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Originally Posted by nissanfanatic
But when the pump stalls, it isn't flowing anything. When it "stalls" on a centrifugal, the air just backs up in the housing while the impeller spins. Pressure+no flow=no more power. Flow+no pressure=no power. Exactly the same as the HP vs Torque arguement.
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I think the point that
gmatov is trying to make is that the total pressure created by the fan is sum of the dynamic and static pressures. So when the flow is restricted to the point that it stops, the dynamic pressure will go to zero and the total pressure will equal the static pressure (and be non-zero).
Below is a typical fan curve for a centrifugal fan with forward curved blades. It shows static pressure on the vertical axis plotted again flow rate on the horizontal axis.
