CFD Online Logo CFD Online URL
Home > Forums > Software User Forums > ANSYS > CFX

Reynolds for a rotary wing/blade

Register Blogs Members List Search Today's Posts Mark Forums Read

LinkBack Thread Tools Search this Thread Display Modes
Old   December 12, 2011, 23:07
Smile Reynolds for a rotary wing/blade
Senior Member
Join Date: Dec 2010
Location: UK
Posts: 245
Rep Power: 16
mohammad is on a distinguished road
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
mohammad is offline   Reply With Quote

Old   December 13, 2011, 16:12
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,771
Rep Power: 143
ghorrocks is just really niceghorrocks is just really niceghorrocks is just really niceghorrocks is just really nice
Your comment about local Re number sounds about right.
ghorrocks is offline   Reply With Quote


reynolds, rotary wing/blade

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
Obtaining Reynolds Number in FLUENT Emmanuel FLUENT 2 April 7, 2016 01:46
New implemented algebraic Reynolds stress model volker OpenFOAM 13 October 21, 2013 00:01
Two way particle coupling in OF 2.0 and the particle reynolds number preichl OpenFOAM 7 February 9, 2012 15:38
Reynolds Stress Models Jade M Main CFD Forum 0 April 21, 2010 16:38
Reynolds Stress Boundary Conditions tstorm FLUENT 0 July 27, 2009 14:44

All times are GMT -4. The time now is 15:07.