CN111156201A - Axial flow fan and guide vane thereof - Google Patents

Axial flow fan and guide vane thereof Download PDF

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Publication number
CN111156201A
CN111156201A CN201911395812.XA CN201911395812A CN111156201A CN 111156201 A CN111156201 A CN 111156201A CN 201911395812 A CN201911395812 A CN 201911395812A CN 111156201 A CN111156201 A CN 111156201A
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CN
China
Prior art keywords
guide vane
blade
wing
axial flow
flow fan
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201911395812.XA
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Chinese (zh)
Inventor
卞涛
冯隽
王兵
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Jianghan University
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Jianghan University
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Publication date
Application filed by Jianghan University filed Critical Jianghan University
Priority to CN201911395812.XA priority Critical patent/CN111156201A/en
Publication of CN111156201A publication Critical patent/CN111156201A/en
Pending legal-status Critical Current

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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
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/52—Casings; Connections of working fluid for axial pumps
    • F04D29/54—Fluid-guiding means, e.g. diffusers
    • F04D29/541—Specially adapted for elastic fluid pumps
    • F04D29/542—Bladed diffusers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D19/00—Axial-flow pumps
    • F04D19/002—Axial flow fans
    • 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
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/52—Casings; Connections of working fluid for axial pumps
    • F04D29/54—Fluid-guiding means, e.g. diffusers
    • F04D29/541—Specially adapted for elastic fluid pumps
    • F04D29/542—Bladed diffusers
    • F04D29/544—Blade shapes
    • 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
    • F04D29/667—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps by influencing the flow pattern, e.g. suppression of turbulence

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Geometry (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

The invention discloses an axial flow fan and a guide vane thereof, wherein the guide vane comprises a guide vane main body and a wing knife, the wing knife is an arc-shaped vane with equal thickness, the front edge and the rear edge of the vane of the wing knife are both rectangular, the wing knife is positioned at the vane root of the guide vane main body and is connected with an impeller hub of the axial flow fan, the wing knife is parallel to the guide vane main body, the chord length of the wing knife is 50-60% of the guide vane main body, and the vane height of the wing knife is not more than 5% of the height of the guide vane main body. In addition, when the airflow generated by the rotation of the impeller passes through a channel between the wing knives and the guide vanes, the airflow gathered in the included angle area between the root of the guide vanes and the end wall surface can be blown away, and the gathering of the airflow in the included angle area between the root of the guide vanes and the end wall surface is reduced.

Description

Axial flow fan and guide vane thereof
Technical Field
The invention relates to the technical field of mechanical structures, in particular to an axial flow fan and a guide vane thereof.
Background
Axial fans generally consist of a casing, a motor, an impeller and guide vanes. The guide vanes are typically located at the rear of the impeller, radially distributed along the circumference of the impeller hub. In the use process of the axial flow fan, the guide vane has the function of rotating the deflection airflow generated by the rotation of the impeller back to the axial direction so as to achieve the purpose of improving the working efficiency of the axial flow fan.
The traditional axial flow fan guide vane is a single vane. As shown in fig. 1 and 2, which are conventional guide vanes, an air flow generated by rotation of an impeller is deflected when passing through the guide vanes, thereby generating a secondary flow. The formation of the secondary flow generates secondary flow loss on one hand; on the other hand, the airflow is collected in an included angle area between the root of the guide vane and the end wall surface under the action of the secondary flow, and the accumulation of the airflow also generates total pressure loss. The loss of secondary flow and the loss caused by the accumulation of air flow both reduce the working efficiency of the axial flow fan.
Thus, the prior art has yet to be improved and enhanced.
Disclosure of Invention
In view of the defects of the prior art, the invention aims to provide an axial flow fan and a guide vane thereof, which can effectively reduce the generation of secondary flow, reduce the total pressure loss and improve the working efficiency of the axial flow fan.
In order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides an axial fan's guide vane, includes guide vane main part and wing sword, the wing sword is the convex blade of uniform thickness, the blade leading edge and the blade trailing edge of wing sword are the rectangle, the wing sword is located the blade root department of guide vane main part and is connected with axial fan's impeller hub, the wing sword is on a parallel with the guide vane main part, the chord length of wing sword does 50% to 60% of guide vane main part, the blade height of wing sword is not more than 5% of the height of guide vane main part.
Preferably, in the guide vane of the axial flow fan, the vane bend angle of the vane is 40 °.
Preferably, in the guide vane of the axial flow fan, the thickness of the vane is 1 mm.
Preferably, in the guide vane of the axial flow fan, the chord length of the guide vane main body is 100mm, and the vane height of the guide vane main body is 200 mm.
Preferably, in the guide vane of the axial flow fan, the chord length of the vane knife is 50mm, and the vane height of the vane knife is 2.5 mm.
Preferably, in the guide vane of the axial flow fan, the chord length of the vane knife is 60mm, and the vane height of the vane knife is 2.5 mm.
Preferably, in the guide vane of the axial flow fan, the distance between the airfoil knife and the guide vane main body is 30 mm.
An axial fan comprises a plurality of guide vanes of the axial fan.
Preferably, in the axial flow fan, the grid pitch between two adjacent guide vane main bodies is 100 mm.
Preferably, in the axial flow fan, an installation angle of the guide vane main body is 20 degrees, and an installation angle of the air knife is 28 degrees to 30 degrees.
Compared with the prior art, in the axial flow fan and the guide vane thereof provided by the invention, the guide vane comprises a guide vane main body and the wing knife, the wing knife is an arc-shaped blade with equal thickness, the front edge and the rear edge of the blade of the wing knife are both rectangular, the wing knife is positioned at the blade root of the guide vane main body and is connected with the impeller hub of the axial flow fan, the wing knife is parallel to the guide vane main body, the chord length of the wing knife is 50-60% of the guide vane main body, and the blade height of the wing knife is not more than 5% of the height of the guide vane main body. According to the invention, the winged knife is arranged between the circumferential distances of the guide vane main body, so that the formation of secondary flow can be effectively blocked, and the loss of the secondary flow is reduced. In addition, when the air flow generated by the rotation of the impeller passes through the channel between the wing cutter and the guide vane, the air flow gathered in the included angle area between the root part of the guide vane and the end wall surface can be blown away, and the gathering of the air flow in the included angle area between the root part of the guide vane and the end wall surface is reduced.
Drawings
FIG. 1 is a schematic cross-sectional view of a guide vane of an axial flow fan according to the prior art;
FIG. 2 is a schematic view of a prior art guide vane of an axial flow fan;
FIG. 3 is a schematic cross-sectional view of a preferred embodiment of a vane in a guide vane of an axial flow fan according to the present invention;
FIG. 4 is a schematic cross-sectional view of a first embodiment of a guide vane of an axial flow fan provided in accordance with the present invention;
FIG. 5 is a schematic view of a first embodiment of a guide vane of an axial flow fan according to the present invention;
FIG. 6 is a schematic cross-sectional view of a second embodiment of a guide vane of an axial flow fan provided in accordance with the present invention;
FIG. 7 is a schematic view of a second embodiment of a guide vane of an axial flow fan according to the present invention;
fig. 8 is a comparison between the total pressure loss coefficients of a conventional guide vane and a guide vane with a vane.
Detailed Description
The invention provides an axial flow fan and a guide vane thereof, and in order to make the purpose, technical scheme and effect of the invention clearer and clearer, the invention is further described in detail below by referring to the attached drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
It will be understood that when an element is referred to as being "on," "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or intervening elements may also be present.
It should be noted that the terms of orientation such as left, right, up and down in the embodiments of the present invention are only relative to each other or are referred to the normal use state of the product, and should not be considered as limiting.
Referring to fig. 3 to 7, the guide vane of the axial flow fan provided by the present invention includes a guide vane main body 1 and a wing knife 2, the wing knife 2 is an arc-shaped blade with equal thickness, both a blade front edge and a blade rear edge of the wing knife 2 are rectangular, the wing knife 2 is located at a blade root of the guide vane main body 1 and connected to an impeller hub (not shown in the figure) of the axial flow fan, the wing knife 2 is parallel to the guide vane main body 1, a chord length of the wing knife 2 is 50% to 60% of the guide vane main body 1, and a blade height of the wing knife 2 is not greater than 5% of the height of the guide vane main body 1.
Specifically, the invention is provided with the wing knife 2 parallel to the guide vane main body 1 in the circumferential direction of the guide vane, the wing knife 2 can effectively block the formation of secondary flow, and when the airflow generated by the rotation of the impeller passes through a channel between the wing knife 2 and the guide vane main body 1, the airflow gathered in the included angle area of the root of the guide vane main body 1 and the end wall surface of the hub can be blown away, the gathering of the airflow in the included angle area of the root of the guide vane main body 1 and the end wall surface of the hub is reduced, and further the total pressure loss of the guide vane is reduced. In addition, the invention can reduce the profile loss of the whole guide vane and further reduce the energy loss by arranging the wing blade 2 as an equal-thickness circular arc-shaped blade, preferably, the blade bending angle of the wing blade 2 is 40 degrees, and the thickness d of the wing blade 2 is 1 mm.
Further, the simulation is performed according to a large number of simulation values, and it is obtained that when the chord length of the airfoil knife 2 is set to be 50% to 60% of the guide vane main body 1, and the blade height of the airfoil knife 2 is set to be not more than 5% of the height of the guide vane main body 1, the total pressure loss of the guide vane is minimum, so that the optimal position and the optimal size of the airfoil knife 2 are determined.
Compared with the traditional guide vane, the guide vane has the advantages that the air knives 2 are arranged between the circumferential distances of the guide vane main body 1, so that the formation of secondary flow can be effectively blocked, and the loss of the secondary flow is reduced.
In a preferred embodiment, the winged knife 2 and the guide vane main body 1 are both metal structural members, which can effectively improve the strength of the guide vane main body 1 and the winged knife 2, prolong the service life of the whole guide vane, and have good stability, so that the maintenance and repair period of the guide vane can be further prolonged, and resources are saved.
Referring to fig. 4 and 5, in a first embodiment of the guide vane of the axial flow fan provided by the present invention, the guide vane body 1 is an NACA65 airfoil vane, a chord length L of the guide vane body 1 is 100mm, a vane blade 2 parallel to the guide vane body 1 is disposed between axial distances of the guide vane body 1, a chord length L1 of the vane blade 2 is 50mm, a distance h between the vane blade 2 and the guide vane body 1 is 30mm, a vane height b of the guide vane body 1 is 200mm, and a vane height b1 of the vane blade 2 is 2.5 mm. In the simulation, as shown in fig. 8, which is a numerical simulation result performed under the conditions of the reynolds number of 200000 and the incident angle of 26 to 41 degrees, the horizontal axis in the figure is the incident angle of the airflow in degrees, and the vertical axis is the total pressure loss coefficient of the blade, the result shows that the total pressure loss coefficient (shown as 2Y in fig. 8) of the guide blade of the axial flow fan provided in the present embodiment is much lower than that of the conventional guide blade (shown as 1Y in fig. 8), so the present invention can effectively block the formation of the secondary flow, and reduce the secondary flow loss.
Referring to fig. 6 and 7, in a second embodiment of the guide vane of the axial flow fan provided by the present invention, the guide vane body 1 is an NACA65 airfoil vane, a chord length L of the guide vane body 1 is 100mm, a vane 2 parallel to the guide vane body 1 is disposed between axial distances of the guide vane body 1, a chord length L2 of the vane 2 is 50mm, a distance h between the vane 2 and the guide vane body 1 is 30mm, a vane height b of the guide vane body 1 is 20mm, a vane height b2 of the vane 2 is 2.5mm, when performing simulation, as shown in fig. 8, the figure is a result of performing numerical simulation under conditions that a reynolds number is 0 and an incident angle is 26 degrees to 41 degrees, and shows that a total pressure loss coefficient of the guide vane of the axial flow fan provided by the present embodiment (shown in fig. 3Y in fig. 8) is much lower than a total pressure loss coefficient of a conventional guide vane (shown in fig. 8, 1Y), therefore, the invention can effectively block the formation of secondary flow and reduce the loss of the secondary flow.
Based on the guide vane of the axial flow fan, the invention further provides an axial flow fan correspondingly, which includes a plurality of guide vanes of the axial flow fan according to the above embodiments, preferably, the number of the guide vanes is 5 to 9, the grid pitch between two adjacent guide vane bodies 1 is 100mm, the installation angle of the guide vane body 1 is 20 °, in the first embodiment, the installation angle of the vane blade 2 is 28.5 °, in the second embodiment, the installation angle of the vane blade 2 is 28 °, and as can be seen from fig. 8, the invention can effectively block the formation of secondary flow, and reduce the loss of the secondary flow.
In summary, in the axial flow fan and the guide vane thereof provided by the present invention, the guide vane includes a guide vane main body and a wing knife, the wing knife is an arc-shaped blade with equal thickness, both a blade front edge and a blade rear edge of the wing knife are rectangular, the wing knife is located at a blade root of the guide vane main body and connected to an impeller hub of the axial flow fan, the wing knife is parallel to the guide vane main body, a chord length of the wing knife is 50% to 60% of the guide vane main body, and a blade height of the wing knife is not greater than 5% of the guide vane main body. According to the invention, the winged knife is arranged between the circumferential distances of the guide vane main body, so that the formation of secondary flow can be effectively blocked, and the loss of the secondary flow is reduced. In addition, when the air flow generated by the rotation of the impeller passes through the channel between the wing cutter and the guide vane, the air flow gathered in the included angle area between the root part of the guide vane and the end wall surface can be blown away, and the gathering of the air flow in the included angle area between the root part of the guide vane and the end wall surface is reduced.
It should be understood that equivalents and modifications of the technical solution and inventive concept thereof may occur to those skilled in the art, and all such modifications and alterations should fall within the scope of the appended claims.

Claims (10)

1. The utility model provides a guide vane of axial fan, its characterized in that includes guide vane main part and wing sword, the wing sword is the convex blade of uniform thickness, the blade leading edge and the blade trailing edge of wing sword are the rectangle, the wing sword is located the blade root department of guide vane main part and is connected with axial fan's impeller hub, the wing sword is on a parallel with the guide vane main part, the chord length of wing sword is 50% to 60% of guide vane main part, the blade height of wing sword is not more than 5% of the height of guide vane main part.
2. The guide vane of an axial flow fan as claimed in claim 1, wherein the blade bend angle of the wing blade is 40 °.
3. The guide vane of an axial flow fan as claimed in claim 1, wherein the thickness of the wing blade is 1 mm.
4. The guide vane of an axial flow fan according to claim 1, wherein the guide vane body has a chord length of 100mm, and a vane height of 200 mm.
5. The guide vane of an axial flow fan according to claim 4, wherein the chord length of the cutting blade is 50mm, and the blade height of the cutting blade is 2.5 mm.
6. The guide vane of an axial flow fan according to claim 4, wherein the chord length of the cutting blade is 60mm, and the blade height of the cutting blade is 2.5 mm.
7. The guide vane of an axial flow fan as claimed in claim 1, wherein the distance between the fence and the guide vane body is 30 mm.
8. An axial fan comprising a plurality of guide vanes of the axial fan according to any one of claims 1 to 7.
9. The axial flow fan according to claim 8, wherein a pitch between adjacent two of the guide vane bodies is 100 mm.
10. The axial flow fan according to claim 8, wherein the installation angle of the guide vane body is 20 °, and the installation angle of the air foil is 28 ° to 30 °.
CN201911395812.XA 2019-12-30 2019-12-30 Axial flow fan and guide vane thereof Pending CN111156201A (en)

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Application Number Priority Date Filing Date Title
CN201911395812.XA CN111156201A (en) 2019-12-30 2019-12-30 Axial flow fan and guide vane thereof

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Application Number Priority Date Filing Date Title
CN201911395812.XA CN111156201A (en) 2019-12-30 2019-12-30 Axial flow fan and guide vane thereof

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CN111156201A true CN111156201A (en) 2020-05-15

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101173672A (en) * 2007-11-29 2008-05-07 北京航空航天大学 Big and small impeller vane impeller with non-full height small blade and compressor machine
EP1927723B1 (en) * 2006-11-28 2009-10-28 Deutsches Zentrum für Luft- und Raumfahrt e.V. Stator stage of an axial compressor in a flow engine with transverse fins to increase the action
FR2938871B1 (en) * 2008-11-25 2014-11-14 Snecma TURBOMACHINE BLADE GRID WITH FLOW GUIDES
CN105736426A (en) * 2016-04-26 2016-07-06 浙江理工大学 Axial flow fan comprising blade pressure surfaces with winglets and blade tops with blowing structures
CN105864105A (en) * 2016-04-25 2016-08-17 西北工业大学 Axial flow compressor stator with in-vitro small blades in hub corner area
CN108953232A (en) * 2018-07-20 2018-12-07 大连海事大学 A kind of non-axisymmetric distribution stator blade axial-flow compressor
BE1026276B1 (en) * 2018-05-14 2019-12-17 Safran Aero Boosters Sa INTER-BLADES OF AXIAL TURBOMACHINE COMPRESSOR

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1927723B1 (en) * 2006-11-28 2009-10-28 Deutsches Zentrum für Luft- und Raumfahrt e.V. Stator stage of an axial compressor in a flow engine with transverse fins to increase the action
CN101173672A (en) * 2007-11-29 2008-05-07 北京航空航天大学 Big and small impeller vane impeller with non-full height small blade and compressor machine
FR2938871B1 (en) * 2008-11-25 2014-11-14 Snecma TURBOMACHINE BLADE GRID WITH FLOW GUIDES
CN105864105A (en) * 2016-04-25 2016-08-17 西北工业大学 Axial flow compressor stator with in-vitro small blades in hub corner area
CN105736426A (en) * 2016-04-26 2016-07-06 浙江理工大学 Axial flow fan comprising blade pressure surfaces with winglets and blade tops with blowing structures
BE1026276B1 (en) * 2018-05-14 2019-12-17 Safran Aero Boosters Sa INTER-BLADES OF AXIAL TURBOMACHINE COMPRESSOR
CN108953232A (en) * 2018-07-20 2018-12-07 大连海事大学 A kind of non-axisymmetric distribution stator blade axial-flow compressor

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Application publication date: 20200515

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