How to calculate air velocity in a fan and what data should I know ?
So if I have a fan motor, fan blade and a battery, what data should I get from these items ?
I think I will need to know the number of turns per second. How can I determine it ?
You can calculate air velocity as v = f/A where f=volumetric air flow and A = cross-sectional area of the air passage. Also, you have m=p*f, where m=mass flow rate and p=air density. Here 1 it says that "By conservation of energy, the energy consumed in rotating the fan is the same as the energy required to deliver the air: Pfan ∝ υ"