CN108644810A - A kind of double pre- membrane type ultrasonic nozzles - Google Patents
A kind of double pre- membrane type ultrasonic nozzles Download PDFInfo
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- CN108644810A CN108644810A CN201810578235.7A CN201810578235A CN108644810A CN 108644810 A CN108644810 A CN 108644810A CN 201810578235 A CN201810578235 A CN 201810578235A CN 108644810 A CN108644810 A CN 108644810A
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- center
- pole
- nozzle
- resonant cavity
- membrane type
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- 239000012528 membrane Substances 0.000 title claims abstract description 17
- 239000003921 oil Substances 0.000 claims abstract description 33
- 239000000295 fuel oil Substances 0.000 claims abstract description 21
- 239000007921 spray Substances 0.000 claims abstract description 14
- 239000007787 solid Substances 0.000 claims abstract description 12
- 239000000446 fuel Substances 0.000 claims abstract description 5
- 238000010079 rubber tapping Methods 0.000 claims abstract description 5
- 239000011230 binding agent Substances 0.000 claims description 16
- 230000035939 shock Effects 0.000 claims description 11
- 230000008676 import Effects 0.000 claims description 4
- 230000000737 periodic effect Effects 0.000 claims description 4
- 230000015572 biosynthetic process Effects 0.000 claims description 2
- 238000000889 atomisation Methods 0.000 abstract description 21
- 238000002485 combustion reaction Methods 0.000 abstract description 9
- 230000000694 effects Effects 0.000 abstract description 9
- 239000007788 liquid Substances 0.000 abstract description 9
- 239000007789 gas Substances 0.000 description 6
- 230000009471 action Effects 0.000 description 4
- 239000012530 fluid Substances 0.000 description 4
- 238000002604 ultrasonography Methods 0.000 description 4
- 230000008602 contraction Effects 0.000 description 3
- 230000010355 oscillation Effects 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 230000005520 electrodynamics Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000003595 mist Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 210000004744 fore-foot Anatomy 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 230000010356 wave oscillation Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23R—GENERATING COMBUSTION PRODUCTS OF HIGH PRESSURE OR HIGH VELOCITY, e.g. GAS-TURBINE COMBUSTION CHAMBERS
- F23R3/00—Continuous combustion chambers using liquid or gaseous fuel
- F23R3/28—Continuous combustion chambers using liquid or gaseous fuel characterised by the fuel supply
- F23R3/30—Continuous combustion chambers using liquid or gaseous fuel characterised by the fuel supply comprising fuel prevapourising devices
- F23R3/32—Continuous combustion chambers using liquid or gaseous fuel characterised by the fuel supply comprising fuel prevapourising devices being tubular
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Nozzles For Spraying Of Liquid Fuel (AREA)
Abstract
The invention discloses a kind of double pre- membrane type ultrasonic nozzles to belong to industrial combustion field especially suitable for the ultrasonic wave atomizing nozzle of burner.It includes jet pipe, center-pole, resonant cavity, plain washer and hex nut, nozzle exit section is contracting nozzle, and center-pole left end inner hollow, center-pole right end is solid hopkinson bar, and solid rod outer surface tapping, resonant cavity, plain washer and hex nut are connected by center-pole.It is designed as a result of double pre- membrane type oil spouts and contracting nozzle formula, so that the nozzle can realize secondary-atomizing, fuel flow and air mass flow can adjust structure size to meet as needed, while can adjust resonant cavity and obtain different spray angles to nozzle exit distance.The configuration of the present invention is simple, gas liquid ratio is small, and atomizing effect is good, and atomization angle variable range is big, makes full use of design feature, flow field characteristic and the sound pressure characteristic of supersonic generator, and the atomization quality of fuel oil has been moreover improved from structure and principle, improves efficiency of combustion.
Description
Technical field
The present invention relates to a kind of double pre- membrane type ultrasonic nozzles, belong to fluid atomization techniques field.
Background technology
Combustion system is one of most important component part of spacecraft propulsion device, using fluid combustion system
It is then fuel atomization is blended, evaporated at uniform, tiny droplet-like liquid mist again by atomizer, final combustion simultaneously will
Propulsion device is discharged to obtain thrust in high-temperature high-pressure fuel gas.Therefore, atomizer is to ensure flameholding, efficient, low emission pass
One of key member.
Nozzle is a kind of concrete form of atomizer, is using the critical component in fluid combustion device.Ultrasound
Wave nozzle is a kind of new type nozzle to be grown up based on supersonic generator the eighties, due to ultrasonic wave producing method not
Together, ultrasonic nozzle is broadly divided into two classes at present：Electrodynamic type ultrasonic nozzle and Hydrokinetic-type ultrasonic nozzle.Electrodynamic type is super
Sound wave nozzle is atomized liquid using the ultrasonic wave that supersonic generator generates, and this kind of nozzle arrangements are compact, atomizing effect
It is good, but exterior electrical equipment, cost are higher, and the magnetic transformation point (generally 300 DEG C or so) of its supersonic generator is limited,
It is not suitable for hot environment.And Hydrokinetic-type ultrasonic nozzle is ejected into resonant cavity from nozzle using high-speed flow and generates ultrasound
Wave is atomized liquid, and this kind of nozzle operation pressure limit is wide, and treating capacity is big, simple in structure, at low cost, and application prospect is wide
It is wealthy.The double pre- membrane type ultrasonic nozzles designed herein belong to Hydrokinetic-type ultrasonic nozzle.
Hydrokinetic-type ultrasonic nozzle present in research at present is mostly used from the pre- film of fuel oil list or is directly injected into altogether
Shake chamber in the way of ultrasonic atomization.The ultrasonic nozzle of both atomizing types has that gas liquid ratio is too big or atomization mostly
The problems such as effect is not good enough.Design feature, flow field characteristic and the sound pressure characteristic of supersonic generator are simultaneously underutilized.
Invention content
Goal of the invention：In order to overcome the deficiencies in the prior art, the present invention to provide a kind of double pre- membrane type ultrasonic wave sprays
Mouth makes full use of design feature, flow field characteristic and the sound pressure characteristic of supersonic generator, overcomes general fluid power formula ultrasonic wave
Nozzle gas liquid ratio is too high, the imperfect defect of atomizing effect, and it is simple in structure, atomizing angle is adjustable.
Technical solution：To achieve the above object, the technical solution adopted by the present invention is：
A kind of double pre- membrane type ultrasonic nozzles, including jet pipe, center-pole, resonant cavity, plain washer and hex nut；
Wherein, coaxially center-pole left end is fixed in socket to the jet pipe, and resonant cavity is fixed by socket in center-pole right end；Institute
The spout section for stating jet pipe is converging portion, and compressed air is entered by nozzle inlet, is sprayed from jet area contraction mouth, and rectangular after spout
At supersonic airstream, air motion reflects the unstable shock for generating one of periodic swinging at the resonant cavity of downstream；
The center-pole is round bar, and left end is hollow, forms fuel gallery, and two-way oil circuit is opened up on hollow section, first
The fuel oil that road binders road sprays forms oil film at first in jet area contraction section, and the fuel oil that the second road binders road sprays is in jet pipe and resonance
Center rod outer surface between chamber forms oil film at second.
Compressed air is entered by nozzle inlet end, is sprayed after the converging portion of jet pipe, air-flow production after nozzle is expanded
It is generated as supersonic flow, one of unstable oblique shock wave is generated through reflection when supersonic flow flow to downstream resonant cavity,
Shock wave oscillation generates pressure fluctuation, when the fluctuating frequency of pressure is identical with resonant cavity intrinsic frequency, is generated altogether on the outside of center-pole
Shake shock wave i.e. ultrasonic wave；Also, resonant cavity is (total to the upstream (jet pipe nozzle exit area) of center between nozzle exit and downstream
Shake chamber forefoot area) be ultrasonic nozzle strong pressure regions.
Fuel oil enters from center-pole, divides two-way to spray in center-pole, is formed on jet pipe and center-pole respectively oily at two
Film.The fuel oil sprayed by the first via forms oil film at first in jet area contraction section internal face；The fuel oil sprayed by the second tunnel,
Nozzle opening downstream central rod outer surface forms oil film at second.Two-way nozzle opening all divides two rows, two rows of oil spout cross-distributions, and every
One row's nozzle opening is axially uniformly distributed in center-pole, to realize that atomization is uniform.
At first oil film air incoming and the strong acoustic pressure of upper jet pipe nozzle exit area effect under be broken for droplet, then with
Air sprays jet pipe, and primary atomization is completed under supersonic airstream and unstable Shock Wave；Oil film is strong in spray orifice downstream at second
Primary atomization is completed under the action of acoustic pressure and oscillation shock wave.Then, the fuel oil for having completed primary atomization surpasses on the outside of center-pole
Secondary-atomizing is completed under the action of sound wave, to reduce atomizing particle size.Finally certain angle is downstream unfolded to nozzle shaft in spraying
Flowing.
In the present invention, nozzle exit section is contracting nozzle, can enhance the stability in spout flow field, and can be suitable according to gas consumption
When change area of injection orifice；Center-pole left end inner hollow opens up nozzle opening in hollow section, and the selected foundation in oil spout hole site is ultrasound
The flow field characteristic of wave producer；Center-pole right end is solid hopkinson bar, and solid rod outer surface tapping, resonant cavity, plain washer and six
Angle nut is connected by center-pole, and the distance of resonant cavity to nozzle exit can be adjusted by hex nut, to realize that atomization angle can
It adjusts.
Further, per road binders road include two rows of nozzle openings, often arrange nozzle opening and be circumferentially uniformly distributed along center-pole, it is each
Two rows of nozzle openings on road binders road are staggered, to realize that atomization is uniform.
Preferably, it is in 90 ° of circumferentially uniformly distributed oil spouts that each row, which includes 4, in two rows of nozzle openings of the first via oil circuit
Hole, and two rows of nozzle openings are staggered in 45 °.
Preferably, it is in 60 ° of circumferentially uniformly distributed oil spouts that each row, which includes 6, in two rows of nozzle openings on second road binders road
Hole, and two rows of nozzle openings are staggered in 30 °.
Further, the resonant cavity is axial symmetry cavity, bevelling on the outside of left end.
Further, the right end of the center-pole is solid hopkinson bar, solid hopkinson bar trailing exterior surface tapping, and the resonant cavity is logical
The plain washer and hex nut being close on the right side of crossing are fixed by socket in center-pole right end, realize that atomization angle is adjustable.
Advantageous effect：A kind of double pre- membrane type ultrasonic nozzles provided by the invention, by jet pipe spout section, center-pole spray
Oil level sets the reasonable combination with nozzle opening, is divided to fuel oil to pre- film at two, considerably increases the contact area of air and fuel oil, and
Design feature, flow field characteristic and the sound pressure characteristic for taking full advantage of supersonic generator, are moreover improved from structure and principle
The atomization quality of fuel oil improves efficiency of combustion；
The multiple rows of design of nozzle opening point, and circumferential cross-distribution, improve atomization uniformity, will improve ignition temperature field；It will
Jet pipe spout section is designed as reducing-pitch thread, and air dosage is effectively controlled；Resonant cavity is adjusted to jet opening distance by hex nut,
Realize that atomization angle is adjustable；Gas liquid ratio is low, is 0.2~0.5 under declared working condition, prior art gas liquid ratio is usually 1 or more, significantly
Improve the restrictive condition used；This pair of pre- membrane type ultrasonic nozzle atomizing particle size is low, and atomization uniformity is good, atomizing angle adjustable extent
Greatly, gas liquid ratio is low, simple in structure, using there is significant practicability in advanced combustion systems.
Description of the drawings
Fig. 1 is the structural schematic diagram of the embodiment of the present invention；
Fig. 2-3 is respectively the sectional view of first via oil circuit two rows nozzle opening in the embodiment of the present invention；
Fig. 4-5 is respectively the sectional view of the second road binders road two rows nozzle opening in the embodiment of the present invention；
Fig. 6 is the E-E of the center-pole right end of the embodiment of the present invention to sectional view；
Figure includes：1- jet pipes, 2- center-poles, 3- resonant cavities, 4- plain washers, 5- hex nuts, the solid spiral shell of 6- center-poles
Line section, 7, two rows of nozzle openings of 8- first via oil circuits, 9, two rows of nozzle openings on the second road binders of 10- road.
Specific implementation mode
The present invention is further described below in conjunction with the accompanying drawings.
It is as shown in Figure 1 a kind of double pre- membrane type ultrasonic nozzles, including jet pipe 1, center-pole 2, resonant cavity 3；
Wherein, coaxially 2 left end of center-pole is fixed in socket to the jet pipe 1, and resonant cavity 3 is fixed by socket in 2 right side of center-pole
End；Compressed air is entered by 1 left end import of jet pipe, is sprayed from the convergence spout of 1 right end of jet pipe, and forms Supersonic at spout rear
Fast air-flow, air motion reflect the unstable shock for generating one of periodic swinging at downstream resonant cavity 3；
The center-pole 2 is round bar, the hollow formation fuel gallery of left end, and two-way oil circuit is opened up on hollow section, first
The fuel oil that road binders road sprays forms oil film at first in 1 converging portion internal face of jet pipe, and the fuel oil that the second road binders road sprays is in jet pipe 1
2 outer surface of center-pole between resonant cavity 3 forms oil film at second；Include two rows of nozzle openings per road binders road, often arranges nozzle opening
It is circumferentially uniformly distributed along center-pole 2, two rows of nozzle openings on each road binders road are staggered.
As shown in Figure 2,3, each row includes 4 uniformly distributed in 90 ° of circumferential directions in two rows of nozzle openings 7,8 of the first via oil circuit
Nozzle opening, and two rows of nozzle opening is staggered in 45 °.
As shown in Figure 4,5, each row includes 6 equal in 60 ° of circumferential directions in two rows of nozzle openings 9,10 on second road binders road
The nozzle opening of cloth, and two rows of nozzle openings are staggered in 30 °.
In the present embodiment, the resonant cavity 3 is axial symmetry cavity, bevelling on the outside of left end；The right end of the center-pole 2
For solid hopkinson bar, solid hopkinson bar trailing exterior surface tapping forms the solid thread segment 6 of center-pole as shown in FIG. 6, the resonant cavity 3
The plain washer 4 and hex nut 5 being close to by right side are fixed by socket in 2 right end of center-pole.
The course of work of said nozzle is as described below：
In use, compressed air is entered by 1 import of jet pipe, sprayed from the convergence spout of jet pipe 1, the pressure sprayed by jet pipe 1
Contracting air forms supersonic airstream at spout rear, and air motion is reflected at downstream resonant cavity 3 generates one of periodic swinging
Unstable shock, the pressure oscillation of shock wave can generate the pressure fluctuation of high-frequency, high amplitude near wall, work as shock oscillation
Frequency can generate ultrasonic wave when identical with 3 intrinsic frequency of resonant cavity in 2 outside of center-pole；During jet pipe 1 exports between resonant cavity 3
The upstream and downstream of heart position is respectively present a strong pressure regions；
Fuel oil is entered by the import of center-pole 2, is sprayed from four row's nozzle openings 7,8,9,10 on center-pole 2：On center-pole 2
The fuel oil that two rows of nozzle openings 9,10 by left side spray, a part form oil film at first in 1 internal face of jet pipe, and another part exists
It is broken for small oil droplet under the effect of air incoming, the small oil droplet in the oil film and nozzle flow passage of 1 internal face of jet pipe is sprayed with air and sprayed
Pipe, primary atomization is completed under the action of spout supersonic airstream and strong acoustic pressure；Two rows of nozzle openings 7 on center-pole 2 on the right side,
8 fuel oils sprayed form oil film at second under the effect of front incoming on 2 surface of center-pole in nozzle opening downstream, and oil film is swashing
Wave pressure pulses and is crushed, blends under the action of acoustic pressure, then completes primary atomization；The mist of oil of primary atomization is completed, through ultrasound
Secondary-atomizing is completed in wave effect.Then, spraying is moved along nozzle axial downstream expansion certain angle.
Fuel oil is divided at two by the present invention by the reasonable combination to jet pipe spout section, center-pole oil spout position and nozzle opening
Pre- film, considerably increases the contact area of air and fuel oil, and takes full advantage of the design feature of supersonic generator, flow field
Characteristic and sound pressure characteristic, the atomization quality of fuel oil has been moreover improved from structure and principle, and (atomizing particle size SMD can reach 4~9
μm), improve efficiency of combustion.
The above is only a preferred embodiment of the present invention, it should be pointed out that：For the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered
It is considered as protection scope of the present invention.
Claims (6)
1. a kind of double pre- membrane type ultrasonic nozzles, which is characterized in that including jet pipe (1), center-pole (2), resonant cavity (3)；
Wherein, coaxially center-pole (2) left end is fixed in socket to the jet pipe (1), and resonant cavity (3) is fixed by socket in center-pole
(2) right end；Compressed air is entered by jet pipe (1) left end import, is sprayed from the convergence spout of jet pipe (1) right end, and after spout
It is rectangular at supersonic airstream, air motion reflected at downstream resonant cavity (3) generate one of periodic swinging unstable shock；
The center-pole (2) is round bar, the hollow formation fuel gallery of left end, and two-way oil circuit, the first via are opened up on hollow section
The fuel oil that oil circuit sprays forms oil film at first in jet pipe (1) converging portion internal face, and the fuel oil that the second road binders road sprays is in jet pipe
(1) center-pole (2) outer surface between resonant cavity (3) forms oil film at second.
2. a kind of double pre- membrane type ultrasonic nozzles according to claim 1, which is characterized in that include two rows of spray per road binders road
Oilhole is often arranged nozzle opening and is circumferentially uniformly distributed along center-pole (2), and two rows of nozzle openings on each road binders road are staggered.
3. a kind of double pre- membrane type ultrasonic nozzles according to claim 1, which is characterized in that the two of the first via oil circuit
It is in 90 ° of circumferentially uniformly distributed nozzle openings that each row, which includes 4, in row's nozzle opening (7,8), and two rows of nozzle openings are staggered in 45 °.
4. a kind of double pre- membrane type ultrasonic nozzles according to claim 1, which is characterized in that the two of second road binders road
It is in 60 ° of circumferentially uniformly distributed nozzle openings that each row, which includes 6, in row's nozzle opening (9,10), and two rows of nozzle openings are staggered in 30 °.
5. a kind of double pre- membrane type ultrasonic nozzles according to claim 1, which is characterized in that the resonant cavity (3) is axis
Symmetrical cavity, bevelling on the outside of left end.
6. a kind of double pre- membrane type ultrasonic nozzles according to claim 1, which is characterized in that the right side of the center-pole (2)
End is solid hopkinson bar, solid hopkinson bar trailing exterior surface tapping, the plain washer (4) and hexagonal that the resonant cavity (3) is close to by right side
Nut (5) is fixed by socket in center-pole (2) right end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810578235.7A CN108644810A (en) | 2018-06-07 | 2018-06-07 | A kind of double pre- membrane type ultrasonic nozzles |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810578235.7A CN108644810A (en) | 2018-06-07 | 2018-06-07 | A kind of double pre- membrane type ultrasonic nozzles |
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| Publication Number | Publication Date |
|---|---|
| CN108644810A true CN108644810A (en) | 2018-10-12 |
Family
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810578235.7A Pending CN108644810A (en) | 2018-06-07 | 2018-06-07 | A kind of double pre- membrane type ultrasonic nozzles |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110011567A (en) * | 2019-05-15 | 2019-07-12 | 常州机电职业技术学院 | Energy collecting device based on coupling of gas-sound-solid multi-physical field |
| CN111841991A (en) * | 2020-06-23 | 2020-10-30 | 江苏食品药品职业技术学院 | Ultrasonic nozzle atomizing device |
| CN111889292A (en) * | 2020-06-24 | 2020-11-06 | 江苏大学 | Air-assisted electrostatic ultrasonic atomization nozzle and method |
| CN113390765A (en) * | 2021-06-30 | 2021-09-14 | 中国人民解放军战略支援部队航天工程大学 | Research method for influence of shock wave on evaporation process of fuel liquid drops under supersonic airflow |
| CN113390762A (en) * | 2021-06-30 | 2021-09-14 | 中国人民解放军战略支援部队航天工程大学 | Research device for influence of shock wave on evaporation process of fuel liquid drops under supersonic airflow |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110011567A (en) * | 2019-05-15 | 2019-07-12 | 常州机电职业技术学院 | Energy collecting device based on coupling of gas-sound-solid multi-physical field |
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| CN111889292A (en) * | 2020-06-24 | 2020-11-06 | 江苏大学 | Air-assisted electrostatic ultrasonic atomization nozzle and method |
| CN111889292B (en) * | 2020-06-24 | 2021-06-22 | 江苏大学 | Air-assisted electrostatic ultrasonic atomization nozzle and method |
| CN113390765A (en) * | 2021-06-30 | 2021-09-14 | 中国人民解放军战略支援部队航天工程大学 | Research method for influence of shock wave on evaporation process of fuel liquid drops under supersonic airflow |
| CN113390762A (en) * | 2021-06-30 | 2021-09-14 | 中国人民解放军战略支援部队航天工程大学 | Research device for influence of shock wave on evaporation process of fuel liquid drops under supersonic airflow |
| CN113390765B (en) * | 2021-06-30 | 2022-09-23 | 中国人民解放军战略支援部队航天工程大学 | Method for researching influence of shock wave on evaporation process of fuel liquid drops under supersonic airflow |
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Application publication date: 20181012 |