torque calculation to find efficiency of fan

bhanu1810 · September 29, 2011, 14:13

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 ?

abdul099 · October 1, 2011, 19:12

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).

bhanu1810 · October 2, 2011, 04:10

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

gozdamar · September 1, 2015, 09:59

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

fluid23 · September 1, 2015, 13:01

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

gozdamar · September 2, 2015, 04:58

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

September 29, 2011, 14:13	torque calculation to find efficiency of fan	#1
bhanu1810 New Member Join Date: May 2011 Posts: 6 Rep Power: 15	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 ? Anandltvs likes this.

October 1, 2011, 19:12		#2
abdul099 Senior Member Join Date: Oct 2009 Location: Germany Posts: 636 Rep Power: 22	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). sdmfv110 and Anandltvs like this.

September 1, 2015, 09:59	7 blades	#4
gozdamar New Member gokhan ozdamar Join Date: Sep 2015 Posts: 4 Rep Power: 11	Also ıf ı have seven blades how can ı calculate efficiency?

September 2, 2015, 04:58	blades	#6
gozdamar New Member gokhan ozdamar Join Date: Sep 2015 Posts: 4 Rep Power: 11	I took only one so that the effıcıency of one blade means all systems efficiency yes?

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October 2, 2011, 04:10		#3
bhanu1810 New Member Join Date: May 2011 Posts: 6 Rep Power: 15	i saw this in ccm and it is working. Thanks a lot friend !!

September 1, 2015, 13:01		#5
fluid23 Senior Member Matt Join Date: Aug 2014 Posts: 947 Rep Power: 18	gozdamar, number of blades is not a parameter for determining fan efficiency.