JP2008196425A - Wind and hydraulic power generator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wind and hydraulic power generator capable of operating at a high speed by creating Coanda effect by a shape of a nacelle to increase speed of fluid and apply the same on a propeller. <P>SOLUTION: This wind and hydraulic power generator 1 is provided with the propeller 5 in a rear part of the nacelle 3 rotatably provided on a column 2. High speed fluid flow faster than flow speed caused by Coanda effect is generated on a circumference surface of the nacelle, and is made pass through to a front surface of the propeller 5. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a wind-hydraulic power generator, and more particularly, to a wind-hydraulic power generator capable of rotating at a high speed by guiding a wind flow higher than the wind speed to a propeller.

Conventionally, the wind turbine generator has a wind turbine efficiency of 45% when it receives a numerical value of 100 wind power. This is due to a mechanical loss that rotates in a right-and-left direction by receiving wind in front of the propeller, air resistance during rotation, and frictional resistance loss due to the transmission mechanism.
Therefore, in order to obtain a large amount of wind power, there is an object such as Patent Document 1 in which a wind collecting plate or the like is disposed in front of the windmill. In addition, there is a type in which a propeller is disposed at the rear part of the nacelle as in Patent Document 2.
JP 2003-83231-A JP 2006-152957 A

In the conventional windmill, when the wind collecting plate is arranged, the wind collecting plate must be moved in accordance with the wind direction when the wind direction changes. In the small propeller type windmill, the wind collecting plate is arranged in front of the propeller. When it becomes heavy as a whole, it becomes difficult to support the column. In addition, the nacelle of Patent Document 2 has the same overall thickness on the side surface, and the tip is tapered so that the air can be ventilated.
An object of the present invention is to provide a wind power generator capable of creating the Coanda effect by the shape of the nacelle, speeding up the fluid, applying it to a propeller, and rotating the fluid at high speed.

  The specific contents of the present invention are as follows.

  (1) A wind-hydraulic power generator in which a propeller is disposed at the rear part of a nacelle that is pivotably disposed on a support column, and a high-speed fluid flow that is higher than the flow velocity generated by the Coanda effect is generated on the circumferential surface of the nacelle. A wind-hydraulic generator that passes through the front of the propeller.

  (2) A wind-hydraulic generator in which a propeller is disposed at the rear of a nacelle that is pivotably disposed on a support column. The nacelle has a spherical tip, and the maximum diameter of the tip edge is immediately before the propeller. Formed to be 2 to 5 times the diameter of the nacelle rear end, and the fluid in contact with the tip of the nacelle causes the Coanda effect to flow at high speed along the circumference of the nacelle to the propeller front Wind generators that have been.

  (3) The wind turbine generator according to any one of (1) and (2), wherein the nacelle has a semi-spherical tip.

  (4) The nacelle is arranged so that the surrounding wall covers the propeller via the supporting arm at the rear part, and the rudder that projects obliquely outward and rearward is integrally formed on the left and right rear parts of the surrounding wall. The wind-hydraulic generator described in any one of (1) to (3).

  (5) The propeller blade of the propeller is formed such that the chord length of the blade tip edge is wider than the chord length of the blade root, and an inclined portion inclined forward is formed at the blade tip. The wind-hydraulic power generator according to any one of (1) to (4), wherein an area on the right side in the rotation direction is wider than that on the left side from the line.

  (6) The wind turbine generator according to any one of (1) to (5), wherein the propeller has a diameter set in a range of 100% to 250% of a maximum diameter of the nacelle.

  (7) In the nacelle, the propeller blade, and the surrounding wall, the front surface portion where the fluid hits is a smooth surface, and the rear surface is a rough surface. The wind-hydraulic generator described in any one.

  The present invention has the following effects.

  (1) When the hydrodynamic power generator of the invention described in claim 1 receives fluid at the tip of the nacelle, the fluid is compressed at the tip of the nacelle due to the Coanda effect, and the fluid having a high density is applied to the peripheral surface of the nacelle. Therefore, the propeller receives a fluid having a higher speed than the fluid flow on the front surface of the nacelle and rotates at a high speed.

  (2) Since the difference between the maximum diameter of the front edge portion of the nacelle and the diameter of the rear portion of the wind-hydraulic power generator of the invention described in claim 2 is large, the fluid hitting the front surface has a high compression effect. Since the Coanda effect is also increased, a high-speed fluid flow can be passed along the peripheral surface of the nacelle.

  (3) Since the front end portion of the nacelle has a spherical shape in the wind-hydraulic generator according to the invention described in claim 3, the fluid that strikes the front surface has a high compression effect, and the Coanda effect thereby increases. A high velocity fluid stream can be passed along the plane toward the propeller.

  (4) Since the rudder is formed on both sides of the rear part of the wind-hydraulic power generator of the invention described in claim 4, the direction is changed sensitively to the change of the direction of the fluid flow at the time of light wind, The nacelle can be directed above the flow.

  (5) In the wind turbine generator according to the fifth aspect of the invention, since the area of the blade tip inclined portion of the propeller blade is set larger on the right side than the central left side, the propeller blade is rotated in the direction of rotation. When rotating to the right, the relative flow hitting the propeller blades can be quickly passed backwards to reduce the resistance.

  (6) The hydrodynamic power generator of the invention described in claim 6 can reduce the diameter of the propeller, and can obtain a high-speed flow due to the Coanda effect of the nacelle and rotate at a high speed even if the propeller diameter is small. To increase power generation efficiency.

  (7) Since the hydrodynamic power generator of the invention described in claim 6 is formed in a rough surface except for the front surface where the fluid hits, the fluid flowing along the peripheral surface by the Coanda effect increases the viscosity. To enhance the Coanda effect.

   In this invention, a nacelle is pivotably arranged on a support column, a propeller is arranged at the rear part of the nacelle, and the shape of the nacelle is formed into a thick, generally fish shape at the front part where the Coanda effect occurs. The diameter of the largest part of the material or 2.5 times the diameter.

FIG. 1 is a side view of a wind power generator according to the present invention, FIG. 2 is a plan view, and FIG. 3 is a front view. Here, the fluid is described as wind.
In the figure, the wind power generator 1 is provided with a nacelle 3 on a support column 2 so as to be rotatable.

  As shown in the drawing, the side surface of the nacelle 3 has a thick front portion and gradually narrows backward, and is formed in a substantially fish-like shape of a tuna shape. For example, a large difference is formed such that the diameter of the front edge of the nacelle 3 is 25 cm and the diameter of the rear end of the nacelle 3 is 6 cm. Adhesion flow phenomenon) occurs.

Inside the nacelle 3, a generator (not shown), a transmission connected thereto, and an output shaft 4 are arranged in a conventional manner, and a propeller 5 is arranged at the rear end of the output shaft 4. . The propeller blade 6 of the propeller 5 is formed with an inclined portion 6a whose tip is inclined 45 ° forward.
The number of the propeller blades 6 is about 2 to 6, and the chord length has a wide tip. This chord length can be 30% to 60% of the radius of the propeller 5.

On the rear edge of the nacelle 3, a surrounding wall 8 for preventing airflow diffusion is disposed so as to surround the propeller 5 via a plurality of support arms 7 facing in the radial direction.
As shown in the cross section of FIG. 1, the support arm 7 has a thick front portion, a bulge on both sides, and a gradually decreasing thickness toward the rear so that the Coanda effect occurs. The airflow hitting the front part of the support arm 7 is compressed at the front part, and passes rearward on both sides at high speed. There is no turbulent flow at the site where the Coanda effect occurs.

  As shown in the figure, the surrounding wall 8 is formed so that the front portion has a thick plate thickness, bulges inward, and gradually becomes thinner toward the rear so that the Coanda effect occurs on the longitudinal side surface as shown. A rudder 9 is integrally formed on the left and right rear portions of the surrounding wall 8 so that the rear portion is inclined outward.

  The surrounding wall 8 and the rudder 9 can be obtained by, for example, covering a foamed polystyrene resin molded body with an FRP resin film using carbon fiber, glass fiber, or the like, which is lightweight and excellent in rigidity.

  FIG. 4 is a plan view showing a wind flow change in the wind hydraulic generator 1 of the present invention. In the sea, tuna and swallows can swim overwhelmingly at high speed. This is because the tuna body shape is like a torpedo, the front is round and thick, and the back is thin.

The nacelle 3 in the present application is also formed to resemble a tuna body shape. In FIG. 4, the wind that hits the nacelle 3 is compressed by receiving resistance at the front end of the nacelle 3.
The compressed airflow has a high density and flows closely along the peripheral surface of the nacelle 3 so that a water tank flows inside, and on the outside, the compressed high-concentration airflow branches and moves backward at high speed. To flow.

  That is, since the compressed airflow having a higher air density is higher than the rear atmospheric pressure, the airflow flowing at a high speed along the circumferential surface of the nacelle 3 toward the rear at a lower atmospheric pressure is a large diameter portion at the front of the nacelle 3. In order to branch and diffuse from to the surroundings and pass to the back, it is diffused and the air density is reduced, resulting in a negative pressure. Since the rear part of the nacelle 3 is thinner than the front part, the wind flow blown from the front is concentrated and passes at the rear part of the nacelle 3 where the atmospheric pressure is low.

  As a result, the propeller 5 receives airflow at a speed higher than the wind speed hitting the front surface of the nacelle 3 and rotates at high speed. That is, in the same wind speed, due to the shape of the nacelle 3, a high-speed air current is generated on the peripheral surface of the nacelle 3 and hits the propeller. As a result, for example, when a wind having a wind speed of 5 m / s is blowing, a high-speed wind flow can be obtained such that the wind speed hitting the propeller is 6 m / s.

The surrounding wall 8 does not diffuse the airflow passing through the periphery of the nacelle 3 at a high speed outward, but speeds up the airflow by the bulging surface of the inner surface and diffuses it outward and rearward.
The wind that blows from the front of the nacelle 3 presses the front surfaces of the left and right rudder 9 at the rear of the surrounding wall 8 to hold the tip of the nacelle 3 facing upwind.

  When the wind direction changes, the wind pressure on one rudder 9 disappears, and the wind pressure is applied only to the other rudder 9, so that the nacelle 3 turns by being pushed by the wind pressure, and the front end portion is instantaneously directed to the windward. Thus, even if the wind direction changes in response sensitively to the wind direction, the propeller 5 is immediately faced to the wind, so that the wind force can be received without waste.

  FIG. 5 is a front view of the propeller blade, FIG. 6 is a plan view showing the AA cross section, and FIG. 7 is a side view. In FIG. 5, the propeller blade 6 has a front end 6b on the right side and a rear end 6C on the left side in FIG. In FIG. 6, the AA cross section is such that the plate thickness of the front end 6 b is set to be thick within the range of 7% to 15% of the rotation radius, and the end 6 </ b> C after the rotation is set thin so It is formed so as to produce a Coanda effect.

  Further, since the relative flow B is divided before and after the propeller blade 6 and passes at a high speed and generates a negative pressure at the end edge on the rear side of the rotation of the propeller blade 6, the surrounding normal pressure flow gathers and the propeller blade 6 is pushed from the side after the rotation to the direction before the rotation.

  In FIG. 6, the back surface of the propeller blade 6 is set at a right angle to the output shaft 4, and the front surface is inclined from the bulging right side to the left side end. Therefore, the wind flow A blown from the front of the propeller blade 6 strikes the front surface of the propeller blade 6 and flows to the left end, and rotates the propeller blade 6 toward the front rotation end 6b.

  As the propeller blade 6 rotates, the relative flow B that hits the front end 6b of the propeller blade 6 is compressed by the front end 6b and flows to the rear end 6C at high speed by the Coanda effect. As a result, the propeller blade 6 rotates in the rotational direction at the front end 6b. In this case, since a negative pressure is generated on the front surface of the propeller blade 6, a large amount of the wind flow A blowing from the front is called in, and the rotation efficiency is increased.

  In FIG. 7, when the propeller blade 6 rotates, a diffused wind flow C is generated from the blade root portion toward the blade tip by centrifugal force. Further, when the wind flow A blowing from the front hits the inclined portion 6a, the wind speed sliding from the point Q to the P is faster than the wind speed from the point O to the P, and a negative pressure is generated in this region, and the wind flow blowing from the front is increased. Gather together.

  As shown in FIG. 5, since the inclined portion 6a has a larger area on the right side than the area on the left side from the width center line S, a large amount of wind current gathers at the front right tip portion of the propeller blade 6, and the rotational force As the distance increases, the relative flow corresponding to the propeller blades 6 in the rotational direction is quickly passed rearward to reduce the resistance.

  This wind-hydraulic power generator 1 configured as described above creates a high-speed airflow that flows along the circumferential surface of the nacelle 3 by the Coanda effect, with the shape of the nacelle 3 having a large front edge and a large rear edge. I tried to hit the propeller 5.

  In addition to this, the cross section of the propeller blade 6 is formed so that the front end portion 6b is thick so that the Coanda effect can be obtained, so that the high-speed wind passes along the front and rear surfaces of the propeller blade 6 with rotation. As a reaction, the rotation is accelerated by the wind pressure applied from the rear end of the propeller blade 6 to the rear end 6C, and compared with a conventional wind generator having the same propeller blade area due to a synergistic effect. Experimentally, the power generation efficiency was improved 1.5 to 2 times.

FIG. 8 is a side view of the wind-hydraulic power generator showing the second embodiment, and FIG. 9 is a rear view. The same parts as those in the previous example are denoted by the same reference numerals and description thereof is omitted.
The nacelle 3 according to the second embodiment has a tip formed in a semi-spherical shape, and is set to be sharply narrowed backward. The difference between the maximum diameter of the front portion of the nacelle 3 and the diameter of the rear end portion of the nacelle 3 immediately before the propeller 5 is formed to be 5: 1.

  Further, the maximum diameter of the nacelle 3 and the diameter of the propeller 5 are 1 to 1.7, and the diameter of the propeller 5 is set to be small. As a result, the Coanda effect generated on the peripheral surface of the nacelle 3 guides a high-speed flow to the propeller 5, and since the propeller 5 has a small diameter, it is excellent in air flow trapping property by the inclined portion 6a and the rotation efficiency is improved.

  As shown in FIG. 9, the surrounding walls 8 are a pair of left and right, and there is a gap between the upper and lower surfaces facing each other. As a result, there is a difference in the speed of the airflow flowing through the inside and outside of the surrounding wall 8 at both the left and right sides of the surrounding wall 8 plate thickness, and it reacts sensitively to changes in the wind direction and has excellent direction controllability.

  In FIG. 8.9, the surface of the nacelle 3, propeller 5, support arm 7 and surrounding wall 8 that receives fluid from the front is a smooth surface, and the other surface is a rough surface (indicated by a sand point) 1a. As a result, the fluid flowing backward along the circumferential surface increases the cohesiveness by the rough surface and improves the Coanda effect.

  In addition, this wind-hydraulic power generator 1 can be installed in water through a support as appropriate, and can generate power using a water flow. In that case, the wind in the wind flow or the like is read as water or flow. Even in water, the Coanda effect occurs similarly.

  Since this wind-hydraulic power generator 1 has good power generation efficiency even in a weak wind and a weak water flow, the diameter of the propeller 5 can be reduced, and thus a small-sized and high-performance wind-hydraulic power generator 1 can be obtained. It can be used in a wide range of fields such as home use, agricultural use, securing power in remote areas, and so on.

It is a side view of the wind-hydraulic power generator concerning the present invention. It is a front view of the wind-hydraulic power generator concerning the present invention. It is a top view of the wind hydraulic power generator concerning the present invention. It is a top view of the wind hydraulic power generator which shows a wind flow. It is a front view of the propeller blade which concerns on this invention. It is AA sectional drawing in FIG. It is a side view of the propeller blade which concerns on this invention. It is a side view of the wind-hydraulic power generator which shows Example 2. FIG. It is a rear view of FIG.

Explanation of symbols

1. Feng shui generator 1a. Rough surface Strut 3. Nasser 4. Output shaft 5. Propeller 6. Propeller wing 6a. Inclined part 6b. Front end 6c after rotation End 7a after rotation Support arm 8. Enclosure 9. Rudder

Claims (7)

A hydrodynamic power generator with a propeller disposed at the rear of a nacelle that is pivotably disposed on a support, and a high-speed fluid flow that exceeds the flow velocity at the tip of the nacelle caused by the Coanda effect of the fluid that strikes the nacelle Is generated on the peripheral surface of the nacelle and passed to the front surface of the propeller. A wind-hydraulic power generator in which a propeller is disposed at the rear of a nacelle that is pivotably disposed on a support column, the nacelle having a spherical tip, and the maximum diameter of the tip edge is the rear end of the nacelle immediately before the propeller. The fluid that is formed to be twice to five times the diameter of the part and is in contact with the tip of the nacelle causes the Coanda effect to flow at high speed along the circumferential surface of the nacelle to the front surface of the propeller. This is a wind-hydraulic power generator. The wind turbine generator according to any one of claims 1 and 2, wherein the nacelle has a semispherical tip. In the nacelle, a surrounding wall is arranged so as to cover the propeller via a support arm at the rear part, and rudder that is inclined and protrudes outwardly from the left and right rear parts of the surrounding wall is integrally formed. The wind-hydraulic power generator according to any one of claims 1 to 3. The propeller blade of the propeller is formed such that the chord length of the blade tip edge portion is wider than the chord length of the blade root, and an inclined portion inclined forward is formed at the blade tip. The wind-hydraulic power generator according to any one of claims 1 to 4, wherein an area on the right side in the rotation direction is formed wider than the direction of the wind power generator. The wind turbine generator according to any one of claims 1 to 5, wherein a diameter of the propeller is set in a range of 100% to 250% of a maximum diameter of the nacelle. 7. The nacelle, the propeller blade, and the surrounding wall, wherein a front surface portion to which a fluid hits is a smooth surface, and a rear surface surface thereof is a rough surface. Feng hydro power generator.

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