CN206125209U - Car afterbody fairing based on radome fairing and coanda jet effect - Google Patents
Car afterbody fairing based on radome fairing and coanda jet effect Download PDFInfo
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- CN206125209U CN206125209U CN201621098993.1U CN201621098993U CN206125209U CN 206125209 U CN206125209 U CN 206125209U CN 201621098993 U CN201621098993 U CN 201621098993U CN 206125209 U CN206125209 U CN 206125209U
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- Prior art keywords
- air
- cover body
- jet
- drag reduction
- drag
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- 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
- Y02T10/00—Road transport of goods or passengers
- Y02T10/80—Technologies aiming to reduce greenhouse gasses emissions common to all road transportation technologies
- Y02T10/82—Elements for improving aerodynamics
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- Aerodynamic Tests, Hydrodynamic Tests, Wind Tunnels, And Water Tanks (AREA)
Abstract
The utility model discloses a car afterbody fairing based on radome fairing and coanda jet effect. It includes the drag reducting cowling body, air jet passageway and efflux lead -out hole, and goods railway carriage or compartment afterbody is provided with the drag reducting cowling body, and goods railway carriage or compartment lateral wall is provided with a plurality of air jet passageways, and drag reducting cowling body both sides are provided with efflux lead -out hole, and goods railway carriage or compartment front end windward side both sides all are provided with air jet channel entrance, and air jet channel entrance passes through air jet passageway and efflux lead -out hole UNICOM, the drag reducting cowling body for the cavity formula semi -cylindrical rectification drag reducting cowling body. The utility model discloses a reduction van aerodynamic drag, reducing fuel consumption, the economic nature of improvement, solve current van afterbody do not have the fairing or had fairing damping effect not notable, to the little problem of the economic nature of freight train contribution.
Description
Technical field
The present invention relates to the control field that flows, and in particular to subtracted based on the automobile tail of trouserss and Coanda jet effects
Resistance device.
Background technology
Highway transportation itself has the advantages that fast to go directly, since the nineties in 20th century, the highway transportation of China
Industry is developed rapidly.With the increasing substantially of auto industry level, the constantly improve of highway infrastructures and development, I
The current highway transportation volume of goods transported of state has accounted for more than 7 one-tenth in the comprehensive system of transport, so as to result in forwarding motor fuel consumption
Occupy very big ratio in the middle of China's oil consumption total amount, therefore the drag-reduction energy-saving problem of cargo vehicle becomes increasingly conspicuous, and further has
Effect reduces lorry air drag in the process of moving so as to reduce the important topic that unit gas mileage becomes current.
For large and medium-sized loading van (hereinafter collectively referred to as van), construction profile and other classes of its closing
Open type lorry is compared less pneumatic drag coefficient, but because it still has larger front face area, in higher speed row
Aerodynamic drag when sailing still accounts for very big proportion.Research shows：When speed reaches 70km/h, the aerodynamic drag of part vehicle
Just exceed the 50% of drag overall；The rear portion resistance of van accounts for major part；And pneumatic drag coefficient reduces by 30%, railway carriage or compartment
Formula lorry can reduce oil consumption 12%～13%.
Theory analysis shows that main resistance source is crack between driver's cabin and compartment in van traveling with engineering practice
Negative pressuren zone, the resistance that causes of the resistance that causes of gas shock and loading space rear portion wake flow vortex structure energy dissipation.At present, in engineering
In the measure that van carries out drag reduction is mainly had：Reduce compartment leading edge using kuppe is installed at the top of driver's cabin to separate
Area；Slow down gas shock resistance in the anterior installation flow spoiler of lorry；Flow deflector, baffle plate, fence etc. are installed in loading space afterbody to come
Destruction trailing vortex structure, postpones to separate so as to reach the effect of drag reduction.But, for the separated flow on a large scale of loading space afterbody is come
Say, flow deflector, baffle plate, fence control effect it is still not ideal enough, it is still desirable to find it is a kind of it is significantly more efficient can be significantly
The apparatus and method for reducing envelope rear portion resistance.
The content of the invention
To solve the above problems, the invention provides the automobile tail drag reduction based on trouserss and Coanda jet effects is filled
Put, in order to reduce van air drag, reduce oil consumption, improve economy, solve existing van afterbody without drag reduction
Device or existing damping device drag-reduction effect substantially, to lorry economy do not contribute little problem.
For achieving the above object, the technical scheme taken of the present invention is：Based on trouserss and the vapour of Coanda jet effects
Tailstock portion damping device, including drag reduction cover body, air-spray passage and jet leadout hole, loading space afterbody is provided with drag reduction cover body,
Cargo bed sidewall is provided with multiple air-spray passages, and drag reduction cover body both sides are provided with jet leadout hole, and loading space front end windward side
Both sides are provided with air-spray feeder connection, and air-spray feeder connection is joined by air-spray passage with jet leadout hole
It is logical；The height of drag reduction cover body is highly identical with loading space, and the width (i.e. the diameter of semicylinder) of drag reduction cover body accounts for loading space width
95%, the width of jet leadout hole accounts for the 1.2% of loading space width.
Preferably, described drag reduction cover body is cavity type semi-cylindrical rectification drag reduction cover body.
Preferably, the plane of described air-spray feeder connection is perpendicular to vehicle traveling direction.
Preferably, described jet leadout hole is arranged on the tangential direction of the semi-cylindrical Coanda curved surface of drag reduction cover body.
Preferably, described air-spray passage and outside atmosphere UNICOM.
Preferably, the air-spray passage is a continuous passage.
Preferably, the air-spray passage is made up of multiple discrete passages.
The invention has the advantages that：1st, it is notable by installing the streamlined drag-reduction effect of rear portion rectification cover body additional；2、
Coanda jet flow drag reductions can further enhance drag-reduction effect on the basis of streamlined drag reduction；3rd, streamlined drag reduction and jet subtract
Resistance need not consume additional energy while air drag is significantly reduced, therefore effectively reduce the unit mileage of van
Oil consumption；4th, the structure design of the symmetrical dual-jet in both sides also increases the lateral stability of lorry；5th, the cavity of afterbody rectification cover body
Structure further increases the cargo dead-weight of loading space, the space availability ratio of lorry is improved, with very good application prospect.
Description of the drawings
Fig. 1 is van archetype figure；
Fig. 2 is to install the van illustraton of model after afterbody Coanda effect rectification cover bodies additional；
Fig. 3 is truck compartment rear portion damping device synoptic chart；
Fig. 4 be using apparatus of the present invention after van side view；
Fig. 5 be using apparatus of the present invention after van rearview；
Fig. 6 be using apparatus of the present invention after van top view；
Fig. 7 is the sectional view of A-A positions in Fig. 4；
Fig. 8 is the Two-dimensional numerical simulation concept map of Section A-A in Fig. 4；
Fig. 9 is the two-dimensional flow field figure under lorry prototype structure external form；
Figure 10 is the two-dimensional flow field figure (now air-spray closing) under streamlined drag reduction state；
Figure 11 is the two-dimensional flow field figure (now having air-spray) under Coanda jet flow drag reduction states.
Specific embodiment
In order that objects and advantages of the present invention become more apparent, the present invention is carried out further with reference to embodiments
Describe in detail.It should be appreciated that specific embodiment described herein is not used to limit this only to explain the present invention
It is bright.
The automobile tail damping device based on trouserss and Coanda jet effects is embodiments provided, including subtracting
Resistance cover body 1, air-spray passage 2 and jet leadout hole 3, the afterbody of loading space 4 is provided with drag reduction cover body 1, and the side wall of loading space 4 is provided with many
Individual air-spray passage 2, the both sides of drag reduction cover body 1 are provided with jet leadout hole 3, and the front end windward side both sides of loading space 4 are provided with
Air-spray feeder connection, air-spray feeder connection is by air-spray passage 2 and the UNICOM of jet leadout hole 3, drag reduction cover body 1
Height it is highly identical with loading space 4, the width (i.e. the diameter of semicylinder) of drag reduction cover body 1 accounts for the 95% of the width of loading space 4, penetrates
Portal 3 width of conductance accounts for the 1.2% of the width of loading space 4.
Described drag reduction cover body 1 is cavity type semi-cylindrical rectification drag reduction cover body.
The plane of described air-spray feeder connection is perpendicular to vehicle traveling direction.
Described jet leadout hole 3 is arranged on the tangential direction of the semi-cylindrical Coanda curved surface of drag reduction cover body 1.
Described air-spray passage 2 and outside atmosphere UNICOM.
The air-spray passage 2 is a continuous passage.
The air-spray passage 2 is made up of multiple discrete passages.
Fig. 1 of this specific embodiment gives the archetype figure of van.It is proposed by the present invention that to install afterbody additional whole
The van illustraton of model of stream cover body is as shown in Figure 2.General view, side view, rearview, the top view of damping device is respectively as schemed
Shown in 3- Fig. 6.Loading space afterbody Coanda damping devices proposed by the invention are broadly divided into two parts：The semi-cylindrical of trailing edge
Rectification cover body and the air-spray passage for being distributed in loading space both sides.The loading space that is introduced as of envelope afterbody rectification cover body is provided more preferably
It is streamlined, according to aerodynamic ultimate principle, it can to a certain extent reduce rear air resistance, and the present invention claims
Be streamlined drag reduction.Additionally, the introduced air-spray feeder connection of the present invention be located at envelope front end windward side both sides (in order to
Numerical simulation, the present invention is facilitated not to provide the simulation of porch), pelvic inlet plane is perpendicular to lorry travel direction, efflux nozzle
Positioned at rectification cover body both sides tangential direction, therefore jet pipeline UNICOM spout and vehicle front air are flowing, and make to enter passage
The air-flow of entrance have with front flow the same stagnation pressure (i.e. fluid infinitesimal speed constant entropy it is static to corresponding pressure when zero,
I.e. fluid does the ability of useful work).When lorry is travelled, on the one hand, due to the installation of afterbody rectification cover body, loading space velocity wake region
Tentatively controlled, and reached the effect of certain streamlined drag reduction；On the other hand, impact of the air-flow to loading space windward side is made
With fluidic channel entrance is admitted air into, because passage is narrower, air pressure inside is higher, and jet is larger in the speed that spout sprays,
And jet is from after spout ejection, will attachment envelope afterbody Coanda curved surfaces (i.e. trouserss body surface face) flowing, and drive and around flow
Body followed by jet flow, it is suppressed that the flow separation and wake vortices at envelope rectification cover body rear comes off, so as to reduce
The negative pressuren zone of velocity wake region, substantially reduces the resistance coefficient of motor vehicle body, has reached the effect of flowing control drag reduction.The present invention
Referred to as Coanda jet flow drag reductions.It can be seen that, Coanda jet flow drag reductions further improve on the basis of streamlined drag reduction
Drag-reduction effect.
The damping device and method of the present invention has the characteristics that：First, by installing streamlined the subtracting of rear portion rectification cover body additional
Resistance effect is significant；2nd, Coanda jet flow drag reductions can further enhance drag-reduction effect on the basis of streamlined drag reduction；3rd, flow
Line style drag reduction and jet flow drag reduction need not consume additional energy while air drag is significantly reduced, therefore effectively reduce railway carriage or compartment
The unit gas mileage of formula lorry；4th, the structure design of the symmetrical dual-jet in both sides also increases the lateral stability of lorry；5th,
The cavity structure of afterbody rectification cover body further increases the cargo dead-weight of loading space, the space availability ratio of lorry is improved, with very
Good application prospect.
In order to simplify problem, facilitate numerical simulation, choosing the section A-A in Fig. 4 carries out the numerical simulation analysis of two dimension, A-
A sections are as shown in Figure 7.Fig. 8 is the numerical simulation profile concept map of Section A-A.The numerical value of three kinds of different conditions is carried out to lorry
Simulation, i.e. a：Original external form state (rectification cover body being not added with, without air-spray passage)；b：Streamlined drag reduction state (has whole
Stream cover body, but close air-spray passage)；c：Coanda jet flow drag reduction states (open air-spray and lead to again by existing rectification cover body
Road).
The result of numerical simulation shows, in lorry going straight ahead, the two-dimentional lorry resistance coefficient under a states is Cd=
0.1233；Increase two-dimentional lorry resistance coefficient under the b states after rectification cover body and be reduced to Cd=0.0906；On the basis of b states
The upper two-dimentional lorry resistance coefficient opened after air-spray passage under c states is further reduced to Cd=0.0207.
Flow field figure when Fig. 9-11 is respectively lorry straight-line travelling under three kinds of different calculating states, pressure cloud atlas in each figure
Reflect the pressure distribution around now lorry, and the size of envelope trailing edge trailing vortex then reflects the big of now lorry resistance indirectly
Little and its stability power.
As seen from Figure 9, the lorry rear of original configuration generates larger trailing vortex, and due to driving to leading edge to flow
The percussion of room, in leading edge larger zone of positive pressure is generated.As seen from Figure 10, Coanda drag reductions are installed in envelope afterbody
After cover body, due to overall streamlined more preferable, lift-off vortices breakdown slightly reduction, so that resistance coefficient is reduced to from 0.1233
0.0906, resistance reduces about 26%.As seen from Figure 11, open after air-spray passage, due to Coanda jets
Effect, rear vehicle changes around streamed, and wake flow separated region substantially further diminishes, i.e., envelope afterbody negative pressuren zone subtracts
It is little, therefore resistance coefficient has significantly been reduced to 0.0207, drag reduction efficiency reaches 83%.
It can thus be seen that the introducing of air-spray serves obviously drag-reduction effect.Streamline proposed by the present invention
The combination of two methods of type drag reduction and Coanda jet flow drag reduction causes the drag reduction efficiency of van to obtain significantly carrying
It is high.
More it should be noted that the air-spray in the present invention comes from the front in running car to flow, and jet
Stagnation pressure it is identical with the stagnation pressure that automobile external flows, therefore the present invention jet produce do not consume additional energy, economy is excellent；
The semicircle column type trouserss body of cavity design also provides extra cargo space for lorry, improves space availability ratio.
Embodiment 1：The present embodiment is a kind of dress that van drag reduction is carried out with afterbody rectification cover body and air-spray
Put and method.
The long 6.2m of large-scale closed lorry body, width 2.2m, high 2.1m that the embodiment of the present invention is adopted, and driver's cabin top peace
Equipped with kuppe, as shown in Figure 1.The damping device of the present invention is divided into two parts：That is the rectification cover body and loading space two of loading space afterbody
The air-spray passage of side, the trailing edge rectification cover body of installation is that a bottom surface radius is 1.045m, the cavity semicolumn of a height of 2.1m
Body；The air-spray feeder connection (numerical simulation for convenience, in accompanying drawing and be not drawn into) of cylinder both sides is located at lorry windward side
At both sides, perpendicular to lorry travel direction, nozzle is then located at the tangential direction of Coanda curved surfaces to pelvic inlet plane, fluidic channel with
Ambient atmosphere UNICOM, and groove width 0.03m, long 2.1m.The state of numerical simulation is：Lorry level straight trip speed Ma=0.085 is (i.e.
Speed per hour is about 106.2km/h), temperature be 26 DEG C.
The lorry model installed after damping device is as shown in Figure 2.Fig. 3 is synoptic chart, and Fig. 4 is side view, and A-A represents section
Position, Fig. 5 is the rearview of lorry, and Fig. 6 is the top view of lorry.Take Section A-A figure and obtain envelope lorry at the position
Streamlined drag reduction and Coanda jet flow drag reduction schematic diagrams, as shown in Figure 7.
For convenience numerical simulation, of the invention that Fig. 7 is carried out into remodeling optimization processing, by arranging channel interior overall pressure tatio
NPR=1 simulating the situation of Coanda jet flow drag reductions, as shown in Figure 8.
When lorry is travelled, there is trailing edge the rectification cover body of Coanda curved designs to have played the effect of streamlined drag reduction,
Drag reduction efficiency is tentatively improve, as shown in Figure 10；After lorry drives to certain speed, the passage of Coanda jets is opened, by
In the percussion of lorry leading edge air-flow, air-flow enters the air-spray passage positioned at windward side, due to passage it is narrower, internal gas
Pressure is higher, and air-flow " extrusion " trailing edge spout is formed high-speed jet by hyperbar, and adheres to the flowing of Coanda curved surfaces, until attached body
Flow and just separate with curved surface after a segment distance, significantly reduce afterbody separated region, reach the purpose of flowing control drag reduction.
Fig. 9 is the flow field figure without afterbody damping device, and resistance coefficient is 0.1233.Figure 10 applies merely streamlined drag reduction side
Method reaches preliminary control effect to trailing edge flowing, reduces resistance 26%.Figure 11 leads to install rectification cover body and opening air-spray
Two-dimensional flow field figure behind road, it can be seen that Coanda jets change the afterbody flowing of loading space, reduce trailing edge negative pressuren zone, because
This is further reduced pressure drag, and drag reduction efficiency reaches 83%.Therefore, the result of numerical simulation indicate the present invention for
The drag reduction of van has extraordinary effect.
The above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, under the premise without departing from the principles of the invention, some improvements and modifications can also be made, these improvements and modifications also should
It is considered as protection scope of the present invention.
Claims (7)
1. based on trouserss and the automobile tail damping device of Coanda jet effects, it is characterised in that including drag reduction cover body
(1), air-spray passage (2) and jet leadout hole (3), loading space (4) afterbody is provided with drag reduction cover body (1), and loading space (4) side wall sets
Multiple air-spray passages (2) are equipped with, drag reduction cover body (1) both sides are provided with jet leadout hole (3), and loading space (4) front end is windward
Face both sides are provided with air-spray feeder connection, and air-spray feeder connection is derived by air-spray passage (2) with jet
Hole (3) UNICOM；The height of drag reduction cover body (1) is highly identical with loading space (4), and the width of drag reduction cover body (1) accounts for loading space (4) width
95%, the width of jet leadout hole (3) accounts for the 1.2% of loading space (4) width.
2. according to claim 1 based on trouserss and the automobile tail damping device of Coanda jet effects, its feature
It is that described drag reduction cover body (1) is cavity type semi-cylindrical rectification drag reduction cover body.
3. according to claim 1 based on trouserss and the automobile tail damping device of Coanda jet effects, its feature
It is that the plane of described air-spray feeder connection is perpendicular to vehicle traveling direction.
4. according to claim 1 based on trouserss and the automobile tail damping device of Coanda jet effects, its feature
It is that described jet leadout hole (3) is arranged on the tangential direction of the semi-cylindrical Coanda curved surface of drag reduction cover body (1).
5. according to claim 1 based on trouserss and the automobile tail damping device of Coanda jet effects, it is described
Air-spray passage (2) and outside atmosphere UNICOM.
6. according to claim 1 based on trouserss and the automobile tail damping device of Coanda jet effects, its feature
It is that the air-spray passage (2) is a continuous passage.
7. according to claim 1 based on trouserss and the automobile tail damping device of Coanda jet effects, its feature
It is that the air-spray passage (2) is made up of multiple discrete passages.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621098993.1U CN206125209U (en) | 2016-09-30 | 2016-09-30 | Car afterbody fairing based on radome fairing and coanda jet effect |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621098993.1U CN206125209U (en) | 2016-09-30 | 2016-09-30 | Car afterbody fairing based on radome fairing and coanda jet effect |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206125209U true CN206125209U (en) | 2017-04-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621098993.1U Expired - Fee Related CN206125209U (en) | 2016-09-30 | 2016-09-30 | Car afterbody fairing based on radome fairing and coanda jet effect |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206125209U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106184429A (en) * | 2016-09-30 | 2016-12-07 | 西北工业大学 | Automobile tail damping device based on trousers and Coanda jet effect |
-
2016
- 2016-09-30 CN CN201621098993.1U patent/CN206125209U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106184429A (en) * | 2016-09-30 | 2016-12-07 | 西北工业大学 | Automobile tail damping device based on trousers and Coanda jet effect |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170426 Termination date: 20170930 |