Design principle of new vertical axis wind turbine (H type)
In view of the fact that many netizens are interested in the design principle of the new vertical axis wind turbine (H-type), this paper expounds some design principles and technical indicators in detail, hoping to give you a deeper understanding.
The earliest vertical axis wind turbine is an arc double-blade structure (φ type or Darieu). Because of its small wind area and high starting wind speed, it has not been developed vigorously. China has made some attempts in the past few years, but the effect is always unsatisfactory. A friend asked: Why use φ-shaped design instead of the current H-shaped structure? In fact, this is closely related to the development of science and technology, especially the development of computers. Because the design of H-type vertical axis wind turbine needs a lot of stomatal mechanics calculation and digital simulation calculation, it takes at least a few years to calculate by manual method, and the correct result can not be obtained once, so people can't complete this design idea at all in the era when computers are not very developed.
Due to the need of special application, China took the lead in this research in 200 1 and continued to improve the products in the next two years. At the beginning of 2003, the product was mature, and the wind-solar complementary system with this new vertical axis wind turbine as the main equipment was widely used in the island and the frontier.
At present, MUCE and a Japanese company are the main R&D and production units of this product in the world.
Below I will explain in detail the technical principle of H-type vertical axis wind turbine:
I. Technical principle
This technology adopts the principle of blowhole mechanics, and simulates the wind tunnel of vertical axis rotation. The blades are in the shape of airplane wings, so that the wind wheel is not affected by deformation and its efficiency is changed. It is composed of 4-5 vertically arranged blades, and the wind wheel is composed of a connecting rod fixed with a 4-angle or 5-angle hub and connected with the blades. The wind wheel drives the rare earth permanent magnet generator to generate electricity, which is sent to the controller to control and transmit the electric energy used by the load.
According to the gas strip theory and technical principle, the tangent plane perpendicular to the fan shaft can be selected for model calculation. According to the actual size of the blades, the distance between the rotating shafts of each blade is n meters. CFD technology is used to calculate the simulated aerodynamic coefficient, and discrete numerical method is used to solve the aerodynamic force of airfoil section. The grid method is used to compare the vortex distribution of Reynolds number flow, and the main results of numerical simulation calculation of Naville-Stokes equation at high Reynolds number are formed.
Based on the power generation principle of rare earth permanent magnet materials, combined with the mechanics principle of wind wheel and air hole, the direct-drive structure is used to generate power by rotation.
Patented technology: a wind turbine (patent number: ZL20042008 13 10.2).
Second, the power characteristics
According to the principle of H-type wind turbine, the speed of wind turbine increases rapidly (torque increases rapidly), and its power generation speed also increases accordingly, and the power generation curve becomes full (as shown in the following figure). Under the same power, the rated wind speed of the vertical axis wind turbine is smaller than that of the existing horizontal axis wind turbine, and it can also generate more power at low wind speed.
Third, the structure
Because this design structure adopts the mechanical principle of special air holes, the connection mode of triangular vector method and the principle of direct drive structure, the force of the wind wheel is mainly concentrated on the hub, so it has strong wind resistance. The characteristics of this design are also reflected in the impact on the surrounding environment. The advantages of the new vertical axis wind turbine are very obvious because of its noiseless operation and small electromagnetic interference.
Structure diagram of wind power generation system of vertical axis linear blade permanent magnet generator
Attachment: Comparison of existing vertical axis wind sources:
At present, Japan is the largest producer of this type of vertical axis wind power generation system (research began in 2002), and Britain, Canada and other countries are currently developing it. Most of the products in these countries use parallel connecting rods in fan design, which has higher requirements for the output shaft of the generator, relatively complex structure and many on-site installation procedures. In addition, from the mechanical analysis, the greater the power, the longer the blades, the longer the distance between the center point of the parallel rod and the center point of the generator shaft, and the worse the wind resistance. Therefore, MUCE adopts triangle vector method to make up for some of the above shortcomings.