A vertical axis wind turbine is a device that utilizes wind energy to convert it into electricity. Unlike the traditional horizontal axis wind turbine, the main body of the vertical axis wind turbine presents a vertical state.
1.Vertical axis wind turbine working principle
Vertical-axis wind turbines utilize wind power to drive the blades to rotate, which in turn drives the generator to generate electricity. Its main components include the main shaft which is upright in the vertical direction, the rotor which is surrounded by blades, and the generator which is located on the top of the main shaft.
2.Types ofvertical axis wind turbines
According to the working principle of aerodynamics is divided into drag type and lift type.
(1) Drag type vertical axis wind turbine
Resistance type wind turbine is due to the wind turbine blade in the windward direction of the shape of the asymmetric, due to its air resistance is different, thus generating a moment around the central axis, so that the wind wheel rotation.
Main types: barrier plate type wind turbine, plate swing-rotating wind turbine, wind cup type wind turbine, S-type wind turbine.
(2) Lift type vertical wind turbine
The lift type wind turbine utilizes the lift force generated by the air flowing through the blades as the driving force to turn the wind turbine and generate electricity.
Main types: Darrieux wind turbines (H-type and Φ-type are the most representative).
About the advantages and disadvantages of vertical axis wind turbines
Wind turbine generators can be broadly divided into the following important components: center support, fixed blade auxiliary support, wind turbine hub, blades, gearbox and so on. In the world, it is common to divide wind turbines into two main categories: horizontal axis wind turbine and vertical wind turbine. Today, we will talk about the advantages and disadvantages of vertical wind turbine.
Advantages of vertical wind turbine
1.High overall performance index. In the construction of the use of straight blades and triangular double pivot design, and the main stress point is concentrated in the hub, to solve the blade falling off, breakage and blade flying out and other problems, vertical wind turbineblade according to the same angle difference to form a circle, the purpose of such a design can reduce the pressure on the center bracket; In addition, the gear box, reducer and transmission device and a series of auxiliary equipment can be placed in the ground relatively close to the working platform.
Reduce the weight of the wind turbine itself, and to a certain extent reduce the construction and maintenance costs, and vertical wind turbinecan be utilized in the building integration, and to a certain extent reduce the construction and maintenance costs. The working platform, reducing the weight of the wind turbine itself, to a certain extent, reducing the construction and maintenance costs of the wind turbine, and the vertical wind turbines can be utilized in the construction of integrated, conducive to urban construction.
2.Reduce noise pollution. The use of horizontal rotation and the application of the principle of airplane wing design of the blades, so that the noise is reduced to the extent that it can not be measured in the natural environment.
3.No need to install auxiliary systems. Vertical wind turbinesand horizontal axis wind turbine compared to the vertical wind turbines, due to the vertical axis wind turbine blade rotation plane parallel to the ground, so that the acquisition of wind energy can come from all directions, do not need to increase the yaw device to adjust the direction of the wind energy received as the horizontal axis wind turbine, the overall structure of the wind turbine has become more simple, to a certain extent, reduces the vibration generated by the wind turbine operation, improve its reliability.
4.Strong wind resistance. Horizontal rotation and triangular double pivot design principle make it subject to low wind pressure and can resist typhoons of 45 meters per second.
5.Simple blade construction. Due to the vertical wind turbinesblade on the wind energy capture capacity has been enhanced, the blade by the wind when rotating only by the pressure of the wind turbine and rotating centrifugal force on the blade of the tension, so the degree of requirements on the blade material to reduce the selection of materials more general, reducing the cost of purchasing the blade.
6.The speed range becomes larger. vertical wind turbinescompared to the horizontal axis wind turbine, the ideal speed can be achieved than the horizontal axis wind turbine is much higher, in the strong wind speed operation stability than the horizontal wind turbine, the ideal value can withstand 60m / s of high strength wind speed. As long as the control strategy and the materials of the turbine itself are properly selected, the utilization of wind energy by vertical wind turbines is much greater than that of horizontal wind turbine.
Since in vertical axis wind turbines the blades are wrapped around the shaft, they are usually safer for birds. In horizontal wind turbine, the blades spinning in the air can cause various problems for birds.
Also,vertical axis wind turbines have the following disadvantages:
1. Lower efficiency and weaker power generation capacity;
2. There is a small amount of noise, which has an impact on the surrounding environment;
3.High maintenance cost and relatively short service life.
4.Vertical-axis wind turbineshave poorer start-up performance indicators than horizontalwind turbine
5.Anti-vibration problems, especially for large wind turbine
Fields of application
Due to the characteristics of the H-type vertical axis wind turbines, the way in which wind turbines are used and the areas in which they are used have changed. Horizontal wind turbine are either used in wind farms or in remote areas to solve the problem of lack of electricity due to the noise and wind direction, which are far away from urban centers, but the H-type wind turbines will be expanded to new application areas.
For example, in addition to wind farms, wind power buildings and zero energy buildings can be constructed by making full use of the wind collection function of large buildings and the space and height of the top floors of large buildings. City public lighting and highways can also be wind / light through the complementary approach to a large number of wind turbine applications.
In addition, enterprises and institutions with wind resource conditions can also apply H-type vertical axis wind turbines in large quantities, such as seawater desalination units by the sea, oil field oil extractors and offshore drilling platforms.
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