CN110714875A - Efficient wind collecting cover of horizontal axis wind turbine and design method thereof - Google Patents

Efficient wind collecting cover of horizontal axis wind turbine and design method thereof Download PDF

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CN110714875A
CN110714875A CN201910823568.6A CN201910823568A CN110714875A CN 110714875 A CN110714875 A CN 110714875A CN 201910823568 A CN201910823568 A CN 201910823568A CN 110714875 A CN110714875 A CN 110714875A
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China
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wind
collecting cover
section
diameter
length
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董应民
沈光
汪旭
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Wuxi Jinscorpio Industry Co Ltd
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Wuxi Jinscorpio Industry Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03D—WIND MOTORS
    • F03D1/00—Wind motors with rotation axis substantially parallel to the air flow entering the rotor 
    • F03D1/04—Wind motors with rotation axis substantially parallel to the air flow entering the rotor  having stationary wind-guiding means, e.g. with shrouds or channels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03D—WIND MOTORS
    • F03D80/00—Details, components or accessories not provided for in groups F03D1/00 - F03D17/00
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/70—Wind energy
    • Y02E10/72—Wind turbines with rotation axis in wind direction

Abstract

The invention discloses a high-efficiency wind collecting cover of a horizontal shaft wind turbine and a design method thereof, wherein the high-efficiency wind collecting cover comprises an air inlet and an air outlet, the air inlet and the air outlet are formed by rotating a single-side molded line for 360 degrees by taking an axis as a center, the single-side molded line comprises a circular arc and a section of edge straight line, and the edge straight line is arranged at the air outlet.

Description

Efficient wind collecting cover of horizontal axis wind turbine and design method thereof
Technical Field
The invention belongs to the technical field of wind power generation, and particularly relates to a high-efficiency wind collecting cover of a horizontal axis wind turbine and a design method thereof.
Background
With the development of urbanization and industrialization, the demand for energy is increasing day by day, safer, guaranteed, economic and environment-friendly energy is urgently needed in all parts of the world, and the active development and utilization of new energy can help to reduce the carbon emission in the world. Wind energy is a renewable clean energy source, and the main utilization form of the wind energy is to convert the wind energy into electric energy through a wind turbine. At present, the single-machine power generation power of a large-scale wind turbine power generation field is gradually increased at first, however, the size of the wind turbine blade is also sharply increased along with the increase of the single-machine power generation power, and higher requirements on the aspects of the structural strength, the production process and the like of the blade are provided.
The wind collecting cover is a cover body which is contracted and then expanded along the incoming flow direction, so that the incoming flow can be accelerated through the contraction section, and the wind collecting cover also has a certain inhibiting effect on the blade tip loss of the wind turbine blade. Compared with an isolated wind turbine, the wind collecting cover surrounds the wind turbine to obviously improve the power generation power of the wind turbine, and the pneumatic overall dimension of the wind turbine with the wind collecting cover is obviously smaller than that of the isolated wind turbine if the same power is realized.
Disclosure of Invention
The invention provides a high-efficiency wind collecting cover suitable for a horizontal axis wind turbine aiming at the large aerodynamic profile size of a large blade caused by large single-machine generating power of a large wind turbine.
According to one aspect of the invention, the high-efficiency wind collecting cover of the horizontal axis wind turbine comprises an air inlet and an air outlet, wherein the air inlet and the air outlet are formed by rotating a single-side molded line by 360 degrees around an axis, the single-side molded line comprises a circular arc and a section of edge straight line, and the edge straight line is arranged at the air outlet.
According to one aspect of the invention, the design method of the high-efficiency wind collecting cover of the horizontal axis wind turbine comprises the following design steps:
the method comprises the following steps: according to the design power, the design wind speed and the predicted wind energy utilization coefficient of 0.7, the P-1/2 rho V is brought in3πR2And Cp formula, and further determining the rotating diameter D of the wind turbine impeller.
Step two: considering the structural deformation of the wind-collecting cover, increasing by 200mm on the basis of the rotating diameter D of the impeller of the wind turbine to obtain the minimum section diameter D0 of the wind-collecting cover;
determining the length L of the wind-collecting cover according to the ratio of the minimum section diameter D0 of the wind-collecting cover to the length L of the wind-collecting cover of 0.2-0.25;
determining the diameter D1 of the inlet section of the wind-collecting cover according to the ratio of the diameter D1 of the inlet section of the wind-collecting cover to the minimum diameter D0 of the wind-collecting cover being 1.2-1.3;
determining the diameter D2 of the section of the outlet of the wind collecting cover according to the ratio of the diameter D2 of the section of the outlet of the wind collecting cover to the diameter D0 of the minimum section of the wind collecting cover being 1.3-1.35;
and determining the edge straight line length L0 according to the ratio of the edge straight line length L0 to the minimum section diameter D0 of the wind-collecting cover of 0.05-0.1.
Step three: the molded line of the wind collecting cover is established in a diameter coordinate system, the central axis of the wind collecting cover is taken as an X axis, any radial direction is taken as a Y axis, the X coordinate of the minimum section of the wind collecting cover is 0, the distance from the inlet section of the wind collecting cover to the axis of the minimum section of the wind collecting cover is 9/19 of the length L of the wind collecting cover, and the distance from the outlet section of the wind collecting cover to the axis of the minimum section of the wind collecting cover is 10/19 of the length L of the wind collecting cover.
Three coordinate points A (-9L/19, D1/2), B (0, D0/2) and C (10L/19, D2/2) of the wind-collecting cover profile are determined according to the diameters and the axial lengths of the inlet section, the minimum section and the outlet section of the wind-collecting cover, the edge straight line of the wind-collecting cover is coplanar with the outlet section of the wind-collecting cover, and the two-point coordinates of the edge straight line of the wind-collecting cover are respectively C (10L/19, D2/2) and D (10L/19, D2/2+ L0).
Drawing an arc through three points A, B, C, connecting the points C and D to obtain a molded line of the wind-collecting cover, and rotating the molded line for 360 degrees along the X axis to obtain the three-dimensional aerodynamic shape of the wind-collecting cover.
In some embodiments, the wind scoop minimum cross-sectional diameter D0The ratio of the length of the wind-collecting cover to the length L of the wind-collecting cover is 0.22.
In some embodiments, the cowl inlet cross-sectional diameter D1And the minimum section diameter D of the wind-collecting cover0The ratio of (a) to (b) is 1.25.
In some embodiments, the ratio of the cowl outlet cross-sectional diameter D2 to the cowl minimum cross-sectional diameter D0 is 1.32.
In some embodiments, the ratio of the edge straight length L0 to the cowl minimum cross-sectional diameter D0 is 0.075.
The method can be used for rapidly determining the aerodynamic shape of the wind-collecting cover under the given design wind speed, the designed wind-collecting cover has a high wind-collecting coefficient, and the wind-collecting cover also has a good inhibiting effect on the blade tip loss of the wind turbine blade.
Drawings
FIG. 1 is a schematic view of the aerodynamic shape of a high-efficiency wind collecting cover of a horizontal axis wind turbine according to the present invention;
FIG. 2 is a schematic view of a molded line of a high-efficiency wind collecting cover of a horizontal axis wind turbine.
Detailed Description
The present invention will be further described with reference to the following embodiments.
As shown in fig. 1, the high-efficiency wind collecting cover of the horizontal axis wind turbine of the invention comprises an air inlet 3 and an air outlet 4, wherein the air inlet 3 and the air outlet 4 are formed by rotating a single-side molded line 5 by 360 degrees around an axis, the single-side molded line 5 comprises an arc 2 and a section of edge straight line 1, and the edge straight line 1 is arranged at the air outlet 4.
As shown in fig. 2, the axial one-side molded line 5 of the wind-collecting cover is formed by combining an arc 2 and a section of edge straight line 1, and the molded line is rotated around the axis for one circle to obtain the aerodynamic shape of the wind-collecting cover.
A design method of a high-efficiency wind collecting cover suitable for a horizontal shaft wind turbine comprises the following design steps:
the method comprises the following steps: according to the design power, the design wind speed and the predicted wind energy utilization coefficient of 0.7, the P-1/2 rho V is brought in3πR2And Cp formula, and further determining the rotating diameter D of the wind turbine impeller.
Step two: considering the structural deformation of the wind-collecting cover, increasing by 200mm on the basis of the rotating diameter D of the impeller of the wind turbine to obtain the minimum section diameter D0 of the wind-collecting cover;
determining the length L of the wind-collecting cover according to the ratio of the minimum section diameter D0 of the wind-collecting cover to the length L of the wind-collecting cover of 0.2-0.25;
determining the diameter D1 of the inlet section of the wind-collecting cover according to the ratio of the diameter D1 of the inlet section of the wind-collecting cover to the minimum diameter D0 of the wind-collecting cover being 1.2-1.3;
determining the diameter D2 of the section of the outlet of the wind collecting cover according to the ratio of the diameter D2 of the section of the outlet of the wind collecting cover to the diameter D0 of the minimum section of the wind collecting cover being 1.3-1.35;
and determining the length L0 of the edge straight line 1 according to the ratio of the length L0 of the edge straight line 1 to the minimum section diameter D0 of the wind-collecting cover of 0.05-0.1.
Step three: the molded line of the wind collecting cover is established in a diameter coordinate system, the central axis of the wind collecting cover is taken as an X axis, any radial direction is taken as a Y axis, the X coordinate of the minimum section of the wind collecting cover is 0, the distance from the inlet section of the wind collecting cover to the axis of the minimum section of the wind collecting cover is 9/19 of the length L of the wind collecting cover, and the distance from the outlet section of the wind collecting cover to the axis of the minimum section of the wind collecting cover is 10/19 of the length L of the wind collecting cover.
Three coordinate points A (-9L/19, D1/2), B (0, D0/2) and C (10L/19, D2/2) of the wind-collecting cover profile are determined according to the diameters and the axial lengths of the inlet section, the minimum section and the outlet section of the wind-collecting cover, an edge straight line 1 of the wind-collecting cover is coplanar with the outlet section of the wind-collecting cover, and two coordinates of the edge straight line 1 of the wind-collecting cover are respectively C (10L/19, D2/2) and D (10L/19, D2/2+ L0).
Drawing an arc 2 through A, B, C, connecting C and D to obtain a molded line of the wind-collecting cover, and rotating the molded line for 360 degrees along the X axis to obtain the three-dimensional aerodynamic shape of the wind-collecting cover.
Minimum section diameter D of wind-collecting cover0The ratio of the length of the wind-collecting cover to the length L of the wind-collecting cover is 0.22.
Diameter D of inlet section of wind collecting cover1And the minimum section diameter D of the wind-collecting cover0The ratio of (a) to (b) is 1.25.
The ratio of the sectional diameter D2 of the outlet of the wind-collecting cover to the minimum sectional diameter D0 of the wind-collecting cover is 1.32.
The ratio of the length L0 of the edge straight line 1 to the minimum section diameter D0 of the wind-collecting cover is 0.075.
The first embodiment is as follows:
designing a high-efficiency wind collecting cover of a 300Kw horizontal axis wind turbine, and bringing P to 1/2 rho V according to design power 300Kw, design wind speed 9.5m/s and expected wind energy utilization coefficient 0.73πR2And Cp, determining the rotating diameter D of the wind turbine impeller to be 32.4 m.
Step two: considering the structural deformation of the wind collecting cover, on the basis of the rotating diameter D of the impeller of the wind turbineThe minimum section diameter D of the wind collecting cover is obtained by increasing the diameter by 200mm0＝32.6m；
According to the minimum section diameter D of the wind-collecting cover0The ratio of the length L of the wind collecting cover to the length L of the wind collecting cover is 0.22, and the length L of the wind collecting cover is determined to be 7.17 m;
according to the diameter D of the inlet section of the wind-collecting cover1And the minimum section diameter D of the wind-collecting cover0The ratio of (1.25) to determine the diameter D of the inlet section of the wind-collecting cover1＝36.5m；
According to the diameter D of the outlet section of the wind collecting cover2And the minimum section diameter D of the wind-collecting cover0The ratio of (1.32) to determine the diameter D of the section of the outlet of the wind-collecting cover2＝37.5m；
According to the length L of the edge segment0And the minimum section diameter D of the wind-collecting cover0Is 0.075, the edge section length L is determined0＝2.45m。
Step three: the molded line of the wind-collecting cover is established in a diameter coordinate system, the central axis of the wind-collecting cover is taken as an X axis, any radial direction is taken as a Y axis, the X coordinate of the minimum section of the wind-collecting cover is 0, the distance from the inlet section of the wind-collecting cover to the axis of the minimum section of the wind-collecting cover is 3.4m, and the distance from the outlet section of the wind-collecting cover to the axis of the minimum section of the wind-collecting cover is 3.77 m.
Three coordinate points A (-3.4,18.25), B (0,16.3) and C (3.77,18.75) of the molded line of the wind-collecting cover are determined according to the diameters and the axial lengths of the inlet section, the minimum section and the outlet section of the wind-collecting cover, the edge section of the wind-collecting cover is coplanar with the outlet section of the wind-collecting cover, and the coordinates of two points of the edge section of the wind-collecting cover are respectively C (3.77,18.75) and D (3.77, 21.2).
And (3) making an arc 2 through three points A, B, C, connecting the points C and D to obtain a molded line of the air collecting cover, and rotating the molded line for 360 degrees along the X axis to obtain the three-dimensional aerodynamic shape of the air collecting cover.
Example two:
designing a high-efficiency wind collecting cover of a 400Kw horizontal-axis wind turbine, and bringing P to 1/2 rho V according to the design power of 400Kw, the design wind speed of 9.5m/s and the predicted wind energy utilization coefficient of 0.73πR2And Cp, determining the rotating diameter D of the wind turbine impeller to be 37.4 m.
Step two: taking account of wind-collecting hoodsThe structure is deformed, and the minimum section diameter D of the wind collecting cover is obtained by increasing 200mm on the basis of the rotating diameter D of the impeller of the wind turbine0＝37.6m；
According to the minimum section diameter D of the wind-collecting cover0The ratio of the length L of the wind collecting cover to the length L of the wind collecting cover is 0.22, and the length L of the wind collecting cover is determined to be 8.27 m;
according to the diameter D of the inlet section of the wind-collecting cover1And the minimum section diameter D of the wind-collecting cover0The ratio of (1.25) to determine the diameter D of the inlet section of the wind-collecting cover1＝42m；
According to the diameter D of the outlet section of the wind collecting cover2And the minimum section diameter D of the wind-collecting cover0The ratio of (1.32) to determine the diameter D of the section of the outlet of the wind-collecting cover2＝43m；
According to the length L of the edge segment0And the minimum section diameter D of the wind-collecting cover0Is 0.075, the edge section length L is determined0＝2.82m。
Step three: the molded line of the wind-collecting cover is established in a diameter coordinate system, the central axis of the wind-collecting cover is taken as an X axis, any radial direction is taken as a Y axis, the X coordinate of the minimum section of the wind-collecting cover is 0, the distance from the inlet section of the wind-collecting cover to the axis of the minimum section of the wind-collecting cover is 3.92m, and the distance from the outlet section of the wind-collecting cover to the axis of the minimum section of the wind-collecting cover is 4.35 m.
Three coordinate points A (-3.92,21), B (0,18.8) and C (4.35,21.5) of the molded line of the wind-collecting cover are determined according to the diameters and the axial lengths of the inlet section, the minimum section and the outlet section of the wind-collecting cover, the edge section of the wind-collecting cover is coplanar with the outlet section of the wind-collecting cover, and the coordinates of two points of the edge section of the wind-collecting cover are respectively C (4.35,21.5) and D (4.35, 24.32).
And (3) making an arc 2 through three points A, B, C, connecting the points C and D to obtain a molded line of the air collecting cover, and rotating the molded line for 360 degrees along the X axis to obtain the three-dimensional aerodynamic shape of the air collecting cover.
Example three:
designing a high-efficiency wind collecting cover of a 500Kw horizontal axis wind turbine, and bringing P to 1/2 rho V according to design power 500Kw, design wind speed 9.5m/s and predicted wind energy utilization coefficient 0.73πR2And Cp, determining the rotating diameter D of the wind turbine impeller to be 40.8 m.
Step two: considering the structural deformation of the wind collecting cover, the minimum section diameter D of the wind collecting cover is obtained by increasing 200mm on the basis of the rotating diameter D of the impeller of the wind turbine0＝41m；
According to the minimum section diameter D of the wind-collecting cover0The ratio of the length L of the wind collecting cover to the length L of the wind collecting cover is 0.22, and the length L of the wind collecting cover is determined to be 9 m;
according to the diameter D of the inlet section of the wind-collecting cover1And the minimum section diameter D of the wind-collecting cover0The ratio of (1.25) to determine the diameter D of the inlet section of the wind-collecting cover1＝46m；
According to the diameter D of the outlet section of the wind collecting cover2And the minimum section diameter D of the wind-collecting cover0The ratio of (1.32) to determine the diameter D of the section of the outlet of the wind-collecting cover2＝47.1m；
According to the length L of the edge segment0And the minimum section diameter D of the wind-collecting cover0Is 0.075, the edge section length L is determined0＝3.07m。
Step three: the molded line of the wind-collecting cover is established in a diameter coordinate system, the central axis of the wind-collecting cover is taken as an X axis, any radial direction is taken as a Y axis, the X coordinate of the minimum section of the wind-collecting cover is 0, the distance from the inlet section of the wind-collecting cover to the axis of the minimum section of the wind-collecting cover is 4.26m, and the distance from the outlet section of the wind-collecting cover to the axis of the minimum section of the wind-collecting cover is 4.74 m.
Three coordinate points A (-4.26,23), B (0,20.5) and C (4.74,23.55) of the molded line of the wind-collecting cover are determined according to the diameters and the axial lengths of the inlet section, the minimum section and the outlet section of the wind-collecting cover, the edge section of the wind-collecting cover is coplanar with the outlet section of the wind-collecting cover, and the two-point coordinates of the edge section of the wind-collecting cover are respectively C (4.74,23.55) and D (4.74, 26.62).
And (3) making an arc 2 through three points A, B, C, connecting the points C and D to obtain a molded line of the air collecting cover, and rotating the molded line for 360 degrees along the X axis to obtain the three-dimensional aerodynamic shape of the air collecting cover.
The foregoing describes only some embodiments of the present invention and modifications and variations thereof will be apparent to those skilled in the art without departing from the spirit and scope of the invention.

Claims (6)

1. The efficient air collecting cover of the horizontal-axis wind turbine is characterized by comprising an air inlet and an air outlet, wherein the air inlet and the air outlet are formed by rotating a single-side molded line for 360 degrees by taking an axis as a center, the single-side molded line comprises a circular arc and a section of edge straight line, and the edge straight line is arranged at the air outlet.
2. The design method of the high-efficiency wind collecting cover of the horizontal axis wind turbine is characterized by comprising the following design steps of:
the method comprises the following steps: according to the design power, the design wind speed and the predicted wind energy utilization coefficient of 0.7, the P-1/2 rho V is brought in3πR2And Cp formula, and further determining the rotating diameter D of the wind turbine impeller.
Step two: considering the structural deformation of the wind collecting cover, the minimum section diameter D of the wind collecting cover is obtained by increasing 200mm on the basis of the rotating diameter D of the impeller of the wind turbine0；
According to the minimum section diameter D of the wind-collecting cover0The ratio of the length L of the air collecting cover to the length L of the air collecting cover is 0.2-0.25, and the length L of the air collecting cover is determined;
according to the diameter D of the inlet section of the wind-collecting cover1And the minimum section diameter D of the wind-collecting cover0The ratio of (1.2) to (1.3) and determining the diameter D of the inlet section of the wind-collecting cover1；
According to the diameter D of the outlet section of the wind collecting cover2And the minimum section diameter D of the wind-collecting cover0The ratio of (1.3) to (1.35) and determining the diameter D of the section of the outlet of the wind collecting cover2；
According to the length L of the edge straight line0And the minimum section diameter D of the wind-collecting cover0The ratio of (1) to (2) is 0.05-0.1, and the length L of the edge straight line is determined0。
Step three: the molded line of the wind collecting cover is established in a diameter coordinate system, the central axis of the wind collecting cover is taken as an X axis, any radial direction is taken as a Y axis, the X coordinate of the minimum section of the wind collecting cover is 0, the distance from the inlet section of the wind collecting cover to the axis of the minimum section of the wind collecting cover is 9/19 of the length L of the wind collecting cover, and the distance from the outlet section of the wind collecting cover to the axis of the minimum section of the wind collecting cover is 10/19 of the length L of the wind collecting cover.
Determining three coordinate points A (-9L/19, D) of the molded line of the wind-collecting cover according to the diameters and axial lengths of the inlet section, the minimum section and the outlet section of the wind-collecting cover1/2)、B(0,D0/2) and C (10L/19, D)2And/2), the edge straight line of the wind collecting cover is coplanar with the outlet section of the wind collecting cover, and the coordinates of two points of the edge straight line of the wind collecting cover are respectively C (10L/19 and D)2/2) and D (10L/19, D)2/2+L0)。
Drawing an arc through three points A, B, C, connecting the points C and D to obtain a molded line of the wind-collecting cover, and rotating the molded line for 360 degrees along the X axis to obtain the three-dimensional aerodynamic shape of the wind-collecting cover.
3. The design method of the high-efficiency wind collecting cover of the horizontal axis wind turbine as claimed in claim 2, wherein the minimum section diameter D of the wind collecting cover0The ratio of the length of the wind-collecting cover to the length L of the wind-collecting cover is 0.22.
4. The design method of the high-efficiency wind collecting cover of the horizontal axis wind turbine as claimed in claim 2, wherein the diameter D of the cross section of the inlet of the wind collecting cover is larger than the diameter D of the cross section of the inlet of the wind collecting cover1And the minimum section diameter D of the wind-collecting cover0The ratio of (a) to (b) is 1.25.
5. The design method of the high-efficiency wind collecting cover of the horizontal axis wind turbine as claimed in claim 2, wherein the diameter D of the cross section of the outlet of the wind collecting cover2And the minimum section diameter D of the wind-collecting cover0The ratio of (1.32).
6. The design method of the high-efficiency wind collecting cover of the horizontal axis wind turbine as claimed in claim 2, wherein the length L of the edge straight line is L0And the minimum section diameter D of the wind-collecting cover0The ratio of (A) to (B) is 0.075.
CN201910823568.6A 2019-09-02 2019-09-02 Efficient wind collecting cover of horizontal axis wind turbine and design method thereof Pending CN110714875A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111207039A (en) * 2020-02-24 2020-05-29 沈阳永磁电机制造有限公司 Pure square wave permanent magnet wind-collecting type wind power generation system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111207039A (en) * 2020-02-24 2020-05-29 沈阳永磁电机制造有限公司 Pure square wave permanent magnet wind-collecting type wind power generation system

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