torque calculation to find efficiency of fan
 

Hi,
I have used mrf approach to simulate an axial fan and i want to find the efficiency of this fan. To do so I need 4 parameters (i.e del P, vol flow rate, rpm and torque). Can anyone tell, how I can find torque and which surface i should select to measure this torque value ?

Create a moment report. The input surfaces for the report will be all blade surfaces which participate to the moment. Don't forget the rotating parts of the hub (when applicable).

i saw this in ccm and it is working. Thanks a lot friend !!

7 blades
 

Also ıf ı have seven blades how can ı calculate efficiency?

gozdamar, number of blades is not a parameter for determining fan efficiency.

blades
 

I took only one so that the effıcıency of one blade means all systems efficiency yes?