KR20020005524A - Half Tube Shaped Vertical Axis Wind Turbine Blade with Vent Groove - Google Patents

Abstract

PURPOSE: A vertical axis wind blade is provided to design a generator of large capacity by easily producing a wind blade, to reduce the whole installing cost by maximizing a rotational torque, and to improve the environmental protection by supplying as an alternative energy source. CONSTITUTION: Turbine blades(11,12) are the same half tube shaped with ventilating grooves(31). The blades are combined with a rotating shaft(15) through a fixing combining member. Blades(13,14) are combined with the rotating shaft(15) at a right angle to the blades(11,12). In rotating the blades, drag is generated at an opposed direction to the rotated direction. By flowing air into the ventilating grooves, the air is flowed smoothly and a vortex is prevented. Thereby, the rotating efficiency is improved.

Description

Half Tube Shaped Vertical Axis Wind Turbine Blade with Vent Groove}

The present invention relates to the shape of the vertical axis wind turbine rotor designed to be used in the wind power generator by maximizing the rotational torque of the vertical axis wind turbine using the drag of the wind.

Conventional wind power generators have a horizontal axis wind turbine (Vertical Axis Wind Turbine) and a vertical axis wind turbine (Vertical Axis Wind Turbine), each of which has advantages and disadvantages. The horizontal type is aerodynamically rotating wind turbine blades using wind lift. The power generation efficiency is high, but the device to change the direction of the rotor blades according to the wind blowing direction and the device to change the angle of the rotor blades according to the wind strength. In case of large capacity, it is limited in size because there is a risk of damage to the equipment due to strong wind, but most of the wind turbines currently in use use this method.

In addition, the vertical Darius Rotor is an aerodynamic wind rotor that uses the lift of the wind. The output of the generator is weak. Is not active. Also, the vertical Savonius Rotor is an aerodynamic wind blade using drag force. Since the rotation speed cannot be higher than the wind speed, it is mainly limited to the rotation speed of the rotating shaft. It is being used as a wind power generator and it is applied to only a small wind power generator because it requires high torque to increase the speed of the transmission.

The technical problem to be achieved by the present invention is to rotate the shape of the rotor blades of the vertical axis wind power generator, which is not actively implemented due to low rotational efficiency, one side to increase the drag coefficient and the other side to minimize the drag coefficient to reverse the center of each other The wind vane shape is designed in a semi-tubular shape so that the difference in drag against the wind in a certain direction is maximized when the position is in the direction, and the rotation torque is maximized around the axis. In order to reduce the drag force, the part of the maximum resistance surface of the rotor blades is made with a part of the wind to solve the vortex phenomenon and the vacuum zone to solve the vortex. Wind turbine blades that can be used for practical applications in vertical axis wind turbines. It will display.

1 is a perspective view showing an embodiment of the invention

2 is a plan view including a partial cross-sectional view of a rotary blade;

3 is a partial cross-sectional view of the rotary blade.

4a is a flow chart of the fluid in the rotary vanes 11

4b is a flow chart of the fluid in the rotor blade 12

5 is in the instantaneous vacuum region formed in the rear of the rotation direction when the speed of the rotary blade increases

Flow chart

6 is an elevational and cross-sectional view of a hemisphere with a vent groove

<Description of Signs of Major Parts>

11,12,13,14: Rotating Wings

15: axis of rotation

21: wind blowing direction

22: clockwise

31: ventilation groove

51: rotation progress direction

In FIG. 1, the rotary blade 11 and the rotary blade 12 are half tube shapes having a ventilation groove 31, which are the same shape, and have a rotation axis perpendicular to the ground so that the cross-sectional shapes are opposite to each other about the rotation axis. It is coupled to a fixed fastener (15), and the rotary blades (11) and (14) orthogonal to the rotary blades (11) and (12) below one end are coupled to the rotary shaft (15) in the same manner.

In FIG. 2, when the wind acts on the rotary blade in a predetermined direction 21, the drag D₁ received by the rotary blade 11 is about twice as high as in the following equation than the drag D₂ received by the rotary blade 12. Since it becomes larger, the rotation torque is generated by the difference in drag, and the rotary blade rotates clockwise (22).

D₁ = ½C₁ρ₁Av² ‥‥‥‥ ①

D₂ = ½C₂ρ₂Av² ‥‥‥‥ ②

D: Drag Force

ρ: air density (ρ₁≥ρ₂)

A: Wind direction area (projection area of wind-driven surface)

V: wind speed

C: drag coefficient

(When Reynolds coefficient ≥ 1000: C ₁ = 2.30)

(When Reynolds coefficient ≥ 1000: C₂ = 1.20)

Substituting the above terms into equations ① and ②

D₁≥1.9D₂

When the cross section receiving the wind of the rotor blade is perpendicular to the wind direction 21 as shown in (Fig. 2), the drag of the rotor blade 11 becomes the maximum, and the rotor blade rotates in parallel with the wind direction, so that the drag becomes the minimum. Orthogonal to each other and the drag of the rotary wing 13 at the lower end is maximized, so that the rotational force continues to occur, thereby making a smooth rotational movement.

At the position where the air resistance of the rotary blade is maximum, as shown in FIG. 3, a ventilation groove 31 having an angle angle (60 ° to 80 °) having a constant angle of meeting on the rear side is formed so as to partially pass the wind, and one wing 11 In Figure 4a, as the wind flows back along the inclined plane in both directions, the wind effect is almost impossible to pass through the ventilation grooves 31 due to the wall effect of the air layers created by collision with each other, thereby reducing the projection area by the ventilation grooves. While there is no drag reduction as much as, on the opposite rotary blade 12, as the wind easily passes through the ventilation groove 31 as shown in FIG. 4B, drag is reduced as much as the projected area of the ventilation groove is reduced. The drag difference is increased so that the rotation torque increases proportionally.

When the rotor blade rotates, a drag that pulls the rotor in the direction opposite to the rotation direction is generated. Since air flows into the ventilation groove 31, the air flows smoothly, thereby eliminating the vortex (swirl) phenomenon opposite to the rotation direction. Prevents the loss of torque,

In addition, when the rotational speed of the rotary blade increases, a momentary vacuum phenomenon occurs in the rear of the rotational direction, thereby causing a drag to reduce the rotational force. As shown in FIG. 5, air flows into the ventilation groove 31, so that the instantaneous vacuum region due to the vacuum effect. (52) is eliminated to prevent the reduction of rotational force to improve rotational efficiency,

It is configured to be used as a high efficiency rotating device for vertical axis wind power generators.

The present invention is simple and easy to manufacture the shape of the wind rotor blades to obtain the rotational force is possible to design a large-capacity generator and can increase the rotation torque as much as possible to lower the overall installation cost and finally lower the cost of power generation Can be enlarged. As the economic feasibility of wind power generators increases, it will be possible to expand the supply of alternative energy, such as the power supply source of islands and the development of coastal districts, and to help the environment as a pollution-free energy source.

And since the present invention is additionally installed on the shaft portion of the existing Darius-type generator (simply attached to the existing shaft), it will be possible to increase the power generation efficiency and to operate the Darius-type generator which is not operated at some economical efficiency.

In addition, since the present invention is additionally installed on the upper part of the existing Savonius-type generator (extending the existing shaft simply attached), the effect of lowering the cost of power generation can be expected.

Claims (3)

In the shape of wind turbine blades that can be used as a rotating device for a vertical wind turbine, a semi-tubular wind turbine rotor such as a drag coefficient on one side and a drag coefficient on the opposite side is small (Fig. 1). Ventilation grooves such as (Fig. 3) made to minimize the drag by removing the vortex caused by the wind and the instantaneous vacuum phenomenon during acceleration According to claim 2, as shown in (Fig. 4a) the wind flowing into the rotor blades come back along the inclined plane in both directions and made to increase the drag by further preventing the wind passing through the ventilation groove (Fig. 3) Slope of the encounter angle of 60 ° ~ 80 °