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#1 |
Senior Member
mohammad
Join Date: Dec 2010
Location: UK
Posts: 246
Rep Power: 17 ![]() |
Hi dear All,
I want to know that when we are working with a wind turbine with a very long blade, for "Lift coefficient_ AOA" calculation which Reynolds number must be worked with. I am thinking because in different radial positiions the velocity is changing according to the "Local R". For example: -Please consider the chorld length is constant; -Velocity of wind is 10 m/s , and think R= 5 m , =7.5 Rad/s So, the Relative Velocity at the tip = [ (10)^2+(5*7.5)^2 ]^ 0.5 ~ 39 m/s and then the Reynolds at the TIP will be 4 times the Reynold of free stream. Now when we want to check the values of Cl-AOA , which Reynolds number we must consider? I think I must work with local Re and for different radial positions I must calculate Re number and work with that local Re. Would you please tell me the answer for this question |
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#2 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,901
Rep Power: 144 ![]() ![]() ![]() ![]() |
Your comment about local Re number sounds about right.
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Tags |
reynolds, rotary wing/blade |
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