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Double-half-vane type low-speed starting lift-to-drag interconversion type wind rotor system of vertical-axis wind turbine

A low-speed start-up, vertical axis technology, applied to the direction of engines, engine components, wind turbines, etc., can solve the problems of air pressure drop on the pressure surface of lift-type blades, can not completely guarantee the elimination of dead spots, and disturb the airflow distribution, etc., to achieve low start-up wind speed, High wind energy utilization efficiency, the effect of wind energy utilization efficiency improvement

Inactive Publication Date: 2015-01-07
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

While causing additional power loss, the rotation of the drag blade disrupts the original airflow distribution in the entire flow field, causing a drop in air pressure on the pressure surface of the lift blade.
The lift-type blades are more sensitive to changes in the flow field, and changes in the flow field and pressure bring about a decrease in aerodynamic efficiency. As a result, at higher wind speeds, this type of lift-drag combined wind turbine system is more efficient in utilizing wind energy than the lift-type wind turbine system. lower wheel system
In addition, the design of the two resistance blades in the patent (CN103527403A) cannot completely guarantee the elimination of the dead point when starting

Method used

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  • Double-half-vane type low-speed starting lift-to-drag interconversion type wind rotor system of vertical-axis wind turbine
  • Double-half-vane type low-speed starting lift-to-drag interconversion type wind rotor system of vertical-axis wind turbine
  • Double-half-vane type low-speed starting lift-to-drag interconversion type wind rotor system of vertical-axis wind turbine

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Experimental program
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Effect test

Embodiment 1

[0025] Such as Figures 1 to 5 Shown is the double-half-blade low-speed start-up-drag interchanging blade vertical-axis fan wind wheel system of the present invention. The wind wheel system consists of a main shaft 1, a variable blade 3 and a connecting rod 4. The variable blades 3 are evenly distributed along the circumference of the main shaft 1, and the number is three to six, and are installed on the main shaft 1 through the connecting rod 4. The variable blade 3 includes a first blade 3 - 1 and a second blade 3 - 2 , and the second blade 3 - 2 is connected to the first blade 3 - 1 through a leading edge rotating shaft 8 . The connecting rod 4 includes an upper connecting rod 4-1 and a lower connecting rod 4-2, both of which are installed in parallel. One end of the upper connecting rod and the lower connecting rod is respectively connected to the upper and lower parts of the first blade 3-1 through a fixed rotating shaft 6, and the other end Both are connected to spindl...

Embodiment 2

[0030] Such as Figure 6 and Figure 7 As shown, another layout of the present invention is a two-half-blade low-speed start-up lift-drag interchanging blade vertical axis fan wind wheel system, and a lift-type blade 2 is added between the variable blade 3 and the main shaft 1 . The lift type blades 2 are evenly distributed along the circumferential direction of the main shaft, and the number is also three to six. When the number of lift type blades 2 is the same as or half of the number of variable type blades 3, the variable type blades 3 and the lift type blades 2 share the connecting rod 4 and are connected with the main shaft 1; When the number is different and not half of it, then an auxiliary connecting rod is additionally provided, and the lift type blade 2 is connected with the main shaft 1 through the auxiliary connecting rod 5 . Wherein when the number of variable blades 3 is half of the number of lift type blades 2, that is, when the number of lift type blades is...

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Abstract

The invention discloses a double-half-vane type low-speed starting lift-to-drag interconversion type wind rotor system of a vertical-axis wind turbine. The wind rotor system comprises a spindle, connecting rods and variable type vanes. Each connecting rod includes an upper connecting rod and a lower connecting rod. The variable type vanes are connected to the spindle through the connecting rods and include first vanes and second vanes. The tops and the bottoms of each first vane are connected with the first connecting rod and the second connecting rod through a fixing rotary shaft. The second vanes are connected with the first vanes through front edge rotary shafts. Opening-closing portions are formed between the first and the second vanes. Lift type vanes are added between the spindle and the variable type vanes. According to the arrangement, automatic conversion between the drag type and the lift type of the variable type vanes are achieved, to be specific, the variable type vanes extend to be the drag type vanes in the case of low wind speed and automatically shrink to be the lift type vanes in the case of high wind speed. In this way, the advantages of the drag type vanes that starting torque is large and starting wind speed is low and the advantages of the lift type vanes that aerodynamic efficiency is high are scientifically and organically integrated. Thus the design goals of low-speed starting and efficient running are realized.

Description

technical field [0001] The invention relates to a vertical-axis fan rotor, more specifically a half-blade low-speed starting lift-drag interchanging blade vertical-axis fan rotor system, which belongs to the technical field of wind power generation. Background technique [0002] Wind energy resources have the advantages of wide distribution, abundant reserves, clean and renewable, etc. Under the international background of increasingly shortage of fossil energy such as coal and oil, and deteriorating environment, the development and utilization of wind energy resources has increasingly attracted extensive attention and continuous investment from all countries in the world. Wind power technology and industry have developed rapidly around the world. In the field of grid-connected large-scale wind power generation technology, the horizontal axis fan is the most widely used in the world at present. Its technology is relatively mature and its production volume is large. It has be...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F03D3/06
CPCY02E10/74F03D3/062F05B2240/211
Inventor 苏银海熊源泉王颖张亚玺宋杰张理吴波张书平王金涛茹晋波
Owner SOUTHEAST UNIV
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