Inverse design of a blade!

[Tariq Khamlaj]

Hello Wind People,

Greetings All! This my first post through this forum. I am trying to inverse a design of a blade that I have its power curve. The power curve is given in terms of power coefficient vs. tip speed. The only information given about this turbine besides the power curve is hub and tip radius and airfoils from hub to tip. I would like to inverse this blade to match its power curve. I have tried different software but I am not really expert designer. I was wondering if someone has any experience inversing blades to help me get this blade.

Thanks in advance,

[Rob Beckers]

Tariq, welcome to the forum!

You'll have to describe what you mean by"inversing blades", because I have no idea what you're looking for.

Beyond that, it would be helpful to understand what you are ultimately trying to do.

-RoB-

[Tariq Khamlaj]

Hi Rob,

Thank you for your reply. I am doing my research study on shrouded wind turbines (HA). I am trying to validate to one of those paper published online. However, all papers that I have found didn't provide the blade details. In one of the papers, the power curve as well as a picture of the blade were provided as below.

1248

1249

Furthermore, the blade has a hub and tip diameters of 0.588 m and 0.132 m respectively. The airfoils that they used are NACA 63-218, NACA 63-215, and NACA 63-212 from hub to tip. I have tried different designs to try to revers it to match the power curve but no luck so far:cry:. I was wondering if there is any way to reveres this blade to continue my research. I hope that my post is more clear now!

Thanks in advance,

[Rob Beckers]

So you just need to know the details of the NACA profiles? I probably can help with those. Somewhere I have a book with all the regular NACA profiles in detail.

I have a little trouble interpreting that Cf vs. Lambda curve. Reasonable TSR values for peak power would be at higher values for those blades, more around 5 - 7, unless they're running them at a very steep pitch vs. the hub.

-RoB-

[Tariq Khamlaj]

Dear Rob,
Thank you again for the quick response. I have all details (coordinates + Lift and drag vs alpha) for these airfoils NACA 63-218, 215, 212. All details are attached. The issue as you mentioned the maximum power coefficient occurs at a very low tip speed. I tried to redesign it (reverse) using these information, but I am still unable to match the power curve mentioned earlier. How would you redesign it based on the following information?

Lift vs angle of attack data;
1255

Drag vs angle of attack data;
1256

Data extended from -20 to 20 to -180 to 180 using Vetrena Extrapolation;
1257

Power curve;
1249

Blade shape;
1248

Hub diameter;
0.132 m

Tip diameter;
0.588 m

The blade should have the airfoils;
NACA 63-218, 215, 212 from hub to tip.

Kind regards,

[Alton Root]

hello,
i want to install "Ginlong GCI-5K-W" for my inventor, is their much better for?