control of the air pillow by filling the accommodating cavity with the volume of vaporized propellant.

[0008] Preferably, it also includes a liquid level detection device disposed inside the accommodating chamber for detecting the liquid level of the propellant inside the accommodating chamber.

[0009] Preferably, it also includes a discharge pipeline for discharging excess gas in the accommodating chamber.

[0010] Preferably, the discharge pipeline is connected to the accommodating chamber; and the discharge port of the discharge pipeline is located above the horizontal plane of the highest point where the propellant tank delivery pipe is connected to the accommodating chamber.

[0011] Preferably, the discharge pipeline is provided with an emergency discharge valve for controlling its on-off function.

[0012] Preferably, the gas injection pipeline is provided with a stop valve and a flow limiting device; the stop valve and the flow limiting device are arranged in series on the gas injection pipeline.

[0013] Preferably, the stop valve is an electromagnetic stop valve.

[0014] Preferably, the flow limiting device is a throttling orifice plate.

[0015] According to another aspect of the present application, a POGO vibration suppression method is also provided, wherein the POGO vibration suppression is achieved by using a POGO vibration suppression system; the POGO vibration suppression system includes an accumulator, an air injection pipeline, a liquid level detection device, and a discharge pipeline; The accumulator is a sealed pressure container having a receiving cavity inside; the propellant tank delivery pipe is connected to the receiving cavity; the accumulator is configured so that the propellant delivered to the receiving cavity by the propellant tank delivery pipe forms an air pillow on the upper part of the receiving cavity to suppress the vibration of the POGO; The inlet end of the gas injection pipeline is connected to the propellant boosting pipeline, and the outlet end of the gas injection pipeline is connected to the accommodating chamber at the upper part of the accumulator; the gas injection pipeline is configured to realize the volume control of the air pillow by filling the accommodating chamber with the volume of gasified propellant; the gas injection pipeline is provided with a stop valve and a flow limiting device; the stop valve and the flow limiting device are arranged in series on the gas injection pipeline; The liquid level detection device is arranged inside the accommodating chamber, and is used to detect the liquid level of the propellant inside the accommodating chamber; The discharge pipeline is connected to the accommodating chamber; the discharge port of the discharge pipeline is located above the horizontal plane of the highest point where the propellant tank delivery pipe is connected to the accommodating chamber; an emergency discharge valve for controlling its on and off is provided on the discharge pipeline; POGO vibration suppression methods include: Before the rocket is launched, propellant is added to the propellant tank, and the propellant enters the containing cavity through the propellant tank delivery pipe and forms an air pillow on the upper part of the containing cavity; During the rocket flight, the liquid level detection device detects the propellant liquid level in the containing chamber, and calculates the volume of the air pillow based on the propellant liquid level; The inflation is controlled according to the pre-set air cushion volume required for different flight periods and the corresponding upper and lower limits of the liquid level, thereby achieving POGO vibration suppression.

[0016] Preferably, the inflation control is performed according to the preset air pillow volume required for different flight periods and the corresponding upper and lower limits of the liquid level, including: The rocket power control system collects the liquid level height in the containing chamber through the liquid level detection device; When the volume of the air pillow in the accommodation chamber is small, open the stop valve on the air injection pipeline to inflate the accommodation chamber. When the liquid level drops to the lower limit range, the stop valve is closed to achieve the ability to suppress POGO. When the liquid level in the containing chamber is too low, open the emergency discharge valve to exhaust air to increase the liquid level of the propellant in the containing chamber to ensure the safety of the engine.

[0017] Compared with the prior art, this application has at least the following beneficial effects: 1. The principle of the gas injection accumulator system of the present invention is simple, which reduces the complexity of the air supply system on the rocket and on the ground, and improves the launch reliability of the rocket.

[0018] 2. The present invention uses self-generated pressurized gas to inject gas into the accumulator, without the need to carry an additional gas source, and the system structure is simple.

[0019] 3. The present invention does not require inflation before launch, which reduces the complexity of the ground system and simplifies the launch steps.

[0020] 4. The present invention greatly reduces the weight on the arrow and improves the carrying capacity of the rocket.

[0021] 5. The present invention can detect the liquid level in the accommodating chamber through the liquid level detection device inside the accumulator, and effectively determine the inflation timing. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Hereinafter, some specific embodiments of the present invention will be described in detail in an exemplary and non-limiting manner with reference to the accompanying drawings. The same reference numerals in the accompanying drawings indicate the same or similar components or parts. It should be understood by those skilled in the art that these drawings are not necessarily drawn to scale. In the accompanying drawings: Figure 1 Schematic diagram of system connection of the POGO vibration suppression system of the present invention.

[0023] The above drawings include the following reference numerals: 10. Accumulator; 11. Accommodating chamber; 12. Liquid level detection device; 20. Gas injection pipeline; 21. Stop valve; 22. Current limiting device; 30. Discharge pipeline; 31. Emergency discharge valve; 40. Propellant tank; 50. Propellant tank delivery pipe; 51. Connecting hole; 60. Propellant booster pipeline. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the present application clearer, the technical solution of the present application will be clearly and completely described below in combination with the specific embodiments of the present application and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present application.

[0025] Example 1

[0026] like Figure 1 As shown, a POGO vibration suppression system includes: an accumulator 10 and an air injection pipeline 20.

[0027] The accumulator 10 is a sealed pressure container having a housing chamber 11 therein; the propellant tank delivery pipe 50 is connected to the housing chamber 11; the accumulator 10 is configured such that the propellant delivered to the housing chamber 11 by the propellant tank delivery pipe 50 forms an air pillow on the upper part of the housing chamber 11 to suppress the vibration of the POGO.

[0028] Among them, the propellant tank delivery pipe 50 is a pipeline between the propellant tank 40 and the rocket engine pump, which is used to deliver the corresponding propellant to the rocket engine pump. It can be an oxidizer delivery pipe or a fuel delivery pipe.

[0029] In this embodiment, a connecting hole 51 is provided on the propellant tank delivery pipe 50 located in the accommodating chamber 11. Relying on the connecting function of the connecting hole 51, the propellant in the propellant tank delivery pipe 50 can enter the accommodating chamber 11 and form an air pillow on the upper part of the accommodating chamber 11.

[0030] Preferably, the connecting hole 51 is arranged on the propellant tank delivery pipe 50 at the lower part of the accommodating chamber 11. This arrangement can ensure that while an air pillow is formed at the upper part of the accommodating chamber 11, the gas in the air pillow is prevented from entering the propellant tank delivery pipe 50 through the connecting hole 51 to the greatest extent, thereby ensuring the safety of the engine.

[0031] Preferably, the accumulator 10 is installed at the end of the propellant tank delivery pipe 50 so as to be as close as possible to the rocket engine pump inlet to improve the effectiveness of POGO vibration suppression.

[0032] The inlet end of the gas injection pipeline 20 is connected to the propellant boosting pipeline 60, and the outlet end of the gas injection pipeline 20 is connected to the accommodating chamber 11 at the upper part of the accumulator 10; the gas injection pipeline 20 is configured to achieve volume control of the air pillow by filling the accommodating chamber 11 with the volume of vaporized propellant.

[0033] It should be noted that the propellant pressurizing pipeline 60 is a branch pipeline led out from the high-pressure delivery pipeline after the engine pump, which is used to pressurize the propellant tank 40 to ensure that the propellant is stably delivered to the engine pump and pumped to the rocket engine. The propellant in the branch of the high-pressure delivery pipeline after the engine pump is vaporized by the evaporator and adjusted to a suitable temperature to form pressurized gas. The pressurized gas is introduced into the propellant tank 40 through the propellant pressurizing pipeline 60 for pressurization. The propellant pressurizing pipeline 60 is a vertical pipeline connecting the engine pressurized gas outlet and the propellant tank 40 pressurized gas inlet.

[0034] As another embodiment of the present invention, the POGO vibration suppression system further includes a liquid level detection device 12 disposed inside the accommodating chamber 11 for detecting the liquid level of the propellant inside the accommodating chamber 11 .

[0035] As another embodiment of the present invention, the POGO vibration suppression system further includes an exhaust pipeline 30 for exhausting excess gas in the accommodating chamber 11. The exhaust pipeline 30 is connected to the accommodating chamber 11; the exhaust port of the exhaust pipeline 30 is located above the horizontal plane of the highest point where the propellant tank delivery pipe 50 is connected to the accommodating chamber 11.

[0036] Preferably, the discharge pipeline 30 is provided with an emergency discharge valve 31 for controlling its on-off.

[0037] As another embodiment of the present invention, the gas injection pipeline 20 is provided with a stop valve 21 and a flow limiting device 22 ; the stop valve 21 and the flow limiting device 22 are arranged in series on the gas injection pipeline 20 .

[0038] Preferably, the stop valve 21 is an electromagnetic stop valve.

[0039] Preferably, the flow limiting device 22 is a throttling orifice plate.

[0040] Example 2

[0041] A POGO vibration suppression method is provided, which realizes POGO vibration suppression by utilizing a POGO vibration suppression system.

[0042] like Figure 1 As shown, the POGO vibration suppression system includes an accumulator 10, an air injection pipeline 20, a liquid level detection device 12, and a discharge pipeline 30; The accumulator 10 is a sealed pressure container having a receiving chamber 11 therein; the propellant tank delivery pipe 50 is connected to the receiving chamber 11; the accumulator 10 is configured such that the propellant delivered to the receiving chamber 11 by the propellant tank delivery pipe 50 forms an air pillow on the upper part of the receiving chamber 11 to suppress the vibration of the POGO; The inlet end of the gas injection pipeline 20 is connected to the propellant pressurizing pipeline 60, and the outlet end of the gas injection pipeline 20 is connected to the accommodating chamber 11 at the upper part of the accumulator 10; the gas injection pipeline 20 is configured to realize the volume control of the air pillow by charging the volume of the gasified propellant into the accommodating chamber 11; the gas injection pipeline 20 is provided with a stop valve 21 and a flow limiting device 22; the stop valve 21 and the flow limiting device 22 are arranged in series on the gas injection pipeline 20; The liquid level detection device 12 is disposed inside the accommodating chamber 11 and is used to detect the liquid level of the propellant inside the accommodating chamber 11; The discharge pipeline 30 is connected to the accommodating chamber 11; the discharge port of the discharge pipeline 30 is located above the horizontal plane of the highest point where the propellant tank delivery pipe 50 is connected to the accommodating chamber 11; the discharge pipeline 30 is provided with an emergency discharge valve 31 for controlling its on and off.

[0043] Furthermore, the POGO vibration suppression system in this embodiment may also include all the components in Embodiment 1, and the connection relationship and position relationship of each component are the same as those in Embodiment 1, which will not be repeated here.

[0044] The POGO vibration suppression method includes the following steps: S1. Before the rocket is launched, propellant is added to the propellant tank. The propellant enters the accommodating chamber 11 through the propellant tank delivery pipe 50 and forms an air pillow on the upper part of the accommodating chamber 11.

[0045] S2. During the rocket flight, the liquid level detection device 12 detects the propellant liquid level in the accommodating chamber 11, and calculates the volume of the air pillow based on the propellant liquid level.

[0046] Specifically, since the total height of the accommodating chamber 11 and the cross-sectional area at each height are determined, the height of the air pillow can be determined by detecting the liquid level, and then converted into the volume of the air pillow.

[0047] S3. Inflation control is performed according to the air cushion volume required for different flight periods and the corresponding upper and lower limits of the liquid level, thereby achieving POGO vibration suppression.

[0048] Among them, the inflation control is performed according to the air pillow volume required for different flight periods and the corresponding upper and lower limits of the liquid level, including: The rocket power control system collects the liquid level height in the accommodating chamber 11 through the liquid level detection device 12; When the volume of the air pillow in the accommodating chamber 11 is small, the stop valve 21 on the air injection pipeline 20 is opened to inflate the accommodating chamber 11, and the stop valve 21 is closed after the liquid level drops to the lower limit range, so as to achieve the ability to suppress POGO; When the liquid level in the accommodating chamber 11 is too low, the emergency discharge valve 31 is opened to exhaust gas to increase the liquid level of the propellant in the accommodating chamber 11 to ensure the safety of the engine.

[0049] When the liquid level in the accommodating chamber 11 is too low, there may be a risk that the gas in the accommodating chamber 11 will enter the engine pump inlet. An emergency exhaust device is provided in the accumulator 10. By providing a discharge line 30 in the POGO vibration suppression system, the emergency discharge valve 31 can be opened to exhaust when the liquid level is too low, thereby increasing the propellant liquid level in the accommodating chamber 11 to ensure engine safety.

[0050] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0051] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0052] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0053] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A POGO vibration suppression system, comprising a pressure accumulator (10) and an air injection pipeline (20); characterized in that: The accumulator (10) is a sealed pressure container having a receiving chamber (11) therein; the propellant tank delivery pipe (50) is in communication with the receiving chamber (11); the accumulator (10) is configured such that the propellant delivered to the receiving chamber (11) by the propellant tank delivery pipe (50) forms an air pillow on the upper part of the receiving chamber (11) to suppress vibration of the POGO; The inlet end of the gas injection pipeline (20) is connected to the propellant pressurizing pipeline (60), and the outlet end of the gas injection pipeline (20) is in communication with the accommodating chamber (11) at the upper part of the accumulator (10); the gas injection pipeline (20) is configured to achieve volume control of the air pillow by charging the volume of gasified propellant into the accommodating chamber (11).

2. The POGO vibration suppression system according to claim 1, characterized in that: It also includes a liquid level detection device (12) disposed inside the accommodating chamber (11) and used for detecting the liquid level of the propellant inside the accommodating chamber (11).

3. The POGO vibration suppression system according to claim 2, characterized in that: It also includes a discharge pipeline (30) for discharging excess gas in the accommodating chamber (11).

4. The POGO vibration suppression system according to claim 3, characterized in that: The discharge pipeline (30) is in communication with the accommodating chamber (11); a discharge port of the discharge pipeline (30) is located above the horizontal plane of the highest point where the propellant tank delivery pipe (50) is in communication with the accommodating chamber (11).

5. The POGO vibration suppression system according to claim 4, characterized in that: The discharge pipeline (30) is provided with an emergency discharge valve (31) for controlling its on and off.

6. The POGO vibration suppression system according to claim 5, characterized in that: The gas injection pipeline (20) is provided with a stop valve (21) and a flow limiting device (22); the stop valve (21) and the flow limiting device (22) are arranged in series on the gas injection pipeline (20).

7. The POGO vibration suppression system according to claim 6, characterized in that: The stop valve (21) is an electromagnetic stop valve.

8. The POGO vibration suppression system according to claim 7, characterized in that: The flow limiting device (22) is a throttling orifice plate.

9. A POGO vibration suppression method, characterized in that: A POGO vibration suppression system is used to achieve POGO vibration suppression; the POGO vibration suppression system comprises a pressure accumulator (10), an air injection pipeline (20), a liquid level detection device (12) and a discharge pipeline (30); The accumulator (10) is a sealed pressure container having a receiving chamber (11) therein; the propellant tank delivery pipe (50) is in communication with the receiving chamber (11); the accumulator (10) is configured such that the propellant delivered to the receiving chamber (11) by the propellant tank delivery pipe (50) forms an air pillow on the upper part of the receiving chamber (11) to suppress vibration of the POGO; The inlet end of the gas injection pipeline (20) is connected to the propellant pressurizing pipeline (60), and the outlet end of the gas injection pipeline (20) is in communication with the accommodating chamber (11) at the upper part of the pressure accumulator (10); the gas injection pipeline (20) is configured to achieve volume control of the air pillow by charging the volume of gasified propellant into the accommodating chamber (11); the gas injection pipeline (20) is provided with a stop valve (21) and a flow limiting device (22); the stop valve (21) and the flow limiting device (22) are arranged in series on the gas injection pipeline (20); The liquid level detection device (12) is arranged inside the accommodating chamber (11) and is used to detect the liquid level of the propellant inside the accommodating chamber (11); The discharge pipeline (30) is in communication with the accommodating chamber (11); a discharge port of the discharge pipeline (30) is located above the horizontal plane of the highest point where the propellant tank delivery pipe (50) is in communication with the accommodating chamber (11); an emergency discharge valve (31) for controlling the on-off of the discharge pipeline (30); POGO vibration suppression methods include: Before the rocket is launched, propellant is added to the propellant tank (40), and the propellant enters the accommodating chamber (11) through the propellant tank delivery pipe (50), and forms an air pillow on the upper part of the accommodating chamber (11); During the flight of the rocket, the liquid level of the propellant in the accommodating chamber (11) is detected by the liquid level detection device (12), and the volume of the air pillow is calculated according to the propellant liquid level; The inflation is controlled according to the pre-set air cushion volume required for different flight periods and the corresponding upper and lower limits of the liquid level, thereby achieving POGO vibration suppression.

10. The POGO vibration suppression method according to claim 9, characterized in that: The inflation control is performed according to the air pillow volume required for different flight periods and the corresponding upper and lower limits of the liquid level, including: The rocket power control system collects the height of the liquid level in the accommodating chamber (11) through the liquid level detection device (12); When the volume of the air pillow in the accommodating chamber (11) is small, the stop valve (21) on the air injection pipeline (20) is opened to inflate air into the accommodating chamber (11), and the stop valve (21) is closed after the liquid level drops to a lower limit range, so as to achieve the ability to suppress POGO; When the liquid level in the accommodating chamber (11) is too low, the emergency discharge valve (31) is opened to discharge gas so as to increase the liquid level of the propellant in the accommodating chamber (11) and ensure the safety of the engine.

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