I'm building a ducted fan and I would like it to:
- have a uniform airflow at the output
- have good static pressure
- have a square section output (see figure: air enters the circular edge and exits from the square edge)
In my application the output section will be covered by a breathable membrane.
While doing some tests I noticed that the airflow in the center was much weaker than at the sides, with this blade design (counter-clockwise rotation):
How can I get more uniform airflow?
Here are some thoughts on how to improve the design, but since I don't know virtually anything about fan design and fluid dynamics I'm asking more competent folks here to judge whether these ideas could work:
- adding more blades
- make the blades flatter
- make the blades wider
- reducing the radius of the mounting cyclinder of the blades
- make the output section smaller than the input section
Do you know if any of these would work? Do you have better suggestions?