A POGO vibration suppression system and a POGO vibration suppression method

Abstract

The present invention discloses a POGO vibration suppression system and a POGO vibration suppression method, belonging to the field of the liquid launch vehicle power system, which includes an accumulator and an injection gas pipeline; the accumulator is a sealed pressure vessel with an accommodation cavity inside; the propellant tank delivery pipe is communicated with the accommodation cavity; the accumulator is configured to rely on the propellant delivered to the accommodation cavity by the propellant tank delivery pipe, and an air cushion for suppressing POGO vibration is formed in the upper part of the accommodation cavity; the inlet end of the injection gas pipeline is connected to the propellant pressurization pipeline, and the outlet end of the injection gas pipeline is communicated with the accommodation cavity above the accumulator; the injection gas pipeline is configured to realize the volume control of the air cushion by filling the accommodation cavity with the volume of the vaporized propellant. The present invention does not need to carry an additional helium gas source, nor does it need to be inflated before launch, which greatly reduces the complexity of the on-board power system and improves the reliability of the launch.

Description

Technical Field

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

[0002] POGO vibration refers to the unstable low-frequency vibration generated by the interaction between the structural system and the propulsion system of a liquid launch vehicle. It automatically generates, increases, then decreases and even disappears during the launch process. This vibration may damage the payload or exceed the tolerance limit of astronauts. Generally, large liquid launch vehicles generally have the potential danger of longitudinal coupled vibration during flight.

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

[0004] The existing Chinese invention patent CN117006111A discloses an air injection type accumulator, a POGO vibration suppression system and a POGO vibration suppression method, which uses a helium air injection type accumulator to realize the POGO vibration suppression of large launch vehicles. This scheme adopts a helium pressurization scheme. Before the rocket launch, the high-pressure helium gas cylinder is inflated. During the flight, the opening and closing of the accumulator inflation solenoid valve are controlled in real time according to the required air pillow volume in the accumulator air chamber for air replenishment. This scheme increases the complexity of the rocket system, requires additional helium gas sources and on-board components such as inflation valves, and the ground system also needs to be equipped with inflation tooling. In addition, this scheme is also prone to gas cylinder leakage before the rocket launch, resulting in a launch delay.

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

[0006] To solve the above technical problems, the present application provides a POGO vibration suppression system and a POGO vibration suppression method, and proposes a scheme of injecting gas using the self-pressurizing gas of the storage tank, which does not require carrying an additional helium gas source and does not require inflation before launch, greatly reducing the complexity of the on-board power system and improving the launch reliability.

[0007] A POGO vibration suppression system includes:

[0008] An accumulator; the accumulator is a sealed pressure vessel with an accommodation chamber inside; the propellant storage tank delivery pipe is communicated with the accommodation chamber; the accumulator is configured to rely on the propellant delivered to the accommodation chamber by the propellant storage tank delivery pipe, and an air pillow for suppressing POGO vibration is formed in the upper part of the accommodation chamber;

[0009] Injection gas pipeline; the inlet end of the injection gas pipeline is connected to the propellant pressurization pipeline, and the outlet end of the injection gas pipeline communicates with the accommodation chamber above the accumulator; the injection gas pipeline is configured to control the volume of the gas pillow by filling the accommodation chamber with the volume of the vaporized propellant.

[0010] Preferably, it further includes a liquid level detection device disposed inside the accommodation chamber for detecting the liquid level of the propellant inside the accommodation chamber.

[0011] Preferably, it further includes an exhaust pipeline for discharging the excess gas in the accommodation chamber.

[0012] Preferably, the exhaust pipeline communicates with the accommodation chamber; the discharge port of the exhaust pipeline is above the horizontal plane at the highest point of the connection between the propellant storage tank delivery pipe and the accommodation chamber.

[0013] Preferably, an emergency exhaust valve for controlling its on-off is provided on the exhaust pipeline.

[0014] Preferably, the injection gas 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 injection gas pipeline.

[0015] Preferably, the stop valve is an electromagnetic stop valve.

[0016] Preferably, the flow limiting device is an orifice plate.

[0017] According to another aspect of the present application, a POGO vibration suppression method is also provided, which realizes POGO vibration suppression by using a POGO vibration suppression system; the POGO vibration suppression system includes an accumulator, an injection gas pipeline, a liquid level detection device and an exhaust pipeline;

[0018] The accumulator is a sealed pressure vessel with an accommodation chamber inside; the propellant storage tank delivery pipe communicates with the accommodation chamber; the accumulator is configured to rely on the propellant delivered to the accommodation chamber by the propellant storage tank delivery pipe, and a gas pillow for suppressing POGO vibration is formed above the accommodation chamber;

[0019] The inlet end of the injection gas pipeline is connected to the propellant pressurization pipeline, and the outlet end of the injection gas pipeline communicates with the accommodation chamber above the accumulator; the injection gas pipeline is configured to control the volume of the gas pillow by filling the accommodation chamber with the volume of the vaporized propellant; the injection gas 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 injection gas pipeline;

[0020] The liquid level detection device is disposed inside the accommodation chamber for detecting the liquid level of the propellant inside the accommodation chamber;

[0021] The discharge pipeline is communicated with the accommodation cavity; the discharge port of the discharge pipeline is located above the horizontal plane at the highest point of the connection between the propellant tank delivery pipe and the accommodation cavity; an emergency discharge valve for controlling its on-off is arranged on the discharge pipeline.

[0022] The POGO vibration suppression method includes:

[0023] Before the rocket is launched, propellant is filled into the propellant tank. The propellant enters the accommodation cavity through the propellant tank delivery pipe and forms a gas cushion in the upper part of the accommodation cavity.

[0024] During the flight of the rocket, the liquid level detection device is used to detect the propellant liquid level in the accommodation cavity, and the gas cushion volume is calculated based on the propellant liquid level.

[0025] Inflation control is carried out according to the preset gas cushion volumes required for different flight periods and the corresponding upper and lower limits of the liquid level range, so as to realize POGO vibration suppression.

[0026] Preferably, the inflation control according to the preset gas cushion volumes required for different flight periods and the corresponding upper and lower limits of the liquid level range includes:

[0027] The rocket power control system collects the liquid level height in the accommodation cavity through the liquid level detection device.

[0028] When the gas cushion volume in the accommodation cavity is small, the stop valve on the injection pipeline is opened to inflate the accommodation cavity, and the stop valve is closed after the liquid level drops to the lower limit range to achieve the ability to suppress POGO.

[0029] When the liquid level in the accommodation cavity is too low, the emergency discharge valve is opened for exhaust to increase the liquid level of the propellant in the accommodation cavity and ensure the safety of the engine.

[0030] Compared with the prior art, the present application has at least the following beneficial effects:

[0031] 1. The principle of the gas injection accumulator system of the present invention is simple, which reduces the complexity of the on-board and ground gas supply systems and improves the launch reliability of the rocket.

[0032] 2. The present invention injects gas into the accumulator through the self-generated pressurized gas, without the need to carry an additional gas source, and the system structure is simple.

[0033] 3. The present invention does not need to be inflated before launch, which reduces the complexity of the ground system and simplifies the launch steps.

[0034] 4. The present invention greatly reduces the weight on the rocket and improves the carrying capacity of the rocket.

[0035] 5. The present invention can detect the liquid level in the accommodation cavity through the liquid level detection device inside the accumulator, and effectively judge the inflation timing. Brief Description of the Drawings

[0036] Some specific embodiments of the present invention will be described in detail hereinafter with reference to the accompanying drawings in an illustrative rather than restrictive manner. The same reference numerals in the drawings denote the same or similar components or parts. Those skilled in the art should understand that these drawings are not necessarily drawn to scale. In the drawings:

[0037] Figure 1 It is a schematic diagram of the system connection of the POGO vibration suppression system of the present invention.

[0038] Among them, the above-mentioned drawings include the following reference numerals:

[0039] 10, accumulator; 11, accommodation chamber; 12, liquid level detection device; 20, gas injection pipeline; 21, stop valve; 22, flow limiting device; 30, discharge pipeline; 31, emergency discharge valve; 40, propellant tank; 50, propellant tank delivery pipe; 51, communication hole; 60, propellant pressurization pipeline. Detailed Description of the Specific Embodiments

[0040] To make the objectives, technical solutions, and advantages of the present application clearer, the technical solutions of the present application will be clearly and completely described below in conjunction with the specific embodiments of the present application and the corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts shall fall within the protection scope of the present application.

[0041] Embodiment 1

[0042] As Figure 1 shown, a POGO vibration suppression system includes: an accumulator 10 and a gas injection pipeline 20.

[0043] The accumulator 10 is a sealed pressure vessel with an accommodation chamber 11 inside; the propellant tank delivery pipe 50 communicates with the accommodation chamber 11; the accumulator 10 is configured to rely on the propellant delivered to the accommodation chamber 11 through the propellant tank delivery pipe 50, and an air cushion for suppressing POGO vibration is formed in the upper part of the accommodation chamber 11.

[0044] Among them, the propellant tank delivery pipe 50 is a pipeline between the propellant tank 40 and the rocket engine pump, and is used to deliver the corresponding propellant to the rocket engine pump, and it can be an oxidizer delivery pipe or a fuel delivery pipe.

[0045] In this embodiment, a communication hole 51 is provided on the propellant tank delivery pipe 50 located in the accommodation chamber 11. Relying on the communication function of the communication hole 51, the propellant in the propellant tank delivery pipe 50 can enter the accommodation chamber 11 and an air cushion can be formed in the upper part of the accommodation chamber 11.

[0046] Preferably, the communication hole 51 is provided on the propellant tank delivery pipe 50 at the lower part of the accommodation chamber 11. This arrangement can ensure that while an air cushion is formed in the upper part of the accommodation chamber 11, the gas in the air cushion can be maximally prevented from entering the propellant tank delivery pipe 50 through the communication hole 51, thereby ensuring the safety of the engine.

[0047] Preferably, the accumulator 10 is installed at the end of the propellant tank delivery pipe 50 to be as close as possible to the rocket engine pump inlet, so as to improve the effectiveness of POGO vibration suppression.

[0048] The inlet end of the gas injection pipeline 20 is connected to the propellant pressurization pipeline 60, and the outlet end of the gas injection pipeline 20 communicates with the accommodation chamber 11 above the accumulator 10; the gas injection pipeline 20 is configured to control the volume of the air cushion by filling the accommodation chamber 11 with the volume of the vaporized propellant.

[0049] It should be noted that the propellant pressurization pipeline 60 is a branch pipeline led out from the high-pressure delivery pipeline behind the engine pump, and is used to pressurize the propellant tank 40 to ensure that the propellant is stably delivered into the engine pump and pumped into the rocket engine. The propellant in the branch of the high-pressure delivery pipeline behind 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 pressurization pipeline 60 for pressurization. The propellant pressurization pipeline 60 is a vertical pipeline connecting the engine pressurized gas outlet and the propellant tank 40 pressurized gas inlet.

[0050] As another embodiment of the present invention, the POGO vibration suppression system further includes a liquid level detection device 12 provided inside the accommodation chamber 11 for detecting the liquid level of the propellant inside the accommodation chamber 11.

[0051] As another embodiment of the present invention, the POGO vibration suppression system further includes an exhaust pipeline 30 for discharging the excess gas in the accommodation chamber 11. The exhaust pipeline 30 communicates with the accommodation chamber 11; the discharge port of the exhaust pipeline 30 is located above the horizontal plane at the highest point of the connection between the propellant tank delivery pipe 50 and the accommodation chamber 11.

[0052] Preferably, an emergency discharge valve 31 for controlling its on-off is provided on the exhaust pipeline 30.

[0053] 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 connected in series on the gas injection pipeline 20.

[0054] Preferably, the stop valve 21 is an electromagnetic stop valve.

[0055] Preferably, the flow limiting device 22 is an orifice plate.

[0056] Embodiment 2

[0057] A POGO vibration suppression method realizes POGO vibration suppression by using a POGO vibration suppression system.

[0058] As Figure 1 shown, the POGO vibration suppression system includes an accumulator 10, an injection pipeline 20, a liquid level detection device 12, and a discharge pipeline 30;

[0059] The accumulator 10 is a sealed pressure vessel with an accommodation cavity 11 inside; a propellant tank delivery pipe 50 is communicated with the accommodation cavity 11; the accumulator 10 is configured to rely on the propellant delivered to the accommodation cavity 11 through the propellant tank delivery pipe 50, and an air cushion for suppressing POGO vibration is formed in the upper part of the accommodation cavity 11;

[0060] The inlet end of the injection pipeline 20 is connected to a propellant pressurization pipeline 60, and the outlet end of the injection pipeline 20 is communicated with the accommodation cavity 11 above the upper part of the accumulator 10; the injection pipeline 20 is configured to realize the volume control of the air cushion by filling the accommodation cavity 11 with the volume of the vaporized propellant; a stop valve 21 and a flow limiting device 22 are provided on the injection pipeline 20; the stop valve 21 and the flow limiting device 22 are arranged in series on the injection pipeline 20;

[0061] The liquid level detection device 12 is arranged inside the accommodation cavity 11 and is used for detecting the liquid level of the propellant inside the accommodation cavity 11;

[0062] The discharge pipeline 30 is communicated with the accommodation cavity 11; the discharge port of the discharge pipeline 30 is located above the horizontal plane at the highest point of the connection between the propellant tank delivery pipe 50 and the accommodation cavity 11; an emergency discharge valve 31 for controlling its on-off is provided on the discharge pipeline 30.

[0063] Furthermore, the POGO vibration suppression system in this embodiment may further include all the components in Embodiment 1, and the connection relationship and position relationship of each component are also the same as those in Embodiment 1, which will not be elaborated here.

[0064] The POGO vibration suppression method includes the following steps:

[0065] S1. Before the rocket is launched, propellant is filled into the propellant tank, and the propellant enters the accommodation cavity 11 through the propellant tank delivery pipe 50, and an air cushion is formed in the upper part of the accommodation cavity 11.

[0066] S2. During the flight of the rocket, the liquid level detection device 12 is used to detect the liquid level of the propellant in the accommodation cavity 11, and the air cushion volume is calculated based on the propellant liquid level.

[0067] Specifically, since the total height and the cross-sectional areas at each height in the accommodation cavity 11 are determined, the air cushion height can be determined by detecting the liquid level, and then it can be converted into the air cushion volume.

[0068] S3. Inflation control is carried out according to the required air pillow volume and the corresponding upper and lower liquid level ranges for different preset flight periods, thereby achieving POGO vibration suppression.

[0069] Among them, the inflation control according to the required air pillow volume and the corresponding upper and lower liquid level ranges for different preset flight periods includes:

[0070] The rocket power control system collects the liquid level height in the accommodation chamber 11 through the liquid level detection device 12;

[0071] When the air pillow volume in the accommodation chamber 11 is small, the cut-off valve 21 on the injection pipeline 20 is opened to inflate the accommodation chamber 11, and the cut-off valve 21 is closed after the liquid level drops to the lower limit range to achieve the ability to suppress POGO;

[0072] When the liquid level in the accommodation chamber 11 is too low, the emergency discharge valve 31 is opened for exhaust to increase the liquid level of the propellant in the accommodation chamber 11 and ensure the safety of the engine.

[0073] Since there may be a risk that the gas in the accommodation chamber 11 enters the engine pump inlet when the liquid level in the accommodation chamber 11 is too low, an emergency exhaust device is provided in the accumulator 10. In the POGO vibration suppression system, by setting the discharge pipeline 30, the emergency discharge valve 31 can be opened for exhaust when the liquid level is too low, thereby increasing the liquid level of the propellant in the accommodation chamber 11 and ensuring the safety of the engine.

[0074] For the sake of description, spatial relative terms such as "above...", "over...", "on the upper surface of...", "upper" etc. can be used here to describe the spatial position relationship between a device or feature shown in the figure and other devices or features. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation of the device described in the figure. For example, if the device in the attached drawing is inverted, the device described as "above other devices or structures" or "over other devices or structures" will be positioned as "below other devices or structures" or "under other devices or structures" afterwards. Thus, the exemplary term "above..." can include both the orientations of "above..." and "below...". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the corresponding explanations for the spatial relative descriptions used here are made.

[0075] 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 also be understood that when the terms "comprising" and / or "including" are used in this specification, they specify the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0076] It should be noted that the terms "first", "second", etc. in the description 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 such data can be interchanged under appropriate circumstances so that the embodiments of the present application described herein can be implemented in an order different from those illustrated or described herein.

[0077] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A POGO vibration suppression method, characterized in that, POGO vibration suppression is achieved by using a POGO vibration suppression system; the POGO vibration suppression system includes an accumulator (10), an injection pipeline (20), a liquid level detection device (12), and a discharge pipeline (30); The accumulator (10) is a sealed pressure vessel with an accommodation chamber (11) inside; a propellant tank delivery pipe (50) communicates with the accommodation chamber (11); the accumulator (10) is configured to rely on the propellant delivered to the accommodation chamber (11) through the propellant tank delivery pipe (50), and an air cushion for suppressing POGO vibration is formed in the upper part of the accommodation chamber (11); The inlet end of the injection pipeline (20) is connected to a propellant pressurization pipeline (60), and the outlet end of the injection pipeline (20) communicates with the accommodation chamber (11) above the accumulator (10); the injection pipeline (20) is configured to achieve volume control of the air cushion by filling the accommodation chamber (11) with the volume of vaporized propellant; a stop valve (21) and a flow limiting device (22) are provided on the injection pipeline (20); the stop valve (21) and the flow limiting device (22) are arranged in series on the injection pipeline (20); The liquid level detection device (12) is arranged inside the accommodation chamber (11) for detecting the liquid level of the propellant inside the accommodation chamber (11); The discharge pipeline (30) communicates with the accommodation chamber (11); the discharge port of the discharge pipeline (30) is above the horizontal plane at the highest point of the connection between the propellant tank delivery pipe (50) and the accommodation chamber (11); an emergency discharge valve (31) for controlling its on-off is provided on the discharge pipeline (30); The POGO vibration suppression method includes: Before the rocket launches, propellant is filled into the propellant tank (40), and the propellant enters the accommodation chamber (11) through the propellant tank delivery pipe (50), and an air cushion is formed in the upper part of the accommodation chamber (11); During the rocket flight, the liquid level of the propellant in the accommodation chamber (11) is detected by the liquid level detection device (12), and the air cushion volume is calculated based on the propellant liquid level; Inflation control is performed according to the air cushion volumes required in different preset flight periods and the corresponding upper and lower liquid level ranges, thereby achieving POGO vibration suppression.

2. The POGO vibration suppression method according to claim 1, wherein The inflation control according to the air cushion volumes required in different preset flight periods and the corresponding upper and lower liquid level ranges includes: The rocket power control system collects the liquid level height in the accommodation chamber (11) through the liquid level detection device (12); When the air cushion volume in the accommodation chamber (11) is small, the stop valve (21) on the injection pipeline (20) is opened to inflate the accommodation chamber (11), and the stop valve (21) is closed after the liquid level drops to the lower limit range to achieve the ability to suppress POGO; When the liquid level in the accommodation chamber (11) is too low, the emergency discharge valve (31) is opened for exhaust to increase the liquid level of the propellant in the accommodation chamber (11) and ensure the safety of the engine.

3. The POGO vibration suppression method according to claim 1, wherein The stop valve (21) is an electromagnetic stop valve.

4. The POGO vibration suppression method according to claim 1, characterized in that, The flow limiting device (22) is an orifice plate.

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