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Which Pressure Drop should be used for radial blower?

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Old   October 30, 2016, 05:02
Exclamation Which Pressure Drop should be used for radial blower?
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cwl
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Hello, everyone

I'm performing a steady (with Rotating Reference Frame) simulation of a radial blower with constant density gas.


Impeller:



To get the correct velocity profile at inlet and to avoid backflow problems - i've added a "Stator" region which has two interfaces (Intake and Exhaust) connecting it to the Impeller:




Boundary condition at Inlet is Stagnation Inlet with 0 pressure, boundary condition at Outlet is Pressure Outlet with 0 pressure.
Solution is converging - i obtain mass flow and moment.
Also - i want to know the pressure difference to get the P-V curves.

What is confusing me: i'm plotting two Pressure Drop reports (both are converging) - one between Inlet and Outlet (boundaries of Stator), another - between Intake and Exhaust (interfaces between Impeller and Stator).
And theese two pressure drops are very different.

Can anyone explain me - why there is a difference between them and which one is correct to use for P-V curve?
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