CN108131336A - A kind of supersonic gas injector of the tangential tonifying Qi of mixing chamber - Google Patents
A kind of supersonic gas injector of the tangential tonifying Qi of mixing chamber Download PDFInfo
- Publication number
- CN108131336A CN108131336A CN201611072567.5A CN201611072567A CN108131336A CN 108131336 A CN108131336 A CN 108131336A CN 201611072567 A CN201611072567 A CN 201611072567A CN 108131336 A CN108131336 A CN 108131336A
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- CN
- China
- Prior art keywords
- injector
- mixing chamber
- tonifying
- gas
- tangential
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04F—PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED; SIPHONS
- F04F5/00—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow
- F04F5/14—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow the inducing fluid being elastic fluid
- F04F5/16—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow the inducing fluid being elastic fluid displacing elastic fluids
- F04F5/20—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow the inducing fluid being elastic fluid displacing elastic fluids for evacuating
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04F—PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED; SIPHONS
- F04F5/00—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow
- F04F5/44—Component parts, details, or accessories not provided for in, or of interest apart from, groups F04F5/02 - F04F5/42
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04F—PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED; SIPHONS
- F04F5/00—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow
- F04F5/44—Component parts, details, or accessories not provided for in, or of interest apart from, groups F04F5/02 - F04F5/42
- F04F5/46—Arrangements of nozzles
- F04F5/463—Arrangements of nozzles with provisions for mixing
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04F—PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED; SIPHONS
- F04F5/00—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow
- F04F5/44—Component parts, details, or accessories not provided for in, or of interest apart from, groups F04F5/02 - F04F5/42
- F04F5/46—Arrangements of nozzles
- F04F5/465—Arrangements of nozzles with supersonic flow
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Jet Pumps And Other Pumps (AREA)
Abstract
A kind of supersonic gas injector of the tangential tonifying Qi of mixing chamber, the injector mix diffuser 6, the first mixing chamber 7, injection gas jets 8, injector nozzle support plate 9, the mixing diffuser of end cap 10, second support plate 11 by injection gas entrance 1, outer wall 2, by injection gas entrance 3, the first mixing chamber support plate 4, tonifying Qi gas entrance 5, second and form.The tonifying Qi nozzle that tangential tonifying Qi is formed via the first mixing chamber and the second mixing diffuser forms pneumatic venturi inside the second mixing diffuser, reduce injector minimum starting pressure, and injection working medium flow can be saved by ejection gas (load) in the case that having, so as to ensure that injector reliably starts and with higher ejector capacity.
Description
Technical field
The present invention relates to a kind of devices that vacuum and fluid conveying are obtained using gas as injection working medium.
Background technology
Supersonic gas injector is a kind of fluid delivery system, it flows through superonic flow nozzzle by high pressure gas (steam)
The high velocity stream volume formed afterwards inhales another low-pressure fluid, and carries out energy exchange in a device and blended with substance, reaches extraction
Vacuum or the purpose for conveying low-pressure fluid.Ejection gas self-energy is only consumed without outer using supersonic gas injector
Add power, simple in structure, manufacture easily, it is easy to connect with pipeline, and certain gases (such as steam) can subsequently set
Standby middle condensation is recycled, and is recycled, therefore supersonic gas injector is widely used in vacuum environment and obtains field.
In general, supersonic gas injector workflow can be divided into three phases：Injector itself starts (supply injection
Gas), normal operating conditions (supplying by the supply of injection gas-holding specified time-stopping by injection gas), stop supply injection gas
(closing injector), wherein injector itself starting are the necessary stages of supersonic gas injector normal work.According to gas
Dynamics correlation theory, the mark that supersonic gas injector itself starts are that normal shock wave releases supersonic speed diffusion by ejection gas
Device exports.Therefore, after injector geometric dimension determines, it is desirable that the stagnation pressure of ejection gas necessarily is greater than minimum starting pressure,
Normal shock wave can be released to diffuser, ensure that mainstream is velocity of sound or supersonic speed in diffuser.Due to drawing for supersonic gas injector
Body of emanating accelerates to supersonic speed by Laval nozzle, and therefore, the minimum discharge of ejection gas is proportional to minimum starting pressure, draws
The mass ratio of induced-to-inducing air height of emitter is also limited to minimum starting pressure.
The supersonic gas injector of fixed structure can only can be only achieved normal working efficiency, injection under design conditions
The adjusting variation range very little of gas pressure, flow, it is necessary to could be worked normally in certain range, otherwise supersonic gas
The working efficiency of injector will be reduced greatly or even cannot be worked.Therefore, supersonic gas injector (mainly steam
Jet pump) designer makes every effort to nozzle location, the cross-section area of nozzle is adjusted according to actual condition.Such as Chinese patent
CN201827162U, CN203670313U propose the adjustable steam jet pump of nozzle location, according to the pressure of working steam, temperature
The variation of degree, flow etc., adjusts nozzle location manually, to ensure that jet pump works in Best Point, realizes system under variable working condition
Stable operation.Chinese patent CN101876329B proposes a kind of injection pump with variable nozzle, by rotation hand wheel or passes through
The flow signal control automatic executing agency of acquisition high-velocity fluid realizes the adjustability of jet pump nozzle.Chinese patent
CN102748330A proposes a kind of Multi-nozzle steam jet type heat pump and operating method, is acted on by multiinjector group, improves spray
Coefficient is penetrated, reaches stable mixed vapour pressure, reducing can not be generated by the use of the relatively low steam of pressure as driving steam
Energy waste.But the above method fails fundamentally to solve the supersonic gas injector minimum starting pressure of fixed structure
The problem of unadjustable.
Invention content
The technology of the present invention solves the problems, such as：The stagnation pressure of supersonic gas injector starting stage requirement ejection gas must be high
In minimum starting pressure, the high pressure injection gas flow needed for the fixed injector starting stage of geometry is caused, which to be much larger than, to be had
Flow needed under loading condition, so as to cause mass ratio of induced-to-inducing air low and the waste of high pressure injection working medium.Further, since injector and drawing
The design for penetrating working medium supply system is often based upon experience, therefore, if injection working medium deliverability allowance is insufficient, may cause to draw
Emitter can not start, it is necessary to injection working medium supply system (such as boiler, gas cylinder field) is transformed or adopted in the design phase
With larger allowance, this also leads to equipment scale increase, the high pressure gas wasting of resources.Take the tangential tonifying Qi of supersonic inlets into
The control of row active fluid is one of best mode for solving injector low-pressure starting.
The technical solution of the present invention：
The present invention technical solution be supersonic gas injector injection gas jets and supersonic diffuser it
Between increase a mixing chamber and tonifying Qi collection chamber, and tangential benefit is formed using newly-increased mixing chamber outer wall and former supersonic diffuser
Gas jets, for accelerating and adjusting flow of air supply and flow direction.Tonifying Qi gas forms pneumatic larynx in former supersonic diffuser
Road, sectional area are less than former supersonic diffuser sectional area, so as to reduce injector minimum starting pressure, and can have by injection
The pneumatic throat size of automatic adjusument, saving ejection gas flow in the case of gas (load), so as to ensure that injector reliably rises
It moves and there is higher mass ratio of induced-to-inducing air.
The present invention compared with prior art the advantages of it is as follows：
(1) it is constant in injector geometry, ejection gas at low pressure can be used and realize that injector normally rises
It is dynamic, so as to reduce high pressure injection gas consumption, mass ratio of induced-to-inducing air is improved, improves the economy of injector operation；
(2) it is constant in injection air source parameter and gas consumption, large area may be used than ejection gas nozzle simultaneously
Ensure that injector starts, so as to greatly improve injector compression ratio and mass ratio of induced-to-inducing air.
Description of the drawings
The supersonic gas ejector structure schematic diagram of the tangential tonifying Qi of Fig. 1 mixing chambers
The tangential tonifying Qi of Fig. 2 fluidal texture schematic diagram in supersonic diffuser
The supersonic gas injector of the tangential tonifying Qi of Fig. 3 and traditional single stage injector performance comparison
The supersonic gas injector of the tangential tonifying Qi of Fig. 4 and traditional two-stage injector performance comparison
Specific embodiment
The present invention relates to a kind of supersonic gas injectors of the tangential tonifying Qi of mixing chamber, it is characterised in that injector is by injection
Gas entrance 1, outer wall 2 mix diffuser 6, first by injection gas entrance 3, the first mixing chamber support plate 4, tonifying Qi gas entrance 5, second
Mixing chamber 7, injection gas jets 8, injector nozzle support plate 9, end cap 10, second mix diffuser support plate 11 and form.
Injection gas entrance 1 is injector and external high pressure gas piping connecting interface, using screw thread or flange and outside
Gas piping connects, and entrance pipe circulation area is 4 times or more of 8 throat area of injector nozzle.Injection gas entrance and outer wall 2
It is welded to connect.
Outer wall 2 is for packing the internal each component of support, and the cavity of formation different function therewith.Outer wall 2 uses tubing
Processing or plank roll.
By connecting interface of the injection gas entrance 3 for injector and external loading, using screw thread or flange and external loading
Pipeline connects, and injection gas entrance is welded to connect with outer wall 2.
First mixing chamber support plate 4 is used to support the first mixing chamber 5, and with the first mixing chamber 5, outer wall 2, injection gas jets 8,
Injection gas jets support plate 9 is formed is entered the room by injection aspiration.
Connecting interface of the tonifying Qi entrance 5 for tonifying Qi air source and injector, is connect using screw thread or flange with tonifying Qi air source.
Tonifying Qi entrance 5 is welded to connect with outer wall 2.
Second mixing diffuser 6 is supersonic diffuser, and type can be cross-section type, cross-section expanding, secondary venturi
Type, diffuser exit connection air or upstream device.
First mixing chamber 7 is the cross-section diffuser arrangement with tentatively being mixed by ejection gas by ejection gas.
Injection gas jets 8 are to receive the Laval nozzle of expansion type, for injection gas to be accelerated to specified Mach number.
Injection gas jets support plate 9 is used to support injection gas jets 8, and with injection gas jets 8, outer wall 2, end cap 10, injection
1 grade of gas entrance forms injection gas gas collection surge chamber.
End cap 10 is the building block of injection gas gas collection cushion chamber, welding or flanged joint between outer wall 2.
Support of the second mixing diffuser support plate 11 for the second mixing diffuser 6, and mix diffuser 6, outer wall with second
2nd, the first mixing chamber 7, the first mixing chamber support plate 4 form tonifying Qi gas collection surge chamber.
The supersonic ejector workflow of mixing chamber tonifying Qi is as follows.
Injector starts：Tonifying Qi entrance 5 is first turned on, until tonifying Qi gas collection buffers room pressure and enters interior by injection aspiration
Pressure respectively reaches setting value (calculated and determined by design) and keeps stable；Secondly, injection gas entrance 1 is opened, until injection gas collection
In gas surge chamber and enter room pressure by injection aspiration to reach setting value (calculated and determined by design) and keep stable, at this point, drawing
Emitter starts successfully.
Injector works normally：It opens by injection gas entrance 3, keeping upstream, injector enters by injection gas stable supplying
Normal operating conditions.
Injector shuts down：It is first shut off by injection gas entrance 3, until entering room pressure by injection aspiration is restored to setting value；
Secondly injector entrance 1 is closed, until entering room pressure by injection aspiration is restored to setting value；Finally, tonifying Qi entrance 5 is closed, is drawn
Emitter is stopped.
Injector working effect：To verify gas compensating type gas ejector performance, the conventional list of applicant Experimental Comparison first
Grade injector and gas compensating type injector performance (Fig. 3).Result of the test shows in mass ratio of induced-to-inducing air n=0, gas compensating type injector
Compression ratio ε is 4.2 times of conventional single stage injector compression ratio ε.In the range of mass ratio of induced-to-inducing air n=0~0.1, gas compensating type injector
The more conventional single stage ejector compression ratio ε high (curve Isosorbide-5-Nitrae) of compression ratio ε, but the requirement of operating pressure Π is lower (curve 2).Its
It is secondary, applicant's Experimental Comparison conventional two-stage injector and gas compensating type injector performance (Fig. 4).Result of the test shows in injection
During coefficient n=0, compression ratio ε=45 of conventional two-stage injector, and gas compensating type injector compression ratio ε=115, improve 1.6
Times.In mass ratio of induced-to-inducing air n≤0.08, the more conventional two-stage injector compression ratio of gas compensating type injector compression ratio is high (curve 1,2),
But the requirement of operating pressure Π is lower (curve 3).
Claims (5)
1. a kind of supersonic gas injector of the tangential tonifying Qi of mixing chamber, it is characterised in that injector is by injection gas entrance (1), outer
Wall (2) mixes diffuser (6), first by injection gas entrance (3), the first mixing chamber support plate (4), tonifying Qi gas entrance (5), second
Mixing chamber (7), injection gas jets (8), injector nozzle support plate (9), end cap (10), second mixing diffuser support plate (11) group
Into.
2. the supersonic gas injector of the tangential tonifying Qi of mixing chamber according to claim 1, it is characterized in that：Injection gas jets
(8) to receive expansion type nozzle, nozzle inner mold face connects for multi-section circular arc curve, and converging portion convergency size is 20~30 °, is expanded
It is 4~8 ° to open section angle of flare size.
3. the supersonic gas injector of the tangential tonifying Qi of mixing chamber according to claim 1, it is characterized in that：First mixing chamber
(7) it is cross-section type mixing diffuser.Mixing chamber diameter is calculated or is tested by pneumatic function and obtained, and mixing chamber draw ratio is ranging from
6~8.
4. the supersonic gas injector of the tangential tonifying Qi of mixing chamber according to claim 1, it is characterized in that：Second mixing is expanded
Gap between depressor (6) and the first mixing chamber (7) forms tonifying Qi gas jets, for controlling tonifying Qi throughput and flow direction.
5. the supersonic gas injector of the tangential tonifying Qi of mixing chamber according to claim 1, it is characterized in that：Second mixing is expanded
Depressor form can be cross-section type, cross-section expanding, secondary venturi type diffuser.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611072567.5A CN108131336A (en) | 2016-11-29 | 2016-11-29 | A kind of supersonic gas injector of the tangential tonifying Qi of mixing chamber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611072567.5A CN108131336A (en) | 2016-11-29 | 2016-11-29 | A kind of supersonic gas injector of the tangential tonifying Qi of mixing chamber |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108131336A true CN108131336A (en) | 2018-06-08 |
Family
ID=62387300
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611072567.5A Pending CN108131336A (en) | 2016-11-29 | 2016-11-29 | A kind of supersonic gas injector of the tangential tonifying Qi of mixing chamber |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108131336A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109186927A (en) * | 2018-08-17 | 2019-01-11 | 中国科学技术大学 | A kind of low stagnation pressure cold medium secondary-throat diffuser of injection |
| CN113369029A (en) * | 2021-04-30 | 2021-09-10 | 中国航天空气动力技术研究院 | Injection type low-pressure over-distance gas acceleration spray head |
| CN114518229A (en) * | 2020-11-20 | 2022-05-20 | 北京航天试验技术研究所 | Double-duct diffuser for supersonic free jet test of air-breathing engine |
| CN117646689A (en) * | 2023-12-04 | 2024-03-05 | 北京航天试验技术研究所 | Super-injection-based high-altitude simulation system and installation method thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109186927A (en) * | 2018-08-17 | 2019-01-11 | 中国科学技术大学 | A kind of low stagnation pressure cold medium secondary-throat diffuser of injection |
| CN114518229A (en) * | 2020-11-20 | 2022-05-20 | 北京航天试验技术研究所 | Double-duct diffuser for supersonic free jet test of air-breathing engine |
| CN113369029A (en) * | 2021-04-30 | 2021-09-10 | 中国航天空气动力技术研究院 | Injection type low-pressure over-distance gas acceleration spray head |
| CN117646689A (en) * | 2023-12-04 | 2024-03-05 | 北京航天试验技术研究所 | Super-injection-based high-altitude simulation system and installation method thereof |
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Application publication date: 20180608 |
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