CN206299520U - A wind wheel with Gurney flap blades for a wind powered water lift machine - Google Patents

Abstract

The utility model is related to a kind of wind wheel with gurney flap blade for wind-driven water pump, it is characterized in that, it is included at trailing edge and is provided with the blade body (2) of gurney flap (1), outer ring wheel rim (3), inner ring wheel rim (4), wheel rim fix bar (5) and wheel hub (6), the quantity of the blade body (2) that gurney flap (1) is provided with trailing edge is 12, respectively it is arranged between inner ring wheel rim (4) and outer ring wheel rim (3), phase difference is 30 degree, wheel hub (6) is connected by wheel rim fix bar (5) with inner ring wheel rim (4) and outer ring wheel rim (3).The utility model can effectively improve the wind energy utilization of the wind wheel with gurney flap blade, increase the power output of wind-driven water pump wind wheel, overcome the shortcomings of existing traditional blades wind wheel.

Description

A wind wheel with Gurney flap blades for a wind powered water lift machine

technical field

The utility model belongs to the technical field of new energy sources, and in particular relates to a wind wheel with Gurney flap blades for a wind-powered water lifter.

Background technique

With the increasingly prominent environmental and energy issues, the role of new energy in today's economic society is becoming more and more obvious. Wind energy is an inexhaustible renewable energy with advantages such as mature technology, relatively low cost, and less impact on the environment. There are two main ways to utilize wind energy: one is to use wind power generation devices to convert wind energy into mechanical energy and then into electrical energy, that is, wind power generation. This method of wind energy utilization has been studied earlier, and a mature wind power theory and industrial model have been formed. However, this kind of wind power generation requires complex control systems and expensive supporting electrical equipment, which limits its development; the other uses mechanical devices to directly convert wind energy into mechanical energy, such as using wind-powered water pumps. As an important form of effectively utilizing wind energy and solving agricultural irrigation problems, wind water pumping is a simple, reliable, practical and efficient application technology. Its mechanical structure is uncomplicated, low in cost, easy to operate and maintain, and does not have very high requirements for annual average wind speed and effective wind speed hours. However, there are still many unsolvable problems in wind water lifting, such as increasing the utilization rate of wind energy of the blades and increasing the output power, etc., which need further research.

In order to reduce the start-up wind speed of the wind-powered water lifter, the number of blades is generally increased. A large number of blades leads to a larger wind rotor, which affects its wind energy utilization rate. In order to improve the wind energy utilization rate of the blades of the wind-driven water pump, many solutions have been proposed: Chinese patent application 201510434944.4 discloses a "wind turbine blade with a serrated blade tip and trailing edge", which has slots on the blade tip and trailing edge , so that the blade tip trailing edge is serrated to reduce noise, but it cannot improve the output performance of the blade, and the process is complicated; Chinese patent application 201520412592.8 discloses a "vertical axis wind turbine blade with guide strips", which A guide bar is installed at 20%, 40%, 60%, and 80% of the span to increase the wind force coefficient, but this can only be used with vertical axis wind turbines, and the application is narrow and the cost is high; Chinese patent application 200410017010.4 is published A horizontal axis wind turbine with blade tip winglets is proposed, and the efficiency of the wind turbine is improved by installing winglets at the blade tips of the wind turbine. However, because the winglets in the literature use airfoils, the structure is more complicated and the process is more , high production cost, and difficult installation; Chinese patent application 200820055227.6 discloses a horizontal axis wind turbine with blade tip winglets, simply installing flat plate-shaped toothed winglets at the blade tips to improve the overall performance of the wind turbine. The optimized winglet shape can adjust the stall speed, but it cannot effectively increase the output power of the fan.

Contents of the invention

The purpose of this utility model is to provide a wind wheel with Gurney flap blades for a wind-powered water pump to overcome the shortcomings of the prior art. The utility model can effectively improve the wind wheel with Gurney flap blades The utilization rate of wind energy is high, the output power of the wind wheel of the wind-powered water pump is increased, and the deficiency of the existing traditional blade wind wheel is overcome.

According to the utility model, a wind rotor with Gurney flap blades for a wind-powered water pump is characterized in that it includes a blade body with a Gurney flap at the trailing edge, an outer rim, an inner The rim, the rim fixing rod and the hub, the number of blade bodies with Gurney flaps at the trailing edge is 12, which are evenly divided between the inner rim and the outer rim, and the phase difference For 30 degrees, the hub is connected with the inner rim and the outer rim through the rim fixing rod.

The realization principle of the utility model is: on the one hand, the utility model increases the curvature of the airfoil trailing edge by setting the Gurney flap at the trailing edge of the blade body, thereby increasing the effective camber of the airfoil and increasing the typical circulation, thereby increasing the lift of the airfoil; on the other hand, after the utility model is provided with a Gurney flap at the trailing edge of the blade body, an alternately shedding Karman vortex street is produced behind the Gurney flap, The alternately shedding vortex street has an inductive effect on the airflow on the upper surface of the airfoil. The air flowing through the suction surface is not separated after passing through the Gurney flap, but the speed increases, which promotes the downward adsorption of the airflow on the trailing edge of the upper surface of the airfoil. The energy flowing on the upper surface of the airfoil is increased, making it easier to resist the reverse pressure gradient, reducing the area of the separation zone on the upper surface of the airfoil, delaying the stall, increasing the stall angle of attack of the airfoil, thereby increasing the lift force coefficient and increasing The lift-to-drag ratio of the airfoil is increased, and the output power of the wind rotor is increased.

Compared with the prior art, the utility model has the following significant advantages:

One is that the wind rotor with Gurney flap blades proposed by the utility model improves the wind energy utilization rate of the blades and increases the output of the wind rotor of the wind water lifter without reducing the number of blades and without affecting the starting wind speed of the wind-powered water lifter. Power, in the range of wind speed 4-10m/s, the output power of the wind rotor is increased by 2.71% on average and 3.17% at the maximum compared with the traditional wind-driven water pump.

The 2nd, the structural design of the wind wheel with the Gurney flap blade proposed by the utility model is completely different from the prior art, see the following table 3 for details; the structure of the wind wheel with the Gurney flap blade proposed by the utility model is simple and reliable , the process is convenient to manufacture, convenient for integrated design, and suitable for large-scale production.

table 3

Description of drawings

Fig. 1 is a three-dimensional schematic diagram of a wind wheel with Gurney flap blades for a wind-driven water pump proposed by the utility model.

Fig. 2 is a three-dimensional schematic diagram of the blade of the Gurney flap proposed by the present invention.

Fig. 3 is a schematic front view of the blade of the Gurney flap proposed by the utility model.

Fig. 4 is when the blade tip angle of attack proposed by the utility model is 9 °, the schematic diagram of the relationship between the incoming wind speed and the output power growth rate of the wind wheel proposed by the utility model; wherein, the blade tip angle of attack refers to the chord and the incoming flow Angle between velocities.

Fig. 5 is a schematic diagram of the relationship between the blade tip angle of attack and the output power growth rate under the condition of a rated wind speed of 8m/s for a wind rotor with Gurney flap blades proposed by the utility model.

Explanation of numbers in Figure 1 and Figure 2: Gurney flap (1), blade body (2), outer rim (3), inner rim (4), rim fixing rod (5), hub ( 6).

detailed description

The specific implementation manners of the present invention will be further described in detail below in conjunction with the drawings and embodiments.

With reference to Fig. 1 and Fig. 2, the present invention proposes a blade with a Gurney flap for a wind-powered water pump, including a blade body (2), and the trailing edge of the blade body (2) is provided with a Gurney flap Wing (1); the section of the blade body (2) adopts an arc-shaped airfoil, the camber is 10% of the chord length, and the tip speed ratio is 1.2; the tip speed ratio refers to the relationship between the linear velocity of the tip and the The ratio of flow velocity; the blade body (2) is a streamlined torsion shape, and the installation angle is set in 10 sections from the blade tip of the blade body (2) to the blade root, and smooth transitions between each section; the blade body ( 2) The parameters of the chord length and installation angle of each section are shown in Table 1.

Table 1

Section number Chord length(mm) Installation angle(°) 1001 195.00 35.00 1002 225.33 33.89 1003 255.67 32.78 1004 286.00 31.67 1005 316.33 30.56 1006 346.67 29.44 1007 377.00 28.33 1008 407.33 27.22 1009 437.67 26.11 1010 468.00 25.00

The Gurney flap (1) of the utility model is distributed along the blade body (2) in the span direction, perpendicular to the chord length of each section of the blade body (2), and the height of the Gurney flap (1) is 2% of the section Chord length, the thickness of the Gurney flap (1) is 2mm; the height parameters of the Gurney flap (1) at each section of the blade body (2) are as shown in Table 2.

Table 2

The specific application effect of the utility model is: within the wind speed range of 4-12m/s, compare the wind wheel provided by the utility model with the unmodified wind wheel of the prior art, and test its output power. The test method uses the test method of changing the incoming wind speed with the load constant to measure the change of the output power of the wind rotor, and the results are shown in Figure 4 and Figure 5. Wherein: as can be seen from Fig. 4, in the range of 4-12m/s wind speed, when the blade tip angle of attack is 9 °, compared with the unmodified wind wheel, the output power of the wind wheel provided by the utility model all has different degrees. increase, the highest growth rate is 2.81%; as can be seen from Figure 5, when the rated wind speed is 8m/s, the output power of the wind wheel provided by the utility model is improved at each blade tip angle of attack, and the highest growth rate is 3.17% .

As can be seen from Example 1, the utility model proposes a wind wheel with Gurney flap blades for wind-driven water lifters, which effectively improves the wind energy utilization rate of the blades without affecting the starting wind speed , increasing the output power of the wind wheel of the wind-powered water lifter.

All descriptions not involved in the specific implementation of the present utility model belong to the known technology in this field, and can be implemented with reference to the known technology.

The utility model has been verified through repeated tests and has achieved satisfactory trial results.

The above specific implementations and examples are specific support for the technical idea of a wind wheel with Gurney flap blades for wind-powered water pumps proposed by the utility model, and the protection scope of the utility model cannot be limited by this. The technical idea proposed by the utility model, any equivalent changes or equivalent changes made on the basis of the technical solution still belong to the scope of protection of the technical solution of the utility model.

Claims (3)

1. a kind of wind wheel with gurney flap blade for wind-driven water pump, it is characterised in that be included in and lattice are provided with trailing edge The blade body (2) of Buddhist nun's wing flap (1), outer ring wheel rim (3), inner ring wheel rim (4), wheel rim fix bar (5) and wheel hub (6), it is described The quantity that the blade body (2) of gurney flap (1) is provided with trailing edge is 12, is respectively arranged on inner ring wheel rim (4) and outer ring Between wheel rim (3), phase difference be 30 degree, wheel hub (6) is by wheel rim fix bar (5) and inner ring wheel rim (4) and outer ring wheel rim (3) Connection.

2. a kind of wind wheel with gurney flap blade for wind-driven water pump according to claim 1, it is characterised in that The section of the blade body (2) uses circular arc aerofoil profile, and camber is 10% chord length, and tip speed ratio is 1.2；The blade body (2) it is streamlined torsional angle shape, point 10 sections set established angle from the blade tip of blade body (2) to blade root, between each section Smoothly transit；The chord length in each section of the blade body (2) and the parameter of established angle are as shown in table 1.

Table 1

Section sequence number Chord length (mm) Established angle (°) 1001 195.00 35.00 1002 225.33 33.89 1003 255.67 32.78 1004 286.00 31.67 1005 316.33 30.56 1006 346.67 29.44 1007 377.00 28.33 1008 407.33 27.22 1009 437.67 26.11 1010 468.00 25.00

3. a kind of wind wheel with gurney flap blade for wind-driven water pump according to claim 1, it is characterised in that , along blade body (2) in opening up to distribution, the chord length with blade body (2) each section is vertical, lattice Buddhist nun's flap for the gurney flap (1) The height of the wing (1) is 2% section chord length, and the thickness of gurney flap (1) is 2mm；Ge Ni at each section of blade body (2) The height parameter of wing flap (1) is as shown in table 2.

Table 2