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Centrifugal Pumps pp 375–497Cite as

Design of the Hydraulic Components

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Abstract

As per the state of the art, the hydraulic design of the various types of impellers, diffusers, volutes and inlet casing is based on empirical methods such as described in this chapter. The first design created that way is then subject to analysis and optimization by CFD. Even then the accuracy of performance prediction is not always satisfactory. This, because the 3D-flow through the pump depends on the complex shapes of the flow paths given by the inlet casing, impeller and collector. To compound the issue, the interaction of the main flow with the flow in the impeller side rooms can have an unexpectedly large influence on the Q-H-curve and efficiency (an example can be found in chap. 9.1). Always remember that it is the combination of all parameters and shapes of the hydraulic channels which determines the flow patterns – hence performance. In order to reduce the uncertainties of performance prediction, a systematic approach to hydraulic design is advocated. To this end, chapter 7.14 introduces a novel concept for a fully analytical description of the impeller geometry. Prior to starting the hydraulic design all requirements the pump has to fulfill and the boundary conditions imposed should be thoroughly reviewed and documented (see “hydraulic specification” in Chap. 17).

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Notes

  1. 1.

    These impellers are sometimes called “Barske impeller s”, [5, 13, 43].

  2. 2.

    In order to plot the curves for nq=2 to nq=9 on the same graph, a logarithmic scale was chosen for the flow. The shape of the efficiency curves therefore looks unusual.

  3. 3.

    One could also formulate an equation d2=f(n) by inserting Eqs. (T7.3.1 and T7.3.2) into Eq. (T7.3.3). Further equations for ν=f(n) and NPSH=f(n, d2) could be derived to obtain three more complicated equations to determine the three quantities n, d2 and ν.

  4. 4.

    These approximation formulae originate from [B.1].

  5. 5.

    Figure 7.31 was derived from information provided in [B.22].

  6. 6.

    See also Sect. 3.10.3 for the effect of roughness on the pumping action of shrouds.

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  1. Villeneuve, Switzerland

    Dr. Ing. Johann Friedrich Gülich

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Gülich, J. (2014). Design of the Hydraulic Components. In: Centrifugal Pumps. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-40114-5_7

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  • DOI: https://doi.org/10.1007/978-3-642-40114-5_7

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