Savonius Wind Turbine: Power Output & Lever Arm Effects

In summary, the conversation discusses the potential improvements that could be made to a Savonius Wind Turbine by moving the "scoops" further apart and increasing the radius. It is believed that this would increase torque and reduce the rotation per minute, potentially making it start at a lower wind speed. The speaker plans to build and experiment with this idea.
  • #1
dlbeeson
17
0
Given a certain sized Savonius Wind Turbine, for example, using a 5 gallon bucket (about 12 inches in diameter and 14 inches tall) cut vertically in half, the standard configuration has the two "scoops" either touching at the central vertical axis, or partially overlapped.

Would moving both "scoops" out horizontally, away from the axis, for example, with the center of each scoop mounted at the end of a 4 foot bar, with the main vertical axis in the center of the bar, 2 feet from each bucket, improve either the power output at a given wind speed, or the sensitivity to start rotation in slower winds?

In general, what might be gained or lost in separating the scoops (bucket halves) more, increasing the radius, and hence the lever arm?
 
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  • #2
I believe separating the scoops would increase torque and reduce rpm. Probably make it start at a lower wind speed.
 
  • #3
CWatters said:
I believe separating the scoops would increase torque and reduce rpm. Probably make it start at a lower wind speed.
Thank you CWatters. That is what I was thinking. Will build and experiment.
 

1. What is a Savonius Wind Turbine?

A Savonius Wind Turbine is a type of vertical axis wind turbine (VAWT) that uses curved blades to capture wind energy and convert it into rotational motion, which can then be used to generate electricity.

2. How does the power output of a Savonius Wind Turbine compare to other types of wind turbines?

The power output of a Savonius Wind Turbine is relatively low compared to other types of wind turbines, such as horizontal axis wind turbines. This is because the curved blades of a Savonius turbine are not as efficient at capturing wind energy.

3. What factors affect the power output of a Savonius Wind Turbine?

The power output of a Savonius Wind Turbine is primarily affected by the wind speed and the size of the turbine. Higher wind speeds will result in higher power output, while a larger turbine will be able to capture more wind energy.

4. What is the lever arm effect and how does it impact the performance of a Savonius Wind Turbine?

The lever arm effect refers to the distance between the center of rotation of the turbine and the point where the force of the wind is applied. A longer lever arm can increase the torque on the turbine, resulting in higher power output. However, if the lever arm is too long, it can also create more drag and decrease the efficiency of the turbine.

5. What are the advantages and disadvantages of using a Savonius Wind Turbine?

One advantage of a Savonius Wind Turbine is its simplicity and low cost compared to other types of wind turbines. It also has the ability to operate in low wind speeds and from any direction. However, its low power output and efficiency make it less suitable for large-scale energy production. Additionally, the curved blades can be more prone to damage and require more maintenance.

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