The existing wind power generation will be wiped out and completely destroyed by the typhoon, so the disposal cost as oversized garbage will be much higher within 30 years, so it will be a big loss.
Therefore,
The development of a propeller-less wind turbine " Magnus windmill " is progressing. Instead of flat blades, rotating cylinders catch the wind and are characterized by their ability to generate electricity even in strong winds. It is attracting attention as a renewable energy power source for remote islands that are prone to typhoons.2021/12/13
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https://emira-t.jp/ace/2879/
Convert typhoon power into electricity! Challenge to the strongest wind power generation
Top runner2017.9.13
Convert typhoon power into electricity! Challenge to the strongest wind power generation
Challenergy Co., Ltd. CEO Atsushi Shimizu
Speaking of September, the image of typhoon season comes to mind, but a project is underway to generate electricity using typhoons, which cause natural disasters, as an energy source. We interviewed Mr. Atsushi Shimizu, CEO of Challenergy Co., Ltd., who is challenging this grand plan with his own patented technology.
I want to create a wind power generation suitable for Japan!
Japan is a typhoon-prone country, with more than a dozen typhoons approaching or making landfall each year. It sometimes causes enormous damage to houses and crops, and contains a huge amount of energy.
“It is said that Japan has the potential to become a power generation powerhouse. On the other hand, the wind strength and direction can change easily, making it a difficult environment for propeller-type wind turbines. Therefore, we are aiming to commercialize 'propeller-less wind power generation' that can safely generate power even in typhoons."
Mr. Atsushi Shimizu, CEO of Challenergy, which is working on "typhoon power generation", talks about such an outrageous idea.
Mr. Shimizu, who has won numerous awards and has been adopted in contests for clean energy ideas.
Mr. Shimizu says that there is currently no power generation method that can be used in an environment where a typhoon hits directly.
“With wind power generation, the stronger the wind, the greater the amount of power generated. You may think that a lot of power can be generated with strong winds like a typhoon, but in reality, wind speeds exceeding 25 meters per second can cause runaway wind power generation. It is designed to stop because there is a possibility of damage or damage.
Don't you think it's a shame that we have so much energy nearby and we can't use it? So, the idea of how we could use it for electricity was the impetus for the challenge.”
Originally, Mr. Shimizu was involved in the development of industrial sensors as an engineer at a major electronics manufacturer. Although he was highly conscious of the environment, he was an amateur when it came to renewable energy, not just wind power.
“I started by reading an introductory textbook on renewable energy, and learned about the potential of wind power generation in Japan. The rate is very small, what is the reason?"
It soon became clear why. Japan has many mountains and many undulating topography. Therefore, the direction and strength of the wind are not fixed, and the flow tends to be turbulent. In addition, they are susceptible to harsh conditions such as typhoons and storms. This natural environment was one of the factors that hindered the spread of wind power generation.
“If the wind is relatively stable on the mainland, like in Europe and China, it will be easy to introduce wind power generation. I think it was because of its geographical advantage.Image vyskoczilova / PIXTA
But in Japan that is not the case. Propeller-type wind turbines, which are currently the mainstream, have the drawback of being difficult to respond to changes in wind direction, and there is a risk of damage or runaway in strong winds. In order to popularize wind power generation in Japan, I felt that it was necessary to develop a new wind turbine suitable for the Japanese environment.”
Mr. Shimizu went through about 5,000 patents related to wind power generation, and the only answer he arrived at was the "Magnus effect."
Familiar but little known potential of the Magnus Effect
Simply put, the Magnus effect is a phenomenon in which when a rotating cylinder or sphere is placed in a flow of air (wind), a force (lift) is generated perpendicular to the direction of the flow.
For example, in ball games such as baseball, table tennis, and soccer, when a ball is spun when released, it bends or floats, and this is due to the Magnus effect. When a rotating cylinder or sphere is placed in the presence of wind, the Magnus force acts perpendicular to the direction of the wind. Furthermore, it is possible to control the Magnus force by changing the rotation speed of the cylinder.
Image provided by: Challenergy Co., Ltd.
Attempts to use this force for mechanical power have actually been made for a long time. In the 1920s, it is said that the development of an airplane with cylinders on the sides of the fuselage instead of wings and flying by the Magnus effect was underway.
"The magnitude of the Magnus force can be easily adjusted by changing the number of rotations of the cylinder. When the rotation is stopped, it becomes zero, and when the number of rotations is increased, a force greater than that of a fixed wing can be obtained. In the first place, if the rotation of the cylinder stops for some reason, the Magnus force will become zero and it will crash, so currently the Magnus force is not used. I don't have a plane to use."
The vertical axis type Magnus wind power generator drives a cylinder with a motor to generate Magnus force. By adjusting the rotation speed of the cylinder even under strong winds, the windmill can continue to generate electricity without going out of control.
In the event of an emergency, stopping the rotation of the cylinder would reduce the Magnus force to zero, and it would be possible to reliably stop operation without using a brake or the like. This is the merit of using Magnus power for wind power generation as Mr. Shimizu said.
Mr. Shimizu decided to utilize the Magnus effect in a new mechanism of wind power generation, and the "vertical axis Magnus wind power generator" was born after trial and error.
“Well, in order to adapt to the environment in Japan, it is necessary to be less affected by the direction of the wind. Yes, but it may not be able to follow changes in the direction of the wind.Therefore, a vertical axis windmill is used.The vertical axis windmill has no direction, so it is not affected by changes in the wind direction.
In addition, since the entire wind turbine rotates slowly, the vertical axis Magnus wind turbine makes little noise and is less likely to cause accidents such as bird strikes in which birds are caught in the machinery.” EPIA Advanced Technology Center (Port of Tokyo) Prototype of vertical axis Magnus wind power generator on display at 2-8-44 Kita-Aoyama, Tokyo
However, this method had a fatal problem.
“The direction of the Magnus force is determined by the direction of the wind and the direction of rotation of the cylinder. If you simply attach multiple cylinders to a windmill and rotate them clockwise to generate electricity through the rotation of the entire windmill, you will find that when the cylinder is on the windward side, The generated Magnus force is in the direction of turning the windmill clockwise.Even if the windmill rotates and the cylinder moves downwind, the direction of the Magnus force remains the same, so this time it turns the windmill counterclockwise. This will cancel out the rotation of the windmill.”
In fact, this is the reason why vertical-axis Magnus wind turbines have not been put to practical use so far. Patents have been filed all over the world to overcome this problem, but none have been put into practical use.
"This characteristic cannot be changed only by the laws of physics. The common problem of researchers trying to use Magnus force for power generation is how to prevent the occurrence of Magnus force when the cylinder turns downwind. I thought that I had solved this problem by combining two cylinders into one pair.”
Shimizu invented a method in which two cylinders rotating in opposite directions are installed as a pair, and the cylinders exposed to the wind always rotate in the same direction (the cylinder on the leeward side is hidden behind the cylinder on the windward side).
"However, when I ran a computer simulation, I found that the power generation efficiency was hopelessly low." Conceptual diagram of the initial vertical axis Magnus wind turbine
Image provided by: Challenergy Co., Ltd.
Discover innovative ideas by accident!
“We had to return to a blank slate and rethink the system from the ground up.”
Mr. Shimizu, who says so, has devised such things as changing the surface shape of the cylinder. Although power generation efficiency improved, it was still far from practical use. In order to reach the same level as general propeller-type wind turbines, a breakthrough was needed to further increase efficiency.
But here a miracle happens.
During an experiment to measure the Magnus force, he noticed that the torque changed under certain conditions.
A change that Mr. Shimizu himself did not anticipate at all. We immediately modified the tester on the spot and measured again, and we were able to confirm that it was indeed effective.
"When we ran simulations again based on new ideas, we found that the efficiency of power generation could be increased to about 30%. This is a performance that can even compete with propeller-type wind turbines. " type magnus windmill
Image provided by: Challenergy Co., Ltd.
And Challenergy's typhoon power generation project is moving forward with research and development of wind turbines, while moving to demonstration experiments. In 2016, we installed a field test machine with a rated output of 1 kW in Nanjo City, Okinawa Prefecture, and are testing changes in power generation and durability.
Vertical-axis Magnus wind turbine in trial operation at the Okinawa Proving Ground in Nanjo City, Okinawa Prefecture
“We chose Okinawa to test performance under direct typhoon hits. When a typhoon hits, we will test whether it will be able to generate electricity properly, and at the same time, we will also test whether it can be stopped reliably if necessary.”
The Magnus windmill, which until now could only be tested through wind tunnel experiments and simulations, will actually operate outdoors. For Mr. Shimizu, who has been passionate about developing the world's first, it must have been an irreplaceable joy. Challenergy's 1kW field test machine installed in Nanjo City, Okinawa Prefecture. Confirmed stable operation and safe shutdown under wind speed of around 25m/s when a typhoon is approaching
Image provided by: Challenergy Co., Ltd.
His ambition is to go to a typhoon and generate electricity on the spot.
At present, Challenergy is developing a mass-produced machine with a rated output of 10 kW, which can obtain a higher output, in parallel with the operation test in Okinawa, and aims to commercialize a large machine with a rated output of 100 kW or more in the future. there is
If commercialized, this large-scale wind power generator will be able to replace existing generators. Will it become popular in the future?
“The vertical axis Magnus wind turbine is a wind power generation system that can generate power not only in typhoons but in any environment. We can expect it to spread in countries where awareness is high.”
Among them, Mr. Shimizu is most interested in the Philippines.
“Like Japan, the Philippines is hit by a number of typhoons each year. Many of the small islands that are scattered around rely on small diesel generators to generate most of their electricity, but transporting fuel is also difficult. However, we believe that wind power generation will be able to provide clean and sufficient power to these islands,” says Mr. Shimizu, speaking about future prospects. As the expression suggests, the future of the vertical axis Magnus wind turbine is bright even from a global perspective.
He also mentioned further possibilities.
“In the future, tankers will be equipped with a large vertical-axis Magnus wind power generator, which will go to the vicinity of the typhoon to generate electricity. It might be possible
This can be called “typhoon power generation”.
The “infinite possibilities of Magnus power” that Mr. Shimizu is excited about are now starting to take shape little by little. An innovative challenge to convert the enormous energy of the earth into electric power has begun.
Atsushi Shimizu ●After completing the master's course at the University of Tokyo, engaged in research and development of FA equipment at a major electronics manufacturer. Meanwhile, he single-handedly invented the "Vertical Axis Magnus Wind Turbine". In October 2014, he founded Challenergy Co., Ltd. and assumed the position of CEO. The original idea that can generate electricity even in a typhoon won the 1st Tech Plan Grand Prix (March 2014) Grand Prix, TOKYO STARTUP GATEWAY 2014 (November 2014) finalist, NEDO (National Research and Development Agency New Energy and Industrial Technology) Development Organization) Has been awarded in numerous contests such as "R&D Venture in the Seed Stage" and "Startup Innovator", and has been adopted as a subsidy program. https://challenergy.com/
Doubt common sense! Spain-born bladeless wind power generator to start selling in 2020
Topics
2019.6.21
Doubt common sense! Spain-born bladeless wind power generator to start selling in 2020
What is a new type of wind power generation mechanism born from a reversal idea?
The world's first wind power generator was built about 130 years ago. Furthermore, there are records that windmills have been used for pumping water and irrigation since pre-Christian times. For more than 2,000 years, it has been common knowledge that obtaining the power of the wind = turning the propeller. However, Spanish start-up company Vortex Bladeless developed a wind turbine without blades. Introducing a rare invention and its mechanism that overturned common sense.
Current state of wind power generation as seen from the global renewable energy situation
The term “renewable energy” has become more popular than it used to be. Specific examples include hydropower, geothermal power, and solar power, but which one came to mind first?
In fact, the answer varies depending on the country or region where you ask.
According to a survey by the Agency for Natural Resources and Energy, hydroelectric power generation is the most supplied renewable energy source in Japan, Canada, and China. On the other hand, Germany, Spain, and the United Kingdom have data on wind power generation.
A diagram showing various percentages of power generation in countries around the world. With the exception of Canada's hydropower, Europe turns out to be a leader in renewable energy
Source: Agency for Natural Resources and Energy
In 2009, renewable energy was clearly defined in Japan.
A law called the Energy Supply Structure Sophistication Act aims to promote the use of renewable energy that does not rely on fossil fuels.
However, even now, after 10 years, it is hard to say that environmental improvements have progressed compared to developed countries. According to the above data, renewable energy accounts for about 16% of Japan's total power generation. Even hydroelectric power, which has the largest share, accounts for only 8%.
On the other hand, in Europe, which is called a renewable energy advanced country, Germany, Spain and Italy exceed 30%. One of the most noteworthy is Spain's wind power generation.
Spain boasts the world's fifth largest wind power generation capacity (total power generation in 2018: 23,484 MW) after China, the United States, Germany, and India. is actually about 18%. This is the highest share in the world.
In such a wind power generation superpower Spain, wind power generators with new ideas are currently being developed.
That is a bladeless wind turbine made by wind energy startup Vortex Bladeless.
Mr. David Yanes, one of the founders, and a prototype of a wind turbine made by Vortex
There are two types of conventional wind power generators: horizontal axis wind turbines that rotate vertically with respect to the ground, and vertical axis wind turbines that rotate horizontally parallel to the ground. Mainly commercialized are horizontal axis wind turbines, which generally have three propellers similar to the blades of an airplane. A propeller is built into the power source, and a turbine is turned to generate energy. Many people in Japan may have seen it.
On the other hand, Vortex Tacoma, a wind power generator under development by Vortex, has a cylindrical shape that looks like a small rocket and is about 2.7 meters high. It uses carbon fiber and glass reinforced fiber (FRP) materials to maintain lightness and strength, and is divided into a vibrating upper part and a ground-fixed lower part. When commercialized, it is expected to weigh about 15kg and generate 100W/h.
Inside the cylinder is a patented generator that uses coils and magnets, and the upper part vibrates left and right to generate energy.
A Vortex Tacoma prototype generating electricity. Only the upper part of the cylinder sways, the lower part is firmly fixed to the ground
What was the unexpected trigger behind the development of the new technology?
A phenomenon called vortex-excited vibration, which creates stable vibration, is important for high-efficiency power generation.
Vortex-induced vibration is a phenomenon in which resonance occurs and the amplitude increases when the natural frequency of each object matches the frequency of the air vortex generated by the wind hitting a cylinder or other material. Originally treated as a nuisance when building buildings, it became widely known in 1940 when the Tacoma Narrows Bridge in the United States collapsed due to this phenomenon.
The idea for a bladeless wind turbine actually came about when one of the developers saw a video of this bridge. It was a reverse idea: ``If there is enough energy to destroy a bridge, it can be controlled and used to generate electricity.''
Video of the Tacoma Narrows bridge collapse. The part that collapses starts around 3:04
This is how the vortex-induced vibration is captured. You can clearly see that the wind that hits the cylinder on the left forms a vortex when it escapes.
However, it is not easy to induce vortex-induced vibration. Since the frequency of air vortices is not constant, it was necessary to change the frequency of the wind turbine to match the vortices. Vortex Bladeless has developed a unique tuning system that automatically adjusts the frequency of the generator. As a result, we created a mechanism that causes resonance even at wind speeds of 3 m and can start and maintain power generation.
Because of its lightness and ease of installation, Vortex Tacoma is expected to be installed on the roof of your home or in your garden. The price is scheduled to be around 200 euros per unit (approximately 24,300 yen in Japanese yen, calculated at 121 yen to 1 euro as of June 21), and we are aiming for sales in 2020.
In the future, the company plans to develop even larger 1MW class wind power generators. Even if the size is increased, manufacturing costs can be cut by more than 50% and maintenance costs by more than 80% compared to conventional wind power generators.
This is because it does not use complicated parts like before. Since there is no need to use oil for maintenance, the cost of disposal can be reduced.
Vortex's wind power generator solves the problems of propeller noise, bird entanglement, and enormous costs that conventional wind power generators have had. A new technology born in Spain, an advanced country of renewable energy, may completely change the situation of wind power generation in the world.
vyskoczilova / PIXTA
When a rotating cylinder or sphere is placed in the presence of wind, the Magnus force acts perpendicular to the direction of the wind. Furthermore, it is possible to control the Magnus force by changing the rotation speed of the cylinder.
EPIA Advanced Technology Center (Port of Tokyo) Prototype of vertical axis Magnus wind power generator on display at 2-8-44 Kita-Aoyama, Tokyo
Conceptual diagram of the initial vertical axis Magnus wind turbine
" type magnus windmill
Challenergy's 1kW field test machine installed in Nanjo City, Okinawa Prefecture. Confirmed stable operation and safe shutdown under wind speed of around 25m/s when a typhoon is approaching
says Mr. Shimizu, speaking about future prospects. As the expression suggests, the future of the vertical axis Magnus wind turbine is bright even from a global perspective.
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