はじめに，前回入手したPCの開発環境を整えた．
Windows10でも意外と使用する全ソフトが利用できた．
ただし，何となくわかっていたが，コンパイラやPython周りがやや面倒だった．ソフトのバージョンが違うとか32bitから64bitのOSに変更したとか云々．
あとは何となく３DCADでファン設計．ツールはAutodesk Fusion360．2DのAutoCADは使っているので同じ会社の無料ソフトを選択．
2Dのソフトと完全に同じ感覚で操作できるわけではないようだが，半日程度でそれっぽい形のファンが描けた．
how did you ended up decide the shape of your fan blades?
返信削除I have no idea. I just mimicked Mr. Utsunomiya's design.
返信削除http://blog-imgs-88-origin.fc2.com/h/i/d/hidejrlab/SDN7.jpg
What I can say is:
1 Smalller attack angle makes smaller air resistance. It makes the speed of fan higher. Stronger suction force is acheved.
2 However, if the sweep area is same, lower attack angle needs longer blade. So the fan gets heavier and more torque is needed.
3 On the other hand, lower attack angle makes air resistance smaller, so thinner blade can be used. It leads lower fan weight.
So I think it is very difficult to decide the best shape of fan. May be try and error is best way to decide.