Outflow air entrainment suppression device for storage tank capable of repeatedly using partition plate

Abstract

The invention discloses a reusable partition plate storage box outflow entrained gas suppression device, and relates to the field of partition plate storage boxes, the reusable partition plate storage box outflow entrained gas suppression device comprises a main storage box, a partition plate storage box, multiple isolation valves and a suppression assembly, the main storage box is connected to the top of the partition plate storage box, the top of the partition plate storage box is a partition plate, the multiple isolation valves are arranged on the partition plate, and the suppression assembly is installed at the outlet positions of the isolation valves; and after the propellant enters the restraining assembly from the isolating valve, the flowing-out direction of the propellant from the restraining assembly is perpendicular to the outlet axis direction of the isolating valve. The problem of propellant air entrapment caused by bubbles generated by outflow of a rocket partition plate storage box which is repeatedly used is solved.

Description

Technical Field

[0001] The present invention relates to a reusable liquid rocket bulkhead tank conveying system, in particular to a gas inclusion suppression technology for a bulkhead tank during bulkhead outflow. Background Art

[0002] With the technological progress in the field of aerospace at home and abroad, reusability has become one of the main technical features of the new generation of rockets, and the partition tank solution has become an optional important technical solution (a pressurization system based on a partition tank, CN117627817A, Ding Lei). As a new tank structure, in order to improve the utilization rate of propellant, in addition to the traditional box bottom outflow, the propellant delivery outflow during the rocket's ascending flight phase needs to eliminate vortexes and prevent collapse. It is also necessary to consider the phenomenon that when the propellant flows through the partition, bubbles are generated in the lower box and enter the delivery pipe, causing air entrainment in the engine. For the partition outflow process, compared with the traditional outflow, it has the following characteristics:

[0003] 1) The spaces above and below the baffle are both large spaces with a diameter equal to the diameter of the rocket body, and the propellant flow rate does not change significantly after flowing through the outlet;

[0004] 2) Limited by the size of the isolation valve, the baffle generally has multiple outlets, and the installation of the isolation valve at the outlet makes the flow relatively complex;

[0005] 3) The purpose of the outflow of the partition is to prevent the gas from entering the bottom conveying pipe of the lower box. The air cushion gas and non-penetrating diffuse bubbles formed do not affect the outflow effect;

[0006] 4) Regardless of the shutdown time (when the engine is shut down, there is no propellant in the main tank and some propellant in the partition tank), the outflow from the partition must go through three stages: collapse and air entrainment due to a higher liquid level, air entrainment due to two-phase flow when the liquid level passes the outlet, and air entrainment due to the "waterfall effect" of the center outlet caused by the liquid level difference.

[0007] Based on the above characteristics, traditional vortex elimination and anti-collapse devices (1. An integrated vortex elimination and anti-collapse filtering device, CN111102099A, Sun Shanxiu; 2. A fuel tank vortex elimination and anti-collapse device, CN102953866A, Hu Dafeng) cannot be used for bubble suppression in the partition outflow process. It is necessary to design a partition tank outflow air inclusion suppression device to solve the problem of air inclusion in the partition tank outflow process. Summary of the invention

[0008] The technical problem solved by the present application is: to overcome the deficiency that the existing outflow device design technology is not applicable to the outflow design of the partition tank, and to provide a partition tank outflow air inclusion suppression device to solve the problem of propellant air inclusion caused by bubbles generated in the outflow of the partition tank of a reusable rocket.

[0009] The technical solutions provided by this application are as follows:

[0010] A reusable partition tank outflow air inclusion suppression device comprises a main tank, a partition tank, an isolation valve and a suppression assembly, wherein the main tank is connected to the top of the partition tank, the top of the partition tank is a partition, a plurality of isolation valves are arranged on the partition, and the suppression assembly is installed at the outlet of the isolation valve. After the propellant enters the suppression assembly from the isolation valve, the outflow direction from the suppression assembly is perpendicular to the outlet axis direction of the isolation valve.

[0011] The suppression assembly includes a connecting flange and an outflow screen. The inner cavity of the outflow screen is cylindrical. The connecting flange is connected to the open end of the outflow screen. The other end of the outflow screen is connected to a bottom plate. The outflow screen is provided with a plurality of outflow holes. The connecting flange is connected to the outlet end of the isolation valve so that all the propellant flowing out of the isolation valve enters the outflow screen.

[0012] The suppression assembly further comprises a guide cone, the large diameter end of the guide cone is connected to the bottom plate, and the tip of the guide cone is located on a side of the bottom plate facing the connecting flange.

[0013] The bottom plate is an annular structure, and the bottom plate is connected between the edge of the large diameter end of the guide cone and the end of the outflow screen.

[0014] The total area of ​​all the outflow holes is not less than 1.5 times the effective flow area of ​​the isolation valve.

[0015] The outlet axis of the isolation valve is perpendicular to the bottom plate.

[0016] The inner cavity of the outflow screen is cylindrical; or the inner cavity of the outflow screen is a truncated cone-shaped inner cavity, and the inner diameter of one end of the outflow screen connected to the bottom plate is larger than the inner diameter of one end of the outflow screen connected to the connecting flange.

[0017] When the suppression assembly is in the ascending working section, the isolation valve is in an open state.

[0018] In summary, this application at least includes the following beneficial technical effects:

[0019] By changing the propellant flow direction, the bubbles are changed from downward development to lateral movement, and then precipitated out of the liquid surface under the action of buoyancy. This device can suppress the collapse and air inclusion caused by the higher liquid level generated in the outflow process of the partition, the air inclusion of the two-phase flow when the liquid level passes the outlet, and the "waterfall effect" air inclusion caused by the liquid level difference in the center outlet. Through the circumferential balanced load design, a relatively simple structural device is used to solve the problem of propellant air inclusion caused by bubbles in the outflow of the reusable rocket partition tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 The system principle diagram and structural diagram of the working process of the device of this application;

[0021] Figure 2 Schematic diagram of the structure of the suppression component.

[0022] Description of the accompanying figures: 1. Main tank; 2. Bulkhead tank; 3. Isolation valve; 4. Suppression assembly; 5. Tank outflow device;

[0023] 41. Connecting flange; 42. Outflow screen; 43. Guide cone. DETAILED DESCRIPTION

[0024] In order to make the objectives, technical solutions and advantages of the present invention more clear, the embodiments disclosed in the present invention will be further described in detail below with reference to the accompanying drawings.

[0025] The present application discloses a device for suppressing air inclusion in outflow of a reusable partition tank, such as Figure 1 As shown, it includes a main tank 1, a partition tank 2, an isolation valve 3, a suppression assembly 4 and a tank outflow device 5. In this system, the main tank 1 is connected with the partition tank 2 through the isolation valve 3. The top of the partition tank 2 is a partition, and multiple isolation valves 3 are arranged on the partition. In this embodiment, an isolation valve 3 is arranged in the middle of the partition, and four isolation valves 3 are arranged around the isolation valve 3. The bottom outlet of the partition tank 2 is connected to the main delivery pipe, and the suppression assembly 4 is installed at the lower part of the outlet of the isolation valve 3. After the propellant flows through the partition tank 2, it enters the main delivery pipe through the tank outflow device 5, so as to realize the supply of propellant to the downstream.

[0026] See the schematic diagram of the suppression assembly for Figure 2 The suppression assembly 4 mainly includes a connecting flange 41, an outflow screen 42 and a guide cone 43. The outflow screen 42 is cylindrical, the connecting flange 41 is connected to the open end of the outflow screen 42, the other end of the outflow screen 42 is connected to a bottom plate, the outlet axis of the isolation valve 3 is perpendicular to the bottom plate, a plurality of outflow holes are arranged on the outflow screen 42, and the connecting flange 41 is connected to the outlet end of the isolation valve 3 so that all the propellant flowing out of the isolation valve 3 enters the outflow screen 42. The large diameter end of the guide cone 43 is connected to the bottom plate, the tip of the guide cone 43 is located on the side of the bottom plate facing the connecting flange 41, the bottom plate is an annular structure, and the bottom plate is connected between the large diameter end edge of the guide cone 43 and the end of the outflow screen 42.

[0027] The device is connected to the isolation valve 3 through a connecting flange 41, and the flange connection strength satisfies reliable connection under the action of fluid force; the guide cone 43 mainly reduces the flow resistance, and the flow direction of the propellant changes after passing through the guide cone 43, and the strength satisfies the pressure difference requirement between the inner and outer surfaces; the propellant finally enters the partition tank 2 through the outflow screen 42, and the outflow area is not less than 1.5 times the effective flow area of ​​the isolation valve 3.

[0028] The suppression component 4 works in the rising section, at which time the isolation valve 3 is in the open state. As the liquid level drops to before the shutdown of the rising section, the outflow process produces an air inclusion suppression effect in three stages:

[0029] 1) When the liquid level in the main tank 1 is low but the isolation valve 3 has not yet exposed the liquid surface, due to the outflow air inclusion caused by the vortex and the liquid level collapse, bubbles are generated and flow through the suppression component 4 with the liquid. After the direction changes to the horizontal direction, the bubbles float up and enter the partition tank 2 to form an air pillow;

[0030] 2) When the liquid level passes through the isolation valve 3, the outlet (the flow channel of the isolation valve 3 is the outlet) is a gas-liquid two-phase flow, and the gas and liquid are mixed and enter the partition tank 2. At the bottom of the suppression component 4, the gas floats up and enters the air pillow of the partition tank 2;

[0031] 3) As the liquid level difference between the upper and lower tanks increases, the outlet of the isolation valve 3 located in the middle of the partition leaves the liquid surface of the partition tank 2. At this time, if the outflowing propellant from the main tank 1 splashes directly into the partition tank 2, it will entrain the surrounding gas to produce a "waterfall effect" to form bubbles in the partition tank 2; after the suppression component 4 is set, the outflowing propellant from the main tank 1 passes through the bottom of the suppression component 4, and its outflow direction becomes horizontal. The initial longitudinal velocity of the propellant flowing out of the suppression component 4 starts from 0 and accelerates according to the acceleration of gravity, so that when it reaches the surface of the propellant in the partition tank 2, the speed is relatively small, and the gas and liquid are easier to separate. Even if gas enters the propellant in the partition tank 2, due to the relatively small speed, the same volume of propellant has a larger falling area on the propellant surface in the partition tank 2, so the gas entry depth is smaller, and the gas is easier to float and separate.

[0032] The contents not described in detail in this application specification belong to the common knowledge of those skilled in the art.

[0033] The present application is described in detail above in conjunction with specific implementation methods and exemplary examples, but these descriptions cannot be understood as limiting the present application. Those skilled in the art understand that, without departing from the spirit and scope of the present application, a variety of equivalent replacements, modifications or improvements can be made to the technical solution of the present application and its implementation methods, all of which fall within the scope of the present application. The scope of protection of the present application shall be subject to the attached claims.

Claims

1. A device for suppressing air inclusion in outflow of a reusable partition tank, characterized in that: The invention comprises a main tank (1), a partition tank (2), an isolation valve (3) and a suppression assembly (4); the main tank (1) is connected to the top of the partition tank (2); the top of the partition tank (2) is a partition, a plurality of isolation valves (3) are arranged on the partition, and the suppression assembly (4) is installed at the outlet of the isolation valve (3); after the propellant enters the suppression assembly (4) from the isolation valve (3), the outflow direction from the suppression assembly (4) is perpendicular to the outlet axis direction of the isolation valve (3).

2. The device for suppressing air inclusion in outflow of a reusable partition tank according to claim 1, characterized in that: The suppression assembly (4) comprises a connecting flange (41) and an outflow screen (42); the inner cavity of the outflow screen (42) is cylindrical; the connecting flange (41) is connected to the open end of the outflow screen (42); the other end of the outflow screen (42) is connected to a bottom plate; a plurality of outflow holes are provided on the outflow screen (42); the connecting flange (41) is connected to the outlet end of the isolation valve (3) so that all the propellant flowing out of the isolation valve (3) enters the outflow screen (42).

3. The device for suppressing air inclusion in outflow of a reusable partition tank according to claim 2, characterized in that: The suppression assembly (4) further comprises a guide cone (43), the large diameter end of the guide cone (43) is connected to the bottom plate, and the tip of the guide cone (43) is located on the side of the bottom plate facing the connecting flange (41).

4. The device for suppressing air inclusion in outflow of a reusable partition tank according to claim 3, characterized in that: The bottom plate is an annular structure, and is connected between the large-diameter end edge of the guide cone (43) and the end of the outflow screen (42).

5. The device for suppressing air inclusion in outflow of a reusable partition tank according to claim 2, characterized in that: The total area of ​​all the outflow holes is not less than 1.5 times the effective flow area of ​​the isolation valve (3).

6. The device for suppressing air inclusion in outflow of a reusable partition tank according to claim 2, characterized in that: The outlet axis of the isolation valve (3) is perpendicular to the bottom plate.

7. The device for suppressing air inclusion in outflow of a reusable partition tank according to claim 2, characterized in that: The inner cavity of the outflow screen (42) is cylindrical; or the inner cavity of the outflow screen (42) is a truncated cone-shaped inner cavity, and the inner diameter of one end of the outflow screen (42) connected to the bottom plate is larger than the inner diameter of one end of the outflow screen (42) connected to the connecting flange (41).

8. The device for suppressing air inclusion in outflow of a reusable partition tank according to claim 1, characterized in that: When the suppression component (4) is in the ascending working section, the isolation valve (3) is in an open state.

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