CN115342068B - Method for improving performance of agricultural ventilator - Google Patents
Method for improving performance of agricultural ventilator Download PDFInfo
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- CN115342068B CN115342068B CN202210930567.3A CN202210930567A CN115342068B CN 115342068 B CN115342068 B CN 115342068B CN 202210930567 A CN202210930567 A CN 202210930567A CN 115342068 B CN115342068 B CN 115342068B
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- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000009434 installation Methods 0.000 claims abstract description 34
- 238000009423 ventilation Methods 0.000 claims abstract description 32
- 230000003068 static effect Effects 0.000 claims abstract description 23
- 238000004519 manufacturing process Methods 0.000 claims abstract description 7
- 238000011056 performance test Methods 0.000 claims abstract description 6
- 238000005457 optimization Methods 0.000 claims abstract description 5
- 230000002708 enhancing effect Effects 0.000 claims 2
- 238000010586 diagram Methods 0.000 description 6
- 238000011161 development Methods 0.000 description 5
- 238000005265 energy consumption Methods 0.000 description 4
- 230000006872 improvement Effects 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 238000010146 3D printing Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000004134 energy conservation Methods 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 239000003292 glue Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- UJCHIZDEQZMODR-BYPYZUCNSA-N (2r)-2-acetamido-3-sulfanylpropanamide Chemical compound CC(=O)N[C@@H](CS)C(N)=O UJCHIZDEQZMODR-BYPYZUCNSA-N 0.000 description 1
- 241001669680 Dormitator maculatus Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009395 breeding Methods 0.000 description 1
- 230000001488 breeding effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000000556 factor analysis Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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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
- F04D19/00—Axial-flow pumps
- F04D19/002—Axial flow fans
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01B—SOIL WORKING IN AGRICULTURE OR FORESTRY; PARTS, DETAILS, OR ACCESSORIES OF AGRICULTURAL MACHINES OR IMPLEMENTS, IN GENERAL
- A01B76/00—Parts, details or accessories of agricultural machines or implements, not provided for in groups A01B51/00 - A01B75/00
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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
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/001—Testing thereof; Determination or simulation of flow characteristics; Stall or surge detection, e.g. condition monitoring
-
- 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
- F04D29/384—Blades characterised by form
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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
- F04D29/544—Blade shapes
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Soil Sciences (AREA)
- Environmental Sciences (AREA)
- Physics & Mathematics (AREA)
- Geometry (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention belongs to the field of mechanical application equipment, and particularly relates to a method for improving the performance of an agricultural ventilator. The method comprises the following steps: s1, performing performance test on a prototype agricultural ventilator to obtain ventilation quantity, inlet static pressure and power parameters of the prototype agricultural ventilator; s2, reversely modeling the blades 4 of the prototype agricultural ventilator to obtain the radial position, chord length and air inlet geometric angle corresponding to the relative blade height of the blades 4 of the prototype agricultural ventilator; s3, selecting an airfoil matched with the blade 4 of the prototype agricultural ventilator as an airfoil of the front guide vane 6; s4, taking the ventilation quantity as an optimization target, and solving a function model of the front guide vane installation combination; s5, manufacturing the front guide vane 6 according to the wing profile of the front guide vane 6 obtained in the step S3; and then installing the front guide vane 6 on the prototype agricultural ventilator according to the function model of the front guide vane installation combination obtained in the step S4.
Description
Technical Field
The invention belongs to the field of mechanical application equipment, and particularly relates to a method for improving the performance of an agricultural ventilator.
Background
With the development of economy and society, china has changed from a fast development stage of pursuing economy to a high-quality development stage, and the social and economic transformation has put new requirements on production scale and production quality of various industries and higher requirements on the supply of fluid machinery. As a typical fluid machine, the wide application of the axial flow fan also correspondingly puts higher demands on the axial flow fan, wherein the problems of high energy consumption and low utilization rate of the axial flow fan are most urgent to solve. Therefore, improving the efficiency of the axial flow fan and reducing the energy consumption of the axial flow fan become bottlenecks for limiting the rapid development of the axial flow fan industry.
Along with the high-quality development of modern breeding industry in China, higher requirements are put forward on low energy consumption and large ventilation of an agricultural axial flow fan. The agricultural axial flow fan for performance detection in the performance detection laboratory of ventilation equipment of China university has ventilation energy efficiency distributed in the range of 20% -40%, and compared with the efficient fan in the world, the agricultural axial flow fan has generally lower efficiency and higher electricity consumption, so that the improvement of the energy conversion efficiency of the agricultural axial flow fan is a key point for energy conservation and emission reduction. The front guide vane is additionally arranged to change the air inlet angle of the air flow so as to optimize the agricultural axial flow fan, thereby being feasible for improving the ventilation quantity and reducing the energy consumption and having great significance for energy conservation and environmental protection. At present, the front guide vane is not applied to the field of agricultural axial flow fans, no ready results are available for the person skilled in the art, and the invention is based on the background.
Disclosure of Invention
Aiming at the technical problems, the invention aims to provide a method for improving the performance of an agricultural ventilator, which selects an airfoil matched with a blade of a prototype agricultural ventilator as an airfoil of a front guide vane, and obtains the installation angle alpha of the front guide vane through a ventilation quantity, the installation structure parameters and a function model of the front guide vane of the ventilator 1 The optimal values of the dynamic and static installation distance L of the guide vanes and the number n of the guide vanes are adopted, so that the ventilation quantity and the ventilation energy efficiency ratio of the agricultural ventilator are obviously improved, the internal flow state of the agricultural ventilator is improved, and the acting capacity of the agricultural ventilator is improved.
In order to achieve the above object, the present invention provides the following technical solutions:
a method for improving the performance of an agricultural ventilator, the agricultural ventilator comprises a motor 1, a rotating shaft 2, a hub 3, blades 4 and a current collector 5; wherein, the inlet and the outlet of the current collector 5 are circular rings with equal diameters, and the motor 1 is fixed on the wall surface of the current collector 5 through a motor bracket; the rotating shaft 2 of the motor 1 extends to the front end of the hub 3; the root of the blade 4 is placed in a groove reserved in the hub 3 and fixed on the hub 3;
wherein the method comprises the following steps:
s1, performing performance test on a prototype agricultural ventilator to obtain ventilation quantity, inlet static pressure and power parameters of the prototype agricultural ventilator;
s2, reversely modeling the blades 4 of the prototype agricultural ventilator to obtain the radial position, chord length and air inlet geometric angle corresponding to the relative blade height of the blades 4 of the prototype agricultural ventilator;
s3, selecting an airfoil matched with the blade 4 of the prototype agricultural ventilator as an airfoil of the front guide vane 6; wherein,,
the corresponding chord length of the blade 4 at the position of 0.5 relative to the blade height is selected as the chord length of the front guide vane 6, and the lift coefficient is selected to be 0.9-1.1, and the wing section relative thickness is selected
An airfoil of 0.05 to 0.1 is used as an airfoil of the front guide vane 6;
s4, taking the ventilation quantity as an optimization target, and solving a function model of the front guide vane installation combination:
ventilation quantity and guide vane installation angle alpha 1 The function models of the dynamic and static installation distance L of the guide vanes and the number n of the guide vanes, namely the function model of the front guide vane installation combination is as follows:
wherein x is 1 Mounting angle alpha for front guide vane 1 The unit is DEG; x is x 2 The dynamic and static installation distance L of the guide vane is in mm; x is x 3 The number of the guide vanes is n;
s5, manufacturing the front guide vane 6 according to the wing profile of the front guide vane 6 obtained in the step S3; and then installing the front guide vane 6 on the prototype agricultural ventilator according to the function model of the front guide vane installation combination obtained in the step S4.
In step S3, the chord length of the front guide vane 6 is 103mm, the lift coefficient of the airfoil of the front guide vane 6 is 0.96, and the relative thickness of the airfoil of the front guide vane 6
0.09.
The hub 3 is divided into a front part and a rear part, and is buckled on the rotating shaft 2 through a nut ring.
Compared with the prior art, the invention has the beneficial effects that:
1) According to the method for improving the performance of the agricultural ventilator, the wing profile matched with the blades of the original agricultural ventilator is selected as the wing profile of the front guide vane, and the ventilation quantity and the energy efficiency ratio of the ventilator are obviously improved through a function model of the ventilation quantity and the installation structural parameters of the front guide vane.
2) The method for improving the performance of the agricultural ventilator can improve the ventilation energy efficiency ratio of the agricultural ventilator by 5.7-10.39%, and improve the ventilation rate by 6.62-10.89%.
3) The method for improving the performance of the agricultural ventilator can effectively enhance the working capacity of the fan blades.
Drawings
FIG. 1a is a left side view block diagram of an agricultural ventilator;
FIG. 1b is a front view block diagram of an agricultural ventilator;
FIG. 1c is a rear view block diagram of an agricultural ventilator;
FIG. 2a is a first schematic view of a leading vane airfoil selected from leading vanes of the present invention;
FIG. 2b is a second schematic view of a leading vane airfoil selected for leading vanes of the present invention;
FIG. 3a is an isometric view of a front vane mounting embodiment of an agricultural ventilator of the present invention;
FIG. 3b is a rear view block diagram of a front vane mounting embodiment of the agricultural ventilator of the present invention;
FIG. 4a is a view of the mounting angle α of the front guide vane of the present invention 1 A first schematic diagram of a dynamic and static installation distance L parameter of the guide vane;
fig. 4b is a second schematic diagram of parameters of the static and dynamic installation distance L of the front guide vane of the present invention, wherein the parameters are the installation angle α1 of the front guide vane;
FIG. 5a is a graph comparing the ventilation of the present invention with a prototype agricultural ventilator;
FIG. 5b is a graph comparing the energy efficiency ratio of the present invention to a prototype agricultural ventilator;
fig. 6a is a pressure line graph at span=0.15 (low span);
fig. 6b is a pressure line graph at span=0.50 (midspan);
fig. 6c is a pressure line graph at span=0.85 (high span).
Wherein the reference numerals are as follows:
1 motor 2 shaft
3 hub 4 blade
5 wind collector 6 front guide vane
7-rotating-shaft 8-guide-vane trailing edge
9 hub front edge
α 1 Guide vane mounting angle L guide vane dynamic and static mounting distance
Detailed Description
In order to make the technical features of the present invention more clear, the present invention will be further described with reference to the accompanying drawings and examples.
As shown in fig. 1a, 1b and 1c, an agricultural ventilator comprises a motor 1, a rotating shaft 2, a hub 3, blades 4 and a collector 5. Wherein,,
the inlet and the outlet of the current collector 5 are circular rings with equal diameters, and the motor 1 is fixed on the wall surface of the current collector 5 through a motor bracket. The rotating shaft 2 of the motor 1 extends forward to the front end of the hub 3. The hub 3 is divided into a front part and a rear part, and is buckled on the rotating shaft 2 through a nut ring. The root of the blade 4 is placed in a groove reserved in the hub 3 and fixed on the hub 3.
A method of improving the performance of an agricultural ventilator comprising the steps of:
s1, performing performance test on a prototype agricultural ventilator to obtain performance parameters;
and performing performance test on the prototype agricultural ventilator to obtain the ventilation quantity, the inlet static pressure and the power parameters of the prototype agricultural ventilator.
S2, reversely modeling the blades 4 of the prototype agricultural ventilator to obtain the radial position, chord length and air inlet geometric angle corresponding to the relative blade height of the blades 4 of the prototype agricultural ventilator;
and reversely modeling the blades 4 of the prototype agricultural ventilator in 3D modeling software to obtain the radial position, chord length and air inlet geometric angle corresponding to the relative blade height of the blades 4 of the prototype agricultural ventilator.
S3, selecting an airfoil matched with the blade 4 of the prototype agricultural ventilator as an airfoil of the front guide vane 6;
optimum lift coefficient Cyopt, lift-drag ratio 1/μ (1/μ=Cy/Cx), airfoil relative thickness for different airfoils
Stall performance, airfoil shape, etc. are somewhat different. The lift coefficient is selected to be 0.9-1.1, and the wing section relative thickness is +.>
An airfoil of 0.05 to 0.1 is used as the airfoil of the front guide vane 6.
S4, taking the ventilation quantity as an optimization target, and solving a function model of the front guide vane installation combination:
because the function model belongs to a curved surface equation, design-Expert software is adopted for assisting in solving.
Mounting angle alpha to guide vane 1 And respectively carrying out single factor analysis on the dynamic and static installation distance L of the guide vanes and the number n of the guide vanes, wherein the external characteristic takes the ventilation quantity and the energy efficiency ratio of the fan as evaluation indexes, and the internal characteristic takes the internal flow field characteristic of the fan as an evaluation index, so as to obtain a better value interval of each factor.
Wherein the guide vane mounting angle alpha 1 The fan performance is better in the range of the air inlet geometric angle corresponding to the blade height of 0.3 to 0.7 times; the fan performance with the same number of guide vanes and blades is better; the static and dynamic installation distance L of the guide vane is 0.85b h ～1.2b h (b h Is the chord length of the root of the blade) has better fan performance.
According to the Box-Behnken test combination design principle, the guide vane installation angle alpha is used 1 The dynamic and static installation distance L of the guide vanes and the number n of the guide vanes are taken as test factors, and the ventilation quantity is taken as a response value to carry out response surface simulation test research so as to obtain the ventilation quantity and the guide vane installation angle alpha 1 Functional models of dynamic and static installation distance L of guide vanes and number n of guide vanes, namely prepositioningThe function model of the guide vane installation combination is as follows:
wherein x is 1 Mounting angle alpha for front guide vane 1 The unit is DEG; x is x 2 The dynamic and static installation distance L of the guide vane is in mm; x is x 3 The number of the guide vanes is n.
S5, manufacturing the front guide vane 6 according to the wing profile of the front guide vane 6 obtained in the step S3; and then installing the front guide vane 6 on the prototype agricultural ventilator according to the function model of the front guide vane installation combination obtained in the step S4.
According to the wing profile of the front guide vane 6 obtained in the step S3, the front guide vane 6 is manufactured through 3D printing, and according to the guide vane mounting angle alpha obtained in the step S4 1 The front guide vanes 6 are arranged at the corresponding positions of the motor 1 of the original agricultural ventilator, the grooves are in one-to-one correspondence, and the front guide vanes are fixed by liquid glue. Wherein, leading guide vane installation angle alpha 1 An included angle between the root chord line of the guide vane and the direction of the rotating shaft; the dynamic and static installation distance L of the guide vane is the distance between the tail part of the guide vane and the front edge of the hub.
Examples
S1, performing performance test on a prototype agricultural ventilator to obtain performance parameters
A 550 agricultural ventilator (hereinafter referred to as a prototype agricultural ventilator) is structured as shown in fig. 1a, 1b, and 1 c. The rotation speed of the agricultural ventilator is 1440r/min, the diameters of an inlet and an outlet of the ventilator are 550mm, the radial length of a blade is 221mm, the diameter of a hub of the ventilator is 98mm, the diameter of a motor is 125mm, the length of the motor is 148mm, and the axial distance between an inlet and an outlet is 380mm.
Under the working condition (49.02 Pa), the air quantity of the prototype agricultural ventilator is 6343m3/h, and the energy efficiency ratio is 14.2m 3 /(h·W)。
S2, reversely modeling the prototype agricultural ventilator blade, and further analyzing to obtain relevant parameters of the blade
Reversely modeling the prototype agricultural ventilator blade in 3D modeling software, and further analyzing to obtain the radial position, chord length and air inlet geometric angle corresponding to the relative blade height of the blade:
s3, selecting the wing profile as the wing profile of the front guide vane
According to the characteristics of the prototype agricultural ventilator blade, NACA 0015 is selected as the wing profile of the front guide vane 6, the chord length of the front guide vane 6 is 103mm, the lift coefficient of the wing profile of the front guide vane 6 is 0.96, and the relative thickness of the wing profile of the front guide vane 6
0.09. As shown in fig. 2a and 2 b.
S4, taking the ventilation quantity as an optimization target, and solving a function model of the front guide vane installation combination
Wherein x is 1 Mounting angle alpha for front guide vane 1 The unit is DEG; x is x 2 The dynamic and static installation distance L of the guide vane is in mm; x is x 3 The number of the guide vanes is n.
As shown in fig. 3a, 3b, 4a and 4b, the parameters of the front guide vane of the agricultural ventilator of this embodiment are set to the front guide vane mounting angle a 1 =21°, vane dynamic and static mounting distance l=57 mm, vane number n=4.
S5, manufacturing the front guide vane 6 according to the wing profile of the front guide vane 6 obtained in the step S3; and (3) installing the front guide vane 6 on the prototype agricultural ventilator according to the function model of the front guide vane installation combination obtained in the step S4.
According to the wing profile of the front guide vane 6 obtained in the step S3, the front guide vane 6 is manufactured through 3D printing, and according to the guide vane mounting angle alpha obtained in the step S4 1 The front guide vane 6 is mounted on the frame with the guide vane dynamic and static mounting distance L=57 mm and the guide vane number n=4 of the guide vane of 21 DEGThe grooves are in one-to-one correspondence with the corresponding positions of the motor 1 of the prototype agricultural ventilator and are fixed by liquid glue.
The method for improving the performance of the agricultural ventilator can improve the ventilation quantity and the ventilation energy efficiency ratio of the agricultural ventilator. Compared with a prototype agricultural ventilator, the ventilation rate is 6772m under the working condition (49.02 Pa) 3 And/h, 6.76% improvement; the energy efficiency ratio is 15.3m 3 /(h.W), 7.75% improvement.
In order to explain the performance of the invention under all working conditions in detail, the ventilation quantity, the energy efficiency ratio and the blade surface pressure line are taken as examples for analysis.
Fig. 5a is a graph comparing the ventilation of the present invention with that of a prototype agricultural ventilator, and it can be seen that the ventilation gradually decreases with the increase of the inlet static pressure, and the present invention is superior to the prototype agricultural ventilator under all working conditions.
Fig. 5b is a graph comparing the energy efficiency ratio of the present invention with that of a prototype agricultural ventilator, and it can be seen that the energy efficiency ratio gradually decreases with the increase of the inlet static pressure, and the present invention is superior to the prototype agricultural ventilator under all working conditions.
Fig. 6a is a pressure line graph at span=0.15 (low span), from which it can be seen that the maximum differential pressure of the surface of the prototype agricultural ventilator blade is about 300Pa; it can be obviously seen that the fan pressure line treated by the method wraps the pressure line of the prototype agricultural fan, the pressure difference of the blades is obviously increased, and the functional capacity of the blades is enhanced.
Fig. 6b is a graph of span=0.50 (midspan) pressure, with the surface pressure differential of the prototype farm ventilator blade increasing, with a maximum pressure differential of about 520Pa; the difference in fan pressure lines after treatment according to the invention is further increased.
Fig. 6c is a graph of span=0.85 (high span) pressure, with the surface pressure differential of the prototype farm ventilator blade continuing to increase, with a maximum of about 600Pa; the difference in fan pressure lines after treatment according to the invention is further increased.
It can be seen intuitively in connection with fig. 6a, 6b and 6c that at low spans, the leading edge of the blade is subject to a negative pressure gradient, since the inlet angle of the blade is negative, the incoming flow first contacts the suction side of the blade, and the pressure of the suction side at the leading edge of the blade is significantly higher than the pressure side, resulting in a large loss at the root of the blade. The pressure difference between the suction surfaces of the middle pressure surface and the upper pressure surface of the blade is larger, and the blade is a main working area of the blade.
Claims (3)
1. A method of improving the performance of an agricultural ventilator comprising a motor (1), a shaft (2), a hub (3), blades (4) and a current collector (5); wherein, the inlet and the outlet of the current collector (5) are circular rings with equal diameters, and the motor (1) is fixed on the wall surface of the current collector (5) through a motor bracket; the rotating shaft (2) of the motor (1) extends to the front end of the hub (3) towards the front end; the root of the blade (4) is placed in a groove reserved in the hub (3) and fixed on the hub (3);
the method is characterized in that: the method comprises the following steps:
s1, performing performance test on a prototype agricultural ventilator to obtain ventilation quantity, inlet static pressure and power parameters of the prototype agricultural ventilator;
s2, reversely modeling the blades (4) of the prototype agricultural ventilator to obtain the radial position, chord length and air inlet geometric angle corresponding to the relative blade height of the blades (4) of the prototype agricultural ventilator;
s3, selecting an airfoil matched with a blade (4) of the prototype agricultural ventilator as an airfoil of the front guide vane (6); wherein,,
the chord length corresponding to the position of the blade (4) with 0.5 relative to the blade height is selected as the chord length of the front guide vane (6), and the lift coefficient is selected to be 0.9-1.1 and the wing section relative thickness is selected
An airfoil with the diameter of 0.05-0.1 is used as an airfoil of the front guide vane (6);
s4, taking the ventilation quantity as an optimization target, and solving a function model of the front guide vane installation combination:
ventilation quantity and guide vane installation angle alpha 1 The function models of the dynamic and static mounting distance L of the guide vanes and the number n of the guide vanes, namely the function model of the front guide vane mounting combination is as follows:
wherein x is 1 Mounting angle alpha for front guide vane 1 The unit is DEG; x is x 2 The distance L for the dynamic and static installation of the guide vane is in mm; x is x 3 The number of the guide vanes is n;
s5, manufacturing the front guide vane (6) according to the wing profile of the front guide vane (6) obtained in the step S3; and then installing the front guide vane (6) on the prototype agricultural ventilator according to the function model of the front guide vane installation combination obtained in the step S4.
2. A method of enhancing the performance of an agricultural ventilator as claimed in claim 1, wherein: in step S3, the chord length of the front guide vane (6) is 103mm, the lift coefficient of the airfoil of the front guide vane (6) is 0.96, and the relative thickness of the airfoil of the front guide vane (6) is equal to
0.09.
3. A method of enhancing the performance of an agricultural ventilator as claimed in claim 1, wherein: the hub (3) is divided into a front part and a rear part, and is buckled on the rotating shaft (2) through a nut ring.
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| CN202210930567.3A CN115342068B (en) | 2022-08-04 | 2022-08-04 | Method for improving performance of agricultural ventilator |
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Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2338517Y (en) * | 1998-06-30 | 1999-09-15 | 华耀南 | Explosion-proof axial-flow electric fan for local ventilation |
| US20080219836A1 (en) * | 2007-03-05 | 2008-09-11 | Xcelaero Corporation | Fan with heat dissipating outlet guide vanes |
| CN205639016U (en) * | 2016-05-25 | 2016-10-12 | 株洲联诚集团有限责任公司 | High and cold anti -wind sand transformer fan for EMUs |
| CN107131153B (en) * | 2017-07-12 | 2023-11-07 | 成都华川电装有限责任公司 | Axial flow fan |
| CN110159564B (en) * | 2019-04-23 | 2020-06-19 | 贵州永红航空机械有限责任公司 | Axial flow fan with low specific speed |
| CN110805568B (en) * | 2019-10-18 | 2020-09-18 | 华中科技大学 | Plate-shaped rear guide vane of diagonal flow fan and design method thereof |
| CN112528397A (en) * | 2020-11-23 | 2021-03-19 | 江苏大学 | Optimized design method for rear fluid director of jet fan |
| CN114607641B (en) * | 2022-03-23 | 2023-05-05 | 珠海格力电器股份有限公司 | Guide vane structure of axial flow fan and axial flow fan |
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