CN106439494B - A kind of asymmetric gas path module for dual mode satellite propulsion system - Google Patents
A kind of asymmetric gas path module for dual mode satellite propulsion system Download PDFInfo
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- CN106439494B CN106439494B CN201610822166.0A CN201610822166A CN106439494B CN 106439494 B CN106439494 B CN 106439494B CN 201610822166 A CN201610822166 A CN 201610822166A CN 106439494 B CN106439494 B CN 106439494B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D1/00—Pipe-line systems
- F17D1/02—Pipe-line systems for gases or vapours
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D3/00—Arrangements for supervising or controlling working operations
- F17D3/01—Arrangements for supervising or controlling working operations for controlling, signalling, or supervising the conveyance of a product
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Abstract
A kind of asymmetric gas path module for dual mode satellite propulsion system, including pressure reducer, oxygen road gas path module, gas test interface, combustion road gas path module；Pressure reducer receives upstream high gas, and by high pressure air reducing at pressure needed for downstream, and pressure reducer outlet is connected with oxygen road gas path module, gas test interface, combustion road gas path module entrance simultaneously；The gas path module outlet of oxygen road downstream supplies pressurization gas all the way；The outlet of combustion road gas path module downstream supplies pressurization gas all the way；Gas test interface egress externally provides test interface.The present invention adapts to the non-isometric discharge of dual mode satellite propulsion system oxygen combustion propellant and the inconsistent feature of the roads Yang Ran gas circuit working life demand, by introducing the small diaphragm type one-way valve of starting differential pressure, the configuration asymmetric gas circuit in the roads Yang Ran, solve the problems, such as dual mode satellite propulsion system due to oxygen combustion propellant it is non-it is isometric discharge the roads the system Yang Ran operating unbalance brought, and meet system combustion road gas circuit long-term in-orbit the needs of using.
Description
Technical field
The present invention relates to satellite propulsion systems, mainly for therein using anhydrous hydrazine and dinitrogen tetroxide as the double of propellant
Pattern propulsion system.
Background technology
Large-scale high rail satellite generally uses traditional bipropellant propulsion system.The propulsion system includes high pressure gas storage mould
Block, decompression gas path module, tank, liquid channel system, thruster.The system will be supplied by depressurizing gas path module after high pressure air reducing
It is given to tank, squeezes tank propellant, propellant feed to thruster is generated by thrust by liquid channel system.After satellier injection,
Tank no longer needs tonifying Qi, decompression gas path module to be isolated by electric blasting valve, do not use.Since the system uses methyl hydrazine and four
Nitrous oxide as propellant, it can be achieved that oxygen combustion propellant discharge in equal volume, therefore system decompression gas path module the roads Yang Ran gas
Body flow is identical, and simple symmetric design is that can guarantee the roads the Yang Ran drag balance of decompression gas path module.
In order to improve satellite propulsion system adaptability, integrated single group member pushes away on the basis of traditional bipropellant propulsion system
It is promoted into electric arc, forms dual mode propulsion system.The propulsion system is using anhydrous hydrazine and dinitrogen tetroxide as propellant, system
Oxygen fires no longer to discharge in equal volume.Non- isometric discharge of propellant will lead to the gas flow difference on the roads gas path module Yang Ran,
Therefore traditional simple symmetric gas path module is no longer applicable in.In addition, the system in-orbit period needs by the more of fuel tank
Secondary tonifying Qi avoids fuel tank hypotony, to influence Arcjet performance.Therefore, gas path module cannot after satellier injection
It is completely isolated, it needs to ensure the long-term in-orbit available of combustion road gas circuit.
In order to solve the problems, such as that conventional satellite decompression gas path module does not adapt to dual mode propulsion system use demand, need
Specific demand for dual mode propulsion system designs gas path module.
Invention content
Present invention solves the technical problem that being：A kind of asymmetric gas path module is provided, satellite double mode can be solved and pushed away
Into system due to propellant it is non-it is isometric discharge bring gas circuit flow resistance imbalance problem, combustion the in-orbit long-time service problem of road gas circuit
Deng meeting the use demand of satellite dual mode propulsion system.
Technical solution of the invention is：A kind of asymmetric gas path module for dual mode satellite propulsion system, packet
Include pressure reducer, oxygen road gas path module, first gas test interface, combustion road gas path module；Pressure reducer receives upstream high gas, and
By high pressure air reducing at pressure needed for downstream, pressure reducer outlet simultaneously with oxygen road gas path module, first gas test interface, combustion
Road gas path module three parts entrance is connected；The gas path module outlet of oxygen road downstream supplies pressurization gas all the way；Fire road gas path module
Outlet downstream supplies pressurization gas all the way；The outlet of first gas test interface externally provides test interface.
Oxygen road gas path module includes the normally opened electric blasting valve of the first low pressure, primary diaphragm formula check valve, secondary diaphragm formula list
Add valve to valve, second gas test interface, the normally closed electric blasting valve of the first high pressure, the normally closed electric blasting valve of the second high pressure, oxygen case；First is low
It presses normally opened electric detonation valve inlet as oxygen road gas path module entrance, receives the gas after pressure reducer decompression；The normally opened electric detonation of first low pressure
Valve, primary diaphragm formula check valve, secondary diaphragm formula check valve, the normally closed electric blasting valve of the first high pressure are sequentially connected in series by pipeline；
A bye-pass branch, which is separated, in secondary diaphragm formula one-way valved outlet connects second gas test interface；In the normally closed electric detonation of the first high pressure
Valve outlet, entrance respectively separate a bye-pass branch, are connected respectively the normally closed electric detonation valve outlet of the second high pressure, entrance, make second
The normally closed electric blasting valve of high pressure and the normally closed electric blasting valve of the first high pressure form parallel-connection structure；In the normally closed electric blasting valve of the second high pressure and the first high pressure
The parallel-connection structure export pipeline that normally closed electric blasting valve is formed separates two-way line branching, adds valve entrance to be connected with oxygen case all the way, separately
The outlet supply gas as oxygen road gas path module enters the progress tonifying Qi supercharging of oxygen tank all the way.
The combustion road gas path module includes that third diaphragm type one-way valve, third gas test interface, third high pressure are normally closed
Electric blasting valve, combustion gas road latching valve, the normally opened electric blasting valve of the second low pressure, combustion case add valve；Third diaphragm type one-way valve inlet is as combustion
Road gas path module entrance receives the gas after pressure reducer decompression；Third diaphragm type one-way valved outlet separates two-way pipeline, all the way with
Third gas test interface entrance is connected, and another way is connected with the normally closed electric blasting valve of third high pressure；The normally closed electric blasting valve of third high pressure goes out
Mouth, entrance respectively separate pipeline all the way and are connected respectively the outlet of combustion gas road latching valve, entrance, make combustion gas road latching valve and third
The normally closed electric blasting valve of high pressure forms parallel-connection structure；Go out in the parallel-connection structure that combustion gas road latching valve is formed with the normally closed electric blasting valve of third high pressure
Mouth pipeline separates two-way line branching, adds valve entrance to be connected with combustion case all the way, another way enters with the normally opened electric blasting valve of the second low pressure
Mouth is connected；The normally opened electric detonation valve outlet of second low pressure enters combustion tank as the outlet supply gas of combustion road gas path module and carries out tonifying Qi
Supercharging.
The advantages of the present invention over the prior art are that：
(1) present invention diaphragm type one-way valve small by introducing starting differential pressure, solves existing bipropellant propulsion system gas
Road module may differ by excessive problem due to the oxygen combustion tank tonifying Qi moment that check valve starting differential pressure is brought greatly；
(2) present invention solves the roads dual mode propulsion system Yang Ran gas circuit flow and differs by symmetrical arrangements check valve
Gas circuit differences in flow resistance excessive problem in the roads Yang Ran caused by causing.Existing symmetrical structure bipropellant propulsion system is promoted for double mode
System will cause the roads Yang Ran gas circuit differences in flow resistance excessive, and then gas path module is caused to be supplied to the gas pressure that downstream oxygen fires tank
Difference is bigger than normal, influences system worked well；
(3) present invention solves dual mode propulsion system and wants by firing the latching valve of road gas path module and adding valve configuration
The problem of roads Qiu Ran gas circuit in-orbit long-time service.Latching valve fires road gas circuit, the height in parallel with latching valve for open and close at any time
Backup of the normally closed electric blasting valve for not opening as latching valve, the normally opened electric blasting valve of low pressure in latching valve downstream is pressed to exist for latching valve
Gas circuit is cut off when rail failure leakage, it is ensured that downstream tank safety.
(4) present invention solves bimodulus by the way that gas circuit low pressure normally opened electric detonation valve position in oxygen road is advanceed to check valve upstream
Formula propulsion system is effectively isolated useless module after entering the orbit, the problem of improving system sealing reliability.Conventional satellite bipropellant propulsion
Gas circuit does not use after system is entered the orbit, and oxygen road gas path module is located at the normally closed electric blasting valve downstream of high pressure, for upstream gas circuit mould to be isolated
Block.Dual mode propulsion system enters the orbit the roads Hou Yang gas circuit and oxygen road fluid path does not use, by the normally opened electric blasting valve of oxygen road gas circuit low pressure
Position advances to check valve upstream, it can be ensured that entire oxygen road gas circuit and oxygen road fluid path is isolated.
(5) the present invention provides a kind of gas path module meeting dual mode propulsion system work requirements, traditional gas is solved
Road module can not adapt to the problem of dual mode propulsion system work characteristics.
Description of the drawings
Fig. 1 is a kind of asymmetric gas path module structure chart for dual mode satellite propulsion system of the invention；
Fig. 2 is oxygen road gas path module structure chart of the present invention；
Fig. 3 is present invention combustion road gas path module structure chart.
Specific implementation mode
For the specific demand of dual mode satellite propulsion system, the present invention proposes a kind of for dual mode satellite propulsion system
Asymmetric gas path module, the module can adapt to dual mode satellite propulsion system oxygen combustion propellant it is non-it is isometric discharge and oxygen combustion
The inconsistent two major features of road gas circuit working life demand, by introducing the small diaphragm type one-way valve of starting differential pressure, the roads configuration Yang Ran
The designs such as asymmetric gas circuit solve the system that dual mode satellite propulsion system is brought due to the non-isometric discharge of oxygen combustion propellant
The roads Yang Ran operating unbalance problem, and meet the long-term in-orbit demand used of system combustion road gas circuit.
A kind of asymmetric gas path module for dual mode satellite propulsion system includes pressure reducer, oxygen road gas path module, gas
Body test interface 1, combustion road gas path module.Pressure reducer is used for high pressure air reducing into pressure needed for downstream.Oxygen road gas path module
Gas after decompression is supplied to oxygen tank, while anti-block tank propellant steam swims infiltration, the roads Bing Yang work back up
Entire oxygen road is cut off after being fully completed.First gas test interface 3 is used to obtain pressure reducer outlet pressure when system testing.Combustion
Gas after decompression is supplied to combustion tank by road gas path module, is prevented combustion tank propellant steam from swimming infiltration back up, is ensured
Firing road gas circuit at any time can be to combustion tank tonifying Qi, while ensureing that firing road gas circuit occurs in time to be isolated when leakage failure, not under
Trip impacts.
Present system is described in detail below according to attached drawing.
A kind of asymmetric gas path module for dual mode satellite propulsion system is as shown in Figure 1, include：Pressure reducer 1, oxygen road
Gas path module 2, first gas test interface 3, combustion road gas path module 4.Pressure reducer 1 receive upstream high gas, outlet simultaneously with
Oxygen road gas path module 2, first gas test interface 3, combustion 4 three parts entrance of road gas path module are connected.Oxygen road gas path module 2 exports
Downstream supply pressurization gas all the way.Combustion road gas path module 4 downstream supplies pressurization gas all the way.First gas test interface 3
Outlet externally provides test interface.
(1) oxygen road gas path module
Oxygen road gas path module 2 is as shown in Figure 2.Normally opened 5 entrance of electric blasting valve of first low pressure is received as the module inlet and is depressurized
Gas after the decompression of device 1.The normally opened electric blasting valve 5 of first low pressure, primary diaphragm formula check valve 6, secondary diaphragm formula check valve 7, first
The normally closed electric blasting valve of high pressure 9 is sequentially connected in series by pipeline.A bye-pass branch is separated in the outlet of secondary diaphragm formula check valve 7 to connect
Connect gas test interface 8.A bye-pass branch, which is respectively separated, in normally closed 9 entrance of electric blasting valve of the first high pressure is separately connected the second high pressure
10 entrance of normally closed electric blasting valve makes the normally closed electric blasting valve 9 of normally closed 10 and first high pressure of electric blasting valve of the second high pressure form parallel-connection structure.
The parallel-connection structure export pipeline that the normally closed electric blasting valve 9 of normally closed 10 and first high pressure of electric blasting valve of second high pressure is formed separates two-way pipeline point
Branch, adds 11 entrance of valve to be connected, another way enters oxygen tank as the outlet supply gas of oxygen road gas path module 2 with oxygen case all the way
Carry out tonifying Qi supercharging.
Oxygen road gas path module 2 receives the gas after pressure reducer 1 depressurizes, and gas is input to downstream oxygen tank, is store to oxygen
Case carries out tonifying Qi supercharging.Oxygen road part of the normally opened electric blasting valve 5 of first low pressure for oxygen road gas path module and downstream does not use
The roads Shi Duiyang gas path module and oxygen road part downstream are isolated, and ensure that it no longer influences propulsion system other parts.The
One diaphragm type one-way valve 6 and secondary diaphragm formula check valve 7 are for preventing in the tank of downstream propellant steam inverse osmosis to gas circuit
Upstream.Gas test interface 8 is for being detected air-channel system.The normally closed 9 and second normally closed electricity of high pressure of electric blasting valve of first high pressure
Quick-fried valve 10 mutually backs up, and is provided commonly for isolation upstream gas and downstream tank before air-channel system enables, improves security of system.Oxygen
Case adds aerating deflation interface of the valve 11 as downstream oxygen tank.
Traditional satellite propulsion system gas path module uses common check valve, starting differential pressure 0.1MPa.Unlatching bigger than normal
When pressure difference makes system work, only the propellant expenditure of downstream tank to a certain extent, tank pressure decline it is more when check valve
It can open, gas path module can start to carry out tonifying Qi to tank.Conventional satellite bipropellant propulsion system oxygen fires propellant
Isometric consumption, constant speed reduces tank pressure simultaneously, therefore oxygen combustion tank can reach tonifying Qi state at the almost the same moment and open
Beginning tonifying Qi, it is smaller that whole process oxygen fires tank pressure gap.For dual mode propulsion system, propellant is non-disappears in equal volume for oxygen combustion
Consumption, oxygen combustion tank pressure drop rate is inconsistent before tonifying Qi, and two tanks reach check valve and open the time of required pressure not
Unanimously.Two tank pressure reductions increase to the time difference that check valve unlatching requires is met with the increase of air passage one-way valve starting differential pressure
Greatly.When the check valve starting differential pressure used in the gas path module is bigger than normal, the one tonifying Qi supercharging of oxygen combustion tank, another length will be caused
Time is not up to tonifying Qi pressurized state, and oxygen fires tank and larger pressure divergence for a long time occurs.The state seriously affects system stabilization
Work.
Using diaphragm type one-way valve, starting differential pressure is only for oxygen road of the present invention gas path module 2 and combustion road gas path module 4
0.025MPa, much smaller than the 0.1MPa of traditional check valve, when effectively preventing dual mode propulsion system oxygen combustion tank because of tonifying Qi
The larger pressure divergence of oxygen combustion tank long-time caused by having big difference at quarter.
Dual mode satellite propulsion system oxygen fires propellant expenditure volume ratio 0.7：1 or so, therefore, the gas circuit tonifying Qi of the roads Yang Ran
Flow is about 0.7：1.The module symmetry configuration of conventional satellite bipropellant propulsion system oxygen gas road, 0.7：1 gas flow will
Cause oxygen road gas circuit flow resistance small, combustion road gas circuit flow resistance is big, eventually leads to gas path module and is supplied to oxygen tank gas pressure height, supply
It is low to combustion tank gas pressure, cause system operating unbalance.
The present invention is using oxygen road gas path module and combustion road gas path module symmetrical arrangements.Under same traffic, the self-locking of combustion gas road
Valve flow resistance is much smaller than a diaphragm type one-way valve.Oxygen road of the present invention gas path module configures two diaphragm type one-way valves, fires road gas circuit
Module configures a diaphragm type one-way valve and a combustion gas road latching valve, and oxygen gas road module can be ensured in gas flow 0.7：
Under 1 state, oxygen gas road flow resistance is almost the same, meets system operation requirements.
The normally opened electric blasting valve of low pressure is set to oxygen gas road module outlet by conventional satellite bipropellant propulsion system gas path module,
When not used for air-channel system after satellier injection, entire gas path module is isolated, it is ensured that the sealing of propulsion system remainder
Reliability.
Dual mode satellite propulsion system is not used in satellier injection Hou Yang road gas path modules and entire oxygen road fluid path part,
It needs to be effectively isolated this two parts.The normally opened electric blasting valve of first low pressure 5 is set to oxygen road gas circuit entrance by the present invention, can ensure to defend
Farthest isolation from oxygen road gas path module and oxygen road fluid path part after star is entered the orbit.
2 combustion road gas path modules
It is as shown in Figure 3 to fire road gas path module 4.12 entrance of third diaphragm type one-way valve receives pressure reducer as the module inlet
Gas after 1 decompression.Third diaphragm type one-way valve 12 outlet separate two-way pipeline, all the way with 13 entrance of third gas test interface
It is connected, the normally closed electric blasting valve of another way and third high pressure 15 is connected.Normally closed 15 entrance of electric blasting valve of third high pressure respectively separates manages all the way
Road is separately connected the entrance of combustion gas road latching valve 14, and combustion gas road latching valve 14 is made to be formed simultaneously with the normally closed electric blasting valve 15 of third high pressure
It is coupled structure.The parallel-connection structure export pipeline that latching valve 14 is formed with the normally closed electric blasting valve 15 of third high pressure on combustion gas road separates two-way pipe
Road branch adds 17 entrance of valve to be connected with combustion case all the way, and another way is connected with normally opened 16 entrance of electric blasting valve of the second low pressure.Second is low
It presses the outlet of normally opened electric blasting valve 16 to enter combustion tank as the outlet supply gas of combustion road gas path module 4 and carries out tonifying Qi supercharging.
It fires road gas path module 4 and receives the gas after pressure reducer 1 depressurizes, and gas is input to downstream and fires tank, combustion is store
Case carries out tonifying Qi supercharging.Third diaphragm type one-way valve 12 is for preventing in the tank of downstream propellant steam inverse osmosis to gas circuit
Trip.Third gas test interface 13 is for being detected air-channel system.Combustion gas road latching valve 14 exists as combustion road gas path module
Rail carries out combustion tank one of switch valve of tonifying Qi supercharging.The normally closed electric blasting valve 15 of third high pressure is beaten as combustion gas road latching valve 14
The backup of failure is not opened.Gas circuit is isolated when breaking down for gas circuit in second low pressure normally opened electric blasting valve 16, avoids influencing to promote system
System downstream normal work.Combustion case adds valve 17 as the aerating deflation interface of downstream combustion tank.
The content that description in the present invention is not described in detail belongs to the known technology of those skilled in the art.
Claims (2)
1. a kind of asymmetric gas path module for dual mode satellite propulsion system, it is characterised in that：Including pressure reducer (1), oxygen
Road gas path module (2), first gas test interface (3), combustion road gas path module (4)；Pressure reducer (1) receives upstream high gas,
And by high pressure air reducing at pressure needed for downstream, pressure reducer (1) outlet is tried with oxygen road gas path module (2), first gas simultaneously
Test interface (3), combustion road gas path module (4) three parts entrance is connected；Oxygen road gas path module (2) outlet downstream supplies to be pressurized all the way
Gas；Combustion road gas path module (4) exports and downstream supplies pressurization gas all the way；First gas test interface (3) outlet externally carries
For test interface；The combustion road gas path module (4) includes third diaphragm type one-way valve (12), third gas test interface
(13), the normally closed electric blasting valve of third high pressure (15), combustion gas road latching valve (14), the normally opened electric blasting valve of the second low pressure (16), combustion case add row
Valve (17)；Third diaphragm type one-way valve (12) entrance is as combustion road gas path module (4) entrance, after receiving pressure reducer (1) decompression
Gas；Third diaphragm type one-way valve (12) outlet separates two-way pipeline, is connected all the way with third gas test interface (13) entrance,
Another way is connected with the normally closed electric blasting valve of third high pressure (15)；The normally closed electric blasting valve of third high pressure (15) outlet, entrance respectively separate all the way
Pipeline is connected respectively the outlet of combustion gas road latching valve (14), entrance, keeps combustion gas road latching valve (14) and third high pressure normally closed
Electric blasting valve (15) forms parallel-connection structure；Combustion gas road latching valve (14) formed with the normally closed electric blasting valve of third high pressure (15) and be coupled
Structure export pipeline separates two-way line branching, adds valve (17) entrance to be connected with combustion case all the way, another way and the second low pressure are normally opened
Electric blasting valve (16) entrance is connected；The normally opened electric blasting valve of second low pressure (16) outlet supplies gas as the outlet of combustion road gas path module (4)
Body enters combustion tank and carries out tonifying Qi supercharging.
2. a kind of asymmetric gas path module for dual mode satellite propulsion system according to claim 1, feature exist
In：Oxygen road gas path module (2) includes the normally opened electric blasting valve of the first low pressure (5), primary diaphragm formula check valve (6), secondary diaphragm
Formula check valve (7), second gas test interface (8), the normally closed electric blasting valve of the first high pressure (9), the normally closed electric blasting valve of the second high pressure (10),
Oxygen case adds valve (11)；The normally opened electric blasting valve of first low pressure (5) entrance receives pressure reducer (1) as oxygen road gas path module (2) entrance
Gas after decompression；The normally opened electric blasting valve of first low pressure (5), primary diaphragm formula check valve (6), secondary diaphragm formula check valve (7),
The normally closed electric blasting valve of one high pressure (9) is sequentially connected in series by pipeline；A bye-pass is separated in secondary diaphragm formula check valve (7) outlet
Branch connects second gas test interface (8)；A bye-pass point is respectively separated in the normally closed electric blasting valve of the first high pressure (9) outlet, entrance
Branch is connected respectively the normally closed electric blasting valve of the second high pressure (10) outlet, entrance, makes the normally closed electric blasting valve of the second high pressure (10) and first
The normally closed electric blasting valve of high pressure (9) forms parallel-connection structure；In the normally closed electric blasting valve of the second high pressure (10) and the normally closed electric blasting valve of the first high pressure (9)
The parallel-connection structure export pipeline of formation separates two-way line branching, and valve (11) entrance is added to be connected with oxygen case all the way, and another way is made
Enter the progress tonifying Qi supercharging of oxygen tank for the outlet supply gas of oxygen road gas path module (2).
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| CN108708801A (en) * | 2018-06-01 | 2018-10-26 | 上海空间推进研究所 | The novel Propellant Management scheme of space propulsion system |
| CN109515759B (en) * | 2018-11-15 | 2020-11-10 | 中国空间技术研究院 | Static orbit communication satellite propulsion system with optimized manufacturability |
| CN111911808B (en) * | 2020-06-16 | 2022-05-10 | 西安航天动力研究所 | Integrated pressure reducing device |
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| US6488237B1 (en) * | 2001-09-28 | 2002-12-03 | The Boeing Company | Propellant cross-feed system and method |
| CN102926889A (en) * | 2012-10-31 | 2013-02-13 | 北京控制工程研究所 | Method for using bipropellants efficiently |
| CN103213692A (en) * | 2013-04-09 | 2013-07-24 | 北京控制工程研究所 | Method of actively adjusting balanced discharging of parallel connection tanks of satellite two component propelling system |
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| US6488237B1 (en) * | 2001-09-28 | 2002-12-03 | The Boeing Company | Propellant cross-feed system and method |
| CN106134390B (en) * | 2012-06-18 | 2014-10-22 | 上海空间推进研究所 | A kind of implementation method of space propulsion system |
| CN102926889A (en) * | 2012-10-31 | 2013-02-13 | 北京控制工程研究所 | Method for using bipropellants efficiently |
| CN103213692A (en) * | 2013-04-09 | 2013-07-24 | 北京控制工程研究所 | Method of actively adjusting balanced discharging of parallel connection tanks of satellite two component propelling system |
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