CN108910019A - A kind of air flow system using the micro- broached-tooth design of thermo bimetal - Google Patents
A kind of air flow system using the micro- broached-tooth design of thermo bimetal Download PDFInfo
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- CN108910019A CN108910019A CN201810730177.5A CN201810730177A CN108910019A CN 108910019 A CN108910019 A CN 108910019A CN 201810730177 A CN201810730177 A CN 201810730177A CN 108910019 A CN108910019 A CN 108910019A
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- micro
- thermo bimetal
- hot plate
- electric hot
- saw blade
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64C—AEROPLANES; HELICOPTERS
- B64C21/00—Influencing air flow over aircraft surfaces by affecting boundary layer flow
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64C—AEROPLANES; HELICOPTERS
- B64C3/00—Wings
Abstract
The present invention discloses a kind of air flow system using the micro- broached-tooth design of thermo bimetal.The system comprises：Pedestal, the micro- Saw blade of thermo bimetal, electric hot plate and controller, the electric hot plate is embedded on the pedestal, the micro- Saw blade of thermo bimetal is close to the top of the electric hot plate, the controller is connect with the electric hot plate, the controller is used to control temperature, hot-fluid and the heating time of the electric hot plate, and air is flowed in the top of the micro- Saw blade of the thermo bimetal.The active control of flowing is realized in the flowing that boundary layer can be changed using system of the invention.
Description
Technical field
The present invention relates to field of fluid mechanics, flow more particularly to a kind of air using the micro- broached-tooth design of thermo bimetal
Control system.
Background technique
Early in the sixties in last century, the fair current of NASA's discovery wall surface can be substantially reduced rubbing for wall surface to very low power
Resistance is wiped, this revolutionizes the smaller traditional concept of the more smooth frictional resistance of wall surface, therefore the drag reduction based on very low power structure
Technology is come into being.With the development of theory relevant to turbulent flow, it was recognized that the core of groove drag reduction is wall surface
Flowing coherent structure in micro-structure change boundary layer, it is then a variety of to have been obtained extensively based on micro-structure passive flow control techniques
General development, as the vortex generator on wing can effectively delay the separation of flowing.Due to wall surface macro structural scale very little,
It is typically only capable to realize the passive control of flowing, i.e. the control scale of micro-structure is fixed and invariable, as very low power, micro swirl occur
Device.But in fact, passive flowing control is usually applicable only to design conditions, and the passive flowing under off-design condition controls dress
Some negative effects may be brought by being equipped with.It on the one hand can be avoided the flowing point on wing such as the vortex generator on wing
From it can also cause the increase of resistance.Therefore, it is desirable to when flow separation present on wing vortex generator just work,
Without there is no need to vortex generators under the operating condition of flow separation, that is, wish that vortex generator is a kind of active control device
Form exists, rather than the passive control device of script.On the other hand, it is analyzed from flow theory, due to the stream in boundary layer
Dynamic (especially turbulent boundary layer) scale is the UNSTEADY FLOW phenomenon of multi-scale coupling, closely related with flying condition, not
Unalterable, therefore its macro structural scale is also required to carry out control appropriate to adapt to different flox condition.
Summary of the invention
The object of the present invention is to provide a kind of air flow system using the micro- broached-tooth design of thermo bimetal, Neng Gougai
The active control of flowing is realized in the flowing of variable boundary layer.
To achieve the above object, the present invention provides following schemes：
A kind of air flow system using the micro- broached-tooth design of thermo bimetal, the system comprises：The double gold of pedestal, heat
Belong to micro- Saw blade, electric hot plate and controller, the electric hot plate is embedded on the pedestal, and the micro- Saw blade of thermo bimetal is close to
The top of the electric hot plate, the controller are connect with the electric hot plate, and the controller is used to control the temperature of the electric hot plate
Degree, hot-fluid and heating time, air are flowed in the top of the micro- Saw blade of the thermo bimetal.
Optionally, the controller is computer.
Optionally, the pedestal uses duralumin material.
Optionally, the space widths such as micro- Saw blade of the thermo bimetal are arranged.
Optionally, it is micro- to be greater than the thermo bimetal for the thermal expansion coefficient of the metal of the micro- Saw blade lower surface of the thermo bimetal
The thermal expansion coefficient of Saw blade upper surface.
Optionally, the electric hot plate is for being adjusted the height of the micro- Saw blade of the thermo bimetal, when the electric heating
When plate heats, the tooth tip of the micro- Saw blade of thermo bimetal is upturned, and the height tilted can be higher by where the pedestal
The height of horizontal plane.
Optionally, when the electric hot plate does not heat, the horizontal plane where the tooth tip of the micro- Saw blade of thermo bimetal is not high
The height of horizontal plane where the pedestal.
The specific embodiment provided according to the present invention, the invention discloses following technical effects：The present invention provides one kind and adopts
With the air flow system of the micro- broached-tooth design of thermo bimetal, electric hot plate is heated by controller, and controls electric heating
The hot-fluid and Temperature Distribution of plate, the temperature distortion in a heated condition of thermo bimetal's Saw blade, tooth tip therein will be upwarped and be protruded from
Pedestal forms the micro-structure on control plane.The micro-structure will change the fluidal texture in boundary layer, realize in boundary layer
Turn to twist, the influence of frictional resistance, the flow parameters such as pressure fluctuation, is finally reached the purpose of flowing control.
Detailed description of the invention
It in order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, below will be to institute in embodiment
Attached drawing to be used is needed to be briefly described, it should be apparent that, the accompanying drawings in the following description is only some implementations of the invention
Example, for those of ordinary skill in the art, without any creative labor, can also be according to these attached drawings
Obtain other attached drawings.
Fig. 1 is the air flow system structure chart that the embodiment of the present invention uses the micro- broached-tooth design of thermo bimetal；
Fig. 2 is that electric hot plate of the embodiment of the present invention extends the Temperature Distribution schematic diagram to z under the action of control circuit；
Fig. 3 is thermo bimetal of embodiment of the present invention Saw blade schematic diagram and its parameter；
Fig. 4 is the micro- broached-tooth design flow control principle schematic diagram of the embodiment of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, with reference to the accompanying drawing and specific real
Applying mode, the present invention is described in further detail.
Fig. 1 is the air flow system structure chart that the embodiment of the present invention uses the micro- broached-tooth design of thermo bimetal, such as Fig. 1
It is shown, a kind of air flow system using the micro- broached-tooth design of thermo bimetal, the system comprises：Pedestal 1, thermo bimetal
Micro- Saw blade 2, electric hot plate 3 and controller 4, the electric hot plate 3 are embedded on the pedestal 1, the micro- Saw blade 2 of thermo bimetal
It is close to the top of the electric hot plate 3, the controller 4 is connect with the electric hot plate 3, and the controller 4 is for controlling the electricity
Temperature, hot-fluid and the heating time of hot plate 3, air are flowed in the top of the micro- Saw blade of the thermo bimetal.The controller 4 is
Computer.The pedestal 1 uses duralumin material.
The equal space widths setting of the micro- Saw blade 2 of thermo bimetal.The metal of micro- 2 lower surface of Saw blade of thermo bimetal
Thermal expansion coefficient is greater than the thermal expansion coefficient of the micro- Saw blade upper surface of the thermo bimetal.
The electric hot plate 3 is for being adjusted the height of the micro- Saw blade of the thermo bimetal 2, when the electric hot plate 3 adds
When hot, the tooth tip of the micro- Saw blade 2 of thermo bimetal is upturned, and the height tilted can be higher by the 1 place water of pedestal
The height of plane.When the electric hot plate 3 does not heat, the horizontal plane where the tooth tip of the micro- Saw blade 2 of thermo bimetal is not higher than
The height of the 1 place horizontal plane of pedestal.
After controller 4 and the electric hot plate 3 are powered, controllable electric hot plate will form the high-temperature region of part, so that working as
The bimetallic sawtooth temperature distortion on ground, the prominent surface of tooth tip forms the micro-structure on prominent surface, and the micro-structure will change boundary
Flowing in layer, to realize the active control of flowing.
Here material of the pedestal 1 using thermally conductive smaller easy processing, such as duralumin material.Electric hot plate 3, which is adopted, to computerized control
Its heating power everywhere, and realize the Temperature cycling distribution that space interval is W, the temperature difference is T, Fig. 2 is the embodiment of the present invention
Electric hot plate extends the Temperature Distribution schematic diagram to z under the action of control circuit, as shown in Figure 2.The micro- Saw blade 2 of thermo bimetal is adopted
It is process with thrermostatic bimetal-plate, it specifically can be according to the standard GB/T 4461 of thermo bimetal, in applicable temperature range
The high responsive type material of resistance is chosen in (240-400K).Fig. 3 is thermo bimetal of embodiment of the present invention Saw blade schematic diagram and its ginseng
Number, as shown in figure 3, its space width of Saw blade shape is L, a length of S of tooth, height outstanding is H after temperature distortion, and wherein H can be by
The heating power of electric hot plate controls.In the present invention there are two most important control parameters：One is Temperature Distribution gap W, sawtooth
Projecting height H, the two parameters are adjusted by controlling the Temperature Distribution of wall surface.
The present invention mainly applies the flowing on aircraft wing to control, main there are two purpose, and one is to inhibit flowing point
From the lift control technology based on phenomenon, another kind is to postpone the draught control technology based on flow transition phenomenon.The present invention
The flowing in boundary layer is influenced by the height H of the prominent wall surface of control tooth tip.When projecting height is suitable with boundary layer thickness,
Broached-tooth design will play the role of vortex generator, plays and inhibits flow separation.When the viscosity of projecting height and wall surface
When scale is suitable, broached-tooth design will affect the turbulent flow support mechanism in boundary layer, play inhibition turbulence pulsation, reduce frictional resistance
Effect.
Working principle：
The Temperature Distribution of electric hot plate controls.By the heating power of the control electric hot plate of computer everywhere, realize given
Temperature Distribution, the Temperature Distribution are the upward periodic function of exhibition, and period W is the integral multiple of space width L, controls temperature
TCIt is determined by electric hot plate heating power, TWFor environment temperature, temperature difference Δ T will be passed to the bimetallic being tightly attached on electric hot plate
Micro- Saw blade.
Controllable deforming under the micro- sawtooth of thermo bimetal is heated.Under circuit control, micro- sawtooth positioned at high-temperature will be in electricity
Controllable deformation occurs under the action of hot plate, tooth tip, which will upwarp, protrudes from control plane, the micro-structure on formation control plane, and
The sawtooth in room temperature area will remain unchanged.Linear relationship is generally presented in deformation and temperature due to bimetallic material, passes through
To electric plate temperature TCControl can adjusting tooth point projecting height H very well, can specifically be estimated by Wella rope formula.
Control of the micro-structure to flowing in wall surface.Sawtooth on prominent control plane will form the wedge structure of minute yardstick,
When upstream, incoming flow flows through the wedge shape, by downstream generate it is a pair of reversed flow to vortex structure, this can will be on the outside of boundary layer to whirlpool
High-velocity fluid volume be drawn onto internal layer so that inner layer of boundary layer have big momentum, velocity profile is fuller, delays the stream in downstream
Dynamic separation, is finally reached the purpose of flowing control, and Fig. 4 is the micro- broached-tooth design flow control principle schematic diagram of the embodiment of the present invention.
As shown in figure 4,1 indicates pedestal, 3 indicate electric hot plate, and 5 indicate upstream incoming flow, and 6 indicate heating hot-fluid, and 7 indicate undeformed micro- saw
Tooth, 8 indicate micro- sawtooth of temperature distortion, and 9 indicate that micro- sawtooth of deformation flows to vortex pair what downstream generated, and 10 indicate control front and back
Boundary layer in velocity profile comparison (dotted line：Before control；Solid line：After control).In addition, a large amount of studies have shown that wall surface
Micro-structure can not only control flow separation, and projecting height also has a significant impact the turbulence pulsation in boundary layer.When
When microstructure height is suitable with boundary layer thickness, it will the generation for promoting turbulent flow enhances the pulsation of turbulent flow；When microstructure height with
When boundary layer viscous sublayer thickness is suitable, and turbulence pulsation can be weakened.Therefore, the present invention changes micro- saw by control heating power
The projecting height of tooth may be implemented to sufficiently achieve the purpose of Active flow control to the Different Effects effect of turbulent boundary layer.
Each embodiment in this specification is described in a progressive manner, the highlights of each of the examples are with other
The difference of embodiment, the same or similar parts in each embodiment may refer to each other.
Used herein a specific example illustrates the principle and implementation of the invention, and above embodiments are said
It is bright to be merely used to help understand method and its core concept of the invention；At the same time, for those skilled in the art, foundation
Thought of the invention, there will be changes in the specific implementation manner and application range.In conclusion the content of the present specification is not
It is interpreted as limitation of the present invention.
Claims (7)
1. a kind of air flow system using the micro- broached-tooth design of thermo bimetal, which is characterized in that the system comprises：Base
Seat, the micro- Saw blade of thermo bimetal, electric hot plate and controller, the electric hot plate are embedded on the pedestal, and the thermo bimetal is micro-
Saw blade is close to the top of the electric hot plate, and the controller is connect with the electric hot plate, and the controller is described for controlling
Temperature, hot-fluid and the heating time of electric hot plate, air are flowed in the top of the micro- Saw blade of the thermo bimetal.
2. the air flow system according to claim 1 using the micro- broached-tooth design of thermo bimetal, which is characterized in that
The controller is computer.
3. the air flow system according to claim 1 using the micro- broached-tooth design of thermo bimetal, which is characterized in that
The pedestal uses duralumin material.
4. the air flow system according to claim 1 using the micro- broached-tooth design of thermo bimetal, which is characterized in that
The setting of the space widths such as thermo bimetal's micro- Saw blade.
5. the air flow system according to claim 1 using the micro- broached-tooth design of thermo bimetal, the double gold of heat
The thermal expansion coefficient for belonging to the metal of micro- Saw blade lower surface is greater than the thermal expansion coefficient of the micro- Saw blade upper surface of the thermo bimetal.
6. the air flow system according to claim 1 using the micro- broached-tooth design of thermo bimetal, the electric hot plate
It is adjusted for the height to the micro- Saw blade of the thermo bimetal, when electric hot plate heating, the micro- saw of thermo bimetal
The tooth tip of rack gear is upturned, and the height tilted can be higher by the height of pedestal place horizontal plane.
7. the air flow system according to claim 1 using the micro- broached-tooth design of thermo bimetal, the electric hot plate
When not heating, the height of horizontal plane where the horizontal plane where the tooth tip of the micro- Saw blade of thermo bimetal is not higher than the pedestal
Degree.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810730177.5A CN108910019B (en) | 2018-07-05 | 2018-07-05 | Air flow control system adopting thermal bimetal micro-sawtooth structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810730177.5A CN108910019B (en) | 2018-07-05 | 2018-07-05 | Air flow control system adopting thermal bimetal micro-sawtooth structure |
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| CN108910019A true CN108910019A (en) | 2018-11-30 |
| CN108910019B CN108910019B (en) | 2020-03-31 |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5598990A (en) * | 1994-12-15 | 1997-02-04 | University Of Kansas Center For Research Inc. | Supersonic vortex generator |
| US20040129838A1 (en) * | 2003-01-03 | 2004-07-08 | Lisy Frederick J. | Flow control device and method of controlling flow |
| EP1882818A1 (en) * | 2006-07-18 | 2008-01-30 | United Technologies Corporation | Serpentine microcircuit vortex turbulators for blade cooling |
| CN101213131A (en) * | 2005-06-30 | 2008-07-02 | 贝尔直升机特克斯特龙有限公司 | Retractable vortex generator |
| CN101318553A (en) * | 2008-05-28 | 2008-12-10 | 中国航天空气动力技术研究院 | Airfoil current control device |
| US20090020652A1 (en) * | 2007-07-20 | 2009-01-22 | Cessna Aircraft Company | Wing leading edge having vortex generators |
| CN102116177A (en) * | 2010-01-06 | 2011-07-06 | 通用电气公司 | Heat transfer enhancement in internal cavities of turbine engine airfoils |
| CN103711753A (en) * | 2013-12-31 | 2014-04-09 | 中国科学院工程热物理研究所 | Vortex generator structure for suppressing boundary layer separation under action of shock waves |
-
2018
- 2018-07-05 CN CN201810730177.5A patent/CN108910019B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5598990A (en) * | 1994-12-15 | 1997-02-04 | University Of Kansas Center For Research Inc. | Supersonic vortex generator |
| US20040129838A1 (en) * | 2003-01-03 | 2004-07-08 | Lisy Frederick J. | Flow control device and method of controlling flow |
| CN101213131A (en) * | 2005-06-30 | 2008-07-02 | 贝尔直升机特克斯特龙有限公司 | Retractable vortex generator |
| EP1882818A1 (en) * | 2006-07-18 | 2008-01-30 | United Technologies Corporation | Serpentine microcircuit vortex turbulators for blade cooling |
| US20090020652A1 (en) * | 2007-07-20 | 2009-01-22 | Cessna Aircraft Company | Wing leading edge having vortex generators |
| CN101318553A (en) * | 2008-05-28 | 2008-12-10 | 中国航天空气动力技术研究院 | Airfoil current control device |
| CN102116177A (en) * | 2010-01-06 | 2011-07-06 | 通用电气公司 | Heat transfer enhancement in internal cavities of turbine engine airfoils |
| CN103711753A (en) * | 2013-12-31 | 2014-04-09 | 中国科学院工程热物理研究所 | Vortex generator structure for suppressing boundary layer separation under action of shock waves |
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| CN108910019B (en) | 2020-03-31 |
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