CN106402025A - Noise lowering structure for axial flow fan - Google Patents
Noise lowering structure for axial flow fan Download PDFInfo
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- CN106402025A CN106402025A CN201610966342.8A CN201610966342A CN106402025A CN 106402025 A CN106402025 A CN 106402025A CN 201610966342 A CN201610966342 A CN 201610966342A CN 106402025 A CN106402025 A CN 106402025A
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- fan
- wedge
- curve
- point
- blade
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Classifications
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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
-
- 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
- F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
- F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
- F04D29/666—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps by means of rotor construction or layout, e.g. unequal distribution of blades or vanes
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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 noise lowering structure for an axial flow fan and belongs to the fluid mechanical noise lowering field. The noise lowering structure for the axial flow fan comprises a rim, fan blades, a hub and wedge-shaped structures; the rim, the fan blades, the hub and the wedge-shaped structures are integrally formed through injection molding; the fan blades start from the outer edge of the hub and sweep forwards and extend to the inner side face of the rim in the radial direction; the fan blades are distributed in the circumferential direction at equal intervals with the rotating center axis of the fan as the center; the correspondingly wedge-shaped structures are arranged on one side face of each fan blade in the radial direction; and the wedge-shaped structures comprise the two shapes of a fold line type and a curve type. According to the noise lowering structure for the axial flow fan, by means of irregular disturbance of the wedge-shaped structures on surrounding air, the pneumatic noise of the axial flow fan is lowered, and by means of the guiding effect of the wedge-shaped structures on air, the flow quantity of the axial flow fan is increased; and in addition, the noise lowering structure for the axial flow fan can meet the structural strength and fatigue life requirements of the axial flow fan in the work process and makes the overall performance of the axial flow fan improved.
Description
Technical field
The invention belongs to fluid machinery class noise reduction field, more particularly, to a kind of aerofoil fan denoising structure.
Background technology
In recent years, with the high power of electromotor, the complication of front deck parts arrangement and densification, before electromotor
The heat dispersion in cabin is put forward higher requirement.Therefore, cooling fan of engine load increases, and rotating speed increases.And with cooling
The increase of rotation speed of the fan, its noise also can significantly increase, and is one of main source of car load noise, and the ride comfort of occupant is big
Big reduction.Therefore, the collaborative lifting of cooling fan aeroperformance and noiseproof feature has become as the research of numerous companies and scholar
Object.
Have that air quantity is big due to aerofoil fan, small volume, efficiency high the features such as, be therefore used for the pressure of automobile engine
Cooling.The noise source of aerofoil fan mainly has vibration noise and aerodynamic noise two parts, through lot of experiments and emulation
Checking learns that its vibration noise accounting weight in overall noise less, can be ignored.And the aerodynamic noise of aerofoil fan can divide
For two parts：Discrete noise and broadband noise.Wherein, discrete noise is mainly due to empty around the periodic disturbance of fan blade
Gas and then cause pressure fluctuation and produce, also referred to as rotational noise；It is mutual with surrounding air that broadband noise is primarily referred to as blade
The governed turbulence noise of no specific rule of the complexity that effect produces.
The mechanism producing for aerofoil fan noise and feature, scholars propose and substantial amounts of carry out noise reduction for noise source
Method, can be largely classified into two big class：On the one hand the structural parameters of fan blade are optimized, are ensureing the pneumatic property of fan
Reduce its aerodynamic noise while energy；On the other hand, by bionic research, based on the Typical animal noiseless theory of flight,
The feather morphological characteristic reconstruct axial fan blade using for reference the animals such as owl carries out noise reduction process.
Chinese patent (CN102086887A) discloses a kind of aerofoil fan, by the end face of flabellum outer end towards axle stream
Fan direction of rotation previous flabellum projection one boss reduces fan noise, but also reduces the pneumatic property of fan to a certain extent
Energy；Chinese patent (CN102022381A) discloses a kind of axial flow bionic blade, by blade afterbody open different size,
The serrated slot of spacing reduces noise, but can produce stress concentration in sawtooth trench bottom, reduces the structural strength of fan blade, contracting
The short service life of fan.
In general, prior art has the following disadvantages：(1) it is difficult to aerofoil fan aeroperformance and noiseproof feature
Collaborative lifting；(2) zigzag axial fan blade edge, easily produces stress concentration in serrated tip, under blade construction intensity
Fall, fatigue life also can shorten.
Content of the invention
For overcoming the deficiencies in the prior art, the invention provides a kind of aerofoil fan denoising structure, it is capable of pneumatic property
Lifting can be worked in coordination with noiseproof feature, structure is simple, manufacturing process is easy, disclosure satisfy that the structural strength of blade and tired longevity simultaneously
Life requires.
The present invention is to reach the technical scheme that above-mentioned purpose adopts to be：
A kind of aerofoil fan denoising structure it is characterised in that including wheel rim, fan blade, wheel hub and some wedge structures,
Described wheel rim, fan blade, wheel hub and some wedge structures pass through injection moulding integrated molding；Described fan blade starts from outside wheel hub
Edge, and radially sweepforward extends to wheel rim medial surface；Described fan blade centered on fan center of rotation axis, in the circumferential
Equally it is distributed；Radially arranged multiple wedge structures on one side of described fan blade.
In such scheme, described wedge structure includes along its place fan blade radially-arranged rule parameter：I-th wedge
Radius at shape structure centre is ri,Wherein, rn+1For fan blade tip radius, r0For wheel hub half
Footpath；Spacing between+1 wedge structure of jth and j-th wedge structure is Δ tj=rj+1-rj, and meet ∑ Δ tj=rn+1-
r0；The width of i-th wedge structure is ti, highly be hi；Wherein, i=1,2,3 ... n；J=0,1,2 ... n.
In such scheme, described wedge structure be broken line type wedge structure ABC, A point be plane blade profile in leading edge curve with
The point of contact of blade back curve, B point be broken line type wedge structure on chord length B in fan blade0Vertical dimension farthest, C point is folding
Line style wedge structure terminal.
In such scheme, the structural parameters of described broken line type wedge structure ABC include：Straight line AB is in interior chord length B0On throwing
Shadow is apart from B1, point B is to interior chord length B0Vertical dimension H1And straight line BC and interior chord length B0Angle β, and structural parameters meet pass
It is that formula is：B1+H1cot(β)≤B0.
In such scheme, described wedge structure is shaped form wedge structure A ' B ' C ', curve A ' B ' and curve B ' C ' in point
B ' place tangent line all with interior chord length B0Parallel；The curve form of shaped form wedge structure can be according to practical situation and processing technique
Chosen, such as parabola, the combination of circular arc, cubic curve or two of which curve.
In such scheme, the structural parameters of described shaped form wedge structure A ' B ' C ' include：Curve A ' B ' is in interior chord length B0
On projector distance B2, point B ' arrive interior chord length B0Vertical dimension H2, the tangent line located in point C ' of curve B ' C ' and interior chord length B0Folder
Angle beta ', curve B ' C ' are in interior chord length B0On projector distance B3The tangent line located in point A ' with curve A ' B ' and fan blade plane leaf
The angle α ' of the tangent line in point A ' for the type leading edge curve；And the relational expression that structural parameters meet is：B2+B3≤B0.
Beneficial effects of the present invention：The present invention is radially spaced in former axial fan blade one side surface (front or the back side)
Arrange some wedge structures, aerofoil fan aerodynamic noise is reduced to the irregular disturbance of surrounding air by wedge structure, passes through
Wedge structure increases the flow of aerofoil fan to the guide effect of air；Meanwhile, the wedge structure of fan blade surface has because of it
Similar to the action effect of " fin ", aerofoil fan structural strength in the course of the work and fatigue life requirements can be met,
Aerofoil fan overall performance is lifted.
Brief description
Fig. 1 is the schematic diagram of aerofoil fan denoising structure；
Fig. 2 is the schematic diagram of broken line type wedge structure；
Fig. 3 is the schematic diagram of shaped form wedge structure；
Fig. 4 is wedge shape denoising structure in blade surface radial arrangement schematic diagram；
Fig. 5 is broken line type, the schematic diagram of parabola-circular arc build-up curve profile shaft flow fan denoising structure, and Fig. 5 (a) is folding
The schematic diagram of line style aerofoil fan denoising structure, Fig. 5 (b) is parabola-circular arc build-up curve profile shaft flow fan denoising structure
Schematic diagram.
Specific embodiment
Below in conjunction with the accompanying drawings and specific embodiment the present invention is further illustrated, but protection scope of the present invention is simultaneously
Not limited to this.
As shown in figure 1, a kind of aerofoil fan denoising structure, including wheel rim 1, fan blade 2, wheel hub 3 and some wedge shapes knot
Structure 4 (quantity of wedge structure 4, size and the regularity of distribution according to actual cooling fan air quantity and noise reduction it needs to be determined that), wheel rim
1st, fan blade 2, wheel hub 3 and some wedge structures 4 pass through injection moulding integrated molding；Fan blade 2 starts from wheel hub 3 outer rim, and
Radially sweepforward extends to wheel rim 1 medial surface；Fan blade 2, centered on fan center of rotation axis, is between grade in the circumferential
Away from distribution；Radially arranged wedge structure 4 on one side of fan blade 2.
A kind of work process of aerofoil fan denoising structure：
Aerofoil fan rotates under Motor drive effect, and the leading edge of fan blade 2 plane blade profile and trailing edge are successively to air
Acting：Air is divided into two strands of air-flows in edge, and one air-flow is along face of blade：The track a of " leading edge-blade back-trailing edge " flows through,
Another strand of air-flow is along along vacuum side of blade：The track b of " leading edge-leaf basin-trailing edge " flows through, and final two parts air converges at trailing edge
Close；Because two trajectory path length are different, and track b length is more than track a length, is therefore exerted according to the principle of continuity and uncle
Sharp principle, air-flow produces pressure differential in fan blade 2 front with the back side.Air is in the presence of this pressure differential along aerofoil fan
Axial direction flows to dirty from upstream；Air fluid at fan blade 2 near wall, under viscous force effect, is protected with blade surface
Hold equidirectional rotation, thus be subject to a radial direction, the centrifugal action that deviates from axis direction simultaneously, and this direction oriented
Movement velocity or movement tendency；The wedge structure 4 arranged on fan front or reverse side surface in the present invention, permissible
Reduce the air capacity radially deviating from axial-movement, guiding air axially movable, and then increases air quantity of fan, improves it
Aeroperformance；Two strands of air-flows converge and eventually disengage from blade at trailing edge, form vortex；Due to fan blade 2 surfactant fluid fortune
Dynamic complexity, also can form big vortex in blade surface；In the present invention on fan front or reverse side surface
Blade surface can these big vortex be cut by the wedge structure of arrangement, separate and be refined into multiple little vortex, reduces whirlpool
Intensity of flow, and the Shedding Vortex being formed at trailing edge is efficiently separated and guides, thus weakening the pressure fluctuation of blade surface,
Reduce the aerodynamic noise of aerofoil fan.
Aerofoil fan is centered on axis, radius is as ri(i=1,2 ... n, n are wedge structure 4 in single fan blade 2
Number) certain cylindrical cross-section launch, obtain the floor map of the wedge structure on some blade surface.
As shown in Fig. 2 wedge structure 4 is broken line type, it is located at as a example fan blade front by wedge structure 4,；Wherein, LE,
TE is respectively blade plane blade profile front and rear edges；O1、O2It is respectively blade plane blade profile front and rear edges center；For blade plane
Chord length in blade profile, size is equal to B0；Angle γ is tangent line at leading edge with blade back point of contact for the blade plane blade profile leading edge and interior string
Long angle；ABC is broken line type wedge structure, and wherein A point is the point of contact of leading edge curve and blade back curve in plane blade profile, B point
For on broken line type wedge structure with chord length B in fan blade 20Vertical dimension farthest, C point is broken line type wedge structure terminal；
The structural parameters of broken line type wedge structure ABC include：Straight line AB is in interior chord length B0On projector distance B1, point B is to interior chord length B0's
Vertical dimension H1, straight line BC and interior chord length B0Angle β.
In order to ensure the thickness at axial fan blade plate plane blade profile trailing edge, the structural parameters of broken line type wedge structure ABC
Following condition should be met：
B1-H1cot(β)≤B0(1)
As shown in figure 3, wedge structure 4 is shaped form, wherein, wedge structure A ' B ' C ', curve A ' B ' and curve B ' C ' exist
Point B ' place tangent line all with interior chord length B0Parallel；The curve form of shaped form wedge structure can be according to practical situation and processing work
Skill is chosen, such as parabola, the combination of circular arc, cubic curve or two of which curve；The structure ginseng of wedge structure A ' B ' C '
Number includes：Curve A ' B ' is in interior chord length B0On projector distance B2, point B ' arrive interior chord length B0Vertical dimension H2, curve B ' C ' exists
Tangent line at C ' and interior chord length B0Angle β ', curve B ' C ' in interior chord length B0On projector distance B3With curve A ' B ' in point
The tangent line at A ' place and the angle α ' of the tangent line in point A ' for the fan blade 2 plane blade profile leading edge curve.With point B ' in interior chord length B0On
Subpoint be initial point, within chord length B0For X-axis (direction is to point to trailing edge for just), within chord length B0Vertical direction is Y-axis (side
To point to fan front for just), set up local coordinate system XOY；Assume shaped form wedge structure A ' B ' C ' by two sections of curve y=
f1(x)(x∈(-B2, 0)) and y=f2(x)(x∈(0,B3)) form, two sections of curves should meet below equation：
f1(x=-B2)=0 (2)
f1' (x=-B2)=tan (α '+γ) (3)
f1(x=0)=H2(4)
f1' (x=0)=0 (5)
f2(x=0)=H2(6)
f2' (x=0)=0 (7)
f2(x=B3)=0 (8)
f2' (x=B3)=- tan β ' (9)
B2+B3≤B0(10)
With aerofoil fan rotation axiss as the longitudinal axis, radius is transverse axis, and mapping obtains wedge structure arrangement rule diametrically
Rule, as shown in Figure 4.In Fig. 4, r0For wheel hub 3 radius (i.e. fan blade 2 root radius), rn+1For fan blade 2 tip radius,
riFor the radius of i-th wedge structure 4 center,I=1,2,3 ... n, n are single fan blade 2
The number of upper wedge structure 4；Separation delta t between+1 wedge structure of jth 4 and j-th wedge structure 4j=rj+1-rj；And it is full
Sufficient ∑ Δ tj=rn+1-r0；hiAnd tiIt is respectively height and width (i=1,2,3 ... n, j=0,1,2 ... of i-th wedge structure
n).
As shown in figure 5, be respectively the number of 15 ° and 5 °, fan blade 2 with blade plane blade profile root and tip established angle
As a example the aerofoil fan being 10 ° for 6, sweepforward angle, in aerofoil fan front injection broken line type (Fig. 5 (a)) and parabola-circular arc group
Close the wedge shape denoising structure of shaped form (Fig. 5 (b)), respectively as shown in figure (a) and figure (b).Wherein, wedge shape denoising structure is radially
On the regularity of distribution meet：N=2, ti=6mm,I.e. the identical wedge structure of two rows is evenly distributed on
Each face of blade of aerofoil fan.Centered on aerofoil fan axis, radius beCylindrical cross-section
Launch, obtain blade plane blade profile and the wedge structure cross section structure of fan blade herein.Wherein, broken line type and parabola-circle
The structural parameters of the wedge structure of arc build-up curve type are：B1=B2=0.75B0, H1=H2=0.5B0, β=β '=90 °,B3=H2=0.5B0.The aeroperformance of aerofoil fan is calculated by CFD/CAA coupling process and pneumatic makes an uproar
Sound, with respect to primitive axis flow fan, the aerofoil fan air quantity with broken line type wedge structure increased 2%, and aerodynamic noise reduces
1dB；Aerofoil fan air quantity with parabola-circular arc build-up curve type wedge structure increased 4%, and aerodynamic noise reduces
1.5dB.
Only presently preferred embodiments of the present invention described above, the present invention is not limited to enumerate above-described embodiment it should say
Bright, any those of ordinary skill in the art, under the teaching of this specification, all equivalent substitutes of being made, substantially become
Shape form, all falls within the essential scope of this specification, ought to be protected by the present invention.
Claims (6)
1. a kind of aerofoil fan denoising structure is it is characterised in that include wheel rim (1), fan blade (2), wheel hub (3) and some wedges
Shape structure (4), described wheel rim (1), fan blade (2), wheel hub (3) and some wedge structures (4) pass through injection moulding integrated molding；Institute
State fan blade (2) and start from wheel hub (3) outer rim, and radially sweepforward extends to wheel rim (1) medial surface；Described fan blade
(2) centered on fan center of rotation axis, equally it is distributed in the circumferential；On one side of described fan blade (2)
Radially arranged multiple wedge structure (4).
2. a kind of aerofoil fan denoising structure according to claim 1 is it is characterised in that described wedge structure (4) is along it
The radially-arranged rule parameter of place fan blade (2) includes：The radius of i-th wedge structure (4) center is ri,Wherein, rn+1For fan blade (2) tip radius, r0For wheel hub (3) radius；+ 1 wedge shape knot of jth
Spacing between structure (4) and j-th wedge structure (4) is Δ tj=rj+1-rj, and meet ∑ Δ tj=rn+1-r0；I-th wedge shape
The width of structure (4) is ti, highly be hi；Wherein, i=1,2,3 ... n；J=0,1,2 ... n.
3. a kind of aerofoil fan denoising structure according to claim 1 is it is characterised in that described wedge structure (4) is folding
Line style wedge structure ABC, A point is the point of contact of leading edge curve and blade back curve in plane blade profile, and B point is on broken line type wedge structure
Interior chord length B with fan blade (2)0Vertical dimension farthest, C point is broken line type wedge structure terminal.
4. a kind of aerofoil fan denoising structure according to claim 3 is it is characterised in that described broken line type wedge structure
The structural parameters of ABC include：Straight line AB is in interior chord length B0On projector distance B1, point B is to interior chord length B0Vertical dimension H1And it is straight
Line BC and interior chord length B0Angle β, and structural parameters meet relational expression be：B1+H1cot(β)≤B0.
5. a kind of aerofoil fan denoising structure according to claim 1 is it is characterised in that described wedge structure (4) is song
The tangent line that line style wedge structure A ' B ' C ', curve A ' B ' and curve B ' C ' locate in point B ' all with interior chord length B0Parallel；Shaped form wedge
The curve form of shape structure can be chosen according to practical situation and processing technique, such as parabola, circular arc, cubic curve or its
In two kinds of curves combination.
6. a kind of aerofoil fan denoising structure according to claim 5 is it is characterised in that described shaped form wedge structure A '
The structural parameters of B ' C ' include：Curve A ' B ' is in interior chord length B0On projector distance B2, point B ' arrive interior chord length B0Vertical dimension
H2, the tangent line located in point C ' of curve B ' C ' and interior chord length B0Angle β ', curve B ' C ' in interior chord length B0On projector distance B3With
The angle α ' of the tangent line that curve A ' B ' locates in point A ' and the tangent line in point A ' for fan blade (2) the plane blade profile leading edge curve；And tie
Structure parameter meet relational expression be：B2+B3≤B0.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610966342.8A CN106402025A (en) | 2016-10-28 | 2016-10-28 | Noise lowering structure for axial flow fan |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610966342.8A CN106402025A (en) | 2016-10-28 | 2016-10-28 | Noise lowering structure for axial flow fan |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106402025A true CN106402025A (en) | 2017-02-15 |
Family
ID=58015429
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610966342.8A Pending CN106402025A (en) | 2016-10-28 | 2016-10-28 | Noise lowering structure for axial flow fan |
Country Status (1)
| Country | Link |
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| CN (1) | CN106402025A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109281866A (en) * | 2018-12-07 | 2019-01-29 | 泰州市罡阳喷灌机有限公司 | The bionic blade of liquid-ring type self priming pump |
| CN110005638A (en) * | 2019-04-30 | 2019-07-12 | 苏州睿昕汽车配件有限公司 | Integral type water conservancy diversion wheel hub structure fan |
| CN110510093A (en) * | 2019-09-23 | 2019-11-29 | 南昌航空大学 | Propeller and its manufacturing method with sailfish shape Yu cat owl feather feature |
| CN111523220A (en) * | 2020-04-17 | 2020-08-11 | 中国空气动力研究与发展中心高速空气动力研究所 | Fan and compressor rotating-static interference broadband noise rapid prediction method considering flow influence |
| CN111536075A (en) * | 2020-03-25 | 2020-08-14 | 浙江科贸智能机电股份有限公司 | Blade of ventilator and axial flow ventilator thereof |
| CN111677692A (en) * | 2020-05-21 | 2020-09-18 | 同济大学 | Noise reduction type axial flow fan |
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| KR20090027113A (en) * | 2007-09-11 | 2009-03-16 | 위니아만도 주식회사 | Fan and refrigerator using the same |
| CN104514757A (en) * | 2013-09-27 | 2015-04-15 | 王艺如 | Noise absorbing structure of cooling fan |
| JP2016065536A (en) * | 2014-09-18 | 2016-04-28 | 株式会社デンソー | Air blower |
| CN105736425A (en) * | 2016-04-26 | 2016-07-06 | 浙江理工大学 | Axial flow fan comprising blades with wing-type guide plates and guide blades with bionic tail edges |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| EP1316731A1 (en) * | 2001-12-03 | 2003-06-04 | Fläkt Solyvent-Ventec | Axial fan and means for reducing noise |
| KR20090027113A (en) * | 2007-09-11 | 2009-03-16 | 위니아만도 주식회사 | Fan and refrigerator using the same |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109281866A (en) * | 2018-12-07 | 2019-01-29 | 泰州市罡阳喷灌机有限公司 | The bionic blade of liquid-ring type self priming pump |
| CN109281866B (en) * | 2018-12-07 | 2023-09-15 | 泰州市罡阳喷灌机有限公司 | Bionic blade of water ring type self-priming pump |
| CN110005638A (en) * | 2019-04-30 | 2019-07-12 | 苏州睿昕汽车配件有限公司 | Integral type water conservancy diversion wheel hub structure fan |
| CN110005638B (en) * | 2019-04-30 | 2024-01-12 | 苏州睿昕汽车配件有限公司 | Integrated guide hub structure fan |
| CN110510093A (en) * | 2019-09-23 | 2019-11-29 | 南昌航空大学 | Propeller and its manufacturing method with sailfish shape Yu cat owl feather feature |
| CN111536075A (en) * | 2020-03-25 | 2020-08-14 | 浙江科贸智能机电股份有限公司 | Blade of ventilator and axial flow ventilator thereof |
| CN111536075B (en) * | 2020-03-25 | 2024-05-28 | 浙江科贸智能机电股份有限公司 | Blade of ventilator and axial flow ventilator thereof |
| CN111523220A (en) * | 2020-04-17 | 2020-08-11 | 中国空气动力研究与发展中心高速空气动力研究所 | Fan and compressor rotating-static interference broadband noise rapid prediction method considering flow influence |
| CN111677692A (en) * | 2020-05-21 | 2020-09-18 | 同济大学 | Noise reduction type axial flow fan |
| CN111677692B (en) * | 2020-05-21 | 2022-02-18 | 同济大学 | Noise reduction type axial flow fan |
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Application publication date: 20170215 |