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compressor simulate output area condition setting

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Old   June 30, 2014, 23:27
Default compressor simulate output area condition setting
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Hi everybody

I want to simulate a compressor performance
I know the input pressure and the compressor rotating speed
but i don't know the output pressure or speed

how should I set the output area condition?
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Old   July 2, 2014, 22:25
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Well, the pump should have a curve, so the flow will be dependent on the delta P. Whatever you model will give you one point on that curve.
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Old   July 9, 2014, 03:06
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You can define opening on the outlet
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Old   July 9, 2014, 05:30
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If you are referring to something already tested then you should have a characteristic curve of that compressor, as evcelica said.
If this is a new design component and you want to know how good it is, than you can proceed like this:
- fix a mass flow rate at your outlet (maybe the design mass flow rate to start)
- proceed with your sim with your actual working conditions (speed, inlet pressure), again in design condition to start
- when you get the results you have to measure the pressure difference between outlet and inlet of your model. This way you have a "point" on the characteristic compressor working diagram (pressure ratio, mass flow, speed).
- Change the mass flow and repeat everything as long as you want (this point can be inverted with the next one)
- change the speed and repeat everything as long as you want you can see, obtaining a compressor map from CFD simulations is a looooooong process
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