Impact of Blade Tip Bending on Blade Design

Discuss theory and modeling of wind-turbine structures.

Moderator: Bonnie.Jonkman

Arnold.Ramsland
Posts: 17
Joined: Fri Oct 23, 2015 9:27 am
Organization: Ramsland Technology, LLC
Location: North Carolina

Impact of Blade Tip Bending on Blade Design

Postby Arnold.Ramsland » Wed Nov 11, 2020 12:46 pm

Hello,
In an article in Windpower magazine (https://www.windpowerengineering.com/bu ... ine-blade/) the following statement was made:

The first objective of most any large wind turbine blade design project is to get to the lightest weight possible.

One predictable outcome of making the blades lighter will be that they will lose stiffness and show more bending at the blade tip (OoPDefl and IPDefl).
In developing a new blade, is there a guidance regarding an acceptable limit for bending at the blade tip? I realize one important consideration would be to assure that the blades do not strike the tower, however I would appreciate a comment regarding what other factors are important. Also, is there a standard means for measuring OoPDefl and IPDefl (e.g., standard deviation)?
Thanks,
Arnold Ramsland

Jason.Jonkman
Posts: 5778
Joined: Thu Nov 03, 2005 4:38 pm
Location: Boulder, CO
Contact:

Re: Impact of Blade Tip Bending on Blade Design

Postby Jason.Jonkman » Wed Nov 11, 2020 1:43 pm

Dear Arnold,

I agree that avoiding a tower strike is the biggest factor limiting blade deflection. A very large blade deflection could also impact the aerodynamic performance and swept area, but the tower strike limit would likely be far more limiting.

I'm not really sure I understand your last question.

Best regards,
Jason Jonkman, Ph.D.
Senior Engineer | National Wind Technology Center (NWTC)

National Renewable Energy Laboratory (NREL)
15013 Denver West Parkway | Golden, CO 80401
+1 (303) 384 – 7026 | Fax: +1 (303) 384 – 6901
nwtc.nrel.gov

Arnold.Ramsland
Posts: 17
Joined: Fri Oct 23, 2015 9:27 am
Organization: Ramsland Technology, LLC
Location: North Carolina

Re: Impact of Blade Tip Bending on Blade Design

Postby Arnold.Ramsland » Thu Nov 12, 2020 2:01 pm

Thanks,

Arnold


Return to “Structural Analysis”

Who is online

Users browsing this forum: No registered users and 1 guest