CN107237777B - Agricultural ventilator sweep blade and design method thereof - Google Patents
Agricultural ventilator sweep blade and design method thereof Download PDFInfo
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- CN107237777B CN107237777B CN201710646512.9A CN201710646512A CN107237777B CN 107237777 B CN107237777 B CN 107237777B CN 201710646512 A CN201710646512 A CN 201710646512A CN 107237777 B CN107237777 B CN 107237777B
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- 238000000034 method Methods 0.000 title claims abstract description 28
- 230000005484 gravity Effects 0.000 claims abstract description 37
- 238000005457 optimization Methods 0.000 abstract description 9
- 238000005452 bending Methods 0.000 abstract description 3
- 238000004422 calculation algorithm Methods 0.000 abstract description 2
- 238000006073 displacement reaction Methods 0.000 description 3
- 238000009423 ventilation Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 244000144972 livestock Species 0.000 description 1
- 244000144977 poultry Species 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
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
- F04D29/384—Blades characterised by form
- F04D29/386—Skewed blades
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- General Engineering & Computer Science (AREA)
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Abstract
The invention belongs to the technical field of agricultural machinery, and relates to a curved blade of an agricultural ventilator and a design method thereof. The shape of the swept blade is controlled by a barycentric stacking line designed based on a quadratic Bezier curve. The bending design is carried out in the circumferential plane, and the design parameters are bending angle alpha and x direction control parameter k x Control parameter k in y-direction y . The glancing design is carried out in the axial plane, and the design parameters are glancing angle beta and z direction control parameter k z R direction control parameter k r . And (3) keeping the geometric parameters of each section unchanged, and determining the sweep position of each section according to the shape of the overlapped line of the gravity center by taking the gravity center of the section as a reference point. By combining the design parameters and matching with an optimization algorithm, the optimal sweep blade under the theoretical corresponding optimization target can be obtained.
Description
Technical Field
The invention belongs to the technical field of agricultural machinery, and relates to a curved blade of an agricultural ventilator and a design method thereof.
Background
Agricultural ventilators are widely used in facility agriculture, such as solar greenhouses and environmental ventilation in livestock and poultry houses. At present, most agricultural ventilators in the market are the 'DDZ' series agricultural ventilators developed in ninety years of the last century, the internal flow loss is serious, and the energy efficiency of the fans is low. Therefore, the energy efficiency ratio of the agricultural ventilator is improved, and the method has important significance for improving the agricultural ventilation efficiency, saving energy and protecting environment.
Besides torsion along the span direction, the curved blade also has inclination (bending) along the circumferential rotation direction and inclination (skimming) along the incoming flow direction between the blade top and the blade root, and is a blade with a complex three-dimensional space structure.
At present, the curved blade is widely applied to impeller machinery, and a large number of experimental researches and numerical calculations show that reasonable blade curved sweep can change radial component force of acting force of the blade and air flow, control the surface pressure gradient distribution of the blade, reduce flow loss and achieve the purpose of improving aerodynamic performance of the impeller machinery. The study of the sweep blade is mainly focused on the sweep of the blade tip and the blade root area, but the sweep study of the sweep in the whole blade height range, namely the specific shape of the barycenter stacking line, is not much discussed, and no consensus is obtained on what type of barycenter stacking line is selected and how to control the barycenter stacking line. The agricultural ventilator has smaller hub and longer blades, and the control of the sweep shape on the whole blade height is worth exploring.
Disclosure of Invention
The invention aims to provide an agricultural ventilator sweep blade with the shape of the blade controlled by a gravity center stacking line designed based on a quadratic Bezier curve.
Another object of the invention is to provide a method for designing curved and swept blades of an agricultural ventilator.
In order to achieve the above object, the present invention provides the following technical solutions:
the shape of the swept blade is controlled by the barycentric stacking line designed based on the quadratic Bezier curve. The curved blade control curve is the projection of the gravity center stacking line in the circumferential plane and is positioned in the x-y plane, and the design parameters are the curved angle alpha and the x-direction control parameter k x Control parameter k in y-direction y . The control curve of the swept blade is the rotation projection of the gravity center stacking line in the axial plane, and is positioned in the r-z plane, and the design parameters are the sweep angle beta and the z direction control parameter k z R direction control parameter k r . And (3) keeping the geometric parameters of each section unchanged, and determining the sweep position of each section according to the shape of the overlapped line of the gravity center by taking the gravity center of the section as a reference point.
A plurality of curved swept blades 1 of an agricultural ventilator impeller are uniformly and radially arranged along the circumferential direction of a hub 2 to form the impeller, the blade shape of the curved swept blades 1 is controlled by a gravity center stacking line designed based on a quadratic Bezier curve, wherein,
the projection of the gravity center stacking line in the circumferential plane is a curved blade control curve, and the curved blade control curve is positioned in an x-y plane, and the control equation is as follows:
the rotation projection of the gravity center stacking line in the axial plane is a swept blade control curve, which is positioned in the r-z plane, and the control equation is as follows:
in the method, in the process of the invention,
P x controlling the x-direction coordinate of the curve for the bent blade;
P y controlling the y-direction coordinate of the curve for the bent blade;
P z controlling the z-direction coordinate of the curve for the swept blade;
P r controlling the r direction coordinate of the curve for the swept blade;
t is Bezier function argument;
r is the radius of the impeller;
r 0 is the root radius;
alpha is a bent angle;
beta is the glancing angle;
k x the control parameter is the x-direction control parameter of the curved blade control curve;
k y the control parameter is the control parameter of the curved blade in the y direction;
k z controlling a parameter in the z direction of a curve for the swept blade;
k r the control parameter is the direction control parameter of a swept blade control curve r;
the x direction and the y direction are the x direction and the y direction after the cylindrical coordinate system is converted into the rectangular coordinate system when the gravity center bent angle of the blade root is 0 DEG;
the z direction is axial and the r direction is radial.
A design method of a curved and swept blade 1 of an agricultural ventilator uses a gravity center stacking line designed based on a quadratic Bezier curve to control the blade shape of the curved and swept blade 1;
the projection of the gravity center stacking line in the circumferential plane is a curved blade control curve and is positioned in an x-y plane; the rotation projection of the gravity center stacking line in the axial plane is a swept blade control curve, and the gravity center stacking line is positioned in the r-z plane;
the control equation of the curved blade control curve is:
the control equation of the swept blade control curve is:
in the method, in the process of the invention,
P x controlling the x-direction coordinate of the curve for the bent blade;
P y controlling the y-direction coordinate of the curve for the bent blade;
P z controlling the z-direction coordinate of the curve for the swept blade;
P r controlling the r direction coordinate of the curve for the swept blade;
t is Bezier function argument;
r is the radius of the impeller;
r 0 is the root radius;
alpha is a bent angle;
beta is the glancing angle;
k x the control parameter is the x-direction control parameter of the curved blade control curve;
k y the control parameter is the control parameter of the curved blade in the y direction;
k z controlling a parameter in the z direction of a curve for the swept blade;
k r the control parameter is the direction control parameter of a swept blade control curve r;
the x direction and the y direction are the x direction and the y direction after the cylindrical coordinate system is converted into the rectangular coordinate system when the gravity center bent angle of the blade root is 0 DEG;
the z direction is axial and the r direction is radial.
For an agricultural ventilator blade with an impeller radius of 600-700 mm,
the three design parameters of the bent blade are as follows:
the value range of alpha is 5-15 degrees;
k x the value range of (2) is 0.5-1.5;
k y the value range of (2) is 0.5-1.0;
the three design parameters of the swept blade are:
the value range of beta is 5-15 degrees;
k z the range of the value of (2) is-0.5;
k r the range of the value of (2) is 0.5-1.0.
Compared with the prior art, the invention has the beneficial effects that:
(1) The design method for designing the gravity center stacking line by adopting the secondary Bezier curve has the advantages of simple and clear design parameters and convenient control, and the obtained gravity center stacking line is flexible and can control the sweep shape of the whole upper blade.
(2) The method adopts a design method of designing the gravity center stacking line by a secondary Bezier curve, has definite design parameters and parameter ranges, and can obtain the optimal sweep blade under the theoretical corresponding optimization target by combining the design parameters and matching with an optimization algorithm.
(3) Compared with the conventional agricultural ventilator, the curved blade of the agricultural ventilator with the shape of the blade controlled by the gravity center stacking line designed based on the secondary Bezier curve has higher energy efficiency ratio, and the energy efficiency ratio is improved by more than 15%.
Drawings
FIG. 1a is a curved blade control curve design of an agricultural ventilator of the present invention;
FIG. 1b is a schematic view of a control curve for a swept blade of an agricultural ventilator according to the present invention;
FIG. 2 is a schematic view of a swept blade according to an embodiment of the invention.
Wherein the reference numerals are as follows:
1-bend sweep blade
2 wheel hub
3 section of
4-gravity center stacking line
P 0 Is the center of gravity of the blade root section
P 1 Is the center of gravity of the cross section of the blade tip
P 2 Control points for curved blade shape
P 3 Control points for swept blade shape
Alpha is the angle of bend
Beta is the glancing angle
Detailed Description
The invention is further illustrated below with reference to examples.
As shown in fig. 1a, 1b and 2, a plurality of agricultural ventilator sweep blades 1 are uniformly and radially arranged along the circumferential direction of a hub 2 to form an impeller. The blade shape of the swept blade 1 is controlled by a barycentric stacking line designed based on a quadratic Bezier curve, wherein,
the projection of the gravity center stacking line in the circumferential plane is a curved blade control curve, and the curved blade control curve is positioned in an x-y plane, and the control equation is as follows:
the rotation projection of the gravity center stacking line in the axial plane is a swept blade control curve, which is positioned in the r-z plane, and the control equation is as follows:
in the method, in the process of the invention,
P x controlling the x-direction coordinate of the curve for the bent blade;
P y controlling the y-direction coordinate of the curve for the bent blade;
P z controlling the z-direction coordinate of the curve for the swept blade;
P r controlling the r direction coordinate of the curve for the swept blade;
t is Bezier function argument;
r is the radius of the impeller;
r 0 is the root radius;
alpha is a bent angle;
beta is the glancing angle;
k x the control parameter is the x-direction control parameter of the curved blade control curve;
k y the control parameter is the control parameter of the curved blade in the y direction;
k z controlling a parameter in the z direction of a curve for the swept blade;
k r the control parameter is the direction control parameter of a swept blade control curve r;
the x direction and the y direction are the x direction and the y direction after the cylindrical coordinate system is converted into the rectangular coordinate system when the gravity center bent angle of the blade root is 0 DEG;
the z direction is axial and the r direction is radial.
A method for designing a swept blade 1 of an agricultural ventilator, comprising: the blade shape of the swept blade 1 is controlled using a barycentric stacking line designed based on a quadratic Bezier curve.
The projection of the gravity center stacking line in the circumferential plane is a curved blade control curve and is positioned in an x-y plane; the rotational projection of the barycentric stacking line in the axial plane is a swept blade control curve, which lies in the r-z plane.
First point P of quadratic Bezier curve 0 The tail point P is the center of gravity of the blade root section 1 Is the center of gravity of the cross section of the blade tip. P (P) 2 The point is a curved blade shape control point, k x Is P 2 X-direction control parameter, k, of point y Is P 2 The y-direction of the dots controls the parameters. P (P) 3 The point is the control point k of the shape of the swept blade z Is P 3 The z-direction control parameter, k, of the point r Is P 3 The r direction of the point controls the parameter. Specific parameters of the blade are introduced: impeller radius R, root radius R 0 Angle α, sweep β.
Then in rectangular coordinate system, the control point P of the bent blade 0 、P 1 、P 2 The coordinates of (c) can be written as: p (P) 0 (0，r 0 )，P 1 (Rsinα，Rcosα)，P 2 (k x Rsinα，k y Rcos alpha), swept blade control point P 0 、P 1 、P 3 The coordinates of (c) can be written as: p (P) 0 (0，r 0 )，P 1 (Rtanβ，R)，P 2 (k z Rtanβ，k r R)。
The control equation of the curved blade control curve is:
the control equation of the swept blade control curve is:
in the method, in the process of the invention,
P x controlling the x-direction coordinate of the curve for the bent blade;
P y controlling the y-direction coordinate of the curve for the bent blade;
P z controlling the z-direction coordinate of the curve for the swept blade;
P r controlling the r direction coordinate of the curve for the swept blade;
t is Bezier function argument;
r is the radius of the impeller;
r 0 is the root radius;
alpha is a bent angle;
beta is the glancing angle;
k x the control parameter is the x-direction control parameter of the curved blade control curve;
k y the control parameter is the control parameter of the curved blade in the y direction;
k z controlling a parameter in the z direction of a curve for the swept blade;
k r the parameters are controlled for the direction of the swept blade control curve r.
For an agricultural ventilator blade with an impeller radius of 600-700 mm,
preferably, three design parameters of the bent blade:
the value range of alpha is 5-15 degrees;
k x the value range of (2) is 0.5-1.5;
k y the value range of (2) is 0.5-1.0;
preferably, the three design parameters of the swept blade:
the value range of beta is 5-15 degrees;
k z the range of the value of (2) is-0.5;
k r the range of the value of (2) is 0.5-1.0.
By combining the optimization method, the optimal curved blade and optimal swept blade parameter combination under the theoretical corresponding optimization target can be obtained. The optimization range of design parameters can be properly adjusted for impellers of different sizes.
Examples
The curved swept blade design method of the present invention is applied to a conventional agricultural ventilator wheel, as shown in fig. 2, which includes a hub 2 and curved swept blades 1, six curved swept blades 1 being uniformly disposed around the hub 2. Impeller radius r=634 mm, root radius R 0 =114 mm. According to the curved blade control curve expression provided by the invention, the control equation of the specific curved blade control curve is as follows:
the control equation of the specific swept blade control curve is:
and uniformly selecting a plurality of sections 3 along the height of the blade to be used as the modeling section of the sweep blade. The shape control point determines the shape of the barycentric stacking line, which determines the displacement of the cross section.
For the curved blade, the geometric parameters of the section are kept unchanged, the r and z direction coordinates are kept unchanged, and the displacement of each section in the x and y directions is determined according to a curved blade control curve.
For the swept blade, the geometric parameters of the section are kept unchanged, the coordinates of the x direction, the y direction and the r direction are kept unchanged, and the displacement of each section in the z direction is determined according to a control curve of the swept blade.
The optimization method adopts an orthogonal test method, takes the energy efficiency ratio as an optimization target, and adopts a numerical simulation method to calculate the performance of each curved blade and each swept blade fan so as to obtain the energy efficiency ratio. Tables 1 and 2 show the results of orthogonal tests for the curved blade and the swept blade, respectively.
Comparative example conventional agricultural ventilator blade α=10°, k x ＝1.2，k y =0.7; energy efficiency ratio 24.68m 3 /(h·W)。β＝5°，k z ＝0，k r =0.8, energy efficiency ratio 24.68m 3 /(h·W)。
By analysis of the results of the orthogonal test, the optimal combination of curved blades is determined to be α=15°, k x ＝1.5，k y =0.5, and the curved blade fan under the optimal combination is taken for accounting to obtain the energy efficiency ratio of 29.74m 3 And (h.W), which is improved by 20.5 percent compared with the conventional agricultural ventilator. The optimal combination of swept blades is β=10°, k z ＝-0.5，k r =0.6, and the energy efficiency ratio of 28.49m is obtained by accounting the swept blade fans under the optimal combination 3 And (h.W), which is improved by 15.4 percent compared with the conventional agricultural ventilator.
TABLE 1 results of orthogonal test of bent blades
Wherein, K1, K2 and K3 respectively refer to the average value of each factor under the same level, for example, K1 of alpha is the average value of air quantity under the condition of alpha=5 DEG, and K x K1 of (2) is K x Energy efficiency ratio average under the condition of=0.5.
TABLE 2 results of quadrature test of swept blades
Claims (2)
1. The utility model provides a curved sweep blade (1) of agricultural ventilator impeller, a plurality of curved sweep blades (1) set up radially along the circumference of wheel hub (2) evenly and constitute impeller, its characterized in that: the blade shape of the swept blade (1) is controlled by a gravity center stacking line designed based on a quadratic Bezier curve, wherein,
the projection of the gravity center stacking line in the circumferential plane is a curved blade control curve, and the curved blade control curve is positioned in an x-y plane, and the control equation is as follows:
the rotation projection of the gravity center stacking line in the axial plane is a swept blade control curve, which is positioned in the r-z plane, and the control equation is as follows:
in the method, in the process of the invention,
P x controlling the x-direction coordinate of the curve for the bent blade;
P y controlling the y-direction coordinate of the curve for the bent blade;
P z controlling the z-direction coordinate of the curve for the swept blade;
P r controlling the r direction coordinate of the curve for the swept blade;
t is Bezier function argument;
r is the radius of the impeller;
r 0 is the root radius;
alpha is a bent angle;
beta is the glancing angle;
k x the control parameter is the x-direction control parameter of the curved blade control curve;
k y the control parameter is the control parameter of the curved blade in the y direction;
k z controlling a parameter in the z direction of a curve for the swept blade;
k r the control parameter is the direction control parameter of a swept blade control curve r;
the x direction and the y direction are the x direction and the y direction after the cylindrical coordinate system is converted into the rectangular coordinate system when the gravity center bent angle of the blade root is 0 DEG;
the z direction is axial, and the r direction is radial;
for an agricultural ventilator blade with an impeller radius of 600-700 mm,
the three design parameters of the bent blade are as follows:
the value range of alpha is 5-15 degrees;
k x the value range of (2) is 0.5-1.5;
k y the value range of (2) is 0.5-1.0;
the three design parameters of the swept blade are:
the value range of beta is 5-15 degrees;
k z the range of the value of (2) is-0.5;
k r the range of the value of (2) is 0.5-1.0.
2. The design method of the curved blade (1) of the agricultural ventilator is characterized in that:
controlling the blade shape of the swept blade (1) by using a gravity center stacking line designed based on a quadratic Bezier curve;
the projection of the gravity center stacking line in the circumferential plane is a curved blade control curve and is positioned in an x-y plane; the rotation projection of the gravity center stacking line in the axial plane is a swept blade control curve, and the gravity center stacking line is positioned in the r-z plane;
the control equation of the curved blade control curve is:
the control equation of the swept blade control curve is:
in the method, in the process of the invention,
P x controlling the x-direction of the curve for a curved bladeCoordinates;
P y controlling the y-direction coordinate of the curve for the bent blade;
P z controlling the z-direction coordinate of the curve for the swept blade;
P r controlling the r direction coordinate of the curve for the swept blade;
t is Bezier function argument;
r is the radius of the impeller;
r 0 is the root radius;
alpha is a bent angle;
beta is the glancing angle;
k x the control parameter is the x-direction control parameter of the curved blade control curve;
k y the control parameter is the control parameter of the curved blade in the y direction;
k z controlling a parameter in the z direction of a curve for the swept blade;
k r the control parameter is the direction control parameter of a swept blade control curve r;
the x direction and the y direction are the x direction and the y direction after the cylindrical coordinate system is converted into the rectangular coordinate system when the gravity center bent angle of the blade root is 0 DEG;
the z direction is axial, and the r direction is radial;
for an agricultural ventilator blade with an impeller radius of 600-700 mm,
the three design parameters of the bent blade are as follows:
the value range of alpha is 5-15 degrees;
k x the value range of (2) is 0.5-1.5;
k y the value range of (2) is 0.5-1.0;
the three design parameters of the swept blade are:
the value range of beta is 5-15 degrees;
k z the range of the value of (2) is-0.5;
k r the range of the value of (2) is 0.5-1.0.
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| CN108757568B (en) * | 2018-05-29 | 2020-10-23 | 青岛科技大学 | Axial flow fan blade |
| CN108825553A (en) * | 2018-07-18 | 2018-11-16 | 成都华川电装有限责任公司 | The blade structure of aerofoil fan |
| CN112814943A (en) * | 2021-02-03 | 2021-05-18 | 西安重装韩城煤矿机械有限公司 | Integrally formed curved and swept combined blade, impeller and axial flow fan |
| CN112974734B (en) * | 2021-02-03 | 2023-03-10 | 西安科技大学 | Manufacturing method of integrally formed swept combined blade |
| CN115479042B (en) * | 2022-10-17 | 2024-06-25 | 清华大学 | Vane design method based on gravity center stacking line control and vane pump designed by same |
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