Wind Turbine Reynolds number calculation verification

  • Thread starter Big_Dawg
  • Start date
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Homework Statement


Hi guys,

I just wanted to verify my calculation of a reynolds number of a wind turbine. I understand that the reynolds number will vary in a spanwise direction along the blade due to changes in the characteristic length(chord width) and velocity(due to the tip speed ratio). As a way to approximate the reynolds number I've taken an average chord length.

V = 5 (free stream velocity)
lamda = 6 (tip speed ratio)
v* = kinematic visocity of air at 10degrees = 1.4207E-5
l = 0.5 (average chord length)


Homework Equations



Re = (V*l)/v*


The Attempt at a Solution



Now this is the part im unsure of. Do I find an average velocity as follows for the calculation:

Vavg = (V*lamda)/2 (Average velocity)

and then calculate as follows:

(Vavg*l)/v* = 527,909

I would appreciate any verification.
 

Answers and Replies

  • #2
SteamKing
Staff Emeritus
Science Advisor
Homework Helper
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Your calculations should always include units.
 

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