CN108357665A - A kind of imitative longitudinal dune pneumatic drag reduction divides shape micro-nano structure - Google Patents
A kind of imitative longitudinal dune pneumatic drag reduction divides shape micro-nano structure Download PDFInfo
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- CN108357665A CN108357665A CN201711485914.1A CN201711485914A CN108357665A CN 108357665 A CN108357665 A CN 108357665A CN 201711485914 A CN201711485914 A CN 201711485914A CN 108357665 A CN108357665 A CN 108357665A
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- longitudinal dune
- layer
- longitudinal
- dune
- drag reduction
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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
- B64C21/10—Influencing air flow over aircraft surfaces by affecting boundary layer flow using other surface properties, e.g. roughness
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64C—AEROPLANES; HELICOPTERS
- B64C3/00—Wings
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T50/00—Aeronautics or air transport
- Y02T50/10—Drag reduction
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- Engineering & Computer Science (AREA)
- Aviation & Aerospace Engineering (AREA)
- Mechanical Engineering (AREA)
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Abstract
The invention discloses a kind of imitative longitudinal dune pneumatic drag reductions to divide shape micro-nano structure, and in particular to a kind of imitative longitudinal dune pneumatic drag reduction for aircraft wing divides shape micro-nano structure, belongs to vehicle technology field.The structure includes (a) longitudinal dune fractal structure layer (b) substrate material layer, and the longitudinal dune fractal structure layer is the longitudinal dune structure of three layers or multilayer.First layer longitudinal dune structure is arranged in substrate material layer, and second layer longitudinal dune structure is arranged on first layer longitudinal dune structure, and so on storied placement forms the longitudinal dune structure.The present invention overcomes the simple disadvantages of existing its drag reduction structures of riblet drag reduction technology, improve its pneumatic drag reduction performance, and the imitative longitudinal dune pneumatic drag reduction point shape micro-nano structure proposed has the characteristics that resistance reducing performance is preferable.
Description
Technical field
The present invention relates to a kind of imitative longitudinal dune pneumatic drag reductions for aircraft wing to divide shape micro-nano structure, belongs to aircraft skill
Art field.
Background technology
In order to meet the performances such as the big carrying of aircraft, long voyage, low oil consumption, higher want just is proposed to pneumatic drag reduction
It asks.
Microstructure by changing big aircraft surfaces realizes pneumatic drag reduction, be different from it is traditional by changing aircraft gas
The important method of dynamic layout drag reduction.Since there is huge potential values to excavate for this method, recent domestic scholar couple
It is conducted extensive research.It is entitled with patent publication No. CN106585949A《A kind of bionical sharkskin drag reduction structures》With it is special
Sharp publication number CN105644770B is entitled《A kind of drag reduction method of the drag reduction wing of imitative sharkskin》For a series of special of representative
Profit, the riblet pneumatic drag reduction technology derived from sharkskin bionics fiber are considered very promising scheme by academia.But it is preceding
Its drag reduction structures based on sharkskin riblet drag reduction technology of people's research are relatively simple, limit its pneumatic drag reduction performance.Therefore, small
The potentiality of rib drag reduction technology have to be excavated, and pneumatic drag reduction performance needs to be further increased.
Invention content
The purpose of the present invention：For the disadvantage for overcoming existing its drag reduction structures of riblet drag reduction technology simple, it is pneumatic to improve it
Resistance reducing performance.It is considered that needing to find new model, and has the model of preferable pneumatic drag reduction performance, it should have
The feature of standby three aspects：It interacts with air, Reynolds number is big, has rib-like structure.Thus we have associated desert, and pass through
It crosses after largely investigating screening, dune area --- the featheriness longitudinal dune that we have selected China exclusive.Therefore, the present invention proposes
A kind of imitative longitudinal dune pneumatic drag reduction divides shape micro-nano structure, has the characteristics that resistance reducing performance is preferable.
Imitative longitudinal dune pneumatic drag reduction proposed by the present invention divides shape micro-nano structure, includes (a) longitudinal dune fractal structure layer (b) substrate material
The bed of material, the longitudinal dune fractal structure layer are the longitudinal dune structure of three layers or multilayer.First layer longitudinal dune structure is arranged in substrate material
On the bed of material, second layer longitudinal dune structure is arranged on first layer longitudinal dune structure, and so on storied placement forms the longitudinal dune
Structure.
Specifically, the first layer longitudinal dune structure in the longitudinal dune structure is characterized knot of the width at 20 to 30 microns
Structure, planform do not limit, and all longitudinal dune structures are parallel to each other along direction of extension, and the spacing between longitudinal dune structure is spy
Levy width 10 to 20 times, the height of longitudinal dune structure are 0.5 times to 1 times of its characteristic width；The arrangement side of longitudinal dune structure
Formula can be continuous (as shown in Figure 3)；Have a gap but gap arrangement point-blank (as shown in Figure 4)；Have gap but
Be gap arrangement not point-blank (as shown in Figure 5).The structure and size of second layer longitudinal dune structure, position relationship are
The scaled down of first layer longitudinal dune structure, the structure and size of third layer longitudinal dune structure, position relationship are second layer sand
The scaled down of ridge structure, and so on, it forms longitudinal dune structure and divides shape micro-nano structure.
Substrate material layer upper surface can be smooth flat, can be that Non-smooth surface of the roughness in Ra3.2-Ra6.3 is flat
Face can be the waved surface of bending degree within limits.
In the present invention, metal, inorganic non-metallic material, polymer material can be used to prepare in above-mentioned two structure sheaf,
Metal material such as aluminium, copper, steel etc. and its alloy material, inorganic non-metallic material such as glass, ceramics etc., polymer material is such as
PDMS (dimethyl silicone polymer), photoresist etc..
The beneficial effects of the invention are as follows：When incoming is vortexed in the shape of a spiral passes through aerofoil, have part it is big flow to whirlpool with
The top end of imitative longitudinal dune pneumatic drag reduction point shape micro-nano structure collides, to be cut into the micro cyclone reversely detached respectively,
The vorticity directions of these micro cyclones with the former direction for flowing to vortex on the contrary, so as to form part vortex bucking block, therefore cut
It is weak it is original flow to vortex, reach drag-reduction effect.As shown in Figure 1.Big vortex is formed by stacking by the whirlpool of various scales,
The longitudinal dune structure of multilayer can remove broken vortex from respective scale in imitative longitudinal dune pneumatic drag reduction point shape micro-nano structure, and continue
The broken micro cyclone of broken maelstrom is farthest reduced inside and outside dynamic near aerofoil to realize graded crushing vortex
Amount exchanges, and postpones Turbulence-bursting, reduces frictional resistance and pressure drag.As shown in Figure 2.
Description of the drawings
Fig. 1 is that imitative longitudinal dune point shape micro-nano structure vortex offsets drag reduction mechanism schematic diagram
Fig. 2 is that whirlpool drag reduction mechanism schematic diagram is broken in imitative longitudinal dune point shape micro-nano structure classification
Fig. 3 is that case 1 is embodied in embodiment to imitate longitudinal dune point shape micro-nano structure axonometric drawing
Fig. 4 is that case 2 is embodied in embodiment to imitate longitudinal dune point shape micro-nano structure axonometric drawing
Fig. 5 is that case 3 is embodied in embodiment to imitate longitudinal dune point shape micro-nano structure axonometric drawing
Specific implementation method
The following example further describes and demonstrates the preferred embodiment in the scope of the invention.These implementations given
Example is merely illustrative, is not to be construed as limitation of the present invention.
Case 1 is embodied：
Longitudinal dune fractal structure layer and substrate material layer are made with PDMS (dimethyl silicone polymer), first layer longitudinal dune structure
The characteristic width of body is 20 microns, and the spacing between longitudinal dune structure is characterized 10 times of width, and the height of longitudinal dune structure is
The arrangement mode of 0.5 times of its characteristic width, longitudinal dune structure is continuous (as shown in Figure 3).Second layer longitudinal dune structure
Characteristic width is 1/10th of first layer characteristic width, remaining limitation is consistent with first layer.The spy of third layer longitudinal dune structure
/ 10th that width is second layer characteristic width are levied, remaining limitation is consistent with first layer.Substrate material layer upper surface is smooth
Plane.
Case 2 is embodied：
Longitudinal dune fractal structure layer and substrate material layer are made with Other substrate materials, and the feature of first layer longitudinal dune structure is wide
Degree is 30 microns, and the spacing between longitudinal dune structure is characterized 20 times of width, and the height of longitudinal dune structure is its characteristic width
1 times, the arrangement mode of longitudinal dune structure be have a gap but gap arrangement point-blank (as shown in Figure 4).Second
The characteristic width of layer longitudinal dune structure is 1/10th of first layer characteristic width, remaining limitation is consistent with first layer.Third layer
The characteristic width of longitudinal dune structure is 1/10th of second layer characteristic width, remaining limitation is consistent with first layer.Base material
Layer upper surface is smooth flat.
Case 3 is embodied：
Longitudinal dune fractal structure layer and substrate material layer are made with silica-base material, the characteristic width of first layer longitudinal dune structure
It it is 20 microns, the spacing between longitudinal dune structure is characterized 15 times of width, and the height of longitudinal dune structure is its characteristic width
0.8 times, the arrangement mode of longitudinal dune structure be have a gap but gap arrangement not point-blank (as shown in Figure 5).The
The characteristic width of two layers of longitudinal dune structure is 1/10th of first layer characteristic width, remaining limitation is consistent with first layer.Third
The characteristic width of layer longitudinal dune structure is 1/10th of second layer characteristic width, remaining limitation is consistent with first layer.Substrate material
Bed of material upper surface is smooth flat.
Claims (3)
1. imitative longitudinal dune pneumatic drag reduction divides shape micro-nano structure, which is characterized in that include (a) longitudinal dune fractal structure layer (b) base material
Layer, the longitudinal dune fractal structure layer are the longitudinal dune structure of three layers or multilayer；.First layer longitudinal dune structure is arranged in base material
On layer, second layer longitudinal dune structure is arranged on first layer longitudinal dune structure, and so on storied placement forms the longitudinal dune knot
Structure body；Specifically, the first layer longitudinal dune structure in the longitudinal dune structure is characterized structure of the width at 20 to 30 microns,
Planform does not limit, and all longitudinal dune structures are parallel to each other along direction of extension, and the spacing between longitudinal dune structure is characterized width
10 to 20 times of degree, the height of longitudinal dune structure are 0.5 times to 1 times of its characteristic width；The arrangement mode of longitudinal dune structure can
To be continuous, have gap but gap arrangement point-blank, have gap but gap arrangement not point-blank the
The structure and size of two layers of longitudinal dune structure, position relationship are the scaled down point shape of first layer longitudinal dune structure, third layer
The structure and size of longitudinal dune structure, position relationship are the scaled down point shape of second layer longitudinal dune structure, and so on,
It forms longitudinal dune structure and divides shape micro-nano structure.
2. imitative longitudinal dune pneumatic drag reduction divides shape micro-nano structure as described in claim 1, which is characterized in that in the substrate material layer
Surface be smooth flat or roughness Ra3.2-Ra6.3 Non-smooth surface plane or bending degree in a certain range
Within waved surface.
3. imitative longitudinal dune pneumatic drag reduction divides shape micro-nano structure as described in claim 1, which is characterized in that described two structure sheaf materials
Material is metal, inorganic non-metallic material or polymer material.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711485914.1A CN108357665B (en) | 2017-12-29 | 2017-12-29 | Sand ridge simulating pneumatic resistance reducing fractal micro-nano structure |
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| CN201711485914.1A CN108357665B (en) | 2017-12-29 | 2017-12-29 | Sand ridge simulating pneumatic resistance reducing fractal micro-nano structure |
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| CN108357665A true CN108357665A (en) | 2018-08-03 |
| CN108357665B CN108357665B (en) | 2021-03-23 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112550679A (en) * | 2020-12-18 | 2021-03-26 | 上海机电工程研究所 | Micro-nano resistance reduction structure for high-altitude high-speed environment |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050061221A1 (en) * | 2001-11-02 | 2005-03-24 | Mariusz Paszkowski | Superhydrophobic coating |
| US20060219143A1 (en) * | 2004-02-17 | 2006-10-05 | University Of Florida Research Foundation, Inc. | Surface topography for non-toxic bioadhesion control |
| US20100219296A1 (en) * | 2008-11-01 | 2010-09-02 | Alexander J. Shelman-Cohen | Reduced drag system for windmills, fans, propellers, airfoils, and hydrofoils |
| CN102424354A (en) * | 2011-08-23 | 2012-04-25 | 东南大学 | Rough surface for fractal structure |
| US20130083960A1 (en) * | 2011-09-30 | 2013-04-04 | Andrew Kostrzewski | Function-centric data system |
| KR20160101743A (en) * | 2015-02-17 | 2016-08-26 | 부산대학교 산학협력단 | Biomimetic ship coating and biomimetic ship out wall |
| CN107484450A (en) * | 2017-07-03 | 2017-12-19 | 昆明理工大学 | A kind of bionical multiple dimensioned convex closure structure based on fractal theory |
-
2017
- 2017-12-29 CN CN201711485914.1A patent/CN108357665B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050061221A1 (en) * | 2001-11-02 | 2005-03-24 | Mariusz Paszkowski | Superhydrophobic coating |
| US20060219143A1 (en) * | 2004-02-17 | 2006-10-05 | University Of Florida Research Foundation, Inc. | Surface topography for non-toxic bioadhesion control |
| US20100219296A1 (en) * | 2008-11-01 | 2010-09-02 | Alexander J. Shelman-Cohen | Reduced drag system for windmills, fans, propellers, airfoils, and hydrofoils |
| CN102424354A (en) * | 2011-08-23 | 2012-04-25 | 东南大学 | Rough surface for fractal structure |
| US20130083960A1 (en) * | 2011-09-30 | 2013-04-04 | Andrew Kostrzewski | Function-centric data system |
| KR20160101743A (en) * | 2015-02-17 | 2016-08-26 | 부산대학교 산학협력단 | Biomimetic ship coating and biomimetic ship out wall |
| CN107484450A (en) * | 2017-07-03 | 2017-12-19 | 昆明理工大学 | A kind of bionical multiple dimensioned convex closure structure based on fractal theory |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112550679A (en) * | 2020-12-18 | 2021-03-26 | 上海机电工程研究所 | Micro-nano resistance reduction structure for high-altitude high-speed environment |
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