CN108387378B - A kind of engine test Propellant Supply low frequency pulsating suppressing method and system - Google Patents
A kind of engine test Propellant Supply low frequency pulsating suppressing method and system Download PDFInfo
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- CN108387378B CN108387378B CN201810059091.4A CN201810059091A CN108387378B CN 108387378 B CN108387378 B CN 108387378B CN 201810059091 A CN201810059091 A CN 201810059091A CN 108387378 B CN108387378 B CN 108387378B
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Abstract
The present invention relates to a kind of engine test Propellant Supply low frequency pulsating suppressing method and systems, accurate helium injection is carried out using to Propellant Supply pipeline, change the intrinsic frequency of propellant feed system by the blending of gas, and by injected gas volume, gas distribution, the accurate control of injection gas form, reach and itself pulsation of propellant is adjusted, reduces the case where propellant feed system is coupled with engine.By the application of such method, the pulsation of Propellant Supply is reduced, improves Propellant Supply stability, and then improve the stability of entire engine pump system.This method and system are applied in engine test.
Description
Technical field
The present invention relates to a kind of engine test Propellant Supply low frequency pulsating suppressing method and systems.
Background technique
In Test System for Rocket Engine Test, due to the high speed rotation of turbine pump, cause to exist more in Propellant Supply pipeline
Serious pressure and flow pulsation.Pulsation interference reduces the stability of engine operation, and when pulsation and supply system
When other component frequency is close, it may occur that covibration influences the stability of entire pilot system.Existing conventional method is to make
It is adjusted with accumulator, such method weight of equipment is big, and regulating effect is undesirable.
Summary of the invention
In order to reduce the pressure and flow pulsation of propellant feed system, Propellant Supply stability is improved, and then improve
The stability of entire engine pump system, the present invention provides a kind of engine test Propellant Supply low frequency pulsating inhibition sides
It is low to provide a kind of simple engine test Propellant Supply of structure simultaneously according to the analog simulation calculated result of this method for method
Frequency pulsation inhibition system.Accurate helium injection is carried out using to Propellant Supply pipeline, is pushed away by the blending change of gas
Into the intrinsic frequency of agent supply system, and by reaching to injected gas volume, gas distribution, the accurate control of injection gas form
Itself pulsation of propellant is adjusted, the case where propellant feed system is coupled with engine is reduced.
Since the cavitation allowance that engine turbine pump has will not be to engine in the case where form tolerance is controllable
Work impacts.By the application of such method, the pulsation of Propellant Supply is reduced, improves Propellant Supply stability, into
And improve the stability of entire engine pump system.This method and system are applied in engine test.
The technical solution of the invention is as follows provides a kind of engine test Propellant Supply low frequency pulsating suppressing method, packet
Include following steps:
Step 1: helium bubble flow confirmation；
Injection is controlled to adjust by the flow of helium in control injection propellant according to Single bubble dynamic analysis method
The average diameter of helium bubble in propellant guarantees that injection bubble size is less than critical radius；With reference to Single bubble critical radius
Calculation formula:
ρ in formulal、ρgIt is the density of liquid and injection helium respectively；ugBe inject helium superficial velocity (superficial velocity is i.e.
The specific speed individually flowed through for phase a certain in Multiphase Flow)；
Step 2: referred to by the distribution device that high-speed camera gas distributed test combination simulation analysis is established under gas flow
Guided mode type；
2.1, it is emulated by the air flow method situation under the different open-cellular forms to distribution device, according to simulation result
Optimize distribution device, reach bubble and be uniformly distributed, it is ensured that helium will not be gathered into larger bubbles before entering engine；
2.2, it establishes and supplies pilot system comprising fluid, bubble distribution visualizes transparent pipeline, high-speed photography monitoring system
Bubble distribution pilot system；
2.3, it is flowed out, is uniformly distributed from the distribution device after step 2.1 optimization by high-speed photography acquisition helium bubble
Into fluid, the High Speed Photography Images of bubble distribution situation and bubble redistribution in flow process；In conjunction with image and gas
Bubble distribution situation compares and analyzes, and obtains reliable bubble distribution simulation model；
2.4, the reliable bubble distribution Building of Simulation Model obtained by step 2.3 corrects distribution device；Obtain helium
Distribution device guidance model needed for injection.
The present invention also provides a kind of engine test Propellant Supply low frequency pulsatings to inhibit system, is characterized in that
Including helium supply air distribution system, constant volume flow gas injected system and the quadrangle tangential circle gas distribution set gradually along helium flow direction
Device；
Above-mentioned helium supply air distribution system includes helium tank, gas collecting tube, liquid oxygen air distribution system and kerosene air distribution system；
The outlet of above-mentioned helium tank is accessed in gas collecting tube by shut-off valve, filter and helium escape pipe；
Above-mentioned liquid oxygen air distribution system and kerosene air distribution system include the mass flowmenter being arranged on helium escape pipe, cut
Only valve, pressure reducer, the first solenoid valve and velocity of sound orifice plate；
The entrance of liquid oxygen air distribution system and the filter in kerosene air distribution system is connected to gas collecting tube；
Above-mentioned constant volume flow gas injected system includes liquid oxygen constant volume flow gas injected system and kerosene constant volume
Flow gas injected system, above-mentioned liquid oxygen constant volume flow gas injected system pass through with the velocity of sound orifice plate in liquid oxygen air distribution system
The connection of helium escape pipe；Velocity of sound orifice plate in above-mentioned kerosene constant volume flow gas injected system and kerosene air distribution system passes through helium
The connection of gas escape pipe；
Above-mentioned liquid oxygen constant volume flow gas injected system includes equal streams with kerosene constant volume flow gas injected system
Hinder live calibrated in situ flow measurement device and along helium flow direction be successively set on helium outlet pipe etc. flow resistances flowmeter
Replacement device, power interface U-shaped compensation pipe, steady gas equalizing distributor；
Above-mentioned scene calibrated in situ flow measurement device includes mass flowmenter, for calibrating helium gas flow in situ；
The flow resistances flowmeter replacement device such as above-mentioned is for after calibration, replacing mass flowmenter and according to mass flowmenter
Characteristic adjusts flow resistance；
Above-mentioned power interface U-shaped compensation pipe is for carrying out the compensation of power boundary and reducing the variation of flow behavior；
Above-mentioned steady gas equalizing distributor is used to inhibit the pressure fluctuation of gas injection starting section；
Above-mentioned quadrangle tangential circle distribution device is used to control distributional pattern and distribution density after gas injection；It cuts above-mentioned quadrangle
Justify the gas injection ring that distribution device includes tube body and is circumferentially arranged along inboard wall of tube body, above-mentioned gas injection ring and inboard wall of tube body formation one are close
The toroidal cavity closed；
Multiple ventholes are provided on above-mentioned gas injection ring；
At least one the mitered tube opening being connected to toroidal cavity is offered in above-mentioned tubular body；It further include being set to outside tube body
Wall and it is located at inclined pipe opening and the inclined pipe coaxial with mitered tube opening；The internal diameter of above-mentioned inclined pipe and mitered tube opening are big
It is small identical；
The outlet of steady gas equalizing distributor is connect with inclined pipe, and helium is entered by quadrangle tangential circle distribution device to be pushed away
Into agent system.
Preferably, the longitudinal section of above-mentioned gas injection ring is groove-like or " c " shape；The pipe of above-mentioned mitered tube opening and corresponding position
The corner cut of body circumference is 50-70 °.
Preferably, the corner cut of the tube body circumference of above-mentioned mitered tube opening and corresponding position is 60 °；It is offered in above-mentioned tubular body
Four mitered tube openings, four mitered tube openings are evenly distributed on tube body；The area summation of above-mentioned mitered tube opening and institute
There is the area summation of venthole equal in magnitude.
Preferably, above-mentioned multiple ventholes are evenly arranged on gas injection ring.
Preferably, liquid oxygen air distribution system and kerosene air distribution system are arranged on the same distribution platform；In pressure reducer and first
Vent valve is additionally provided between solenoid valve；Liquid oxygen air distribution system and kerosene air distribution system further include second after velocity of sound orifice plate
Solenoid valve, filter, shut-off valve, pressure reducer, the first solenoid valve, velocity of sound orifice plate and second solenoid valve are set gradually along helium flow direction
On helium outlet pipe.
Preferably, the caliber DN50 of gas collecting tube, pressure rating PN23；The caliber of helium escape pipe before gas collecting tube
For DN50, pressure rating PN35；The caliber of helium escape pipe in liquid oxygen air distribution system is DN32, pressure rating PN23；
The caliber of helium escape pipe in kerosene air distribution system is DN50, pressure rating PN15.
Preferably, etc. flow resistances flowmeter replacement device is the throttle orifice being arranged in helium outlet pipe；Above-mentioned steady gas
Body equalizing distributor includes the four sections long short different pipeline section being arranged in parallel and the flow resistance tune being separately positioned on four sections of pipeline sections
Knothole plate and pressure fluctuation inhibit device, and it is one-way isolation inlet duct, above-mentioned one-way isolation that the pressure fluctuation, which inhibits device,
Inlet duct prevents liquid oxygen and kerosene from passing through, and the entrance of four sections of pipeline sections compensates the outlet of pipe by helium escape pipe and U-shaped,
The outlet of four sections of pipeline sections is connected to four inclined pipes respectively.Steady gas equalizing distributor is connect with quadrangle tangential circle distribution device
Pipeline be it is asymmetrical, by etc. flow resistances design realize unsymmetric structure gas steady stable market supply.
Preferably, above-mentioned U-shaped compensation pipe is made of hard tube, and above-mentioned one-way isolation inlet duct is check valve.
The beneficial effects of the present invention are:
1, the parameters when present invention is using analog simulation method calculating helium injection propellant, including Air Bubble Size,
It is low to design engine test Propellant Supply according to parameters obtained for the parameters such as injected gas volume, gas distribution and injection gas form
Frequency pulsation inhibition system, carries out accurate helium injection to Propellant Supply pipeline, changes propellant by the blending of gas and supplies
The intrinsic frequency of system is answered, and by reaching to propulsion to injected gas volume, gas distribution, the accurate control of injection gas form
Itself pulsation of agent is adjusted, and reduces the case where propellant feed system is coupled with engine；
2, by the application of such method, the pulsation of Propellant Supply is reduced, improves Propellant Supply stability, Jin Erti
The stability of high entire engine pump system；
3, air distribution system is supplied using helium and constant volume flow gas injected system realizes the amount and expection of injection helium
The error of value is not higher than 3% and guarantees that injecting initial phase pressure in helium rises less than 30%；It is filled using quadrangle tangential circle gas distribution
It sets and realizes that the helium of injection enters that gas injection apparatus is uniform, in the big vibration environment lower volume evenness errors of engine test
Less than 1%；
4, it selects velocity of sound orifice plate as current-limiting apparatus in helium supply air distribution system, changes flow by outlet back pressure
It influences, realizes the accurate control to liquid oxygen road and kerosene road helium gas injection rate, gas injection fast response time；
5, it is respectively provided with solenoid valve before and after velocity of sound orifice plate, first the pipeline before and after velocity of sound orifice plate is filled, is improved small
The filling velocity that helium is supplied under flow；
6, by the selection of adjustment and velocity of sound orifice plate aperture to reducer pressure, engine gas injection test helium is met
The requirement of flow, stability and filling velocity；
7, the present invention be additionally provided with vent valve between pressure reducer and solenoid valve one, can to the gas in helium escape pipe into
The complete emissions operation of row；
8, constant volume flow gas injected system of the present invention is on the base of common live calibrated in situ, the use etc. of innovation
Flow resistance calibrated in situ method, by the flow resistance to existing pipeline and mass flowmenter under using gas flow, by
Setting throttle orifice carries out flow resistance adjusting in the lesser pipeline of flow resistance, realize live calibrated in situ etc. flow resistances replacement.Sufficiently protect
The consistency for having demonstrate,proved check system and real system realizes high-precision gas flow injection；It ensure that local flow characteristic；
The amount and desired value for having reached injection helium obtain the target that error is not higher than 3%；
9, constant volume flow gas injected system of the present invention includes U-shaped compensation pipe, is made as U-shaped structure using hard tube, i.e.,
The compensation requirement for meeting power interface, since inside is smooth structure, the variation of flow behavior, is solved when reducing vibration
The pulsation phenomenon of gas injection gas under vibration；
10, the steady gas equalizing distributor in constant volume flow gas injected system of the present invention include four sections of pipeline sections and
One-way isolation inlet duct on four sections of pipeline sections is set, guarantees that the medium in liquid oxygen and Kerosene propellant system does not enter note
In gas system；And helium is enabled to uniformly enter into liquid oxygen and Kerosene propellant system；It is effectively reduced gas
Abnormal pressure when injection increases, the normal work of engine when having ensured gas injection；
11, the inclined pipe that at least one is connected to toroidal cavity is offered on quadrangle tangential circle distribution device tube body of the present invention to open
Mouthful, be connected to corresponding inclined pipe on mitered tube opening, gas out of, inclined pipe enters gas injection device toroidal cavity, inclined pipe with
Pipeline contributes to form Inlet Swirl at an angle, reduces local resistance and the gas in toroidal cavity is made to be more evenly distributed,
Eliminate the risk of pipeline break, high reliablity；
12, multiple ventholes are provided on gas injection ring, multiple ventholes are evenly distributed on gas injection ring, and gas is from aperture
It is directly injected into inner tube, injection bubble is smaller and uniform, and propellant flowing is stablized, and will not influence the normal work of engine；
13, the air inlet area summation of inclined pipe air inlet and the outlet area summation of all ventholes are equal in magnitude, are infusing
Without pressure difference is generated during gas, gas injection device will not be damaged, gas injection effect is influenced.
Detailed description of the invention
Fig. 1 is present system schematic diagram；
Fig. 2 a is the actual effect figure inhibited using present system gas injection to propellant (kerosene) pulsation；
Fig. 2 b is the actual effect figure inhibited using present system gas injection to propellant (liquid oxygen) pulsation；
Fig. 3 is that helium supplies air distribution system schematic diagram；
Fig. 4 is constant volume flow gas injected system schematic diagram；
Fig. 5 a is quadrangle tangential circle distribution device schematic diagram；
Fig. 5 b is quadrangle tangential circle distribution device cross-sectional view；
Fig. 6 is bubble distribution pilot system figure.
Appended drawing reference in figure are as follows: 1- helium supply air distribution system, 11- helium tank, 12- gas collecting tube, 13- pressure gauge, 14- are put
Air valve, 15- shut-off valve, 16- pressure reducer, the first solenoid valve of 17-, 18- velocity of sound orifice plate, 19- filter；
2- constant volume flow gas injected system, the flow resistances such as 21- scene calibrated in situ flow measurement device, the flow resistances such as 22-
Flowmeter replacement device, 23- power interface U-shaped compensation pipe, the steady gas equalizing distributor of the flow resistance of 24- unsymmetric structure；
25- flow resistance regulating orifice plate, 26- pressure fluctuation inhibit device；
3- quadrangle tangential circle distribution device, 31- tube body, 32- gas injection ring, 33- venthole, 34- mitered tube opening, 35- mitered
Pipe；
61- distribution device, 62- visualize transparent pipeline, 63- high-speed photography monitoring system, 64- gas supply electromagnetic valve, 65- stream
Body supplies pilot system, 66- gas source, 67- water circulating pump, 68- gas collecting apparatus.
Specific embodiment
Below in conjunction with drawings and the specific embodiments, the present invention will be further described.
The method of the present invention calculates Propellant Supply pipeline helium injected gas volume, gas distribution, injection gas by analog simulation
The parameters such as volume morphing, the blending for emulating gas change the intrinsic frequency of propellant feed system, reach itself arteries and veins to propellant
It is dynamic to be adjusted, reduce the case where propellant feed system is coupled with engine.Since the cavitation erosion that engine turbine pump has is abundant
Degree, in the case where form tolerance is controllable, will not impact the work of engine.By the application of such method, reduce
The pulsation of Propellant Supply improves Propellant Supply stability, and then improves the stability of entire engine pump system.The method
It is applied in engine test.
In conjunction with the method for simulation and emulation, basic parameter is determined, detailed process is as follows:
Step 1: helium bubble flow confirmation；
Injection is controlled to adjust by the flow of helium in control injection propellant according to Single bubble dynamic analysis method
The average diameter of helium bubble in propellant guarantees that injection bubble size is less than critical radius；Single bubble critical radius calculates
Method are as follows:
ρ in formulal、ρgIt is the density of liquid and injection helium respectively；ugIt is the superficial velocity for injecting helium；
Step 2: referred to by the distribution device that high-speed camera gas distributed test combination simulation analysis is established under gas flow
Guided mode type；
2.1, the dispersion by helium under flow regime carries out simulation calculation, optimizes distribution device open-cellular form；
It is emulated and is optimized by the air flow method situation under the different open-cellular forms to distribution device；It is equal to reach bubble
Even distribution, it is ensured that helium will not be gathered into larger bubbles before entering engine；
2.2, it establishes and supplies pilot system comprising fluid, bubble distribution visualizes transparent pipeline, high-speed photography monitoring system
Bubble distribution pilot system；As shown in Figure 6, gas source 66 passes through gas supply electromagnetic valve 64 and gas collecting apparatus 68 and gas distribution to specific system
Device 61 connects, and distribution device 61 is located inside visualization transparent pipeline 62；It is transparent to visualizing that fluid supplies pilot system 65
Inject liquid in pipeline 62, liquid, which flows through, is again introduced into fluid supply test by water circulating pump 67 after visualization transparent pipeline 62
System 65, liquid supply pilot system 65 and visualization 62 internal circulation flow of transparent pipeline in fluid；High-speed photography monitoring system
63 are located at the outside of visualization transparent pipeline 62；
2.3, it is flowed out, is uniformly distributed from the distribution device after step 2.1 optimization by high-speed photography acquisition helium bubble
Into fluid, the bubble distribution in flow process homogenizes the High Speed Photography Images of situation and bubble redistribution；In conjunction with image
Situation is homogenized with bubble distribution to compare and analyze, and obtains reliable bubble distribution simulation model；
2.4, the reliable bubble distribution Building of Simulation Model obtained by step 2.3, corrects the design of distribution device；
To guiding model needed for helium injection, the design of gas injection device is instructed；
Due to the particularity of gas injection system, system must satisfy following requirement:
1, have the helium gas supply system and gas injection device of high-accuracy and constant volume flow；
2, helium supply system can realize that the amount of injection helium and the error of desired value are not higher than 3%；
3, the helium injected must be uniform after entering Propellant Supply pipeline, in the big vibration environment lower body of engine test
Product evenness errors are less than 1%；
4, the helium in propellant is injected in the initial stage due to the effect of liquid resistance, and the initial phase of injection has pressure
Power rises, and the injection gas flow that this rising will lead to moment increases, and system need to guarantee that its rising need to be less than 30%；
Therefore it based on the requirement of above-mentioned test data, is built in conjunction with the simulated experiment data that simulation and the method emulated obtain
Found the system inhibited by injecting helium to low frequency pulsating:
System constitutes actual effect such as Fig. 2 a and Fig. 2 b inhibited such as Fig. 1, engine gas injection to propellant pulsation, demonstrates
By injecting proper amount of helium, the pulsation of Propellant Supply can be reduced to former pulsation 20%.
System mainly includes the helium supply air distribution system set gradually along helium flow direction, constant volume flow gas injection system
System and quadrangle tangential circle distribution device；Wherein helium supplies air distribution system, constant volume flow gas injected system to realize high-precision
The helium of constant volume flow is supplied.Quadrangle tangential circle distribution device ensures to inject bubble size uniform.
Average diameter of the bubble in propellant directly affects the rate of climb of bubble in a liquid, and has been in fluid
It is intensive to be bubbled the critical dimension that there is rupture when full turbulent, blast bubble rupture in propellant will cause flow field disorder with
Cavitation impact, generates serious vibration and flow disturbance, influences normal test run examination, will lead to engine propellant when serious
There is interval in supply.Utilize helium in helium supply air distribution system, constant volume flow gas injected system control injection propellant
Flow, realize injection propellant in helium bubble size be less than critical radius；Ensure to blast bubble in propellant not
It can rupture.Ensure that injection bubble size is uniform by designing quadrangle tangential circle distribution device simultaneously.
Helium supplies air distribution system as shown in figure 3, including multiple helium tanks 11, gas collecting tube 12, liquid oxygen air distribution system and coal
Oily air distribution system；In order to simplify system, liquid oxygen air distribution system and kerosene air distribution system are integrated on a distribution platform；Gas collecting tube
On be additionally provided with pressure gauge 13 and vent valve 14, real-time monitoring and to the gas in gas collecting tube is carried out to the pressure on gas collecting tube 12
Carry out emptying operation；The outlet of helium tank 11 is accessed in gas collecting tube 12 by shut-off valve 15 and filter 19；Liquid oxygen air distribution system
It is accessed in gas collecting tube with kerosene air distribution system, includes being successively set on shut-off valve 15, pressure reducer on helium escape pipe
16, the first solenoid valve 17 and velocity of sound orifice plate 18 can also connect second solenoid valve after velocity of sound orifice plate 18.In pressure reducer 16 and the first electricity
It is additionally provided with vent valve 14 between magnet valve 17, the gas in helium escape pipe can be discharged completely.
System uses common 40L helium tank as gas source, and the caliber of the gas collecting tube used is DN50, and pressure rating is
PN23；The caliber of helium escape pipe before gas collecting tube is DN50, pressure rating PN35；Helium in liquid oxygen air distribution system
The caliber of escape pipe is DN32, pressure rating PN23；The caliber of helium escape pipe in kerosene air distribution system is DN50, pressure
Grade is PN15.Helium tank 11 is accessed on distribution platform gas collecting tube 12, two-way is divided into from gas collecting tube 12, liquid oxygen road is provided all the way
Helium supply provides the supply of kerosene road helium all the way.It is defeated that liquid oxygen air distribution system and kerosene air distribution system can be set to multichannel
Out；Liquid oxygen is identical with coal asphalt principle, is illustrated by taking liquid oxygen road as an example, and the helium come out from gas collecting tube 12 passes through shut-off valve 15
It before reaching pressure reducer 16 afterwards, is controlled by pressure of the pressure reducer 16 to helium, velocity of sound orifice plate 18 is set after pressure reducer 16.
It selects velocity of sound orifice plate 18 as current-limiting apparatus, influences flow by outlet back pressure variation.
By the selection in 18 aperture of adjustment and velocity of sound orifice plate to 16 pressure of pressure reducer, engine gas injection test helium is met
The requirement of throughput, stability and filling velocity.
Constant volume flow gas injected system is as shown in figure 4, realize the steady of gas supply, vibration environment and dynamic duty item
Steady supply under part, including etc. flow resistances scene calibrated in situ flow measurement device 21 and equal flow along what helium flow direction was set gradually
Choked flow meter replacement device 22, power interface U-shaped compensate pipe 23, the steady gas equalizing distributor of the flow resistance of unsymmetric structure
24。
General pass through uses mass flow meter calibrating helium gas flow in situ, can measure actual helium gas flow.Due to
The vibration environment of test bay, conventional method is to substitute mass flowmenter using straight tube after calibration, due to the change of local flow resistance
Change will lead to actual flow and calibration when not being inconsistent, thus the present invention use etc. flow resistances flowmeter replacement device (etc. flow resistances stream
Amount substitution pipe) conventional straight tube is replaced, it ensure that local flow characteristic.The amount and desired value for having reached injection helium obtain error not
Target higher than 3%.
The device is on the basis of common live calibrated in situ, the flow resistances such as use of innovation scene in-situ calibration system,
By measuring the flow resistance of existing pipeline and mass flowmenter under using gas flow, it is arranged in the lesser pipeline of flow resistance
Etc. flow resistances flow substitution pipe (pipeline in be arranged throttle orifice) carry out flow resistance adjusting, realize live calibrated in situ etc. flow resistances generation
It changes.The consistency for having fully ensured that check system and real system realizes high-precision gas flow injection.
Power interface U-shaped compensates the setting of pipe mainly due to when test bay pipeline enters engine, due to thrust measurement
Demand, hose is generally set on the interface of power to carry out the compensation of power boundary.In helium injection, due to high-precision
Injection rate requirement, the ripple struction of hose can bend and beat in vibration, lead to the fluctuation of gas injection gas, influence to inject
The stability of gas devises U compensation pipe thus, is made as U-shaped structure using hard tube, that is, the compensation for meeting power interface is wanted
It asks, since inside is smooth structure, the variation of flow behavior when reducing vibration solves the pulsation of gas injection gas under vibration
Phenomenon.
The steady gas equalizing distributor 24 of unsymmetric structure includes four sections of asymmetric (length is different) confessions in parallel
Air pipe, be arranged in the flow resistance regulating orifice plate 25 on supply air line and pressure fluctuation inhibit device 26 (specific structure be unidirectionally every
From device, such as check valve etc. prevents liquid phase from entering gas phase pipeline when liquid phase pressure is higher, and liquid phase is fallen after avoiding gas phase from being pressurized
Pressure fluctuation caused by stream) pressure fluctuation inhibit device 26 outlet be connected to the mitered tube inlet of quadrangle tangential circle distribution device；
The steady gas equilibrium assignment system of unsymmetric structure can guarantee that the medium in liquid oxygen and kerosene system cannot be into
Enter in gas injection system, the use of this device solve the problems, such as two or less it is related to gas injection:
Since the idle of spatial position can not realize being uniformly distributed for 4 pipelines in the setting of pipeline when a gas injection.Work as pipe
Pressure in road after progress medium filling due to medium exists, and liquid state can enter gas injecting pipe, and not due to pipeline rout
Together, the liquid in each pipeline will be different, and when gas injection carries out, the liquid of each section can be flow backwards, and gas is caused to enter gas
The time of body injection device is different, and non-uniform gas enters, and may cause the abnormal work of engine.
After b enters gas path pipe due to liquid, when gas injection occurs, the flow resistance of liquid is sharply increased, according to test
2 times of the reachable static state of data, use through this structure, abnormal pressure when being effectively reduced gas injection increases, and protects
The normal work of engine when having hindered gas injection.
Quadrangle tangential circle distribution device effectively controls distributional pattern and distribution density after gas injection, guarantees do not influencing
Pulsation is effectively inhibited on the basis of engine work: the analogue data obtained according to the method for simulation and emulation
Carry out the design of the quadrangle tangential circle distribution device of gas injection.
The quadrangle tangential circle distribution device specific structure is as shown in figure 5, include tube body 31, and be circumferentially arranged along inboard wall of tube body
Gas injection ring 32, gas injection ring 32 and inboard wall of tube body form a closed toroidal cavity；The longitudinal section of the gas injection ring be groove-like or
" c " shape, gas injection ring can be fixed by welding in inboard wall of tube body, and multiple ventholes 33 are provided on gas injection ring, are opened up on tube body
There is at least one the mitered tube opening 34 being connected to toroidal cavity；It is in this embodiment four, and four mitered tube opening edges
Circumferentially it is evenly arranged on tube body.The corner cut of the tube body circumference of mitered tube opening and corresponding position is that effect is preferable between 50-70 °, most
Preferably 60 °；It further include being set to tube wall and being located at inclined pipe opening and the inclined pipe coaxial with mitered tube opening
35；The internal diameter of inclined pipe 35 is identical as 34 size of mitered tube opening；The area summation of mitered tube opening 34 and all ventholes 33
Area summation it is equal in magnitude, during gas injection without generate pressure difference, gas injection device will not be damaged, influence gas injection effect.
The outlet of steady gas equalizing distributor is connect with inclined pipe, and helium enters propellant system by quadrangle tangential circle distribution device
System.
At least one mitered tube opening being connected to toroidal cavity is offered on tube body, is connected on mitered tube opening corresponding
Inclined pipe, out of, inclined pipe enters gas injection device toroidal cavity, inclined pipe contributes to form gas at an angle with pipeline
Inlet Swirl reduces local resistance and the gas in toroidal cavity is made to be more evenly distributed, eliminates the risk of pipeline break, reliably
Property it is high.Multiple ventholes are provided on gas injection ring, multiple ventholes are evenly distributed on gas injection ring, and gas is directly infused from aperture
Enter inner tube, injection bubble is smaller and uniform, and propellant flowing is stablized, and will not influence the normal work of engine.According in method
The Single bubble critical radius of calculating designs the size of the venthole, it is ensured that the diameter of venthole is less than Single bubble critical radius, leads to
Cross gas injection ring, inclined pipe in the reliable bubble distribution simulation model design quadrangle tangential circle distribution device that analog simulation method obtains
The parameters such as opening, inclined pipe, outlet hole number, guarantee injection helium enter gas injection apparatus must be uniform, in engine
The big vibration environment lower volume evenness errors of test are less than 1%, and the helium of injection is in the initial stage due to the work of liquid resistance
With the initial phase of injection has pressure rising, and the injection gas flow that this rising will lead to moment increases, and guaranteeing that it rises needs
Less than 30%.
Claims (10)
1. a kind of engine test Propellant Supply low frequency pulsating suppressing method, which comprises the following steps:
Step 1: helium bubble flow confirmation；
It controls to adjust injection by the flow of helium in control injection propellant according to Single bubble dynamic analysis method and promotes
The average diameter of helium bubble in agent, so that injection bubble size is less than critical radius；It is calculated with reference to Single bubble critical radius
Formula:
ρ in formulal、ρgIt is the density of liquid and injection helium respectively；ugIt is the superficial velocity for injecting helium；
Step 2: mould is instructed by the distribution device that high-speed camera gas distributed test combination simulation analysis is established under gas flow
Type；
2.1, it is emulated by the air flow method situation under the different open-cellular forms to distribution device, is optimized according to simulation result
Distribution device, so that bubble is uniformly distributed；
2.2, it establishes and supplies pilot system comprising fluid, bubble distribution visualizes transparent pipeline, the gas of high-speed photography monitoring system
Bubble distribution pilot system；
2.3, it is flowed out from the distribution device after step 2.1 optimization by high-speed photography acquisition helium bubble, is evenly distributed to stream
In body, the High Speed Photography Images of bubble distribution situation and bubble redistribution in flow process；In conjunction with image and bubble point
Cloth situation compares and analyzes, and obtains reliable bubble distribution simulation model；
2.4, the reliable bubble distribution simulation model obtained by step 2.3, further corrects distribution device；Obtain helium note
Enter required distribution device guidance model.
2. a kind of engine test Propellant Supply low frequency pulsating inhibits system, it is characterised in that: including being flowed to successively along helium
Helium supply air distribution system, constant volume flow gas injected system and the quadrangle tangential circle distribution device of setting；
The helium supply air distribution system includes helium gas source, gas collecting tube, liquid oxygen air distribution system and kerosene air distribution system；
The outlet of the helium gas source is accessed in gas collecting tube by shut-off valve, filter and helium escape pipe；
The liquid oxygen air distribution system and kerosene air distribution system include the mass flowmenter being arranged on helium escape pipe, cut-off
Valve, pressure reducer, the first solenoid valve and velocity of sound orifice plate；
Liquid oxygen air distribution system and kerosene air distribution system entrance are connected to gas collecting tube；
The constant volume flow gas injected system includes liquid oxygen constant volume flow gas injected system and kerosene constant volume flow
Velocity of sound orifice plate in gas injection system, the liquid oxygen constant volume flow gas injected system and liquid oxygen air distribution system passes through helium
Escape pipe connection；The kerosene constant volume flow gas injected system is gone out with the velocity of sound orifice plate in kerosene air distribution system by helium
Tracheae connection；
The liquid oxygen constant volume flow gas injected system and kerosene constant volume flow gas injected system include etc. that flow resistances are existing
Calibrated in situ flow measurement device and along helium flow direction be successively set on helium outlet pipe etc. flow resistances flowmeter substitution
Device, power interface U-shaped compensation pipe and steady gas equalizing distributor；
The scene calibrated in situ flow measurement device includes mass flowmenter, for calibrating helium gas flow in situ；
The flow resistances flowmeter replacement device such as described is for after calibration, replacing mass flowmenter and the characteristic according to mass flowmenter
Adjust flow resistance；
The power interface U-shaped compensation pipe is for carrying out the compensation of power boundary and reducing the variation of flow behavior；
The steady gas equalizing distributor is used to inhibit the pressure fluctuation of gas injection starting section；
The quadrangle tangential circle distribution device is used to control distributional pattern and distribution density after gas injection；The quadrangle tangential circle cloth
Device of air includes tube body and the gas injection ring that is circumferentially arranged along inboard wall of tube body, the gas injection ring and inboard wall of tube body formed one it is closed
Toroidal cavity；
Multiple ventholes are provided on the gas injection ring；
At least one the mitered tube opening being connected to toroidal cavity is offered on the tube body；Further include be set to tube wall and
Positioned at inclined pipe opening and the inclined pipe coaxial with mitered tube opening；The internal diameter of the inclined pipe and inclined pipe openings of sizes phase
Together；
The outlet of steady gas equalizing distributor is connect with inclined pipe, and helium enters propellant by quadrangle tangential circle distribution device
System.
3. engine test Propellant Supply low frequency pulsating according to claim 2 inhibits system, it is characterised in that: described
The longitudinal section of gas injection ring is groove-like or " c " shape；The corner cut of the tube body circumference of the mitered tube opening and corresponding position is 50-
70°。
4. engine test Propellant Supply low frequency pulsating according to claim 3 inhibits system, it is characterised in that: described
The corner cut of the tube body circumference of mitered tube opening and corresponding position is 60 °.
5. engine test Propellant Supply low frequency pulsating according to claim 4 inhibits system, it is characterised in that: described
It is opened up on tube body there are four mitered tube opening, four mitered tube openings are evenly distributed on tube body；The mitered tube opening
Area summation and the area summation of all ventholes are equal in magnitude.
6. engine test Propellant Supply low frequency pulsating according to claim 5 inhibits system, it is characterised in that: described
Multiple ventholes are evenly arranged on gas injection ring.
7. inhibiting system according to any engine test Propellant Supply low frequency pulsating of claim 2-6, feature exists
In: liquid oxygen air distribution system and kerosene air distribution system are arranged on the same distribution platform；Between pressure reducer and the first solenoid valve also
It is provided with vent valve；Liquid oxygen air distribution system and kerosene air distribution system further include the second solenoid valve after velocity of sound orifice plate, filtering
Device, shut-off valve, pressure reducer, the first solenoid valve, velocity of sound orifice plate and second solenoid valve are successively set on helium outlet along helium flow direction
On pipeline.
8. engine test Propellant Supply low frequency pulsating according to claim 7 inhibits system, it is characterised in that: gas collection
The caliber DN50 of pipe, pressure rating PN23；The caliber of helium escape pipe before gas collecting tube is DN50, and pressure rating is
PN35；The caliber of helium escape pipe in liquid oxygen air distribution system is DN32, pressure rating PN23；Helium in kerosene air distribution system
The caliber of gas escape pipe is DN50, pressure rating PN15.
9. engine test Propellant Supply low frequency pulsating according to claim 8 inhibits system, it is characterised in that: wait stream
Choked flow meter replacement device is the throttle orifice being arranged in helium outlet pipe；The steady gas equalizing distributor includes simultaneously
Join the four sections long short different pipeline section of setting and the one-way isolation inlet duct that is separately positioned on four sections of pipeline sections, it is described unidirectionally every
Liquid oxygen and kerosene is prevented to pass through from inlet duct, the entrance of four sections of pipeline sections is connected by the outlet that helium escape pipe and U-shaped compensate pipe
Logical, the outlet of four sections of pipeline sections is connected to four inclined pipes respectively.
10. engine test Propellant Supply low frequency pulsating according to claim 9 inhibits system, it is characterised in that: institute
U-shaped compensation pipe is stated to be made of hard tube；The one-way isolation inlet duct is check valve.
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| CN110736526B (en) * | 2019-11-22 | 2020-12-01 | 西安航天计量测试研究所 | High-temperature gas flowmeter calibration device and method for liquid oxygen kerosene engine |
| CN111810319B (en) * | 2020-07-07 | 2021-09-10 | 西安航天动力试验技术研究所 | Rocket engine low-frequency pulsation suppression device containing gas-liquid separation and discharge system |
| CN113884305B (en) * | 2021-09-29 | 2022-06-28 | 山东大学 | Diesel engine assembly cold test detection method and system based on SVM |
| CN114893325B (en) * | 2022-04-27 | 2023-03-21 | 西安航天动力研究所 | Gas injection type accumulator for pre-pressing turbine gas by using oxidant |
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| GB2434437B (en) * | 2006-01-19 | 2011-01-26 | Siemens Ag | Improvements in or relating to combustion apparatus |
| CN101539069B (en) * | 2009-04-24 | 2010-07-14 | 北京航空航天大学 | Pressure stability control device supplied with constant voltage by propellant |
| US9109862B2 (en) * | 2011-05-24 | 2015-08-18 | Bird Aerosystems Limited | System, device, and method of protecting aircrafts against incoming threats |
| CN103541832A (en) * | 2013-09-30 | 2014-01-29 | 中国人民解放军国防科学技术大学 | Engine fuel supplying system |
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