Chord length and radius of a wind turbine rotor blade

  • #1
ATY
34
1

Main Question or Discussion Point

Hello,
I have a question about the chord length of rotor blades from wind turbines.
I do not really understand what the difference is to the radius of a wind turbine. I can not find a real explanation, but it seems to be very important. I know that the formula of the chord length depends on many different things (forces, tip speed, number of blades e.t.c.).
I would really appreciate, if somebody could help me.
Have a nice weekend
ATY
Edit: I found a picture of the chord length in a rotor blade, but to me it looks like the radius...
4ff3137b81.png
 
Last edited:

Answers and Replies

  • #2
SteamKing
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Hello,
I have a question about the chord length of rotor blades from wind turbines.
I do not really understand what the difference is to the radius of a wind turbine. I can not find a real explanation, but it seems to be very important. I know that the formula of the chord length depends on many different things (forces, tip speed, number of blades e.t.c.).
I would really appreciate, if somebody could help me.
Have a nice weekend
ATY
Edit: I found a picture of the chord length in a rotor blade, but to me it looks like the radius...
4ff3137b81.png
It's not clear why you think the chord length of the blade is the radius. The picture you are showing is a cut thru one blade, showing the chord length (width) of the blade and its thickness, t. Remember, the blade is essentially a long slender wing which has the shape of an aerofoil in cross-section.

If you take a different view, one which shows the rotor in plan view, then the radius R of the rotor is properly the distance from the center of the hub to the outer tip of the blade.


ABAAABc3wAD-25.jpg

 
  • #3
ATY
34
1
So you mean, that the radius is the whole structure, while the chord length is just the blade thingy itself ? (Sorry, my english is bad, i marked the area of where I think the chord length starts with a red arrow)

54344d4a96.jpg
 
  • #4
SteamKing
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So you mean, that the radius is the whole structure, while the chord length is just the blade thingy itself ? (Sorry, my english is bad, i marked the area of where I think the chord length starts with a red arrow)

54344d4a96.jpg
Yes.
 
  • #5
ATY
34
1
Ah Great, thank you for explaining this to me :)
 
  • #6
SteamKing
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Yes.
To be sure, for the blades shown in the plan view, the chord length of the blade is shorter at the tip than closer in toward the hub. The thickness of the blade is probably also smaller at the tip than closer to the hub.
 
  • #7
CWatters
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