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Homework Help: Wind Turbine Reynolds number calculation verification

  1. Aug 23, 2014 #1
    1. The problem statement, all variables and given/known data
    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)

    2. Relevant equations

    Re = (V*l)/v*

    3. 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.
  2. jcsd
  3. Aug 23, 2014 #2


    User Avatar
    Staff Emeritus
    Science Advisor
    Homework Helper

    Your calculations should always include units.
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