POOR EFFICIENCY FAN

[Jinder]

I have an axial fan rig that has a new rotor and stator design. I have tested it and the efficiency of the new rotor is only about 30% max when it should be about 80%

My question is, what are the reasons for poor efficiency, why is the new rotor not very good? I t is run at 2000rpm.

Could some-one please also put me into the right direction to where I could learn some basics on Turbomachinery (only Axial fans) and Velocity Triangles and how these are used to look at the performance of a fan. All the neccessary detail around them. Good detail on pressure differences, and how this works etc.

Thanks

 

[insideman]

Details, please!

Flow, head, rpm, blade inlet angle Vs.radius, blade outlet angle Vs. radius, blade width Vs. radius, number of blades, outside diameter, shroud clearance, hub diameter, inlet bell?, spinner?, number of straightening vanes, width of vanes Vs. radius, vane inlet angle Vs. radius.

Then we are in a position to evaluate your fan.