Vertical axis wind turbines do not need to wind when the wind direction changes, at this point relative to the horizontal axis wind turbine is a big advantage, it not only to simplify the structural design, but also reduce the wind wheel when the wind gyroscope.
Although the wind turbine generous, but can be summed up into two categories: ① horizontal axis wind turbine, wind wheel rotation axis and wind direction parallel; ② vertical axis wind turbine, wind wheel rotation axis perpendicular to the ground or air Direction.
There are several types of vertical wind turbine generators with resistance to rotation. There are wind turbines made of flat plates and cups. This is a purely resistant device; the S-type windmill has a partial lift, but mainly a resistance device. These devices have a large starting torque, but the speed ratio is low, in the wind wheel size, weight and cost of certain circumstances, the power output is low.
The Dali-style wind wheel was invented by the French G.J.Madari in the 1930s. In the 1970s, the Canadian National Academy of Sciences conducted a number of studies and was a major competitor to horizontal axis wind turbines. The Darier wind wheel is a lifting device with a curved blade with a low starting speed, but a sharp speed ratio that can be high, with a higher power output for a given wheel weight and cost The There are a variety of Darwin wind turbines in the world, such as Φ type, Δ type, Y type and H type. These wind turbines can be designed as single blades, double blades, three blades or multiple blades.
Other forms of vertical axis wind turbines have a Magnus effect wind wheel, which consists of a spin cylinder, and when it works in the airflow, the resulting force is due to the Magnus effect and its size And wind speed is proportional to. Some vertical shafts use a pipe or vortex generator tower, through the casing or diffuser to make the horizontal air flow into a vertical air flow to increase the speed, even write the use of solar energy or burning a fuel, the horizontal air flow becomes vertical Direction of the air flow.
Due to the characteristics of the H-type vertical shaft fan, the application mode and application field of the wind turbine have changed. Horizontal shaft fans are used in wind farms or remote areas to solve the problem of no electricity due to noise, wind direction and other issues, these applications are far away from the city center area, but the H-type fan will expand the new application areas. For example, in addition to wind farm applications, you can also make full use of the large-scale buildings of the wind and the role of large buildings on top of the space, height, construction of wind power buildings and zero energy building. In this regard, Shanghai has a unique advantage of H-type vertical shaft fan technology, should have the conditions and ability to go in the forefront, and secondly, urban public lighting and highways can also be a large number of wind / light application of wind power generators