CN109029016A - A kind of fin-tube type heat exchanger with sand dune shape eddy generator - Google Patents
A kind of fin-tube type heat exchanger with sand dune shape eddy generator Download PDFInfo
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- CN109029016A CN109029016A CN201710435908.9A CN201710435908A CN109029016A CN 109029016 A CN109029016 A CN 109029016A CN 201710435908 A CN201710435908 A CN 201710435908A CN 109029016 A CN109029016 A CN 109029016A
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- Prior art keywords
- fin
- heat exchanger
- eddy generator
- sand dune
- dune shape
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D1/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators
- F28D1/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid
- F28D1/04—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits
- F28D1/053—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being straight
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F1/00—Tubular elements; Assemblies of tubular elements
- F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
- F28F1/12—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element
- F28F1/24—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending transversely
- F28F1/32—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending transversely the means having portions engaging further tubular elements
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Geometry (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
The invention discloses a kind of fin-tube type heat exchangers with sand dune shape eddy generator, belong to technical field of heat exchangers, by the smooth fin of several groups and pass perpendicularly through the several groups set of heat exchange tubes of smooth fin at, cooling water is housed inside heat exchanger tube, several eddy generators are installed between heat exchanger tube, eddy generator is sand dune shape eddy generator, when air flows through the outside of heat exchanger tube, pass through heat exchanger tube, the heat transfer between air and cooling water is realized in the thermally conductive and convection current of sand dune shape eddy generator and smooth fin, sand dune shape eddy generator is made of windward side and leeward, the both ends intersection of windward side and leeward forms wing angle.Shape eddy generator in sand dune of the present invention has typical streamlined features, has lower flow resistance, enhances the heat dissipation effect of fin, can more effectively enhance incoming flow and exchange with the hot-fluid in boundary layer, promote the performance of heat exchanger.
Description
Technical field
The present invention relates to a kind of fin-tube type heat exchangers, change more particularly to a kind of fin-tube type with sand dune shape eddy generator
Hot device, belongs to technical field of heat exchangers.
Background technique
Heat exchanger as between a kind of different medium carry out heat exchange common processing equipment, be widely used in heating, power,
The industries such as refrigeration, air-conditioning, petroleum or even aviation, heat exchanger are not only to guarantee that engineering equipment runs well not in above-mentioned every profession and trade
The component that can or lack, and occupy important share in terms of energy source and power consumption, the research and development of energy-efficient heat and mass equipment
It is always one of heat exchange industry institute key technology to be solved with application.
It is the fin-tube type heat exchanger of air and water for working media, heat exchange property depends primarily on fin surface heat transfer
Coefficient and air-flow flow through consumed energy when heat exchanger, in order to improve pipe wing heat exchanger heat exchange property, are arranged in fin surface
Eddy generator is a kind of effective raising heat transfer measure, and the technical characteristics of this measure are to utilize eddy generator generation
Longitudinal shrinking turbulence come destroy with skiving fluid layer and thermal boundary layer, so that enhanced heat exchange is carried out in the direction for changing mainstream, and make resistance
Rise the smaller synthesis heat transfer characteristic to enhanced heat exchange device, there are two types of currently used eddy generators, and one is aerofoil profile whirlpool hairs
Raw device such as dalta wing, RECTANGULAR WINGS, tapered airfoil and curved wing, this eddy generator have since end can generate stronger secondary vortices
Have stronger enhanced heat transfer effect, but its shape and frictional resistance are larger, another kind be column type eddy generator such as square column, cylinder and
Cylindroid, this eddy generator have lower form drag, can generate stronger horseshoe vortex system, and then reinforcing and wall in root
The heat convection in face, but its augmentation of heat transfer effect is relatively poor.
Seek suitable eddy generator, heat exchanger flow resistance is reduced as far as while improving heat exchange property, has
There is important realistic meaning, the present invention proposes a kind of fin-tube type heat exchanger with sand dune shape eddy generator, strong taking into account heat transfer
There is lower form drag while changing efficiency, for improving heat exchanger effectiveness, energy-saving and emission-reduction have important meaning.
Summary of the invention
The main object of the present invention is to provide for a kind of fin-tube type heat exchanger with sand dune shape eddy generator, for mentioning
High air side heat exchange property reduces flow resistance, improves the compactedness of heat exchanger.
The purpose of the present invention can reach by using following technical solution:
A kind of fin-tube type heat exchanger with sand dune shape eddy generator by the parallel smooth fin of several groups and passes perpendicularly through
The parallel set of heat exchange tubes of the several groups of the smooth fin is at equipped with cooling water, the parallel institute of several groups inside the heat exchanger tube
It states and several eddy generators is installed between heat exchanger tube, the eddy generator is sand dune shape eddy generator, and sand dune shape whirlpool occurs
Device is mounted on the smooth fin, when air flows through the outside of the heat exchanger tube, passes through the heat exchanger tube, the sand dune shape
The heat transfer between air and cooling water is realized in the thermally conductive and convection current of eddy generator and the smooth fin；Sand dune shape whirlpool
Generator is made of windward side and leeward, and the both ends intersection of the windward side and the leeward forms wing angle, the sand
Mound shape eddy generator forms two bottom of slope angles to cuing open by center line, and the bottom of slope angle positioned at the windward side side is angle α windward, is located at
The bottom of slope angle of the leeward side is leeward angle beta；When air flows through the windward side, air stream is in the two adjacent light
An accelerated passage is formed between sliding fin and the windward side；When air flows through the leeward, air stream generation has
Three-dimensionality flow field produces a pair of anticlockwise longitudinal Vortex A identical with direction of flow；When air flows through the wing angle
When, another pair of anticlockwise longitudinal Vortex B is generated at the downstream at the wing angle.
Preferable scheme is that combination of the heat exchanger tube between round tube or square tube or both.
In any of the above-described scheme preferably, the material of the material of the sand dune shape eddy generator and the smooth fin
Metal material with high temperature resistant and heating conduction is used using the material of same material or the sand dune shape eddy generator.
In any of the above-described scheme preferably, using weldering between the sand dune shape eddy generator and the smooth fin
It connects, bond, being embedded in or the connection type of punching press connects.
In any of the above-described scheme preferably, the smooth fin is uniformly arranged in the sand dune shape eddy generator
On.
In any of the above-described scheme preferably, the heat exchanger tube be evenly distributed in smooth fin described in several groups it
Between.
In any of the above-described scheme preferably, the α of angle windward is 8 °~30 °, and the leeward angle beta is 25 °~50 °.
In any of the above-described scheme preferably, the sand dune shape eddy generator is crescent shape in the overlook direction of space.
In any of the above-described scheme preferably, the quantity pair of the quantity of the sand dune shape eddy generator and the heat exchanger tube
It answers.
In any of the above-described scheme preferably, the spacing H between the two adjacent smooth fins is less than described in 3 times
The height h1 of sand dune shape eddy generator.
Advantageous effects of the invention: the fin-tube type heat exchanger according to the invention with sand dune shape eddy generator, this
The fin-tube type heat exchanger with sand dune shape eddy generator provided is invented, sand dune shape eddy generator has typical streamlined spy
Sign has lower flow resistance under the conditions of reaching equalization thermal effect；Air can be in upper underwing when flowing through sand dune windward side
An accelerated passage is formed between piece and windward side, enhances the heat dissipation effect of fin, and the reinforcing of previous eddy generator
Heat-transfer effect is only embodied in the underwing on piece of eddy generator installation；When air flows through raw whirlpool device leeward and wing angle downstream,
Two pairs of longitudinal vortex structures rotated counterclockwise can be generated, can more effectively enhance incoming flow and be exchanged with the hot-fluid in boundary layer,
Promote the performance of heat exchanger.
Detailed description of the invention
Fig. 1 is the solid of a preferred embodiment of the fin-tube type heat exchanger according to the invention with sand dune shape eddy generator
Figure；
Fig. 2 is the side view of a preferred embodiment of the fin-tube type heat exchanger according to the invention with sand dune shape eddy generator
Figure, the embodiment can be embodiment identical with Fig. 1, be also possible to the embodiment different from Fig. 1；
Fig. 3 is the vertical view of a preferred embodiment of the fin-tube type heat exchanger according to the invention with sand dune shape eddy generator
Figure, the embodiment can be embodiment identical with Fig. 1 or Fig. 2, be also possible to the embodiment different from Fig. 1 or Fig. 2；
Fig. 4 is facing for a preferred embodiment of the fin-tube type heat exchanger according to the invention with sand dune shape eddy generator
Figure, the embodiment can be embodiment identical with Fig. 1 or Fig. 2 or Fig. 3, be also possible to the reality different from Fig. 1 or Fig. 2 or Fig. 3
Apply example；
Fig. 5 is the sand dune of a preferred embodiment of the fin-tube type heat exchanger according to the invention with sand dune shape eddy generator
Shape gives birth to whirlpool device structural schematic diagram, which can be embodiment identical with Fig. 1 or Fig. 2 or Fig. 3 or Fig. 4, be also possible to
Fig. 1 or Fig. 2 or Fig. 3 or Fig. 4 different embodiments；
Fig. 6 is the sand dune of a preferred embodiment of the fin-tube type heat exchanger according to the invention with sand dune shape eddy generator
Shape gives birth to whirlpool device side view, which can be embodiment identical with Fig. 1 or Fig. 2 or Fig. 3 or Fig. 4 or Fig. 5, be also possible to
Fig. 1 or Fig. 2 or Fig. 3 or Fig. 4 or Fig. 5 different embodiments；
Fig. 7 is the sand dune of a preferred embodiment of the fin-tube type heat exchanger according to the invention with sand dune shape eddy generator
The raw whirlpool device of shape is flowing to the velocity contour on direction, which can be and Fig. 1 or Fig. 2 or Fig. 3 or Fig. 4 or Fig. 5 or Fig. 6
Identical embodiment is also possible to the embodiment different from Fig. 1 or Fig. 2 or Fig. 3 or Fig. 4 or Fig. 5 or Fig. 6；
Fig. 8 is the sand dune of a preferred embodiment of the fin-tube type heat exchanger according to the invention with sand dune shape eddy generator
Motion pattern of the shape eddy generator on longitudinal cross-section, the embodiment can be with Fig. 1 or Fig. 2 or Fig. 3 or Fig. 4 or Fig. 5 or Fig. 6 or
The identical embodiment of Fig. 7, is also possible to the embodiment different from Fig. 1 or Fig. 2 or Fig. 3 or Fig. 4 or Fig. 5 or Fig. 6 or Fig. 7.
In figure: 1- heat exchanger tube, 2- eddy generator, the smooth fin of 3-, the windward side 11-, 12- leeward, 13- wing angle, 21- are vertical
To whirlpool A, 22- longitudinal Vortex B.
Specific embodiment
To make the more clear and clear technical solution of the present invention of those skilled in the art, below with reference to examples and drawings
The present invention is described in further detail, and embodiments of the present invention are not limited thereto.
As shown in Figure 1, Figure 2, provided in this embodiment a kind of with sand dune shape whirlpool shown in Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 7 and Fig. 8
The fin-tube type heat exchanger of generator is put down by the parallel smooth fin 3 of several groups and the several groups for passing perpendicularly through the smooth fin 3
Capable heat exchanger tube 1 forms, and cooling water is housed inside the heat exchanger tube 1, if being equipped between the heat exchanger tube 1 of several groups in parallel
Dry eddy generator 2, the eddy generator 2 are sand dune shape eddy generator, and the sand dune shape eddy generator is mounted on the smooth wing
On piece 3, when air flows through the outside of the heat exchanger tube 1, pass through the heat exchanger tube 1, the sand dune shape eddy generator and described
The heat transfer between air and cooling water is realized in the thermally conductive and convection current of smooth fin 3；The sand dune shape eddy generator is by windward
Face 11 and leeward 12 form, and the both ends intersection of the windward side 11 and the leeward 12 forms wing angle 13, the sand dune
Shape eddy generator forms two bottom of slope angles to cuing open by center line, and the bottom of slope angle positioned at 11 side of windward side is angle α windward, is located at
The bottom of slope angle of 12 side of leeward is leeward angle beta；When air flows through the windward side 11, air stream is in two adjacent institutes
State one accelerated passage of formation between smooth fin 3 and the windward side 11；When air flows through the leeward 12, air stream
Generating has three-dimensionality flow field, produces a pair of anticlockwise longitudinal Vortex A21 identical with direction of flow；Work as air stream
When through the wing angle 13, another pair of anticlockwise longitudinal Vortex B22 is generated at the downstream at the wing angle 13.
Further, in the present embodiment, heat exchanger tube 1 is not limited in round tube, is also possible to square tube either other shapes
The material of radiator itself can be used in the material of the heat exchange pipeline of shape, sand dune shape eddy generator, other can also be used and is easy to cut
The metal material for cutting and installing, the resistance to mild heating conduction of material should meet the requirement of radiator operating condition.
Further, in the present embodiment, as shown in Figure 1, Figure 2, Figure 3 and Figure 4, the heat exchanger tube 1 is round tube or square tube
Or both between combination, the material of the material of the sand dune shape eddy generator and the smooth fin 3 uses same material,
Or the material of the sand dune shape eddy generator uses the metal material with high temperature resistant and heating conduction.
Further, in the present embodiment, as shown in Figure 1, Figure 2, Figure 3 and Figure 4, the sand dune shape eddy generator with it is described
Using the connection type connection of welding, bonding, insertion or punching press between smooth fin 3, the sand dune shape eddy generator is uniform
Setting on the smooth fin 3, the heat exchanger tube 1 is evenly distributed between smooth fin 3 described in several groups.
Further, in the present embodiment, as shown in figure 5, the α of angle windward is 8 °~30 °, the leeward angle beta is 25 °
~50 °.
Further, in the present embodiment, shown in as shown in Figure 1, Figure 2, Fig. 3, Fig. 4 and Fig. 5, the sand dune shape eddy generator exists
It is crescent shape in the overlook direction of space, the quantity of the sand dune shape eddy generator is corresponding with the quantity of the heat exchanger tube 1.
Further, in the present embodiment, as shown in Figure 2 and Figure 6, in order to guarantee the sand dune shape eddy generator to incoming flow
Acceleration effect, the height of the sand dune shape eddy generator of the spacing H less than 3 times between the two adjacent smooth fins 3
The quantity of h1, the smooth fin 3 can be one or more, and only when fin number is more than or equal to two, eddy generator is
Have the effect of to upper fin enhanced heat exchange.
Further, in the present embodiment, as shown in fig. 7, the VELOCITY DISTRIBUTION data are obtained by PIV experiment, from figure
It can be seen that incoming flow starts to accelerate at generator highest point, maximum speed can reach 2.5 times of mainstream speed, and mainstream speed is
0.1, the disturbance using this acceleration effect to upper fin fluid boundary layer enhances the blending of incoming flow and boundary layer fluid, by force
The heat transfer effect of fin in change.
Further, in the present embodiment, as shown in figure 8, the VELOCITY DISTRIBUTION data are obtained by PIV experiment, from figure
It can be seen that there are the longitudinal Vortex A21 that these two pair rotates counterclockwise in eddy generator flow field in longitudinal section, wherein longitudinal
Pressure difference before and after when whirlpool A21 flows through eddy generator by fluid is found out, and this spiral structure has biggish scale, can be destroyed and be filled
Distribute the boundary layer of exhibition, the confusion degree of enhancing fluid flowing can greatly improve the coefficient of heat transfer；In addition, in eddy generator one
To under the interaction at wing angle and incoming flow, a pair of of direction of rotation opposing longitudinal whirlpool B22 is also created, mainstream and underwing are enhanced
Interaction between piece, further improves heat exchanger performance.
The present embodiment with by the parallel smooth fin of several groups and pass perpendicularly through the set of heat exchange tubes of fin at fin-tube type change
For hot device, the eddy generator with sand dune shape is installed between heat exchanger tube, which is in the overlook direction of space
Reveal half moon-shaped shape, from the point of view of space topological form, which includes windward side and leeward, wherein
α size in angle is about between 8 °~30 ° windward, and leeward angle beta size is about at 25 °~50 ° or so, while the adjoint appearance at leeward
Two wing angles stretched along downstream.Air can form one when flowing through eddy generator windward side between upper and lower fin and windward side
Accelerated passage, the air stream after accelerating can generate impact to upper fin surface, be thinned the fluid boundary layer of fin, increase
The strong blending of incoming flow and boundary layer fluid, enhances the heat transfer effect of fin, when air flows through leeward, can generate tool
There is very strong three-dimensionality flow field, in front and back under the action of pressure difference, produces a pair of counter clockwise direction rotation identical with direction of flow
Vortex structure, this spiral structure can destroy fully developed boundary layer, and the confusion degree of enhancing fluid flowing can be mentioned substantially
The high coefficient of heat transfer also can produce another pair of counterclockwise when air flows through the wing angle in leeward downstream at the downstream at wing angle
Longitudinal vortex structure in direction further enhances the interaction between mainstream and lower fin, enhances heat exchange property.
In conclusion in the present embodiment, according to the fin-tube type heat exchanger with sand dune shape eddy generator of the present embodiment,
Fin-tube type heat exchanger provided in this embodiment with sand dune shape eddy generator, sand dune shape eddy generator have typical streamlined
Feature has lower flow resistance under the conditions of reaching equalization thermal effect；Air can be upper and lower when flowing through sand dune windward side
An accelerated passage is formed between fin and windward side, enhances the heat dissipation effect of fin, and previous eddy generator is strong
Change the underwing on piece that heat-transfer effect is only embodied in eddy generator installation；Air flows through raw whirlpool device leeward and wing angle downstream
When, two pairs of longitudinal vortex structures rotated counterclockwise can be generated, the hot-fluid that can more effectively enhance incoming flow and boundary layer is handed over
It changes, promotes the performance of heat exchanger.
The above, further embodiment only of the present invention, but scope of protection of the present invention is not limited thereto, and it is any
Within the scope of the present disclosure, according to the technique and scheme of the present invention and its design adds those familiar with the art
With equivalent substitution or change, protection scope of the present invention is belonged to.
Claims (10)
1. a kind of fin-tube type heat exchanger with sand dune shape eddy generator, it is characterised in that: by the parallel smooth fin of several groups
(3) heat exchanger tube (1) parallel with the several groups for passing perpendicularly through the smooth fin (3) composition, the heat exchanger tube (1) is internal to be equipped with
Cooling water is equipped with several eddy generators (2) between the parallel heat exchanger tube (1) of several groups, and the eddy generator (2) is sand
Mound shape eddy generator, the sand dune shape eddy generator are mounted on the smooth fin (3), when air flows through the heat exchanger tube
(1) when outside, pass through the thermally conductive and convection current of the heat exchanger tube (1), the sand dune shape eddy generator and the smooth fin (3)
Realize the heat transfer between air and cooling water；The sand dune shape eddy generator is by windward side (11) and leeward (12) group
At the both ends intersection of the windward side (11) and the leeward (12) forms wing angle (13), the sand dune shape eddy generator
Two bottom of slope angles are formed to cuing open by center line, and the bottom of slope angle for being located at the windward side (11) side is angle α windward, is located at described leeward
The bottom of slope angle of face (12) side is leeward angle beta；When air flows through the windward side (11), air stream is in the two adjacent light
An accelerated passage is formed between sliding fin (3) and the windward side (11)；When air flows through the leeward (12), air
Miscarriage is raw to have three-dimensionality flow field, produces a pair of anticlockwise longitudinal Vortex A (21) identical with direction of flow；Work as sky
When air-flow is through wing angle (13), another pair of anticlockwise longitudinal Vortex B is generated at the downstream of the wing angle (13)
(22)。
2. a kind of fin-tube type heat exchanger with sand dune shape eddy generator according to claim 1, it is characterised in that: described
Combination of the heat exchanger tube (1) between round tube or square tube or both.
3. a kind of fin-tube type heat exchanger with sand dune shape eddy generator according to claim 1, it is characterised in that: described
The material of sand dune shape eddy generator and the material of the smooth fin (3) are occurred using same material or sand dune shape whirlpool
The material of device uses the metal material with high temperature resistant and heating conduction.
4. a kind of fin-tube type heat exchanger with sand dune shape eddy generator according to claim 1, it is characterised in that: described
It is connect between sand dune shape eddy generator and the smooth fin (3) using the connection type of welding, bonding, insertion or punching press.
5. a kind of fin-tube type heat exchanger with sand dune shape eddy generator according to claim 1, it is characterised in that: described
Sand dune shape eddy generator is uniformly arranged on the smooth fin (3).
6. a kind of fin-tube type heat exchanger with sand dune shape eddy generator according to claim 1, it is characterised in that: described
Heat exchanger tube (1) is evenly distributed between smooth fin (3) described in several groups.
7. a kind of fin-tube type heat exchanger with sand dune shape eddy generator according to claim 1, it is characterised in that: described
Angle α is 8 °~30 ° windward, and the leeward angle beta is 25 °~50 °.
8. a kind of fin-tube type heat exchanger with sand dune shape eddy generator according to claim 1, it is characterised in that: described
Sand dune shape eddy generator is crescent shape in the overlook direction of space.
9. a kind of fin-tube type heat exchanger with sand dune shape eddy generator according to claim 1, it is characterised in that: described
The quantity of sand dune shape eddy generator is corresponding with the quantity of the heat exchanger tube (1).
10. a kind of fin-tube type heat exchanger with sand dune shape eddy generator according to claim 1, it is characterised in that: two
The height h1 of the sand dune shape eddy generator of the spacing H less than 3 times between the adjacent smooth fin (3).
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109210962A (en) * | 2018-07-02 | 2019-01-15 | 江苏理工学院 | A kind of fin-tube type heat exchanger with sand dune shape eddy generator |
| CN109724774A (en) * | 2019-02-27 | 2019-05-07 | 吉林大学 | The general board-like finned flow Mobile Test Set of one kind and test method |
| CN112833048A (en) * | 2020-12-30 | 2021-05-25 | 广东美的白色家电技术创新中心有限公司 | Volute, fan and cigarette machine |
| CN113834129A (en) * | 2020-06-08 | 2021-12-24 | 青岛海信日立空调系统有限公司 | Air conditioner |
| WO2022089538A1 (en) * | 2020-10-30 | 2022-05-05 | 上海市政工程设计研究总院（集团）有限公司 | Sludge fluidized bed drying machine |
| CN114521691A (en) * | 2022-01-25 | 2022-05-24 | 李宁（中国）体育用品有限公司 | Streamline vortex generator with drag reduction function and garment |
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Application publication date: 20181218 |