DK201700340A1

DK201700340A1 - Multi layers of rotor blades in horizontal axis wind turbine

Info

Publication number: DK201700340A1
Application number: DKPA201700340A
Authority: DK
Inventors: Barimani Reza
Original assignee: Barimani Reza
Priority date: 2017-06-08
Filing date: 2017-06-08
Publication date: 2019-01-21

Abstract

This study is on a highly efficient horizontal axis wind turbine apparatus for generating energy from wind power. The apparatus includes multi layers of rotor blades and one tapered casing around an axis. Individual performance of the rotor blade layers creates a highly efficient wind turbine. In this case I will show a case of three layer of rotor blades. The first layer of rotor blades is placed outside the casing to rotate the axis and the second layer of rotor blades. The second layer generates wind at high speed in order to increase the rotating velocity of the third layer of rotor blades etc. The power generator connected to the axis of the rotor blades produces electricity by the movement of the blades.

Description

FIELD

Generally, this apparatus relates to energy generation via wind turbines. More specifically, the generation of electricity via horizontal-axis wind turbines.

BACKGROUND

At the present time, the world has become significantly aware of the impacts of global climate change due to the burning and exhaustion of specific fuels, such as fossil fuels. Renewable energy is an alternative solution in resolving global climate change by significantly reducing the use of fossil ftiels. Wind power plays a vital role as a type of green energy which is renewable. Consequently, a majority of the world’s countries, especially developed countries, have launched the enhancement and utilization of wind power generating devices.

Researchers have found that increases in the size of rotor blades can raise energy production. Energy extracted from wind turbines depends on the swept area of the circle

DK 2017 00340 A1 made by the rotor blade or rotor diameter from blade tip to blade tip. In particular, increases in blade length increases the swept area of the circle of the blade that can result in capturing more wind power and thus increasing energy output. For instance, the swept area of the circle of the blade is proportional to the square of the blade length, which means an increase of 5% in rotor blade length results in an improved outcome of 10% energy output. This has motivated commercial companies to produce very large rotor blades with spans of 45 to 50 meters or even greater.

Aerodynamic behaviour and efficiencies of rotor blades are important factors for efficient economic performance of wind generation. Optimal outcome of rotor blade configuration is basically a compromise between strength and shape of the blade. An efficient blade is comparatively narrow along its span and has a twisted shape to improve aerodynamic performance. However, the blade root has to be apparently thick enough to provide sufficient strength to the blade and this feature is against aerodynamic loads. This effect becomes more significant with the increase in rotor blade size. Blade designs are typically more bulbous near the blade root to provide a thickness and strength that compensates for the relatively narrow and lightweight span of the blade.

Previous researchers have advised that long distances be kept between each layer of blades for horizontal wind turbines that utilize multi rotor blades. This has resulted in extremely long lengths of axes. Some other researchers indicated that rotor blades designed in different directions can decrease this negative effect. However, this also reduces the efficiency of the wind turbine.

Fabricating, installing and maintaining very large size rotor blades is very costly. These

DK 2017 00340 A1 costs increased tremendously for offshore wind turbines.

Lucein Romani in patent No 1.007.883 presented a wind turbine with double blade in a main shaft that rotated in opposite directions from each other. Chris Homzee-Jones and GL Garrad Hassan performed a wind turbine with 16 rotor array. Md Maruf Hossain, Mohd Hasan All (US 20140375061 Al) stated a series of wind turbines are connected mechanically by a chain or cable to each other and linked to a single generator. In patent (US 5876181 A), multi-unit rotor blade wind turbine that rotor blades rotate in opposite directions with deference to others was applied.

However, in some cases, multi rotor blade had an impact on the airflow that can be decrease the construction of air on blade and forced to pass through the rotor, more bypasses the rotor disc. Also, some of them presented complicated structures.

In view of this and other shortcomings, it is desirous to provide a system of wind turbines with small size rotor blades that can provide high efficiency energy output. In the present invention, first layer of blade increases and concentrates the wind velocity on the second layer without impact on other blades. It is with this in mind that the present device provides a system of multi rotor blades with individual performance. It is the aim of this device to increase the efficiency of new and existing wind turbines for the economic future.

DK 2017 00340 A1

Summary of invention

This device utilizes multi rotor blades (01,02 and 09) around the main shaft (04) and leads to increase the efficiency wind turbine and decrease the size of rotor blades significantly. It is comprised of three layers of rotor blades (01,02 and 09) in which second (02) and third layer (09) are fixed to the main shaft (07). The first rotor blade layer (01) can be easily rotated around main shaft (07) to push the air to the second layer (02). A wind tunnel (16) around the main shaft (07) is also employed in this device to eliminate the impact of pushing turbulent air in multi directions thus avoiding an increase in the negative effect of drag force. It also avoids catching the wind generated by the spin of neighboring rotor blades and case. It captures fresh wind and directs air from the first layer (01) to the second layer (02) then conducts the wind flow to the outside of the wind tunnel. This procedure increases the lift and decreases the drag on the blades. The tapered wind tunnel (16) and apparatus are connected to the yaw system (18) by a connector.

This device, instead of using multi power generator for each set of rotor blades, employs

DK 2017 00340 A1 just one power generator (15) which significantly reduces the cost of the device. Due to the decrease in size of the rotor blades, the design of the support structure will be much easier. The power generator (15) receives the rotation of the main shaft (07) through high speed shaft (14). The power generator (15) may be installed in the nacelle cover (10).

This device, in contrast to other studies that state the impact of multi rotor blades along a shaft and advocates keeping a long distance to each other, is employed in a novel method to rotate three layouts of rotor blade in order to increase the efficiency of the wind turbine. This device is a high efficiency wind turbine apparatus that may be used in general as a motor, as well as a power generating apparatus. The wind turbine apparatus can turn the wind turbine 360 degrees regardless of wind direction. This device provides a wind turbine apparatus at lower cost and higher efficiency that can work in a variety of locations and surfaces such as offshore and onshore towers. The present invention may also be mounted to utility poles in areas known to be windy, thereby acting as a backup and auxiliary output using the existing grid.

In order to avoid the impact of wide side of the wind tunnel on third layer of the wind blade, long arm can be applied with length greater that diameter of the wind tunnel.

The objectives and advantages of this device are:

This invention aims to present a highly efficient horizontal axis wind turbine apparatus for generating energy from wind power including multi layers of rotor blades in order to address the aspects mentioned above. The objectives of this research can be summarized as follows:

DK 2017 00340 A1

a. To present a wind power apparatus which is relatively simple to manufacture and install.

b. To provide a wind power production apparatus which can be installed on various types of tower and support.

c. To present a wind power apparatus that can capture wind by using two layers of rotor blades without negative effect on each other.

d. To create a wind power apparatus that increases the velocity of wind concentrating on the second layer of rotor blades through the first layer in order to generate power.

e. To produce a wind power apparatus that is easy to transport, maintain and install and only requires a simple foundation design.

BRIEF DESCRIPTION OF DRAWINGS

The present invention will be fully understood from the detailed description given herein below and the accompanying drawings which are given by way of illustration only, and thus are not limitative of the present invention, wherein:

FIG. (1) shows a cross-section of a side view of the present invention.

FIG. (2) shows a front view of the present invention.

FIG. (3) presents a back view of the present invention.

FIG. (4) illustrates a perspective view of the present invention.

DETAILED DESCRIPTION OF THE INVENTION

FIG (1) illustrates the wind turbine from side view. The wind turbine includes a wind tunnel (16) and layers of blades mounted on tower (17). Wind tunnel (16) comprises main

DK 2017 00340 A1 shaft (07) supported by support 1 (05A) and support 2 (05B). Wind enters from wider side (20) of wind tunnel (16) and moved towards the narrow side (19) of wind tunnel (16). Fan blade (01) connected to bearing housing (04A). Bearing housings (04B) and (04C) connected to support (5A) and (5B) respectively. The nose cone (03) installed head of the main shaft (07). Fan blade (01) increases the wind velocity in the wind tunnel (16) and moves towards the turbine blade (02). The third layer of the wind turbine includes long arms (08) and blade (09), and rotates by fresh wind outside of the wind tunnel. Gear wheel (06) fixed to the main shaft (07) and connected to gear box 1 (11) in order to convert horizontal rotation to the vertical rotation. Intermediate shaft (12) connected to i 0 the gear box 2(13) then high speed shaft (14) transferred the rotation to the generator (15) . (11-15) installed in the nacelle cover (10). The wind tunnel (16) and nacelle cover (10) mounted on yaw (18) and tower (17).

FIG. (2) illustrated the front view of the present invention. Wind flow from wider side (20) of the wind tunnel (16) entered and moved towards the fan blade (01). Fan blade (1) 15 increases wind velocity and pushes forward wind flow to the blade (02) in wind tunnel (16).

The nose cone (03) protected the hub casting. The blades (9) captured the wind energy from fresh air outside of the wind tunnel (16). The long arms (08) are applied in order to freely discharge air flow in the tunnel without impact on third layer of blades (9). Wind tunnel (16) mounted on tower (17).

FIG. (03) illustrated the back view of the present invention. This figure shows the long arms (08) and blades (09) in the third layer of blade. Fan blade (01) and, the gear wheel (11) , the intermediate shaft (12), nacelle cover (10), yaw (18) and tower (17) are illustrated in this figure.

DK 2017 00340 A1

FIG. (4) presented a perspective view of the present invention. As illustrated in this figure, first and second layers (01 and 02) of blades are inside of the wind tunnel (16) and third layer of blades (09) with long arms (08) are outside of the wind turbine.

Claims

Claim

1. A system of the wind turbine and rotor blades is comprised of: a wind tunnel (16); a tower (17) that supports the wind turbine; a yaw system (18) that connects to nacelle cover (10); an electric generator (15) that generates electricity by receiving rotating motion from the high speed shaft (14). The first layer of rotor blades (01) has a smaller diameter than the

DK 2017 00340 A1 external wider end (20) of the wind tunnel (16). The first layer of rotor blade (01) moves and rotates by capturing high-velocity wind to produce wind power to turn the second layer of rotor blades (02). The first layer of rotor blade (01) is connected to the bearing housing (04A) and rotates independent of main shaft (07). The second layer of rotor blades (02) is

5 installed after the first layer (01) in the wind tunnel (16) and has same diameter to the first layer (01). Rotation of the second layer of rotor blades, rotated the main shaft (7) and also pushed air horizontally to the third layer of rotor blades (08 and 09). The third layer consists of three arms (08).

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2. The system as in Claim 1, wherein the high-speed air fluid moves towards the first layer of rotor blades (01) through the wind tunnel (16) to the second layer (02) which increases the wind velocity at the second layer (02).
3. The system as in Claim 1, wherein the third layer of rotor blades (09) rotates from fresh 15 wind outside of wind tunnel (16).
4. The system as in Claim 1, wherein the support tower (17) is configured to be vertically mounted and fixed to the yaw system (18). The wind turbine blades (01,02,08 and 09) and main shaft (07) are turned independently depending on the direction of wind in the yaw system (18).
5. 20 The system as in claim 1, wherein the rotation of the main shaft (07) through the multi rotor blades (02, 09) is converted from a horizontal rotation to a vertical rotation. The rotation of main shaft (07) through gear wheel (06) transferred vertical rotation to the gear wheel (11). Then the intermediate shaft (12) transferred the movement to the gear box (13). The gear box (13) with increased speed of rotation, transferred the power through the high speed

25 shaft (14) for running the generator (15).

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6. The system as in claim 1, wherein the generator (15), gear box (13) intermediate shaft (12) and high speed shafts (14) are installed in the nacelle cover (10) cases for easy access and maintenance.
7. The system as in Claim 1, wherein the apparatus can be installed in existing or new support of wind turbine.
8. The system as in Claim 1, wherein the wind turbine system is adapted to be used for various types of supporting columns and locations, such as offshore and onshore.