Fan Component

Jagan Adithya Elango

Hello Experts. I have the P-Q curve of a Axial Fan & I want to determine its flow rate when its placed inside an duct. The static pressure of the duct is unknown. What should be my inlet boundary condition or weather this problem is impossible to solve without knowing one of those? Thank you.

acupro

This tutorial reviews a fan component - for a fan in a duct.

https://2022.help.altair.com/2022.2/hwcfdsolvers/acusolve/topics/tutorials/acu/acu_5101_intro_cfd_r.htm#acu_5100_intro_cfd_r

That uses a volumetric flow rate at the inlet.  In your case, you probably want to use a stagnation/total pressure inflow type.  Then the flow rate and pressure rise will be computed by the solver.

Jagan Adithya Elango

Thanks acupro, I used stagnation pressure as inlet boundary condition. But my pressure rise isn't matching volumetric flowrate. 

The pressure rise is 64.07Pa but the Volumetric Flow rate is only (5.562m/s*0.00383m² or 4.237m/s*0.005024m²) 0.00213m³/h which is lesser than the appropriate value in the performance curve.

Requesting your help in figuring this out.