|September 23, 2008, 04:32||
plotting a performance curve of centrifugal Fan
Dear Friends; I need you help, please
I just want to simulate and plot the performance curve of single inlet centrifugal fan with spiral casing by CFX5 to compare with real test values. I have real test values/curves with volumetric flow rate vs total pressure, x axis also contains dynamic pressure losses.
- meshes are generated by cfx mesh for both volute and full blade domains.
-analsys type: steady state
-fluid: air ideal gas
-frozen rotor interface model choosen for interface between rotor and volute "pitch change: none" selected.
-from the expert parameters "ggi permit no intersection: t" selected
- for the inlet(volute) and outlet(volute) boundary condition, opening /(static pressure entrain)selected.(for the first run; 0 Pa relative pressure selected for both outlet and inlet to see max air flow)
I hope these BCs and aproaches are suitable for this simulation.
my problems are; - what should I do for the define another points on the performance curve.For example; Can the raising relative static pressure entrain to 100pa at the outlet give me the point of (100Pa,x [m^3/s]) on the curve?
- another problem is; I calculate different volume flow rates if I calculate from (massflow rate / density @outlet) or Areaint(velocity)@outlet , flow rates also seen different at outlet and inlet according to velocity.
-finaly which equations should I use to reveal dynamic pressure loss between volute inlet and outlet for the certain run (0Pa static entrain pressure @inlet and outlet).. And for the calculating fluid power?
Thanks for any kind of help. Altano
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