"The Limitation of the One-Dimentional Fluid Flow Method for Calculation of the Manometric Head of the Centrifugal Pumps"

The non-uniformity factor is used for correction of the formulas obtained
from the one-dimentional fluid flow method in a centrifugal impeller pump.
The variations of radial velocity at the outlet of five centrifugal impellers
with the specific speed of about Ns =50 are calculated at design point by using two-dimentional potentional flow method for an invisid fluid.
On the other hand~ the variations of radial velocity across the outlet
width of the five impellers are measured at the design point by using triangular
probes.
The conclusion of these experiments and studies show that at design point
one can calculate~ with very good approximation~ the manometric head of an impeller by using the one-dimentional fluid flow method and the non-uniformity factor.
We also found that the distribution of the radial speed across the width of
the impeller outlet is quite different from what was previously hypothesized by
some authors and pump desginers.
To further this study we suggest to determine the non-uniformity factor for
the flow rates other than the design point and also for the pumps with different
specific speeds.