CN1818399A - Synthetic jetting excitor with single-membrane, double openings and double cavities - Google Patents
Synthetic jetting excitor with single-membrane, double openings and double cavities Download PDFInfo
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- CN1818399A CN1818399A CN 200610031334 CN200610031334A CN1818399A CN 1818399 A CN1818399 A CN 1818399A CN 200610031334 CN200610031334 CN 200610031334 CN 200610031334 A CN200610031334 A CN 200610031334A CN 1818399 A CN1818399 A CN 1818399A
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Abstract
The invention comprises a vibration diaphragm, and first and second cavities separated via the vibration diaphragm. First and second outlets are disposed on the first and second cavities separately. The invention can solve the ballast problem of the driver vibration diaphragm caused by the differential pressure between the controlled flow field and the environmental flow field.
Description
Technical field
The present invention is mainly concerned with fluid transmission and control technique field, refers in particular to a kind of synthetic jetting excitor with single-membrane, double openings and double cavities of synthetic zero mass jet.
Background technique
Synthesizing jet-flow is to utilize synthesizing jet-flow excitor cavity internal vibration diaphragm vibration (as piezoelectricity, ferroelectric, electromagnetism and static or piston actuated), produce successively abducent a series of non-permanent collar vortexs (or vortex pair) at actuator exit orifice seam place, it is similar to one jet to the effect of main flow.The distinguishing feature of synthesizing jet-flow technology is need not introduce extra quality in the flow field, but utilizes the jet that the fluid of self " synthesizes " in the controlled flow field, and " zero mass jet " and " jet certainly is coupled " therefore is otherwise known as.In fluid transmission and FLOW CONTROL field, strengthen aspects such as control as Micropump, flow separation control, aerodynamic force control, jet vector control, mixing, therefore the advantage that need not fluid supply and transmission system that synthesizing jet-flow has demonstrated conventional jet and do not had has potential and very wide application prospect.
Synthesizing jet-flow excitor is the core of synthesizing jet-flow technical development as the activation part of synthesizing jet-flow technology.At present, existing synthesizing jet-flow excitor has two kinds of configurations, and a kind of is that monofilm drives actuator, as shown in Figure 1, this monofilm drives actuator and comprises a diaphragm 1, a cavity 2 and an outlet 3, and horizontal line is controlled flow field 4 more than 11 among the figure, and horizontal line is environmental flow 5 below 11.Diaphragm 1 is vibration back and forth under the driving of driving force, the fluid in compression and the expansion chamber 2, and when cavity 2 was in the inflation process, the fluid in the controlled flow field 4 was inhaled in the actuator cavity 2 around actuator outlet 3; When cavity 2 is in the compression process, segment fluid flow in the cavity 2 can be discharged cavity 2 via outlet 3 again, in this suction/discharge hockets process, fluid is subjected to strong shear action near outlet 3, thereby outlet 3 edges produce flow separation (flow direction by enter cavity 2 transfer to flow to controlled flow field 4), and then scroll up and form vortex (or collar vortex) with discharging fluid, vortex is once formation, will be with self-induction speed migrated downstream, in the periodic vibration process of diaphragm 1, export 3 places at actuator and produce successively abducent a series of non-permanent collar vortexs (or vortex pair), thereby at outlet 3 downstream synthesizing jet-flows 6.Another kind is that two films drive actuator, as shown in Figure 2, two films drive actuators and comprise first diaphragm 7, second diaphragm 8, a cavity 9 and an outlet 10, its working procedure is identical with monofilm driving actuator, when but two films drive actuator work, need two power supplys, also will accurately control phase difference simultaneously well.
The deficiency that these two kinds of synthesizing jet-flow excitors exist in the prior art just is: 1, two sides that monofilm drives the diaphragm 1 in the actuator are in respectively in controlled flow field 4 and the environmental flow 5, and two films drive first diaphragm 7 of actuator and two sides of second diaphragm 8 also are in respectively in controlled flow field 4 and the outer flow field 5 of environment, therefore when existing controlled flow field 4 and environment outside between the flow field 5 than pressure reduction greatly, to make diaphragm 1, first diaphragm 7 and second diaphragm 8 bear big ballast, this strand ballast is constrained vibration film 1 greatly, the vibration of first diaphragm 7 and second diaphragm 8, make diaphragm 1, first diaphragm 7 and second diaphragm 8 can't starting of oscillations, make the synthesizing jet-flow excitor can't proper functioning, excessive ballast even can press and wear diaphragm 1, first diaphragm 7 and second diaphragm 8 cause catastrophic collapse to synthesizing jet-flow excitor; 2, a side of diaphragm 1, first diaphragm 7 and second diaphragm 8 is in the outer flow field 5 of environment in monofilm driving actuator and the two film driving actuator, therefore the radiation energy of diaphragm 1, first diaphragm 7 and 8 vibrations of second diaphragm has half dissipation to be wasted in the environment outflow 5 not obtain utilizing, thereby has reduced the whole work efficiency of jet-flow excitor.
Summary of the invention
The technical problem to be solved in the present invention just is: at the technical problem of existing synthesizing jet-flow excitor existence, the invention provides a kind of novelty simple in structure, the actuator diaphragm ballast problem that pressure reduction causes between controlled flow field and environmental flow can be effectively solved, and the synthetic jetting excitor with single-membrane, double openings and double cavities of diaphragm vibration radiation energy can be made full use of.
In order to solve the problems of the technologies described above, the solution that the present invention proposes is: a kind of synthetic jetting excitor with single-membrane, double openings and double cavities, it comprises a diaphragm, first cavity and second cavity, it is characterized in that: described first cavity and second cavity are individual cavity separately, separate by diaphragm between first cavity and second cavity; Offer first outlet and second outlet on first cavity and second cavity respectively.
Be provided with between first outlet of described first cavity and second cavity and second outlet can slidable adjustment fluent of accent.
Fluent of described accent be shaped as boss shape, trapezoid body, prismatic body, cuboid or other are irregularly shaped.
First outlet and second exports on described first cavity and second cavity is shaped as circular hole or narrow slit.
Compared with prior art, advantage of the present invention just is:
1, synthetic jetting excitor with single-membrane, double openings and double cavities of the present invention adopts two cavitys to share the structure of a diaphragm, like this, two sides of diaphragm all are in same controlled flow field, thereby effectively avoided the diaphragm ballast problem that pressure reduction causes between controlled flow field and environmental flow, and made full use of the radiation energy of diaphragm vibration, the radiation energy that is produced when diaphragm is vibrated is used in the controlled flow field fully;
2, synthetic jetting excitor with single-membrane, double openings and double cavities of the present invention is installed the area ratio that two outlets controlled in fluent an of accent that is used to transfer the stream effect between the outlet of two cavitys, thereby can effectively control the velocity ratio and the ratio of momentum of two outlet jets, realize the deflection vector of synthesizing jet-flow, like this, make this synthesizing jet-flow excitor synthesizing jet-flow itself have the can regulate function, this lays a good foundation and has created condition for synthesizing jet-flow excitor carries out intellectuality and optimization FLOW CONTROL;
3, synthetic jetting excitor with single-membrane, double openings and double cavities of the present invention can utilize not fluent flow performance of controlling synthesizing jet-flow of accent of isomorphism type; Transfer fluent as the boss configuration, then can utilize the barrier effect of boss to reduce to entrainment mutually between two adjacent jets and offset and impel it to entrainment more fluid on every side, and the wall attachment effect that can utilize jet by boss guide two adjacent jets and to and merge, make that synthesizing jet-flow is wideer, energy level is higher;
4, synthetic jetting excitor with single-membrane, double openings and double cavities of the present invention have simple in structure, volume is little, cost is low, easily and the integrated characteristics of other micro control unit, be adapted to produce in enormous quantities, and being suitable for single synthetic jetting excitor with single-membrane, double openings and double cavities is that the unit is fabricated to array structure, like this can the integrated array synthesizing jet-flow, greatly improve the total energy of synthesizing jet-flow, realize control the large size flow field.
Description of drawings
Fig. 1 is the working principle schematic representation of monofilm synthesizing jet-flow excitor in the prior art;
Fig. 2 is the working principle schematic representation of two film synthesizing jet-flow excitors in the prior art;
Fig. 3 is synthetic jetting excitor with single-membrane, double openings and double cavities embodiment's 1 an of the present invention structural representation;
Fig. 4 is the cross-sectional configuration schematic representation among Fig. 3;
Fig. 5 is the structural principle schematic representation of the embodiment of the invention 1:
Fig. 6 is the structural principle schematic representation of the embodiment of the invention 2;
Fig. 7 is the structural principle schematic representation of the embodiment of the invention 3;
Fig. 8 is the structural principle schematic representation of the embodiment of the invention 4:
Synthesizing jet-flow speed vector figure when Fig. 9 is the embodiment of the invention 1 use;
Synthesizing jet-flow speed vector figure when Figure 10 is the embodiment of the invention 2 uses;
Synthesizing jet-flow speed vector figure when Figure 11 is the embodiment of the invention 3 uses;
Synthesizing jet-flow speed vector figure when Figure 12 is the embodiment of the invention 4 uses.
Marginal data
1, diaphragm 2, cavity
3, outlet 4, controlled flow field
5, environmental flow 6, synthesizing jet-flow
7, first diaphragm 8, second diaphragm
9, cavity 10, outlet
11, horizontal line 12, diaphragm
13, first cavity 14, second cavity
15, first outlet, 16, second outlet
17, synthesizing jet-flow 18, accent are fluent
Embodiment
Below with reference to the drawings and specific embodiments the present invention is described in further details.
Embodiment 1: as shown in Figure 3 and Figure 4, synthetic jetting excitor with single-membrane, double openings and double cavities of the present invention, it comprises a diaphragm 12, first cavity 13 and second cavity 14, separate formation cavity independently separately by diaphragm 12 between this first cavity 13 and second cavity 14, offer first outlet, 15 and second outlet 16 on first cavity 13 and second cavity 14 respectively.Wherein, the vibratory drive of diaphragm 12 can be any one of driving mode such as piezoelectricity, ferroelectric, electromagnetism, static, piston, the material of diaphragm 12 can adopt elastic material, flexible material or composite material, the shape of diaphragm 12 can be designed to arbitrary shape on request, as being circle or rectangle etc.; The shaped design that first cavity 13 and second cavity 14 can reach diaphragm 12 on request is an arbitrary shape, as being cylindrical body and cuboid etc., is cuboid as shown in Figure 3 in the present embodiment; Cavity material is the hard material of inflexibility, is suitable for material and the technology manufacturing of adopting micro machining compatible mutually with micro mechanical technology; First cavity 13 is connected with a side seal of diaphragm 12 respectively with second cavity 14, and the shape of the outlet of first on first cavity 13 and second cavity 14 15 and second outlet 16 can be an arbitrary shape, adopts circular hole or narrow slit (as shown in Figure 3) usually.
Working principle: referring to Fig. 5, horizontal line is controlled flow field 4 more than 11 among the figure, and horizontal line is environmental flow 5 below 11.Diaphragm 12 is vibration back and forth under driving, the fluid of compression and expand first cavity 13 and second cavity 14, when diaphragm 12 is in to the right vibration processes, first cavity 13 is in inflation process, fluid in the controlled flow field 4 is inhaled into actuator first cavity 13 around actuator first outlet 15, and second cavity 14 is in compression process simultaneously, and the segment fluid flow in second cavity 14 is extruded discharge via second outlet 16; When diaphragm 12 is in to the left vibration processes, first cavity 13 is in compression process, segment fluid flow in first cavity 13 is extruded discharge via first outlet 15, and while second cavity, 14 place's inflation processes, fluid in the controlled flow field 4 is inhaled in actuator second cavity 14 around actuator second outlet 16, in this suction/discharge hockets process, there is one unsteady flow to form respectively in first outlet, 15 and second outlet 16, these two strands of jet phase differences are 180 °, interact in the migrated downstream process and are fused into the higher synthesizing jet-flow of one energy 17.Because two sides of diaphragm 12 are in actuator first cavity 13 and second cavity 14 respectively, 14 of first cavity 13 and second cavitys communicate with same controlled flow field 4 by first outlet, 15 and second outlet 16 respectively, the working environment of two sides that is diaphragm 12 is identical, therefore the synthetic jetting excitor with single-membrane, double openings and double cavities diaphragm 12 ballast problems that can effectively avoid controlled flow field 4 and 5 pressure reduction of environmental flow to cause, and diaphragm 12 are energized device first cavity 13 respectively and second cavity 14 makes full use of to the radiation energy of both direction vibration.In embodiment 1, diaphragm 12 adopts Piezoelectric Driving, frequency of okperation 500Hz, and first outlet, 15 and second outlet 16 is the narrow slit of wide 1mm.As shown in Figure 9, the speed vector figure of embodiment 1 actuator synthesizing jet-flow 17, during diaphragm 12 work, in actuator first outlet 15 and second outlet 16 one nonsteady jet is arranged respectively, phase difference is 180 °, and two strands of jets are exporting the downstream interaction and are being fused into the higher synthesizing jet-flow of one energy 17.
Embodiment 2: as shown in Figure 6, present embodiment is to increase fluent 18 of an accent on embodiment 1 the basis between first outlet, 15 and second outlet 16.Transfer and to adopt different configurations for fluent 18, as boss shape, trapezoid body, prismatic body, cuboid or other anomalistic objects, the material that this accent is fluent 18 is the hard material of inflexibility, be suitable for adopting micro machining and the micro mechanical technology material and the technology manufacturing of compatibility mutually, transfer fluent 18 between first outlet, 15 and second outlet 16 of actuator, and can under control, horizontally slip along substantially horizontal.
Working principle: when transferring first outlet 15 that slides to the left side for fluent 18, referring to Fig. 6, the discharge area of first outlet 15 reduces, correspondingly second outlet, 16 areas increase, under the constant condition of flow, speed and level of momentum that first outlet, 15 places produce jet increase, and produce effluxvelocity at outlet 16 places and level of momentum reduces, the different jet of these two strands of momentum will change to a low-yield lateral deviation after interacting and merging, and promptly be partial to the right side; Slide to right side second outlet 16 for fluent 18 if transfer, then synthesizing jet-flow 17 will be partial to the left side.Therefore, by transferring the area ratio of fluent 18 control first outlet 15 and second outlet 16, can effectively control the velocity ratio and the ratio of momentum of two outlet synthesizing jet-flows 17, realize the deflection vector of synthesizing jet-flow 17, make synthetic jetting excitor with single-membrane, double openings and double cavities of the present invention itself have vector can regulate function, this lays a good foundation and has created condition for synthesizing jet-flow excitor carries out intellectuality and optimization FLOW CONTROL.In embodiment 2, transfer fluent 18 slippage 0.3mm to the left in the horizontal direction, therefore the area of first outlet, 15 and second outlet 16 is than becoming 0.7: 1.3 by original 1: 1, and other parameter is identical with embodiment 1.As shown in figure 10, synthetic jetting excitor with single-membrane, double openings and double cavities is being transferred the speed vector figure that slides to back, left side synthesizing jet-flow 17 for fluent 18, first outlet 15 place's effluxvelocities and level of momentum increase, and the effluxvelocity and the level of momentum at second outlet, 16 places reduce, the synthesizing jet-flow 17 deflection right sides after these two strands of jets merge.
Embodiment 3: as shown in Figure 7, the structure of present embodiment is basic identical with embodiment 2, and difference just is to transfer fluent 18 configuration difference, and its structure and working principle are illustrated as shown in Figure 7.Transfer and to adopt different configurations for fluent 18, be configured as example (as Fig. 7) with boss, its working principle is: utilize the barrier effect of boss to reduce to export entrainmenting negative function mutually and impelling it to entrainment more fluid on every side of 15 and 16 liang of adjacent jets, and the wall attachment effect of utilizing jet by boss guide two adjacent jets and to merging, make synthesizing jet-flow 17 become wideer, energy is higher.The running parameter of actuator is identical with embodiment 1 among the embodiment 3.Figure 11 for synthetic jetting excitor with single-membrane, double openings and double cavities adopt the boss configuration to transfer fluent after synthesizing jet-flow 17 speed vector figures.Compare with Fig. 9, Figure 10, synthesizing jet-flow becomes wideer among Figure 11, and energy is higher.Therefore, synthetic jetting excitor with single-membrane, double openings and double cavities can utilize fluent of the accent of isomorphism type not, controls the flow performance of synthesizing jet-flow, as utilizes the boss configuration to transfer fluent, makes synthesizing jet-flow become wideer, and energy is higher.
Embodiment 4: as shown in Figure 8, the structure of present embodiment is to be the integrated array structure that forms in unit with single synthetic jetting excitor with single-membrane, double openings and double cavities, and its structure and working principle signal are as shown in Figure 8.Exciter array adopts a power source driving, and its power will double by the quantity of exciter units, can increase a phase inverter as requested simultaneously and control different diaphragms 12, realizes the different characteristic of array synthesizing jet-flow.During exciter array work, in each exciter units downstream synthesizing jet-flow 17 is arranged all, the more single actuator of the total energy of this array stimulating device increases substantially, and can implement control to the large size flow field.In embodiment 4, adopt four actuators to be integrated into an array, increase a phase inverter, diaphragm 12 initial phase from left to right is followed successively by 0 °, 180 °, 0 °, 180 °, and other parameter of single actuator is identical with embodiment 1.Figure 12 is integrated into the speed vector figure of the synthesizing jet-flow 17 of array structure for synthetic jetting excitor with single-membrane, double openings and double cavities.Adjacent synthesizing jet-flow 17 interacts, and demonstrates different Field Characteristics.
The present invention is not limited to above four embodiments, in addition, the spacing of first outlet, 15 and second outlet 16 can be designed as big distance, two strands of jets in first outlet, 15 and second outlet, 16 downstreams interact more greatly and not owing to spacing like this, thereby become two strands of independently synthesizing jet-flows; Can also adopt fluent 18 of the accent of other configurations as required, or the monofilm two-chamber twoport actuator that is integrated into array structure can increase also to transfer and implements control or the like for fluent 18.Generally speaking, the present invention is not only simple in structure, but also can effectively solve the actuator diaphragm ballast problem that pressure reduction causes between controlled flow field and environmental flow, and can make full use of the radiation energy of diaphragm vibration.
Claims (4)
1, a kind of synthetic jetting excitor with single-membrane, double openings and double cavities, it comprises a diaphragm (12), first cavity (13) and second cavity (14), it is characterized in that: described first cavity (13) and second cavity (14) are individual cavity separately, separate by diaphragm (12) between first cavity (13) and second cavity (14); Offer first outlet (15) and second outlet (16) on first cavity (13) and second cavity (14) respectively.
2, synthetic jetting excitor with single-membrane, double openings and double cavities according to claim 1 is characterized in that: first outlet (15) and second of described first cavity (13) and second cavity (14) export be provided with between (16) can slidable adjustment fluent of accent (18).
3, synthetic jetting excitor with single-membrane, double openings and double cavities according to claim 2 is characterized in that: described accent fluent (18) be shaped as boss shape, trapezoid body, prismatic body, cuboid or other are irregularly shaped.
4, according to claim 1 or 2 or 3 described synthetic jetting excitor with single-membrane, double openings and double cavities, it is characterized in that: what last first outlet (15) of described first cavity (13) and second cavity (14) and second exported (16) is shaped as circular hole or narrow slit.
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| CNB2006100313340A CN100381710C (en) | 2006-03-13 | 2006-03-13 | Synthetic jetting excitor with single-membrane, double openings and double cavities |
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| CNB2006100313340A CN100381710C (en) | 2006-03-13 | 2006-03-13 | Synthetic jetting excitor with single-membrane, double openings and double cavities |
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| CN102014567A (en) * | 2010-10-11 | 2011-04-13 | 中国人民解放军国防科学技术大学 | Dynamical pressure type high-energy synthetic jet actuator |
| CN103307583A (en) * | 2013-06-28 | 2013-09-18 | 华南理工大学 | Synthetic jet heat dissipation base for LED lamp |
| CN104196832A (en) * | 2014-07-10 | 2014-12-10 | 中国人民解放军国防科学技术大学 | Vector adjustable synthesis double-jet-flow device based on flow adjusting sliding block controlled by micro motor |
| CN104791218A (en) * | 2015-03-25 | 2015-07-22 | 北京航空航天大学 | Piston type synthetic jet exciter with auxiliary air inlet grooves |
| CN105299001A (en) * | 2015-10-12 | 2016-02-03 | 中国人民解放军国防科学技术大学 | Porous synthetic jet actuator for heat dissipation |
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| CN110193316A (en) * | 2019-01-22 | 2019-09-03 | 南京理工大学 | A kind of fluid driver and fluid excitation system |
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| US5758823A (en) * | 1995-06-12 | 1998-06-02 | Georgia Tech Research Corporation | Synthetic jet actuator and applications thereof |
| US6457654B1 (en) * | 1995-06-12 | 2002-10-01 | Georgia Tech Research Corporation | Micromachined synthetic jet actuators and applications thereof |
| AU2002255688A1 (en) * | 2001-03-10 | 2002-09-24 | Georgia Tech Research Corporation | Modification of fluid flow about bodies and surfaces through virtual aero-shaping of airfoils with synthetic jet actuators |
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| CN102014567B (en) * | 2010-10-11 | 2012-06-27 | 中国人民解放军国防科学技术大学 | Dynamical pressure type high-energy synthetic jet actuator |
| CN103307583A (en) * | 2013-06-28 | 2013-09-18 | 华南理工大学 | Synthetic jet heat dissipation base for LED lamp |
| CN104196832B (en) * | 2014-07-10 | 2017-02-15 | 中国人民解放军国防科学技术大学 | Vector adjustable synthesis double-jet-flow device based on flow adjusting sliding block controlled by micro motor |
| CN104196832A (en) * | 2014-07-10 | 2014-12-10 | 中国人民解放军国防科学技术大学 | Vector adjustable synthesis double-jet-flow device based on flow adjusting sliding block controlled by micro motor |
| CN104791218A (en) * | 2015-03-25 | 2015-07-22 | 北京航空航天大学 | Piston type synthetic jet exciter with auxiliary air inlet grooves |
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| CN106733310A (en) * | 2015-11-20 | 2017-05-31 | 英业达科技有限公司 | Combining jet device |
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| CN107269634A (en) * | 2017-06-29 | 2017-10-20 | 中国人民解放军国防科学技术大学 | One kind is controlled by electricity fully Vector modulation twin-jet apparatus and generation method |
| CZ309433B6 (en) * | 2017-07-20 | 2023-01-11 | Ăšstav termomechaniky AV ÄŚR, v. v. i. | Method and equipment for generating synthesized or hybrid synthesized fluid stream |
| CN108393199A (en) * | 2018-04-27 | 2018-08-14 | 清华大学 | Combining jet device |
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| CN110193316A (en) * | 2019-01-22 | 2019-09-03 | 南京理工大学 | A kind of fluid driver and fluid excitation system |
| CN111688891A (en) * | 2020-06-23 | 2020-09-22 | 西北工业大学 | Open-loop active flow control device of underwater glider based on synthetic jet |
| CN112943754A (en) * | 2021-04-22 | 2021-06-11 | 中国人民解放军国防科技大学 | Vector fluidic device driven by double piezoelectric vibrators |
| CN113829245A (en) * | 2021-09-30 | 2021-12-24 | 中国人民解放军国防科技大学 | Nano jet polishing device |
| CN113830291A (en) * | 2021-11-05 | 2021-12-24 | 中国人民解放军国防科技大学 | Virtual variable pneumatic layout intelligent control system of aircraft |
| CN113830291B (en) * | 2021-11-05 | 2024-01-16 | 中国人民解放军国防科技大学 | Virtual variable pneumatic layout intelligent control system of aircraft |
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