# I want to predict the performance of the axial flow fan.

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 April 14, 2013, 22:33 I want to predict the performance of the axial flow fan. #1 New Member   Korean Pie Join Date: Nov 2012 Posts: 6 Rep Power: 6 Sponsored Links I speak English a little. Fan Specifications condition Volume Flow rate : 36.8[m^3/s] Total Pressure : 539[Pa] = 55[mmAq] Static Prssure : 0[pa] = 0[mmAq] Used motor : 50Hp = 37kw RPM : 1760 rpm 1. What conditions are optimized conditions? ex) Inlet : no.1 Outlet : No.4 2. I want to see the Total Pressure & Static Pressure efficiency. ex) A. Pt[pa] =Outlet Lid Pt(SG av) - Inlet Lid Pt(SG av) B. Ps[Pa]= Outlet Lid Ps(SG av) - Inlet Lid Pt(SG av) ↑↑↑↑ What is the exact official this? C. Volume Flow[m^3/s] = Inlet Lid (SG av) Volume Flow D. W = Impeller Torque * Rotating region E. (C * A or B) / ( D ) = Efficiency? It is really important to me.? Thank you. Thank you. Last edited by Sanghyun - PARK; April 16, 2013 at 19:32.

 April 30, 2013, 04:31 #2 Senior Member   Boris Marovic Join Date: Jul 2009 Posts: 494 Rep Power: 16 Hi Sanghyun, It is not 100% clear to me what your problem is but I will try to help you. 1. The ideal boundary conditions for fan simulations are inlet volume/mass flow and outlet pressure. There is an example in the tutorials on an impeller. This model is a radial fan but the basic setup is the same. You can find it on page C5-1. 2. You can also find the right formula for this calculation in the tutorial (page C5-5) Efficiency = (volume flow rate [m^3/s] * (Ps_outlet [Pa] - Ps_inlet [Pa]))/(torque [Nm] * rotating speed [rad/s]) I hope this helps, Boris

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