What is the difference in function between backward curved vanes and forward curved vanes in pumps?

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The 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 the tangent of impeller at vane location and the tangent to vane.


For A less than 90o (forward curved vanes) it is unstable owing to unrestricted power growth. Large losses result from high outflow velocity. The preferred configuration is achieved when A is more than 90o (i.e. backward curved vanes) because it has controlled power consumption and presents good fluid dynamic shape.

This question is taken from book named – A Self Learning Manual – Mastering Different Fields of Civil Engineering Works (VC-Q-A-Method) by Vincent T. H. CHU.

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  • marc February 12, 2017 at 11:08 pm

    hi my name is marc.

    I would like to inquire are there any journals out there that explain about pressure and velocity with regards to backward and straight guide vane designs.



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