Forum
Important Notice for New User Registrations
To combat an increasing number of spam and bot registrations, we now manually approve all new user registrations. While this may cause a delay until your account is approved, this step is essential to ensure the quality and security of this forum.
To help us verify your registration as legitimate, please use a clear name as user name or an official email address (such as a work, university, or similar address). If you’re concerned that we may not recognize your registration as non-spam, feel free to email us at with a request to approve your username.
Blade Design
Hi David
I would like to ask if there is a built-in optimization model about blade shrinkage in Qblade. For example, I want to import a 22MW turbine and shrink it to a blade of only 0.5m size under a certain leaf element ratio.
Thanks.
Hi Roby,
in the blade design module, when editing a blade, the is a “Scale” button that can be used to scale radius, chord and twist.
Otherwise, I would suggest modifying an ASCII .bld file directly and then reimporting it.
BR,
David
Hi David
Thank you for your reply ， i have more question：
I imported an unconventional airfoil by modifying the coordinates of a cylindrical airfoil and performed batch polar processing on it. However, when I attempted polar extrapolation, the following error occurred. Can you explain why this happened and how I can resolve it?
Uploaded files:
- You need to login to have access to uploads.
Hi Roby,
you can oly extrapolate a polar if it contains sufficient data points (at least 10).
In your case, the XFoil analysis did not yield any converged points. This may be due to the geometry of the airfoil. I recommend checking XFoil’s documentation for requirements related to airfoil shape (such as the need for a trailing edge gap, etc.).
If you’re unable to obtain aerodynamic coefficients through XFoil, you might consider importing polar data from other numerical or experimental sources.
BR,
David
