# Axial Flow Fan

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 December 20, 2010, 00:35 Axial Flow Fan #1 New Member   SCORPION Join Date: Dec 2010 Location: Pakistan Posts: 5 Rep Power: 7 I wonder if there is a mathematical formula to calculate the flow rate of a fan if following parameter are known Fan effective diameters Blade Angle ( Pitch ) Number of Blades Speed ( RPM ) Power Consumption Pressure at inlet of the fan Regards

 December 20, 2010, 02:31 #2 Senior Member   Hamid Zoka Join Date: Nov 2009 Posts: 199 Rep Power: 10 there are some empirical ralations for such this calculations. but they are limited to some specific geometries and their application is limited. regards

 December 20, 2010, 02:38 #3 New Member   SCORPION Join Date: Dec 2010 Location: Pakistan Posts: 5 Rep Power: 7 i have measured the basic dimension and geometrical equation of the fan that i am going got measure the flow rate of. but i don't know the relations. :-(

 December 20, 2010, 02:39 #4 New Member   SCORPION Join Date: Dec 2010 Location: Pakistan Posts: 5 Rep Power: 7 why are you saying that its application is limited?

 December 20, 2010, 03:01 #5 Senior Member   Hamid Zoka Join Date: Nov 2009 Posts: 199 Rep Power: 10 there are some coefficients for these relations which are function of blade geometry as well as type of the flow. they are usually available just for some limited fan blade shapes and flow types. regards

 December 20, 2010, 07:07 #6 New Member   SCORPION Join Date: Dec 2010 Location: Pakistan Posts: 5 Rep Power: 7 Oh i c...!!

 May 26, 2011, 04:05 uss #7 New Member   Urmil Shah Join Date: May 2011 Posts: 1 Rep Power: 0 hey, I am working on the design of a low pressure axial flow fan. I have generated the aerofoil sections at 5 different radii of the fan along with their stagger angles. What I am struggling with is how they are to be oriented with respect to each other in the axial direction. For a aerofoil at a given radii, I have found its its stagger angle. But, I could still translate it along the circumference (i.e. sweep) and along the axis of the fan. I am unable to decide how to move the sections along the axial direction, before I pass a best fit surface through them to generate a fan blade. Also does anyone have any idea on how to decide on sweep angle ?

May 26, 2011, 08:42
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 Originally Posted by urmilshah hey, I am working on the design of a low pressure axial flow fan. I have generated the aerofoil sections at 5 different radii of the fan along with their stagger angles. What I am struggling with is how they are to be oriented with respect to each other in the axial direction. For a aerofoil at a given radii, I have found its its stagger angle. But, I could still translate it along the circumference (i.e. sweep) and along the axis of the fan. I am unable to decide how to move the sections along the axial direction, before I pass a best fit surface through them to generate a fan blade. Also does anyone have any idea on how to decide on sweep angle ?
what softwares u r using??