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Backward curved vanes vs. forward curved vanes in pumps
Power of a pump is related to discharge as follows:
Power = k1Q + (k2Q2 / tan A)
Where K1 and K2 are constants, Q is discharge and A is the angle between tangent of impeller at vane location and tangent to vane. For A less than 90o (forward curved vanes) it's unstable because of unrestricted power growth. Large losses result from high outflow velocity. The preferred configuration is achieved when A is more than 90o (which is backward curved vanes) since it has controlled power consumption and represents good fluid dynamic shape.
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