阅读说明：本技术 一种削能减振的液体火箭推进剂管路间交叉输送系统 (Cut-energy vibration-damping liquid rocket propellant intercircuit cross conveying system ) 是由 李翠 程亦薇 武定航 厉彦忠 于 2021-07-30 设计创作，主要内容包括：一种削能减振的液体火箭推进剂管路间交叉输送系统,包括第一助推级贮箱、第二助推级贮箱和芯级贮箱；第一助推级贮箱出口与第一助推级发动机连接；第二助推级贮箱出口与第二助推级发动机连接；芯级贮箱出口与第一芯级发动机、第二芯级发动机连接；第一助推级贮箱出口通过交叉路隔离阀、第一缓冲罐和第一芯级发动机连接；第二助推级贮箱出口通过交叉路隔离阀、第二缓冲罐和第二芯级发动机连接；交叉输送过程中,助推级贮箱先向缓冲罐供应推进剂,再由缓冲罐向芯级发动机供应推进剂,等助推级脱落之后再由芯级贮箱向芯级发动机供应推进剂；本发明缓冲罐的消能作用不受隔离阀类型限制,在造成最大水击强度的快开阀应用时也可起到良好的缓冲效果。(A cut-energy and vibration-damping cross conveying system between liquid rocket propellant pipelines comprises a first boosting stage storage tank, a second boosting stage storage tank and a core stage storage tank; the outlet of the first boosting stage storage tank is connected with a first boosting stage engine; the outlet of the second boosting stage storage tank is connected with a second boosting stage engine; the outlet of the core-stage storage tank is connected with the first core-stage engine and the second core-stage engine; the outlet of the first boosting stage storage tank is connected with the first core stage engine through a cross path isolation valve and a first buffer tank; the outlet of the second boosting stage storage tank is connected with the second core stage engine through a cross path isolation valve and a second buffer tank; in the cross conveying process, the boosting stage storage box supplies propellant to the buffer tank, then supplies propellant to the core-level engine through the buffer tank, and supplies propellant to the core-level engine through the core-level storage box after the boosting stage falls off; the energy dissipation function of the buffer tank is not limited by the type of the isolation valve, and the buffer tank can play a good buffer effect when the quick-opening valve with the maximum water hammer strength is applied.)

1. A cut can damping liquid rocket propellant intercircuit cross conveying system which characterized in that: comprises a first boosting stage storage tank (1), a second boosting stage storage tank (2) and a core stage storage tank (3); the outlet of the first boosting stage storage tank (1) is connected with a first boosting stage engine (14) through a first pre-pump valve (10); the outlet of the second boosting stage storage tank (2) is connected with a second boosting stage engine (17) through a second pre-pump valve (13); an outlet of the core-grade storage tank (3) is connected with a first core-grade engine (15) through a third pump front valve (11); the outlet of the core-grade storage tank (3) is connected with a second core-grade engine (16) through a fourth pre-pump valve (12);

an outlet of the first boosting stage storage tank (1) is communicated with a pipeline through inlets of a first cross path isolation valve (4), a second cross path isolation valve (5), a first buffer tank (6), a third pump front valve (11) and a fourth pump front valve (12);

the outlet of the second boosting stage storage tank (2) is communicated with the inlet of a third pump front valve (11) and a fourth pump front valve (12) through a third cross path isolation valve (7), a fourth cross path isolation valve (8), a second buffer tank (9) and a third pump front valve (11);

in the cross conveying process, the boosting stage storage tank supplies propellant to the buffer tank, then the buffer tank supplies propellant to the core-level engine, and after the boosting stage falls off, the core-level storage tank supplies propellant to the core-level engine.

2. A cut can damping liquid rocket propellant intercircuit cross conveying system which characterized in that: comprises a first boosting stage storage tank (1), a second boosting stage storage tank (2) and a core stage storage tank (3); the outlet of the first boosting stage storage tank (1) is connected with a first boosting stage engine (14) through a first pre-pump valve (10); the outlet of the second boosting stage storage tank (2) is connected with a second boosting stage engine (17) through a second pre-pump valve (13); an outlet of the core-stage storage tank (3) is connected with a first core-stage engine (15) through a first buffer tank (6) and a third pump front valve (11); an outlet of the core-grade storage tank (3) is connected with a second core-grade engine (16) through a second buffer tank (9) and a fourth pre-pump valve (12);

an outlet of the first boosting stage storage tank (1) is communicated with inlets of the first buffer tank (6) and the second buffer tank (9) through a first cross path isolation valve (4) and a second cross path isolation valve (5) through pipelines;

the outlet of the second boosting stage storage tank (2) is communicated with the inlets of the first buffer tank (6) and the second buffer tank (9) through a third cross path isolation valve (7) and a fourth cross path isolation valve (8);

in the cross conveying process, the boosting stage storage tank supplies propellant to the buffer tank, then the buffer tank supplies propellant to the core-level engine, and after the boosting stage falls off, the core-level storage tank supplies propellant to the core-level engine.

Technical Field

The invention relates to the technical field of cross conveying of propellant supply systems, in particular to a cut energy and vibration reduction cross conveying system between liquid rocket propellant pipelines.

Background

With the extensive application of heavy-duty launch vehicles, reusable vehicles, space shuttles and other aircraft, the cross-feed technology has received much attention as a new propellant supply system. The propellant cross conveying technology is a technology for realizing propellant sharing between each stage of storage tank and an engine thereof through a cross conveying pipeline between a boosting stage and a core stage. By the technology, the booster or the next-stage storage tank can supply propellant to the core-stage or previous-stage engine while working, so that the latter consumes little or no original propellant, thereby greatly improving the carrying capacity of the rocket, optimizing the overall layout of the rocket body, reducing the takeoff-thrust-weight ratio and improving the economy and safety of the rocket.

Common systems of cross-feed technology are cross-feed between tanks and cross-feed between pipes. The design of the storage tank pressurization system and the air pillow control system thereof for cross conveying among the storage tanks is a great challenge and is difficult to realize. The cross conveying between pipelines can be realized only by opening and closing a valve, and the cross conveying system with the simplest structure and realization mode is widely researched by domestic scholars.

In the cross conveying process, the boosting stage storage box directly conveys the propellant to the front of all engines including the core-stage engine by using a cross conveying pipeline, so that no or little outflow of the core-stage storage box is ensured; when the cross conveying is finished, the cross valve is closed, the boosting stage falls off, the propellant supply source of the core-level engine is converted from the boosting stage storage tank to the core-level storage tank, so that the flow rate of the propellant supply source fluctuates, and meanwhile, the pressure oscillation phenomenon occurs in the whole system due to the valve action. The system also has requirements on the type of the valve, and when a quick-opening valve is adopted as a cross-path isolating valve, cavitation can occur in the system, and the combustion characteristic of the core-level engine is seriously influenced.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention aims to provide a liquid rocket propellant intercircuit cross conveying system capable of reducing vibration, the energy dissipation effect of a buffer tank is not limited by the type of an isolation valve, and a good buffering effect can be achieved when a quick-opening valve causing the maximum water hammer strength is applied.

In order to achieve the purpose, the invention adopts the technical scheme that:

a cut-energy and vibration-damping crossed conveying system among liquid rocket propellant pipelines comprises a first boosting stage storage tank 1, a second boosting stage storage tank 2 and a core stage storage tank 3; the outlet of the first boosting stage storage tank 1 is connected with a first boosting stage engine 14 through a first pre-pump valve 10; the outlet of the second boosting stage storage tank 2 is connected with a second boosting stage engine 17 through a second pre-pump valve 13; the outlet of the core stage storage tank 3 is connected with a first core stage engine 15 through a third pre-pump valve 11; the outlet of the core-stage storage tank 3 is connected with a second core-stage engine 16 through a fourth pre-pump valve 12;

the outlet of the first boosting stage storage tank 1 is connected with the inlet of a third pre-pump valve 11 and a fourth pre-pump valve 12 through a first cross-path isolation valve 4, a second cross-path isolation valve 5 and a first buffer tank 6;

the outlet of the second boosting stage storage tank 2 is connected with the inlet of a third pre-pump valve 11 and a fourth pre-pump valve 12 through a third cross-path isolation valve 7, a fourth cross-path isolation valve 8 and a second buffer tank 9;

in the cross conveying process, the boosting stage storage tank supplies propellant to the buffer tank, then the buffer tank supplies propellant to the core-level engine, and after the boosting stage falls off, the core-level storage tank supplies propellant to the core-level engine.

A cut-energy and vibration-damping crossed conveying system among liquid rocket propellant pipelines comprises a first boosting stage storage tank 1, a second boosting stage storage tank 2 and a core stage storage tank 3; the outlet of the first boosting stage storage tank 1 is connected with a first boosting stage engine 14 through a first pre-pump valve 10; the outlet of the second boosting stage storage tank 2 is connected with a second boosting stage engine 17 through a second pre-pump valve 13; an outlet of the core-grade storage tank 3 is connected with a first core-grade engine 15 through a first buffer tank 6 and a third pump front valve 11; the outlet of the core-grade storage tank 3 is connected with a second core-grade engine 16 through a second buffer tank 9 and a fourth pre-pump valve 12;

the outlet of the first boosting stage storage tank 1 is communicated with the inlets of a first buffer tank 6 and a second buffer tank 9 through a first cross path isolation valve 4 and a second cross path isolation valve 5;

the outlet of the second boosting stage storage tank 2 is communicated with the inlets of the first buffer tank 6 and the second buffer tank 9 through a third cross path isolation valve 7 and a fourth cross path isolation valve 8;

in the cross conveying process, the boosting stage storage tank supplies propellant to the buffer tank, then the buffer tank supplies propellant to the core-level engine, and after the boosting stage falls off, the core-level storage tank supplies propellant to the core-level engine.

The invention has the beneficial effects that:

the first buffer tank 6 and the second buffer tank 9 can play an obvious role in buffering pressure fluctuation caused by actions of the first cross-path isolation valve 4, the second cross-path isolation valve 5, the third cross-path isolation valve 7 and the fourth cross-path isolation valve 8 during cross conveying boosting stage separation among pipelines, and absorb water hammer oscillation energy generated by closing of the first cross-path isolation valve, the second cross-path isolation valve and the third cross-path isolation valve. At the end of the cross-over delivery, the propellant sources of the first core engine 15 and the second core engine 16 are the first buffer tank 6 and the second buffer tank 9 all the time, so the propellant flow can be kept stable all the time. The buffer function of the buffer tank is not limited by the type of the isolation valve, and the buffer tank can play a good energy dissipation effect when the quick-opening valve with the maximum water hammer strength is applied.

Drawings

Fig. 1 is a schematic structural view of embodiment 1 of the present invention.

Fig. 2 is a schematic structural diagram of embodiment 2 of the present invention.

Fig. 3 is a graph comparing pressures at the inlet of the third pre-pump valve 11 and the fourth pre-pump valve 12 for different buffer tank volumes.

FIG. 4 is a graph comparing core level flow ripple for a prior art system and the present invention using a surge tank.

Detailed Description

The invention is described in detail below with reference to the figures and examples.

Example 1: as shown in figure 1, the cross conveying system between liquid rocket propellant pipelines capable of reducing energy and vibration comprises a first boosting stage tank 1, a second boosting stage tank 2 and a core stage tank 3; an outlet of the first boosting stage storage tank 1 is connected with a first boosting stage engine 14 through a first pre-pump valve 10 to form a left boosting stage branch; the outlet of the second boosting stage storage tank 2 is connected with a second boosting stage engine 17 through a second pump front valve 13 to form a right boosting stage branch; the outlet of the core stage storage tank 3 is connected with a first core stage engine 15 through a third pump front valve 11 to form a first core stage branch; the outlet of the core-stage storage tank 3 is connected with a second core-stage engine 16 through a fourth pre-pump valve 12 to form a second core-stage branch;

the outlet of the first boosting stage storage tank 1 is connected with the inlet communication pipeline of a first cross path isolation valve 4, a second cross path isolation valve 5, a first buffer tank 6, a third pre-pump valve 11 and a fourth pre-pump valve 12, and the first cross path isolation valve 4, the second cross path isolation valve 5 and the first buffer tank 6 form a left cross conveying branch;

the outlet of the second boosting stage storage tank 2 is connected with the inlet communication pipeline of a third cross path isolation valve 7, a fourth cross path isolation valve 8, a second buffer tank 9, a third pre-pump valve 11 and a fourth pre-pump valve 12, and the third cross path isolation valve 7, the fourth cross path isolation valve 8 and the second buffer tank 9 form a right cross conveying branch;

in the cross conveying process, the boosting stage storage tank supplies propellant to the buffer tank, then the buffer tank supplies propellant to the core-level engine, and after the boosting stage falls off, the core-level storage tank supplies propellant to the core-level engine.

The working principle of the embodiment 1 is as follows: during the cross-over delivery, the first booster stage tank 1 delivers propellant to the first booster stage motor 14 while filling the first buffer tank 6 with propellant, and the second booster stage tank 2 delivers propellant to the second booster stage motor 17 while filling the second buffer tank 9 with propellant; the air pillow pressure difference among the first boosting stage storage tank 1, the second boosting stage storage tank 2 and the core stage storage tank 3 enables the core stage storage tank 3 not to flow out, and the propellants of the first core stage engine 15 and the second core stage engine 16 are respectively sourced from the first buffer tank 6 and the second buffer tank 9; when the cross feed is completed, the first pre-pump valve 10, the second pre-pump valve 13, the first cross isolation valve 4, the second cross isolation valve 5, the third cross isolation valve 7, and the fourth cross isolation valve 8 are closed, the assist stage is disengaged, the core stage tank 3 is switched to supply the propellant to the first core stage engine 15 and the second core stage engine 16, and the third pre-pump valve 11 and the fourth pre-pump valve 12 are closed after the core stage tank 3 is completely supplied with the propellant.

Example 2: as shown in fig. 2, the cross conveying system between liquid rocket propellant pipelines capable of reducing energy and vibration comprises a first boosting stage tank 1, a second boosting stage tank 2 and a core stage tank 3; an outlet of the first boosting stage storage tank 1 is connected with a first boosting stage engine 14 through a first pre-pump valve 10 to form a left boosting stage branch; the outlet of the second boosting stage storage tank 2 is connected with a second boosting stage engine 17 through a second pump front valve 13 to form a right boosting stage branch; an outlet of the core-stage storage tank 3 is connected with a first core-stage engine 15 through a first buffer tank 6 and a third pump front valve 11 to form a first core-stage branch; the outlet of the core-grade storage tank 3 is connected with a second core-grade engine 16 through a second buffer tank 9 and a fourth pre-pump valve 12 to form a second core-grade branch;

an outlet of the first boosting stage storage tank 1 is communicated with inlets of a first buffer tank 6 and a second buffer tank 9 through a first cross path isolation valve 4 and a second cross path isolation valve 5 through pipelines, and the first cross path isolation valve 4 and the second cross path isolation valve 5 form a left cross conveying branch;

the outlet of the second boosting stage storage tank 2 is communicated with the inlets of the first buffer tank 6 and the second buffer tank 9 through a third cross-way isolation valve 7 and a fourth cross-way isolation valve 8 by pipelines, and the third cross-way isolation valve 7 and the fourth cross-way isolation valve 8 form a right cross conveying branch;

in the cross conveying process, the boosting stage storage tank supplies propellant to the buffer tank, then the buffer tank supplies propellant to the core-level engine, and after the boosting stage falls off, the core-level storage tank supplies propellant to the core-level engine.

The working principle of the embodiment 2 is as follows: during the cross-over delivery, the first booster stage tank 1 delivers propellant to the first booster stage motor 14 while filling the first buffer tank 6 with propellant, and the second booster stage tank 2 delivers propellant to the second booster stage motor 17 while filling the second buffer tank 9 with propellant; the air pillow pressure difference among the first boosting stage storage tank 1, the second boosting stage storage tank 2 and the core stage storage tank 3 enables the core stage storage tank 3 not to flow out, and the propellants of the first core stage engine 15 and the second core stage engine 16 are respectively sourced from the first buffer tank 6 and the second buffer tank 9; when the cross feed is completed, the first pre-pump valve 10, the second pre-pump valve 13, the first cross isolation valve 4, the second cross isolation valve 5, the third cross isolation valve 7, and the fourth cross isolation valve 8 are closed, the assist stage is disengaged, the core stage tank 3 is switched to supply the propellant to the first buffer tank 6, the first buffer tank 6 supplies the propellant to the first core engine 15, the core stage tank 3 supplies the propellant to the second buffer tank 9, the second buffer tank 9 supplies the propellant to the second core engine 16, and the third pre-pump valve 11 and the fourth pre-pump valve 12 are closed after the core stage tank 3 finishes supplying the propellant.

Both of examples 1 and 2 have an energy-dissipating and vibration-damping effect on the pressure fluctuation at the end of the cross feed. The buffering effect of different buffer tank volumes on core-level pressure fluctuation is shown in fig. 3, and the core-level pressure fluctuation is smaller and smaller as the buffer tank volume is increased. The volume of the buffer tank is 0.1m³When the pressure is reduced to a lower value, the pressure is slowly increased to a stable pressure, but multiple oscillations do not occur; the volume of the buffer tank is 0.5m³The core-level pressure oscillation disappears, the boosting-level liquid supply pressure is slowly transited to the core-level liquid supply pressure, and the larger the volume of the buffer tank is, the more slowly the core-level pressure is transited.

When the quick-opening valve is used as a cross path isolation valve, huge water hammer strength can be generated in a cross conveying system, even cavitation is generated on the core-level side of a cross path, so that core-level flow is discontinuous, and an obvious energy dissipation and vibration reduction effect can be achieved by adopting the buffer tank. The core-level flow fluctuation rate when the quick-open valve was used and the buffer tank was used was as shown in fig. 4, and the flow fluctuation rate reached 25% when the quick-open valve was used and was only 0.02% after the buffer tank was used.

The present invention has been described with reference to the above embodiments, and the structure, arrangement, and connection of the components may be changed, and on the basis of the solution of the present invention, the modification and equivalent changes of the individual components according to the principle of the present invention should not be excluded from the scope of the present invention.