CN104613009B - Reversible axial flow fan blade with air blowing grooves - Google Patents
Reversible axial flow fan blade with air blowing grooves Download PDFInfo
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- CN104613009B CN104613009B CN201510046696.6A CN201510046696A CN104613009B CN 104613009 B CN104613009 B CN 104613009B CN 201510046696 A CN201510046696 A CN 201510046696A CN 104613009 B CN104613009 B CN 104613009B
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- blade
- grooves
- suction surface
- air blowing
- reversible
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/26—Rotors specially for elastic fluids
- F04D29/32—Rotors specially for elastic fluids for axial flow pumps
- F04D29/38—Blades
- F04D29/388—Blades characterised by construction
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention discloses a reversible axial flow fan blade with air blowing grooves. The reversible axial flow fan blade with the air blowing grooves comprises a blade body which is composed of a blade handle and a blade body part, wherein the at least two air blowing grooves are formed in the top of the blade body part in the circumferential direction and are evenly distributed on the surface of the top of the blade, and a wing type pressure surface of the top of the blade and a suction surface are communicated through the air blowing grooves. According to the symmetrical grooves, airflow flowing from the pressure surface to the suction surface is formed in the grooves by means of the high pressure difference between the pressure surface and the suction surface, and vortexes on the suction surface are blown away in the flowing direction. According to the reversible axial flow fan blade with the air blowing grooves, the grooves are formed in the top of the blade body part, in this way, the vortex structure of the suction force on the top of the blade can be maintained, the flowing intensity of loop flow on an inlet and the flowing intensity of the axial vortexes of the suction surface of the top of the blade are reduced, vortex loss and the friction loss are reduced, the total-pressure efficiency of a fan is improved, energy is saved, and consumption is reduced. It is proved through computer numerical values that the total-pressure efficiency of the reversible axial flow fan can be improved by 3%-5%, and the manufacturing cost is reduced by about 10%.
Description
Technical field
The invention belongs to fluid machinery technical field, is related to a kind of reversible Axial Fan Blades with blowing groove.
Background technology
Reversible propeller fan is referred to：The ventilation blower of the blade wheel structure of symmetrical or antisymmetry aerofoil profile is installed, is turned in design
Under speed, no matter rotate forward or reversely rotate ventilation blower and there is identical air dynamic behaviour, i.e., with identical pressure, stream
The aerodynamic parameters such as amount, power, efficiency.This special characteristics of reversible ventilation fan causes the propeller fan phase with equal machine number
Total head, flow and total pressure efficiency than, reversible fan is all very low, and power consumption is very big.In order to improve the gas of reversible ventilation fan
Dynamic performance, now widely used reversible propeller fan overwhelming majority vane tip both sides are both provided with anti-surge ring device.
According to the design theory of propeller fan, the symmetrical airfoil or antisymmetry aerofoil profile that reversible ventilation fan is adopted does not have
Acting ability, i.e., axial plane flowing when being rotated using the impeller of this blade shape does not have the ability for producing pressure and flow.It is real
Why the reversible axial fan impeller in border can do work, and be exactly the relative of leaf top inlet side suction surface in blade path
In flowing, air-flow there are a very big spiral structure.The presence of this spiral structure causes the air-flow for entering impeller from partly
The little radial position in footpath enters impeller, and from the big radial position of radius impeller is left, so as to obtain the through-flow section of runner increase and
The lifting of static pressure, further raises gas-static while centrifugal inertial force power also assists in acting.This spiral structure is deposited
Symmetrical or antisymmetry axle stream blade profile ventilation blower is caused the meridian plane acceleration effect of flowing is defined so as to be provided with acting ability.
In order to maintain this stable spiral structure, generally reversible propeller fan is provided with anti-in the casing position of vane tip both sides
Surge ring.The presence of anti-surge ring improves the acting ability of reversible ventilation fan, but generates additional energy loss therewith
With increasing considerably for manufacturing cost.
The content of the invention
It is an object of the invention to solve above-mentioned the problems of the prior art, there is provided a kind of reversible axle stream with blowing groove
Ventilating vane, present invention eliminates the two-way anti-surge ring device of vane tip both sides, simplifies the structure of ventilation blower, except big
The aditional energy loss produced due to anti-surge ring device can also be further reduced outside amplitude reduction manufacturing cost.
To achieve these goals, the technical solution adopted in the present invention is：
Reversible Axial Fan Blades with blowing groove, including the blade being made up of petiole and blade；The top of blade
At least two blowing grooves are along the circumferential direction opened up, blowing groove is distributed on leaf top surface, by vane tip airfoil pressure side and suction
Face UNICOM.
The blowing groove is the groove of some symmetrical structures.
Radius of the blowing groove depth radially less than or equal to vortex yardstick on vane tip suction surface.
The width of the blowing groove is 2.5～10mm, and depth is 10～50mm.
The center line of the blowing groove width is in the same direction with the circumferencial direction of blower fan rotation, and each blowing groove width
Center line between spacing be 5～30mm.
2～10 blowing grooves are offered at the top of the blade.
Compared with prior art, the invention has the advantages that：
The present invention along the circumferential direction opens up some blowing grooves, the groove profit of this symmetrical structure at the top of the blade of blade
The air-flow from pressure face to suction surface is formed in groove with the higher pressure differential of pressure face, suction surface, by the whirlpool of suction surface
Stream streamwise blows down.The groove that opens up at the top of blade of the present invention be able to maintain that the spiral structure of vane tip suction surface but
Reduce the flow strength of import circulation and leaf top suction surface axial vortex and reduce eddy current loss and friction loss raising so as to reach
The total pressure efficiency of ventilation blower, reaches energy-saving purpose.Present invention eliminates the two-way anti-surge ring dress of vane tip both sides
Put, simplify the structure of ventilation blower, can also further reduce due to anti-surge ring device in addition to manufacturing cost is greatly lowered
The aditional energy loss of generation.Computer Numerical Simulation shows：Reversible propeller fan total pressure efficiency can improve 3～5%, system
Cause this reduction by 10% or so.
Description of the drawings
Fig. 1 embodiment of the present invention 1 has the reversible propeller fan antisymmetry blade three-view diagram of 3 leaf top blast air drains, wherein
Fig. 1 (a) is front view, and Fig. 1 (b) is side view, and Fig. 1 (c) is top view；
The axonometric drawing of Fig. 2 blades of the present invention；
Speed vector figure near blade surfaces of the Fig. 3 without leaf top blast air drain and air inlet side casing；
Fig. 4 is local velocity's polar plot near the blade surface without leaf top blast air drain and air inlet side casing；
Fig. 5 is out speed vector figure near the blade surface and air inlet side casing of leaf top blast air drain；
Fig. 6 is out local velocity's polar plot near the blade surface and air inlet side casing of leaf top blast air drain；
Fig. 7 is the reversible propeller fan antisymmetry blade three-view diagram that the embodiment of the present invention 2 has 4 leaf top blast air drains, its
Middle Fig. 7 (a) is front view, and Fig. 7 (b) is side view, and Fig. 7 (c) is top view；
Fig. 8 is the reversible propeller fan antisymmetry blade three-view diagram that the embodiment of the present invention 3 has 10 leaf top blast air drains, its
Middle Fig. 8 (a) is front view, and Fig. 8 (b) is side view, and Fig. 8 (c) is top view.
Wherein：1 is petiole；2 is blade；3 is blowing groove；4 is leaf top suction surface axial vortex；5 is import circulation.
Specific embodiment
Below in conjunction with the accompanying drawings the present invention will be further described in detail：
Referring to Fig. 1 and Fig. 2, the present invention includes the blade being made up of petiole 1 and blade 2, and the top of blade 2 is along the circumferential direction
2～10 blowing grooves 3 are opened up, blowing groove 3 is distributed on leaf top surface, by vane tip airfoil pressure side and suction surface UNICOM.Blow
Air drain 3 is the groove of some symmetrical structures.Radius of the depth radially of blowing groove 3 less than or equal to vortex yardstick on power face.Blow
The width of air drain 3 is 2.5～10mm, and depth is 10～50mm.The circumference that the center line of the width of blowing groove 3 rotates with blower fan
Direction is in the same direction.
The principle of the present invention：
Due to the constraint of cylindrical casing barrel, the partial blade in the annular region of vane tip inlet side does not have son
Noon section acceleration capacity, that is, there is no acting and static pressure liter ability is obtained.Therefore, air-flow also just cannot be from vane tip
This subregion enters blade path, so as to generate and impeller rotation into the inlet side induction before the top of impeller in air-flow
Direction identical import circulation and leaf top suction surface axial vortex fluidal texture.The radial dimension of this annular region is according to reversible logical
Fan design total head it is different and different.The presence of import circulation is that reversible propeller fan leaf top is necessary without inlet air conditions institute
, also results in the presence of leaf top suction surface axial vortex and lose with significant energy without inlet air conditions and make an uproar with pneumatic
Sound.
As shown in figure 1, in order to not only keep the presence of leaf top suction surface axial vortex structure but also weaken leaf top suction surface axial direction
The intensity of vortex, reduces eddy current loss and the reversible propeller fan total pressure efficiency of wall friction loss raising, reduces whirlpool to reach
The raw aerodynamic noise of miscarriage.The present invention takes vane tip along the circumferential direction to open and takes leaf top blast air drain method by leaf top profile pressure
Face and suction surface UNICOM.The groove of this symmetrical structure using the higher pressure differential of pressure face, suction surface formed in groove from
Pressure face blows down the vortex streamwise of suction surface to the air-flow of suction surface.In order to ensure to improve aerodynamic performance
Again blade stiffness is not affected, general fluting depth radially is less than or equal to the radius value of vortex yardstick on power face.Fluting
Depending on vane tip chord length, groove should be unimpeded to ensure the flowing in groove with enough width, and being typically based on can for quantity
The size of back draught machine physical dimension, it is circumferential symmetrically to open 2～10 grooves, the width of blowing groove by vane tip chord length
Spend for 2.5～10mm, the depth of blowing groove is 10～50mm.Because groove structure is geometrically symmetric, therefore the no matter side of rotation
To how having can guarantee that the complete reversible of aeroperformance.
The employing of reversible propeller fan leaf top blast tank structure, except reducing import circulation strength and leaf top suction surface axle
Improve so as to reduce flow losses outside the flow efficiency of reversible ventilation fan to vortex intensity, also eliminate leaf top casing both sides
Anti-surge ring, simplify housing construction, manufacturing cost is greatly lowered.Computer Numerical Simulation shows：Reversible axle circulation wind
Machine total pressure efficiency can improve 3～5%, and manufacturing cost reduces by 10% or so.
Several specific embodiments of the present invention are set forth below：
Embodiment 1
The present embodiment is the reversible Axial Fan Blades with blowing groove, including petiole 1, blade 2 and blowing groove 3.
Reversible Axial Fan Blades are used for the reversible propeller fan of diameter D=2m, the reversible axial fan impeller
Working speed n=980r.m.p, design discharge Q=60m3/ s, full design pressure P=950Pa, impeller blade quantity Z=10, blade
Top chord length L=250mm, hub ratio k=0.45.Leaf top is installed by angle betaan=15 °.
Backed down 3 blowing grooves 3 in the leaf of the reversible Axial Fan Blades, the center line of each blowing groove width with
The circumferencial direction of blower fan rotation is in the same direction.Leaf top is located at the top of blade 2.In the present embodiment, blowing groove has 3, the width of each blowing groove
Spend for 5.5mm, the depth of each blowing groove is 25mm.
Each blowing groove is distributed on leaf top surface by circumferential Central Symmetry.In the present embodiment, 3 blowing grooves are distributed on leaf top
Surface, and the blowing groove of centre is made positioned at the center of aerofoil profile at the blade and blade top surface, other two blowing groove is symmetrical to be divided
Spacing of the cloth between the both sides of middle blowing groove, the center line of each blowing groove width is 20.5mm.
The petiole 1 of reversible Axial Fan Blades and the structure of blade 2 adopt prior art, install by the blade of design
Angle is fixed on wheel hub.
To verify the effect of the present embodiment, same aerodynamic parameter, geometric parameter, the number of blade and working speed leaf is not opened into
As a comparison object has carried out detailed computer numerical flow analysis to the blade of top blast air drain.
Fig. 3 and Fig. 5 is the reversible propeller fan inlet side front view of 2 meters of diameter.Depict in view under the same terms,
VELOCITY DISTRIBUTION on blade suction surface and air inlet catchment port.The VELOCITY DISTRIBUTION of blade surface is represented using relative velocity vector, entered
Absolute velocity vector representation, impeller is adopted to rotate in the direction of the clock near gas catchment port and casing.
In Fig. 4 and Fig. 6, sets forth out on leaf top blast air drain and Kai Ye top blast air drains rear blade top suction surface
Axial vortex and the import circulation partial enlargement speed vector figure by the suction surface axial vortex induction of leaf top.In Fig. 4, simulate not
Velocity near the blade surface and air inlet side casing of leaf top blast air drain is opened, in Fig. 6, the leaf for being provided with leaf top blast air drain is simulated
Axial vortex on the suction surface of piece top and the import circulation 5 induced by leaf top suction surface axial vortex 4 and blade surface and
Velocity near air inlet side casing.
Leaf top suction surface axial vortex 4 referred to indicated by Fig. 4 the latter half 4, being represented with velocity on blade
The spiral structure of gas.Import circulation 5 refer to that Fig. 4 top halfs 5 indicate positioned at blade air inlet front portion air inlet catchment port and machine
The air-flow that casket nearby and with wheel rotation direction identical rotates at a high speed.
For the effect of the checking present invention, numerical simulation is carried out to the present embodiment.The result of numerical simulation shows：
1. the result of Fig. 4 and Fig. 6 is compared：Under identical backpressure condition, open on the vane tip suction surface of leaf top blast air drain
Axial vortex intensity significantly weaken.More rationally, air-flow enters the stream of blade for blade pressure surface, the distribution of suction surface overdraught
Dynamic resistance significantly reduces, and flow increases by 5～8%.
2. the result for comparing Fig. 3 and Fig. 5 can be seen that：The scope of the import circulation 5 of the induction of leaf top suction surface axial vortex 4
Reduce with intensity so that circular velocity declines to a great extent, the flowage friction of air inlet catchment port near wall is lost, damaged around kinetic energy
Losing reduces, and intake efficiency is improved.
3. because the present embodiment improves air-flow into the inlet air conditions of blade path, therefore leaf top barrel two can be cancelled
The anti-surge ring device of side, manufacturing cost is greatly lowered.
4. on year-on-year basis under the conditions of reversible propeller fan total pressure efficiency improve 3～5%, reached energy-saving purpose.
The present invention gives embodiment 2 to 6.The structure of the reversible Axial Fan Blades in embodiment 2 and 3 and enforcement
The structure of reversible Axial Fan Blades is identical in example 1, and concrete structure is referring to Fig. 7 and Fig. 8.The technical parameter of remaining embodiment is shown in
Table 1.
Table 1
Above content technological thought only to illustrate the invention, it is impossible to which protection scope of the present invention is limited with this, it is every to press
According to technological thought proposed by the present invention, any change done on the basis of technical scheme, claims of the present invention is each fallen within
Protection domain within.
Claims (1)
1. there are the reversible Axial Fan Blades of blowing groove, it is characterised in that：Including what is be made up of petiole (1) and blade (2)
Blade；The top of blade (2) along the circumferential direction offers 2～10 blowing grooves (3), and blowing groove (3) is some symmetrical structures
Groove, blowing groove (3) is distributed on leaf top surface, by vane tip airfoil pressure side and suction surface UNICOM；Blowing groove (3) is radially
Depth less than or equal to vortex yardstick on vane tip suction surface radius；The center line and blower fan of blowing groove (3) width
The circumferencial direction of rotation is in the same direction, and the spacing between the center line of each blowing groove width is 5～30mm, blowing groove (3)
Width is 2.5～10mm, and depth is 10～50mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510046696.6A CN104613009B (en) | 2015-01-29 | 2015-01-29 | Reversible axial flow fan blade with air blowing grooves |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510046696.6A CN104613009B (en) | 2015-01-29 | 2015-01-29 | Reversible axial flow fan blade with air blowing grooves |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104613009A CN104613009A (en) | 2015-05-13 |
| CN104613009B true CN104613009B (en) | 2017-04-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510046696.6A Active CN104613009B (en) | 2015-01-29 | 2015-01-29 | Reversible axial flow fan blade with air blowing grooves |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106704261B (en) * | 2016-12-07 | 2023-08-18 | 杭州宏德智能装备科技有限公司 | Axial flow fan ternary impeller with vein structure and non-uniform tail fin |
| US11225874B2 (en) * | 2019-12-20 | 2022-01-18 | Raytheon Technologies Corporation | Turbine engine rotor blade with castellated tip surface |
| CN111255730B (en) * | 2020-01-15 | 2021-03-16 | 武汉大学 | Flange-groove combined type blade tip gap leakage vortex cavitation suppressor |
| CN112705523B (en) * | 2021-01-22 | 2022-05-27 | 思泰基智能科技(上海)有限公司 | Keyboard cleaning device based on aerodynamics |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102536898A (en) * | 2010-12-29 | 2012-07-04 | 台达电子工业股份有限公司 | Fan and impeller thereof |
| CN103527516A (en) * | 2013-11-01 | 2014-01-22 | 赵瑞华 | Noiseless multiple-effect energy-saving axial flow fan |
| CN204458517U (en) * | 2015-01-29 | 2015-07-08 | 苏莫明 | There is the reversible Axial Fan Blades of blowing groove |
-
2015
- 2015-01-29 CN CN201510046696.6A patent/CN104613009B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102536898A (en) * | 2010-12-29 | 2012-07-04 | 台达电子工业股份有限公司 | Fan and impeller thereof |
| CN103527516A (en) * | 2013-11-01 | 2014-01-22 | 赵瑞华 | Noiseless multiple-effect energy-saving axial flow fan |
| CN204458517U (en) * | 2015-01-29 | 2015-07-08 | 苏莫明 | There is the reversible Axial Fan Blades of blowing groove |
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| Publication number | Publication date |
|---|---|
| CN104613009A (en) | 2015-05-13 |
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