February 25, 2020
Why do wind turbines have three blades?
People have been using the power of wind for thousands of years, its oldest record can be seen 1000 years ago in Persia. But this machine has been developed With simple equipment, enough electricity is used to generate electricity in entire cities to crush the demons to crush grain and to pump water. Traditional wind turbines come in many shapes.
And design, but they all gave way to a fairly consistent 3 blade design. today we
Going to answer the question.
Why do wind turbines have 3 blades?
We can imagine each blade as tightening a nut. If we increase the length of the wrench
We can generate more torque. This is why force causes rotation. Similarly if we
Add another wrench we can apply even more force. The same principle applies to wind turbines. So naturally you might think, why not add as many blades and make them as long as possible. The largest wind turbine has a diameter of
164 meters. Each blade weighs 33 tons and each construction costs hundreds of thousands of dollars. Therefore, more blades equals more weight and more cost to manufacture. So maybe a lower blade is better? Let's compare our standard 3 blade design to our immediate competitors 2 blade turbine
And a 4 blade turbine. Let's say they have the same blade design for now.
We can easily finish the 4 blade design with a quick cost analysis. Each of them
Blades cost a lot of money. Adding a fourth blade gives this kind of marginal growth
Performance is down to 2 and 3 blades if it does not justify the extra cost. The 2 bladed design can match the performance of the 3 bladed design by increasing the blade wire by 50%, eliminating the cost advantage so that it becomes useless. Or we can increase its rotational speed by 22.5%. 2 bladed turbines will spin faster
In the same air, they experience drag because of the drag, but moving fast is a negative. Let's know why. A sharp spinning blade will produce more noise. People don't like to be next to these things, so we have to reduce the noise they make, by reducing their speed.
Next we need to worry about centrifugal forces. As the blades rotate rapidly, their apparent weight increases. Thus the central hub and blade need to be strengthened to resist additional stress, again this adds cost. This can happen when a turbine breaks down
Failing strong winds. So a 3 blade design can generate more power at a slower rotational speed than a two blade design, while being more cost efficient than the four blade option. So the 3 blade design is our Goldilocks choice. Not much no
Very small.
People have been using the power of wind for thousands of years, its oldest record can be seen 1000 years ago in Persia. But this machine has been developed With simple equipment, enough electricity is used to generate electricity in entire cities to crush the demons to crush grain and to pump water. Traditional wind turbines come in many shapes.
And design, but they all gave way to a fairly consistent 3 blade design. today we
Going to answer the question.
Why do wind turbines have 3 blades?
We can imagine each blade as tightening a nut. If we increase the length of the wrench
We can generate more torque. This is why force causes rotation. Similarly if we
Add another wrench we can apply even more force. The same principle applies to wind turbines. So naturally you might think, why not add as many blades and make them as long as possible. The largest wind turbine has a diameter of
164 meters. Each blade weighs 33 tons and each construction costs hundreds of thousands of dollars. Therefore, more blades equals more weight and more cost to manufacture. So maybe a lower blade is better? Let's compare our standard 3 blade design to our immediate competitors 2 blade turbine
And a 4 blade turbine. Let's say they have the same blade design for now.
We can easily finish the 4 blade design with a quick cost analysis. Each of them
Blades cost a lot of money. Adding a fourth blade gives this kind of marginal growth
Performance is down to 2 and 3 blades if it does not justify the extra cost. The 2 bladed design can match the performance of the 3 bladed design by increasing the blade wire by 50%, eliminating the cost advantage so that it becomes useless. Or we can increase its rotational speed by 22.5%. 2 bladed turbines will spin faster
In the same air, they experience drag because of the drag, but moving fast is a negative. Let's know why. A sharp spinning blade will produce more noise. People don't like to be next to these things, so we have to reduce the noise they make, by reducing their speed.
Next we need to worry about centrifugal forces. As the blades rotate rapidly, their apparent weight increases. Thus the central hub and blade need to be strengthened to resist additional stress, again this adds cost. This can happen when a turbine breaks down
Failing strong winds. So a 3 blade design can generate more power at a slower rotational speed than a two blade design, while being more cost efficient than the four blade option. So the 3 blade design is our Goldilocks choice. Not much no
Very small.
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