Considering the relative velocity of the mixture (water + sediment) passing through a certain area of the
impeller blade, a relative sliding distance (S) was estimated according to Eq.
to investigate the effect of the
impeller blade angle and its shape on regenerative pump performance.
In the stator frame as well, the pressure field attached to the rotating
impeller blade induces incoming flow field distortions [19].
Traditional centrifugal compressors with design capacities of 967kW (275 ton) and less also begin to suffer a degradation of full load efficiency due to the smaller
impeller blade spacing which increases the flow friction losses (Stoecker and Jones 1982).
Moreover, the geometry shape of
impeller blade has strong effect on pump performance, including vibrations.
Our attention is focused on the effects of impeller rotational speed, fluid rheology and
impeller blade curvature.
The velocity streamlines of the
impeller blade surface and the impeller inlet at 0.75[Q.sub.BEP] are shown in Figure 11.
The shroud has its inner contour shape in such a way to match the
impeller blade tip from the inlet to the exit of the impeller.
For example, based on the research analysis, product development incorporating an
impeller blade with an inwardly disposed bulge or bulge defined by d/d = T/D would establish propriety of the overall design that could maintain exclusivity on the market.
The distance from the surface of the liquid to the centreline of the impeller (submergence, S) was varied from the
impeller blade height to half of the total liquid depth (0.01 m < S < 0.12 m).