JP2023078902A - Wind velocity acceleration type wind turbine - Google Patents

Abstract

To provide a wind velocity acceleration type wind turbine that increases wind velocity on a wind turbine back surface and wind velocity at an outlet part of a wind tunnel body, thus improves rotation efficiency of blades, and improves a problem in height of a device, stability of the device, and stability for supporting the wind tunnel body.SOLUTION: A wind velocity acceleration type wind turbine is composed of a front wind tunnel member 22-1 that is composed of a wind tunnel body 22 and a wind turbine 21, and in which the wind tunnel body 22 is formed so as to have a generally longitudinal cross-section and contract its cross-sectional area from a wind inflow port 22a in a straight line or a curved line, and a rear wind tunnel member 22-2 that is formed so as to expand from a position of the contracted cross-sectional area to a wind outflow port 22b in a straight line or a curved line or hold the same cross-sectional area. The wind turbine 21 performs wind velocity acceleration by both a high-speed airflow blowing through space portions on both sides and acceleration of a wind flow scattered in the rear wind tunnel member 22-2 to be low speed and high pressure by a high-speed airflow outside the wind tunnel body 22 and friction.SELECTED DRAWING: Figure 1

Description

The present invention relates to a wind acceleration type wind turbine, which increases the wind speed at the back of the wind turbine and the wind speed at the outlet of the wind tunnel. , relates to a wind acceleration wind turbine with improved stability of the installation and stability of the wind tunnel support.

In recent years, the prevention of global warming has been called for, and the development of new clean energy has become an urgent task. A wind power generation system that does not emit CO ₂ is attracting attention as one of the clean energies. However, although wind power generation is currently under development, it is currently in a low position as an oil alternative energy. We must develop means to effectively capture wind energy.

Conventionally, the main means of supplementing wind energy is wind power generation using a lifting propeller type windmill. In the case of the lift type propeller type wind turbine, there is a problem that the wind turbine itself becomes large because it requires long blades (propeller blades). In addition, its energy efficiency is currently around 40%, that is, it captures around 40% of wind energy. Incidentally, the theoretical maximum efficiency is 59.3% (Betts law).

The aforementioned wind turbines for wind power generation have been developed in the following directions: (1) having blades with as large a rotational diameter as possible; (2) being as tall as possible;

However, increasing the diameter of the rotor blades in order to capture as much wind as possible requires the columns to be taller, making them unstable in strong winds and shutting them down for fear of damage if the wind is too strong. There is a problem that it must be done, and the construction cost is enormous at hundreds of millions of yen.

Occasionally, when people pass through the canyons of buildings and arcades, they encounter unexpectedly strong winds. This is because the wind dammed up by the wall of the building or the like seeks a gap and concentrates in the passable point of the valley or the arcade street. This is considered to be a kind of Laval tube effect. Therefore, a wind power generator has been proposed in which a wind turbine is placed near the center of a Laval tube in which trumpet tubes are connected in the front and rear, that is, in the vicinity of the minimum cross-sectional area (Patent Document 1).

The present inventor provided a partition wall between the fan and the windmill, made a hole in the wall surface, sent air through the hole with the fan, placed the windmill immediately after the hole, and examined the rotation speed of the windmill. As a result, surprisingly, it was found that the number of revolutions of the windmill was much lower than when the wind was sent directly from the fan to the windmill without providing a partition wall. In other words, it was found that not only the amount of wind that hits the front of the wind turbine but also the amount of wind that passes from the periphery of the wind turbine to the back is important for the rotation of the wind turbine. A wind collecting type wind turbine is proposed that increases the power generation efficiency of the wind turbine by sending a large amount of wind power to the back of the wind turbine (Patent Document 2).

The wind collecting wind turbine described above functions according to the principle described below. Let V be the velocity of the air passing through the windmill, ^ρ be the density, and P be the pressure. Decrease and increase kinetic energy. This is a reduction in entropy (S) because it is a rectification (opposite of randomization) of V,P. Therefore, the free energy increases by -TΔS (T: temperature). Therefore, the wind collecting type has higher energy efficiency. However, this is the case assuming steady flow in a Bernoulli tube. If you put a windmill on it and extract the energy, V behind the windmill will decrease and P will increase. Therefore, in order to make this flow closer to a steady flow, it is necessary to increase the speed of the low-speed flow by the friction of the high-speed flow measured externally. In other words, the air molecules behind the wind turbine, which are slowed down by the high-speed air molecules, are pushed backward (Patent Document 3).

Furthermore, in order to blow out the air molecules behind the wind turbine, a gap is provided on both sides of the wind turbine installed inside the intermediate wind fuselage, or both sides and both sides of the wind turbine and the top and bottom sides to allow the wind to blow through. It is effective to blow air (Patent Document 4).

Japanese Patent Application Laid-Open No. 2008-520900 JP 2011-140887 A Japanese Patent No. 6033870 Japanese Patent No. 6110455

The basic idea of the present invention is based on the aforementioned Patent Document 3 and Patent Document 4. The details are described below.

When people pass through the canyons of buildings and arcade streets, they often encounter unexpectedly strong winds. This is because the wind dammed up by the wall of the building or the like seeks a gap and concentrates in valleys and passable points of the arcade street. If the density of passing air is ρ and the wind speed is V, the wind energy per unit volume is (1/2) ρV ² +P = constant. is only pressure, and high-pressure air walls are generated on both sides of the inlet such as a valley. It is thought that this serves as a wind tunnel duct and increases the wind speed.

Therefore, as shown in FIGS. 9A and 9B, the fan 11 (φ=240 mm) and the wind turbine 12 (φ150 mm) are arranged at an interval of about 750 mm, and the rim of the wind inlet of the wind turbine 12 is Flange-shaped wall members 13a and 13b were provided on the outside, respectively, and the number of revolutions of the windmill 12 when air was blown from the electric fan 11 was observed. The outer diameter of the wall member 13a is larger than the air flux of the electric fan 11, and the outer diameter of the wall member 13b is smaller than the air flux of the electric fan 11.例文帳に追加Although not shown, the number of rotations was also observed in the same manner when the wall member was not provided.

As a result, when the wall member 13a was provided (FIG. 9A), the rotational speed of the wind turbine 12 was significantly lower than when the wall member was not provided. This is because the air source is a fan, and basically only the wind flux corresponding to the diameter of the blades of the fan 11 can be obtained. This is because the air flow to the air is completely blocked. Further, when the wall member 13b was provided (FIG. 9B), the number of revolutions of the wind turbine increased more than when the wall member 13a was provided. is provided, part of the airflow flows to the back of the windmill, which pulls the wind passing through the windmill 12 and increases its speed.

When the wind passes through a windmill, it loses energy and slows down the wind. This means that the temperature drops in terms of molecular kinetics. The above experiment shows that the reduced energy of the wind flow behind the wind turbine is compensated by mixing and friction with the air flow with high dynamic pressure and kinetic energy on the outside, and the speed of the wind flow behind the wind turbine increases. . As a result, it can be seen that it is important to forcibly expel the wind passing through the windmill to the rear of the windmill in order to increase the rotation speed of the windmill.

In view of the above circumstances, the present invention aims to solve the problems of the prior art by increasing the wind speed at the back of the wind turbine and at the outlet of the wind tunnel, thereby improving the rotational efficiency of the wind turbine. The object of the present invention is to provide a wind speed acceleration type wind turbine which can increase power generation and improve the problem of device height, installation stability and wind tunnel support stability.

The wind speed accelerating wind turbine of the present invention for achieving the above object comprises a wind tunnel body and a wind turbine. and a substantially rectangular cross-sectional rearward member formed so as to expand linearly or curvilinearly from the position of the reduced cross-sectional area to the wind outlet or maintain the same cross-sectional area. and a wind tunnel member, wherein the wind turbine is installed in a reduced portion having a substantially rectangular cross section with space portions formed on both sides thereof (Claim 1).

The substantially rectangular cross-sectional shape includes an elliptical shape having long sides and short sides, and other polygonal shapes. In the present invention, by making the wind tunnel body substantially rectangular in cross section, compared to the case where the wind tunnel body is circular or square, the wind velocity flowing along the sides of the wind turbine does not escape to the space on both sides of the wind turbine. It is possible to effectively knock out the airflow whose speed has been reduced behind the windmill by supplying the airflow, thereby recovering the velocity energy of the airflow behind the windmill.

In the present invention, when wind is received from the wind inlet, the wind passes through the front wind tunnel member and reaches the windmill installed in the reduced portion having a substantially rectangular cross section to rotate the windmill. At the same time, high-speed air currents blow through from the spaces on both sides of the windmill. Then, the low-speed airflow behind the windmill whose energy has been deprived by the windmill is beaten out by the high-speed airflow blowing from the spaces on both sides of the windmill to recover the velocity energy of the airflow behind the windmill. As a result, the front wind tunnel member formed so that the cross-sectional area decreases linearly or curvilinearly from the wind inlet to the position where the wind turbine is installed increases the speed of the wind, guides it to the wind turbine, and blows the wind turbine. The passing wind is increased in volume and velocity and delivered to the rear wind tunnel.

Next, the wind that has passed through the windmill is supplied to the rear wind tunnel member. The rear wind tunnel member is formed so that the reduced cross-sectional area expands linearly or curvilinearly from the position where the wind turbine is installed to the wind outlet, or maintains the same cross-sectional area. The wind that has passed through the wind turbine supplied to the rear wind tunnel member is brought into contact with the faster, lower pressure airflow that blows through the outside of the rear wind tunnel member, and is supplied by mixing, friction, and absorption. , drags the higher pressure wind in the rear wind tunnel out of the wind outlet, again increasing the volume and velocity of the wind passing through the windmill. That is, the present invention increases the wind speed behind the wind turbine by two-step wind speed acceleration, thereby improving the rotation efficiency of the wind turbine and increasing the power generation efficiency. The configuration, operation and effects of the present invention do not change whether the wind tunnel is arranged horizontally or vertically. Thus, device height issues, installation stability and wind tunnel support stability are improved.

In one embodiment of the present invention, the distance between the wind turbine and the long side of the wind tunnel is minimized, the ratio of the short side to the long side of the wind tunnel is 1 to 10 times, and the outlet of the rear wind tunnel member is It is characterized in that the ratio of the short side portion to the long side portion of the portion is 1 to 10 times (Claim 2). In the present invention, the high-speed airflow that blows through the space on both sides of the wind turbine and the high-speed airflow outside the wind tunnel member, which has been diffused by the rear wind tunnel member and become low speed and high pressure, are accelerated by friction with the high speed wind flow outside the wind tunnel. The velocity energy of the airflow behind the windmill can be effectively recovered by blowing out the airflow whose energy has been deprived by the windmill and whose speed has decreased behind the windmill. For example, in order to increase the friction of the wind flow inside and outside the wind tunnel at the outlet of the rear wind tunnel member, the perimeter with respect to the cross-sectional area must be increased. It is better to be rectangular than square and circular (because the perimeter increases more than the area). In the above ratio of 1 to 10 times, if the above ratio exceeds 10 times, the increase in perimeter/area ratio with respect to the area does not become large. In addition, if it exceeds 10 times, there arises a problem that the size of the device is increased.

Another embodiment of the present invention is characterized in that a wind dispersing portion is formed on the rim of the wind outlet of the rear wind tunnel member (Claim 3). By constructing a wind dispersing part at the rim of the wind outflow outlet of the rear wind tunnel member, the wind outside the wind tunnel is dispersed, and the contact area between the wind outside the wind tunnel and the wind from inside the wind tunnel is large. The increased wind in the wind tunnel can be forced out of the wind outlet of the rear wind tunnel member to increase the volume and speed of the wind passing through the wind turbine. Note that the shape of the dispersed portion is not limited. The wind flowing outside the wind tunnel is dispersed by the dispersion part, and the contact area between the dispersed wind and the wind flowing out from the wind outlet of the rear wind tunnel member can be increased, thus promoting the mixing of the wind and eventually the outflow. The shape is not limited to the above as long as the shape can increase the wind speed.

An embodiment of the present invention is characterized in that hydraulic power can be used (claim 4). Although the use of wind power has been described above, the wind speed acceleration type wind turbine of the present invention can use water power as it is, and can function as a water speed acceleration type water turbine.

According to the present invention, the wind speed at the back of the wind turbine is increased and the wind speed is increased at the outlet of the wind tunnel. It is possible to provide a wind acceleration type wind turbine with improved installation stability and wind tunnel support stability.

1 is a perspective view of a wind acceleration type wind turbine of the present invention; FIG. FIG. 3 is an end view of the wind turbine installation position of the wind tunnel; FIG. 11 is a perspective view showing another embodiment of the present invention; It is a front view which shows the example of a star-shaped dispersion|distribution part (a), (b), (c). It is a front view of a collar-like dispersion|distribution part. It is the side view and front view of a notch-like projection dispersion|distribution part. 1 is a front view of a gear-shaped dispersing section; FIG. It is a front view explaining the magnitude|size of a star-shaped dispersion|distribution part. It is an experimental figure of wind turbine efficiency.

An embodiment of the present invention will be described below based on the drawings.

FIG. 1 is a perspective view of a wind acceleration type wind turbine according to the present invention, and FIG. 2 is an end view of the installation position of the wind turbine in a wind tunnel. In the figure, 21 is a windmill, 22d is a contraction part, 22 is a wind tunnel body, 22-1 is a front wind tunnel member, 22-2 is a rear wind tunnel member, 22a is an air inlet, 22b is an air outlet, and S is a wind turbine. 21 are space portions formed on both sides.

In the present invention, the wind tunnel body 22, that is, the front wind tunnel member 22-1 and the rear wind tunnel member 22-2 are each formed to have a substantially rectangular cross section. Note that the substantially rectangular cross-sectional shape includes an ellipse having long sides and short sides, and other polygonal shapes. In the figure, 23 is the long side, 24 is the short side, 26 is the long side of the outlet of the rear wind tunnel member 22-2, and 27 is the short side of the outlet of the rear wind tunnel member 22-1. is.

Further, the front wind tunnel member 22-1 is formed to have a cross-sectional area that is linearly or curvilinearly reduced from the wind inlet 22a, and the rear wind tunnel member 22-2 is the front wind tunnel member 22-1. It is formed so as to expand linearly or curvilinearly from the position of the reduced cross-sectional area to the air flow outlet 22b, or keep the same cross-sectional area. The wind turbine 21 is installed in a reduced portion 22d having a substantially rectangular cross section with a space portion S formed on both sides thereof. The distance between the wind turbine 21 and the long side portion 23 of the wind tunnel body 22 is minimized, and the ratio of the short side portion 24 to the long side portion 23 of the wind tunnel body 22 is set to 1 to 10 times. Further, the ratio of the short side portion 27 to the long side portion 26 of the outlet portion of the rear wind tunnel member 22-2 is set to 1 to 10 times.

FIG. 3 shows an embodiment in which a dispersion portion 25 for dispersing the wind outside the wind tunnel body 22 is formed at the rim of the wind outlet 22b of the rear wind tunnel member 22-2. In the figure, a notch-shaped projection dispersion portion, which will be described later, is formed as the dispersion portion.

Examples of the dispersion portion include the star-shaped dispersion portion shown in FIGS. 4A, 4B, and 4C, the flange-shaped dispersion portion shown in FIG. Shape dispersions and the like are conceivable, but are not limited to these shapes.

As an example of the star-shaped dispersion part in FIG. 4, there are a hexagonal shape, an octagonal shape, a 16-channeled shape, etc., as shown in FIGS. Incidentally, as shown in FIG. 8, the area of the circle drawn by the outer circumference circle D connecting the outermost part of the star-shaped dispersion part is at least twice the area of the circle drawn by the outer diameter d of the wind outlet 22b of the wind tunnel body 22. preferable.

Moreover, in order to make the pressure loss by the dispersing part 25 a resistance that does not hinder the inflow of the wind into the outer wind tunnel, it is preferable to make the area of the dispersing part 25 smaller than the area of the portion through which the wind passes. In FIG. 8 , the outer circle drawn with dotted lines is the virtual diameter of the circle connecting the vertices of the star-shaped dispersion part, and the inner solid line circle is the outer diameter of the wind outlet 22b of the wind tunnel body 22 . It is preferable that the area of the star-shaped dispersion portion is less than half the area of the other portion in the circular belt-like space sandwiched between the virtual circular diameter D and the outer diameter d of the air outlet.

A gear shape is also possible as shown in FIG. Other than this, corrugated and brim-shaped can also be used, but are not limited to these. A perforated plate type is also applicable, but a design that does not increase the pressure loss is required.

5, the height of the flange is 1/10 to 1/5 of the difference between the outer diameter D of the flange and the inner diameter d of the air outlet 22b. Preferably.

In the case of the notch-like protrusion dispersion part shown in FIG. 6, the notches are not limited to being continuous and may be spaced apart. A degree exceeding half of the area of the part is preferable.

In each of the configurations described above, when wind is received from the wind inlet 22a, the wind is supplied from the front wind tunnel member 22-1 to the windmill 21 of the reduced portion 22d. At the same time, high-speed air currents blow through the spaces S formed on both sides of the windmill 21 . Then, the high-speed airflow that blows through the space S on both sides of the windmill 21 blows out the airflow whose energy has been deprived of energy by the windmill 21 and whose speed has decreased at the back surface of the windmill 21 to the rear wind tunnel member 22-2, thereby causing the windmill 21 back surface. Attempts to recover the velocity energy of the airflow.

Next, the airflow supplied to the rear wind tunnel member 22-2 is brought into contact with the faster, lower pressure airflow that blows through the outside of the rear wind tunnel member 22-2, and the mixture, friction, and absorption reduce the speed and speed of the airflow. The higher pressure wind in the rear wind tunnel member is dragged out from the wind outlet to increase the volume and speed of the wind passing through the windmill 21 again. That is, the present invention increases the wind speed behind the wind turbine 21 by two-stage wind speed acceleration, thereby improving the rotation efficiency of the wind turbine 21 and increasing the power generation efficiency.

Industrial field of application

The present invention consists of a wind tunnel and a wind turbine, and increases the wind speed at the back of the wind turbine and at the outlet of the wind tunnel. Due to the improved stability of the installation problem, the stability of the installation and the stability of the wind tunnel support, it has great applicability in technical fields requiring high wind energy, such as wind power generation.

21 Windmill 21d Reduced portion 22 Wind tunnel body 22-1 Front wind tunnel member 22-2 Rear wind tunnel member 22a Wind inlet 22b Wind outlet 23, 26 Long side 24, 27 Short side 25 Dispersion part

Claims (4)

The wind tunnel is composed of a wind tunnel and a wind turbine, and the wind tunnel has a substantially rectangular cross-sectional area, and the cross-sectional area is reduced linearly or curvilinearly from the wind inlet, and the front wind tunnel member with the reduced cross-sectional area. a rear wind tunnel member having a substantially rectangular cross section formed so as to expand linearly or curvilinearly from the position to the wind outlet or maintain the same cross sectional area, and the wind turbine has spaces on both sides. A wind speed acceleration type wind turbine, characterized in that it is installed in a reduced part having a substantially rectangular cross section by forming a part. The distance between the wind turbine and the long side of the wind tunnel is minimized, the ratio of the short side to the long side of the wind tunnel is 1 to 10 times, and the short side and long side of the outlet part of the rear wind tunnel member are 2. The wind acceleration type wind turbine according to claim 1, wherein the ratio of the parts is 1 to 10 times. 3. The wind accelerating wind turbine according to claim 1, wherein a wind dispersing portion is formed at the rim of the outflow port of the rear wind tunnel member. 4. The wind acceleration type wind turbine according to claim 1, wherein hydraulic power can be used.

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