Airfoil-Automotive radiator fans design
 

Hi everyone,

I am new to axial fan design. At present i am dealing a fan project. In that i have to optimize the existing fan design for better air flow performance.The constraints are hub,fan diameters and speed shouldn't be disturbed.But i am allowed to make any changes in blades profile. For this case, i have decided to analyse the existing airfoil used in blade and replace it with the one that produces better air flow performance(Any other idea is welcome). 1.To choose better airfoil what should i do ? 2.What are the relationships that exist between lift,drag coefficient and air flow performance? 3.How do i find lift and drag coefficient of airfoil?
Any help/suggestion are welcome. Thanks for your word/time.